diff options
Diffstat (limited to 'target/linux/patches/4.7.9/patch-realtime')
| -rw-r--r-- | target/linux/patches/4.7.9/patch-realtime | 26640 |
1 files changed, 0 insertions, 26640 deletions
diff --git a/target/linux/patches/4.7.9/patch-realtime b/target/linux/patches/4.7.9/patch-realtime deleted file mode 100644 index 6fb397726..000000000 --- a/target/linux/patches/4.7.9/patch-realtime +++ /dev/null @@ -1,26640 +0,0 @@ -diff --git a/Documentation/hwlat_detector.txt b/Documentation/hwlat_detector.txt -new file mode 100644 -index 000000000000..cb61516483d3 ---- /dev/null -+++ b/Documentation/hwlat_detector.txt -@@ -0,0 +1,64 @@ -+Introduction: -+------------- -+ -+The module hwlat_detector is a special purpose kernel module that is used to -+detect large system latencies induced by the behavior of certain underlying -+hardware or firmware, independent of Linux itself. The code was developed -+originally to detect SMIs (System Management Interrupts) on x86 systems, -+however there is nothing x86 specific about this patchset. It was -+originally written for use by the "RT" patch since the Real Time -+kernel is highly latency sensitive. -+ -+SMIs are usually not serviced by the Linux kernel, which typically does not -+even know that they are occuring. SMIs are instead are set up by BIOS code -+and are serviced by BIOS code, usually for "critical" events such as -+management of thermal sensors and fans. Sometimes though, SMIs are used for -+other tasks and those tasks can spend an inordinate amount of time in the -+handler (sometimes measured in milliseconds). Obviously this is a problem if -+you are trying to keep event service latencies down in the microsecond range. -+ -+The hardware latency detector works by hogging all of the cpus for configurable -+amounts of time (by calling stop_machine()), polling the CPU Time Stamp Counter -+for some period, then looking for gaps in the TSC data. Any gap indicates a -+time when the polling was interrupted and since the machine is stopped and -+interrupts turned off the only thing that could do that would be an SMI. -+ -+Note that the SMI detector should *NEVER* be used in a production environment. -+It is intended to be run manually to determine if the hardware platform has a -+problem with long system firmware service routines. -+ -+Usage: -+------ -+ -+Loading the module hwlat_detector passing the parameter "enabled=1" (or by -+setting the "enable" entry in "hwlat_detector" debugfs toggled on) is the only -+step required to start the hwlat_detector. It is possible to redefine the -+threshold in microseconds (us) above which latency spikes will be taken -+into account (parameter "threshold="). -+ -+Example: -+ -+ # modprobe hwlat_detector enabled=1 threshold=100 -+ -+After the module is loaded, it creates a directory named "hwlat_detector" under -+the debugfs mountpoint, "/debug/hwlat_detector" for this text. It is necessary -+to have debugfs mounted, which might be on /sys/debug on your system. -+ -+The /debug/hwlat_detector interface contains the following files: -+ -+count - number of latency spikes observed since last reset -+enable - a global enable/disable toggle (0/1), resets count -+max - maximum hardware latency actually observed (usecs) -+sample - a pipe from which to read current raw sample data -+ in the format <timestamp> <latency observed usecs> -+ (can be opened O_NONBLOCK for a single sample) -+threshold - minimum latency value to be considered (usecs) -+width - time period to sample with CPUs held (usecs) -+ must be less than the total window size (enforced) -+window - total period of sampling, width being inside (usecs) -+ -+By default we will set width to 500,000 and window to 1,000,000, meaning that -+we will sample every 1,000,000 usecs (1s) for 500,000 usecs (0.5s). If we -+observe any latencies that exceed the threshold (initially 100 usecs), -+then we write to a global sample ring buffer of 8K samples, which is -+consumed by reading from the "sample" (pipe) debugfs file interface. -diff --git a/Documentation/sysrq.txt b/Documentation/sysrq.txt -index 13f5619b2203..f64d075ba647 100644 ---- a/Documentation/sysrq.txt -+++ b/Documentation/sysrq.txt -@@ -59,10 +59,17 @@ On PowerPC - Press 'ALT - Print Screen (or F13) - <command key>, - On other - If you know of the key combos for other architectures, please - let me know so I can add them to this section. - --On all - write a character to /proc/sysrq-trigger. e.g.: -- -+On all - write a character to /proc/sysrq-trigger, e.g.: - echo t > /proc/sysrq-trigger - -+On all - Enable network SysRq by writing a cookie to icmp_echo_sysrq, e.g. -+ echo 0x01020304 >/proc/sys/net/ipv4/icmp_echo_sysrq -+ Send an ICMP echo request with this pattern plus the particular -+ SysRq command key. Example: -+ # ping -c1 -s57 -p0102030468 -+ will trigger the SysRq-H (help) command. -+ -+ - * What are the 'command' keys? - ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - 'b' - Will immediately reboot the system without syncing or unmounting -diff --git a/Documentation/trace/histograms.txt b/Documentation/trace/histograms.txt -new file mode 100644 -index 000000000000..6f2aeabf7faa ---- /dev/null -+++ b/Documentation/trace/histograms.txt -@@ -0,0 +1,186 @@ -+ Using the Linux Kernel Latency Histograms -+ -+ -+This document gives a short explanation how to enable, configure and use -+latency histograms. Latency histograms are primarily relevant in the -+context of real-time enabled kernels (CONFIG_PREEMPT/CONFIG_PREEMPT_RT) -+and are used in the quality management of the Linux real-time -+capabilities. -+ -+ -+* Purpose of latency histograms -+ -+A latency histogram continuously accumulates the frequencies of latency -+data. There are two types of histograms -+- potential sources of latencies -+- effective latencies -+ -+ -+* Potential sources of latencies -+ -+Potential sources of latencies are code segments where interrupts, -+preemption or both are disabled (aka critical sections). To create -+histograms of potential sources of latency, the kernel stores the time -+stamp at the start of a critical section, determines the time elapsed -+when the end of the section is reached, and increments the frequency -+counter of that latency value - irrespective of whether any concurrently -+running process is affected by latency or not. -+- Configuration items (in the Kernel hacking/Tracers submenu) -+ CONFIG_INTERRUPT_OFF_LATENCY -+ CONFIG_PREEMPT_OFF_LATENCY -+ -+ -+* Effective latencies -+ -+Effective latencies are actually occuring during wakeup of a process. To -+determine effective latencies, the kernel stores the time stamp when a -+process is scheduled to be woken up, and determines the duration of the -+wakeup time shortly before control is passed over to this process. Note -+that the apparent latency in user space may be somewhat longer, since the -+process may be interrupted after control is passed over to it but before -+the execution in user space takes place. Simply measuring the interval -+between enqueuing and wakeup may also not appropriate in cases when a -+process is scheduled as a result of a timer expiration. The timer may have -+missed its deadline, e.g. due to disabled interrupts, but this latency -+would not be registered. Therefore, the offsets of missed timers are -+recorded in a separate histogram. If both wakeup latency and missed timer -+offsets are configured and enabled, a third histogram may be enabled that -+records the overall latency as a sum of the timer latency, if any, and the -+wakeup latency. This histogram is called "timerandwakeup". -+- Configuration items (in the Kernel hacking/Tracers submenu) -+ CONFIG_WAKEUP_LATENCY -+ CONFIG_MISSED_TIMER_OFSETS -+ -+ -+* Usage -+ -+The interface to the administration of the latency histograms is located -+in the debugfs file system. To mount it, either enter -+ -+mount -t sysfs nodev /sys -+mount -t debugfs nodev /sys/kernel/debug -+ -+from shell command line level, or add -+ -+nodev /sys sysfs defaults 0 0 -+nodev /sys/kernel/debug debugfs defaults 0 0 -+ -+to the file /etc/fstab. All latency histogram related files are then -+available in the directory /sys/kernel/debug/tracing/latency_hist. A -+particular histogram type is enabled by writing non-zero to the related -+variable in the /sys/kernel/debug/tracing/latency_hist/enable directory. -+Select "preemptirqsoff" for the histograms of potential sources of -+latencies and "wakeup" for histograms of effective latencies etc. The -+histogram data - one per CPU - are available in the files -+ -+/sys/kernel/debug/tracing/latency_hist/preemptoff/CPUx -+/sys/kernel/debug/tracing/latency_hist/irqsoff/CPUx -+/sys/kernel/debug/tracing/latency_hist/preemptirqsoff/CPUx -+/sys/kernel/debug/tracing/latency_hist/wakeup/CPUx -+/sys/kernel/debug/tracing/latency_hist/wakeup/sharedprio/CPUx -+/sys/kernel/debug/tracing/latency_hist/missed_timer_offsets/CPUx -+/sys/kernel/debug/tracing/latency_hist/timerandwakeup/CPUx -+ -+The histograms are reset by writing non-zero to the file "reset" in a -+particular latency directory. To reset all latency data, use -+ -+#!/bin/sh -+ -+TRACINGDIR=/sys/kernel/debug/tracing -+HISTDIR=$TRACINGDIR/latency_hist -+ -+if test -d $HISTDIR -+then -+ cd $HISTDIR -+ for i in `find . | grep /reset$` -+ do -+ echo 1 >$i -+ done -+fi -+ -+ -+* Data format -+ -+Latency data are stored with a resolution of one microsecond. The -+maximum latency is 10,240 microseconds. The data are only valid, if the -+overflow register is empty. Every output line contains the latency in -+microseconds in the first row and the number of samples in the second -+row. To display only lines with a positive latency count, use, for -+example, -+ -+grep -v " 0$" /sys/kernel/debug/tracing/latency_hist/preemptoff/CPU0 -+ -+#Minimum latency: 0 microseconds. -+#Average latency: 0 microseconds. -+#Maximum latency: 25 microseconds. -+#Total samples: 3104770694 -+#There are 0 samples greater or equal than 10240 microseconds -+#usecs samples -+ 0 2984486876 -+ 1 49843506 -+ 2 58219047 -+ 3 5348126 -+ 4 2187960 -+ 5 3388262 -+ 6 959289 -+ 7 208294 -+ 8 40420 -+ 9 4485 -+ 10 14918 -+ 11 18340 -+ 12 25052 -+ 13 19455 -+ 14 5602 -+ 15 969 -+ 16 47 -+ 17 18 -+ 18 14 -+ 19 1 -+ 20 3 -+ 21 2 -+ 22 5 -+ 23 2 -+ 25 1 -+ -+ -+* Wakeup latency of a selected process -+ -+To only collect wakeup latency data of a particular process, write the -+PID of the requested process to -+ -+/sys/kernel/debug/tracing/latency_hist/wakeup/pid -+ -+PIDs are not considered, if this variable is set to 0. -+ -+ -+* Details of the process with the highest wakeup latency so far -+ -+Selected data of the process that suffered from the highest wakeup -+latency that occurred in a particular CPU are available in the file -+ -+/sys/kernel/debug/tracing/latency_hist/wakeup/max_latency-CPUx. -+ -+In addition, other relevant system data at the time when the -+latency occurred are given. -+ -+The format of the data is (all in one line): -+<PID> <Priority> <Latency> (<Timeroffset>) <Command> \ -+<- <PID> <Priority> <Command> <Timestamp> -+ -+The value of <Timeroffset> is only relevant in the combined timer -+and wakeup latency recording. In the wakeup recording, it is -+always 0, in the missed_timer_offsets recording, it is the same -+as <Latency>. -+ -+When retrospectively searching for the origin of a latency and -+tracing was not enabled, it may be helpful to know the name and -+some basic data of the task that (finally) was switching to the -+late real-tlme task. In addition to the victim's data, also the -+data of the possible culprit are therefore displayed after the -+"<-" symbol. -+ -+Finally, the timestamp of the time when the latency occurred -+in <seconds>.<microseconds> after the most recent system boot -+is provided. -+ -+These data are also reset when the wakeup histogram is reset. -diff --git a/arch/Kconfig b/arch/Kconfig -index 81869a5e7e17..54cfbcbdaa02 100644 ---- a/arch/Kconfig -+++ b/arch/Kconfig -@@ -9,6 +9,7 @@ config OPROFILE - tristate "OProfile system profiling" - depends on PROFILING - depends on HAVE_OPROFILE -+ depends on !PREEMPT_RT_FULL - select RING_BUFFER - select RING_BUFFER_ALLOW_SWAP - help -@@ -52,6 +53,7 @@ config KPROBES - config JUMP_LABEL - bool "Optimize very unlikely/likely branches" - depends on HAVE_ARCH_JUMP_LABEL -+ depends on (!INTERRUPT_OFF_HIST && !PREEMPT_OFF_HIST && !WAKEUP_LATENCY_HIST && !MISSED_TIMER_OFFSETS_HIST) - help - This option enables a transparent branch optimization that - makes certain almost-always-true or almost-always-false branch -diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig -index cdfa6c2b7626..fa885f5eb8c9 100644 ---- a/arch/arm/Kconfig -+++ b/arch/arm/Kconfig -@@ -35,7 +35,7 @@ config ARM - select HARDIRQS_SW_RESEND - select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT) - select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6 -- select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU -+ select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU && !PREEMPT_RT_BASE - select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU - select HAVE_ARCH_MMAP_RND_BITS if MMU - select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT) -@@ -71,6 +71,7 @@ config ARM - select HAVE_PERF_EVENTS - select HAVE_PERF_REGS - select HAVE_PERF_USER_STACK_DUMP -+ select HAVE_PREEMPT_LAZY - select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE) - select HAVE_REGS_AND_STACK_ACCESS_API - select HAVE_SYSCALL_TRACEPOINTS -diff --git a/arch/arm/include/asm/switch_to.h b/arch/arm/include/asm/switch_to.h -index 12ebfcc1d539..c962084605bc 100644 ---- a/arch/arm/include/asm/switch_to.h -+++ b/arch/arm/include/asm/switch_to.h -@@ -3,6 +3,13 @@ - - #include <linux/thread_info.h> - -+#if defined CONFIG_PREEMPT_RT_FULL && defined CONFIG_HIGHMEM -+void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p); -+#else -+static inline void -+switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p) { } -+#endif -+ - /* - * For v7 SMP cores running a preemptible kernel we may be pre-empted - * during a TLB maintenance operation, so execute an inner-shareable dsb -@@ -25,6 +32,7 @@ extern struct task_struct *__switch_to(struct task_struct *, struct thread_info - #define switch_to(prev,next,last) \ - do { \ - __complete_pending_tlbi(); \ -+ switch_kmaps(prev, next); \ - last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \ - } while (0) - -diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h -index 776757d1604a..1f36a4eccc72 100644 ---- a/arch/arm/include/asm/thread_info.h -+++ b/arch/arm/include/asm/thread_info.h -@@ -49,6 +49,7 @@ struct cpu_context_save { - struct thread_info { - unsigned long flags; /* low level flags */ - int preempt_count; /* 0 => preemptable, <0 => bug */ -+ int preempt_lazy_count; /* 0 => preemptable, <0 => bug */ - mm_segment_t addr_limit; /* address limit */ - struct task_struct *task; /* main task structure */ - __u32 cpu; /* cpu */ -@@ -142,7 +143,8 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *, - #define TIF_SYSCALL_TRACE 4 /* syscall trace active */ - #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ - #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ --#define TIF_SECCOMP 7 /* seccomp syscall filtering active */ -+#define TIF_SECCOMP 8 /* seccomp syscall filtering active */ -+#define TIF_NEED_RESCHED_LAZY 7 - - #define TIF_NOHZ 12 /* in adaptive nohz mode */ - #define TIF_USING_IWMMXT 17 -@@ -152,6 +154,7 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *, - #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) - #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) - #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) -+#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY) - #define _TIF_UPROBE (1 << TIF_UPROBE) - #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) - #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) -@@ -167,7 +170,8 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *, - * Change these and you break ASM code in entry-common.S - */ - #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ -- _TIF_NOTIFY_RESUME | _TIF_UPROBE) -+ _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ -+ _TIF_NEED_RESCHED_LAZY) - - #endif /* __KERNEL__ */ - #endif /* __ASM_ARM_THREAD_INFO_H */ -diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c -index 27d05813ff09..5a3742215cde 100644 ---- a/arch/arm/kernel/asm-offsets.c -+++ b/arch/arm/kernel/asm-offsets.c -@@ -65,6 +65,7 @@ int main(void) - BLANK(); - DEFINE(TI_FLAGS, offsetof(struct thread_info, flags)); - DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count)); -+ DEFINE(TI_PREEMPT_LAZY, offsetof(struct thread_info, preempt_lazy_count)); - DEFINE(TI_ADDR_LIMIT, offsetof(struct thread_info, addr_limit)); - DEFINE(TI_TASK, offsetof(struct thread_info, task)); - DEFINE(TI_CPU, offsetof(struct thread_info, cpu)); -diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S -index e2550500486d..3125de9e9783 100644 ---- a/arch/arm/kernel/entry-armv.S -+++ b/arch/arm/kernel/entry-armv.S -@@ -215,11 +215,18 @@ ENDPROC(__dabt_svc) - #ifdef CONFIG_PREEMPT - get_thread_info tsk - ldr r8, [tsk, #TI_PREEMPT] @ get preempt count -- ldr r0, [tsk, #TI_FLAGS] @ get flags - teq r8, #0 @ if preempt count != 0 -+ bne 1f @ return from exeption -+ ldr r0, [tsk, #TI_FLAGS] @ get flags -+ tst r0, #_TIF_NEED_RESCHED @ if NEED_RESCHED is set -+ blne svc_preempt @ preempt! -+ -+ ldr r8, [tsk, #TI_PREEMPT_LAZY] @ get preempt lazy count -+ teq r8, #0 @ if preempt lazy count != 0 - movne r0, #0 @ force flags to 0 -- tst r0, #_TIF_NEED_RESCHED -+ tst r0, #_TIF_NEED_RESCHED_LAZY - blne svc_preempt -+1: - #endif - - svc_exit r5, irq = 1 @ return from exception -@@ -234,8 +241,14 @@ ENDPROC(__irq_svc) - 1: bl preempt_schedule_irq @ irq en/disable is done inside - ldr r0, [tsk, #TI_FLAGS] @ get new tasks TI_FLAGS - tst r0, #_TIF_NEED_RESCHED -+ bne 1b -+ tst r0, #_TIF_NEED_RESCHED_LAZY - reteq r8 @ go again -- b 1b -+ ldr r0, [tsk, #TI_PREEMPT_LAZY] @ get preempt lazy count -+ teq r0, #0 @ if preempt lazy count != 0 -+ beq 1b -+ ret r8 @ go again -+ - #endif - - __und_fault: -diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S -index 30a7228eaceb..c3bd6cbfce4b 100644 ---- a/arch/arm/kernel/entry-common.S -+++ b/arch/arm/kernel/entry-common.S -@@ -36,7 +36,9 @@ - UNWIND(.cantunwind ) - disable_irq_notrace @ disable interrupts - ldr r1, [tsk, #TI_FLAGS] @ re-check for syscall tracing -- tst r1, #_TIF_SYSCALL_WORK | _TIF_WORK_MASK -+ tst r1, #((_TIF_SYSCALL_WORK | _TIF_WORK_MASK) & ~_TIF_SECCOMP) -+ bne fast_work_pending -+ tst r1, #_TIF_SECCOMP - bne fast_work_pending - - /* perform architecture specific actions before user return */ -@@ -62,8 +64,11 @@ ENDPROC(ret_fast_syscall) - str r0, [sp, #S_R0 + S_OFF]! @ save returned r0 - disable_irq_notrace @ disable interrupts - ldr r1, [tsk, #TI_FLAGS] @ re-check for syscall tracing -- tst r1, #_TIF_SYSCALL_WORK | _TIF_WORK_MASK -+ tst r1, #((_TIF_SYSCALL_WORK | _TIF_WORK_MASK) & ~_TIF_SECCOMP) -+ bne do_slower_path -+ tst r1, #_TIF_SECCOMP - beq no_work_pending -+do_slower_path: - UNWIND(.fnend ) - ENDPROC(ret_fast_syscall) - -diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c -index 4adfb46e3ee9..15f1d94b47c5 100644 ---- a/arch/arm/kernel/process.c -+++ b/arch/arm/kernel/process.c -@@ -319,6 +319,30 @@ unsigned long arch_randomize_brk(struct mm_struct *mm) - } - - #ifdef CONFIG_MMU -+/* -+ * CONFIG_SPLIT_PTLOCK_CPUS results in a page->ptl lock. If the lock is not -+ * initialized by pgtable_page_ctor() then a coredump of the vector page will -+ * fail. -+ */ -+static int __init vectors_user_mapping_init_page(void) -+{ -+ struct page *page; -+ unsigned long addr = 0xffff0000; -+ pgd_t *pgd; -+ pud_t *pud; -+ pmd_t *pmd; -+ -+ pgd = pgd_offset_k(addr); -+ pud = pud_offset(pgd, addr); -+ pmd = pmd_offset(pud, addr); -+ page = pmd_page(*(pmd)); -+ -+ pgtable_page_ctor(page); -+ -+ return 0; -+} -+late_initcall(vectors_user_mapping_init_page); -+ - #ifdef CONFIG_KUSER_HELPERS - /* - * The vectors page is always readable from user space for the -diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c -index 7b8f2141427b..96541e00b74a 100644 ---- a/arch/arm/kernel/signal.c -+++ b/arch/arm/kernel/signal.c -@@ -572,7 +572,8 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall) - */ - trace_hardirqs_off(); - do { -- if (likely(thread_flags & _TIF_NEED_RESCHED)) { -+ if (likely(thread_flags & (_TIF_NEED_RESCHED | -+ _TIF_NEED_RESCHED_LAZY))) { - schedule(); - } else { - if (unlikely(!user_mode(regs))) -diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c -index baee70267f29..ad157ec494f9 100644 ---- a/arch/arm/kernel/smp.c -+++ b/arch/arm/kernel/smp.c -@@ -234,8 +234,6 @@ int __cpu_disable(void) - flush_cache_louis(); - local_flush_tlb_all(); - -- clear_tasks_mm_cpumask(cpu); -- - return 0; - } - -@@ -251,6 +249,9 @@ void __cpu_die(unsigned int cpu) - pr_err("CPU%u: cpu didn't die\n", cpu); - return; - } -+ -+ clear_tasks_mm_cpumask(cpu); -+ - pr_notice("CPU%u: shutdown\n", cpu); - - /* -diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c -index 0bee233fef9a..314cfb232a63 100644 ---- a/arch/arm/kernel/unwind.c -+++ b/arch/arm/kernel/unwind.c -@@ -93,7 +93,7 @@ extern const struct unwind_idx __start_unwind_idx[]; - static const struct unwind_idx *__origin_unwind_idx; - extern const struct unwind_idx __stop_unwind_idx[]; - --static DEFINE_SPINLOCK(unwind_lock); -+static DEFINE_RAW_SPINLOCK(unwind_lock); - static LIST_HEAD(unwind_tables); - - /* Convert a prel31 symbol to an absolute address */ -@@ -201,7 +201,7 @@ static const struct unwind_idx *unwind_find_idx(unsigned long addr) - /* module unwind tables */ - struct unwind_table *table; - -- spin_lock_irqsave(&unwind_lock, flags); -+ raw_spin_lock_irqsave(&unwind_lock, flags); - list_for_each_entry(table, &unwind_tables, list) { - if (addr >= table->begin_addr && - addr < table->end_addr) { -@@ -213,7 +213,7 @@ static const struct unwind_idx *unwind_find_idx(unsigned long addr) - break; - } - } -- spin_unlock_irqrestore(&unwind_lock, flags); -+ raw_spin_unlock_irqrestore(&unwind_lock, flags); - } - - pr_debug("%s: idx = %p\n", __func__, idx); -@@ -529,9 +529,9 @@ struct unwind_table *unwind_table_add(unsigned long start, unsigned long size, - tab->begin_addr = text_addr; - tab->end_addr = text_addr + text_size; - -- spin_lock_irqsave(&unwind_lock, flags); -+ raw_spin_lock_irqsave(&unwind_lock, flags); - list_add_tail(&tab->list, &unwind_tables); -- spin_unlock_irqrestore(&unwind_lock, flags); -+ raw_spin_unlock_irqrestore(&unwind_lock, flags); - - return tab; - } -@@ -543,9 +543,9 @@ void unwind_table_del(struct unwind_table *tab) - if (!tab) - return; - -- spin_lock_irqsave(&unwind_lock, flags); -+ raw_spin_lock_irqsave(&unwind_lock, flags); - list_del(&tab->list); -- spin_unlock_irqrestore(&unwind_lock, flags); -+ raw_spin_unlock_irqrestore(&unwind_lock, flags); - - kfree(tab); - } -diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c -index 72b11d91ede2..34068c59d0c5 100644 ---- a/arch/arm/kvm/arm.c -+++ b/arch/arm/kvm/arm.c -@@ -582,7 +582,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) - * involves poking the GIC, which must be done in a - * non-preemptible context. - */ -- preempt_disable(); -+ migrate_disable(); - kvm_pmu_flush_hwstate(vcpu); - kvm_timer_flush_hwstate(vcpu); - kvm_vgic_flush_hwstate(vcpu); -@@ -603,7 +603,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) - kvm_pmu_sync_hwstate(vcpu); - kvm_timer_sync_hwstate(vcpu); - kvm_vgic_sync_hwstate(vcpu); -- preempt_enable(); -+ migrate_enable(); - continue; - } - -@@ -659,7 +659,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) - - kvm_vgic_sync_hwstate(vcpu); - -- preempt_enable(); -+ migrate_enable(); - - ret = handle_exit(vcpu, run, ret); - } -diff --git a/arch/arm/mach-exynos/platsmp.c b/arch/arm/mach-exynos/platsmp.c -index 85c3be63d644..8a950aec7834 100644 ---- a/arch/arm/mach-exynos/platsmp.c -+++ b/arch/arm/mach-exynos/platsmp.c -@@ -229,7 +229,7 @@ static void __iomem *scu_base_addr(void) - return (void __iomem *)(S5P_VA_SCU); - } - --static DEFINE_SPINLOCK(boot_lock); -+static DEFINE_RAW_SPINLOCK(boot_lock); - - static void exynos_secondary_init(unsigned int cpu) - { -@@ -242,8 +242,8 @@ static void exynos_secondary_init(unsigned int cpu) - /* - * Synchronise with the boot thread. - */ -- spin_lock(&boot_lock); -- spin_unlock(&boot_lock); -+ raw_spin_lock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - } - - int exynos_set_boot_addr(u32 core_id, unsigned long boot_addr) -@@ -307,7 +307,7 @@ static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle) - * Set synchronisation state between this boot processor - * and the secondary one - */ -- spin_lock(&boot_lock); -+ raw_spin_lock(&boot_lock); - - /* - * The secondary processor is waiting to be released from -@@ -334,7 +334,7 @@ static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle) - - if (timeout == 0) { - printk(KERN_ERR "cpu1 power enable failed"); -- spin_unlock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - return -ETIMEDOUT; - } - } -@@ -380,7 +380,7 @@ static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle) - * calibrations, then wait for it to finish - */ - fail: -- spin_unlock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - - return pen_release != -1 ? ret : 0; - } -diff --git a/arch/arm/mach-hisi/platmcpm.c b/arch/arm/mach-hisi/platmcpm.c -index 4b653a8cb75c..b03d5a922cb1 100644 ---- a/arch/arm/mach-hisi/platmcpm.c -+++ b/arch/arm/mach-hisi/platmcpm.c -@@ -61,7 +61,7 @@ - - static void __iomem *sysctrl, *fabric; - static int hip04_cpu_table[HIP04_MAX_CLUSTERS][HIP04_MAX_CPUS_PER_CLUSTER]; --static DEFINE_SPINLOCK(boot_lock); -+static DEFINE_RAW_SPINLOCK(boot_lock); - static u32 fabric_phys_addr; - /* - * [0]: bootwrapper physical address -@@ -113,7 +113,7 @@ static int hip04_boot_secondary(unsigned int l_cpu, struct task_struct *idle) - if (cluster >= HIP04_MAX_CLUSTERS || cpu >= HIP04_MAX_CPUS_PER_CLUSTER) - return -EINVAL; - -- spin_lock_irq(&boot_lock); -+ raw_spin_lock_irq(&boot_lock); - - if (hip04_cpu_table[cluster][cpu]) - goto out; -@@ -147,7 +147,7 @@ static int hip04_boot_secondary(unsigned int l_cpu, struct task_struct *idle) - - out: - hip04_cpu_table[cluster][cpu]++; -- spin_unlock_irq(&boot_lock); -+ raw_spin_unlock_irq(&boot_lock); - - return 0; - } -@@ -162,11 +162,11 @@ static void hip04_cpu_die(unsigned int l_cpu) - cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); - cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); - -- spin_lock(&boot_lock); -+ raw_spin_lock(&boot_lock); - hip04_cpu_table[cluster][cpu]--; - if (hip04_cpu_table[cluster][cpu] == 1) { - /* A power_up request went ahead of us. */ -- spin_unlock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - return; - } else if (hip04_cpu_table[cluster][cpu] > 1) { - pr_err("Cluster %d CPU%d boots multiple times\n", cluster, cpu); -@@ -174,7 +174,7 @@ static void hip04_cpu_die(unsigned int l_cpu) - } - - last_man = hip04_cluster_is_down(cluster); -- spin_unlock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - if (last_man) { - /* Since it's Cortex A15, disable L2 prefetching. */ - asm volatile( -@@ -203,7 +203,7 @@ static int hip04_cpu_kill(unsigned int l_cpu) - cpu >= HIP04_MAX_CPUS_PER_CLUSTER); - - count = TIMEOUT_MSEC / POLL_MSEC; -- spin_lock_irq(&boot_lock); -+ raw_spin_lock_irq(&boot_lock); - for (tries = 0; tries < count; tries++) { - if (hip04_cpu_table[cluster][cpu]) - goto err; -@@ -211,10 +211,10 @@ static int hip04_cpu_kill(unsigned int l_cpu) - data = readl_relaxed(sysctrl + SC_CPU_RESET_STATUS(cluster)); - if (data & CORE_WFI_STATUS(cpu)) - break; -- spin_unlock_irq(&boot_lock); -+ raw_spin_unlock_irq(&boot_lock); - /* Wait for clean L2 when the whole cluster is down. */ - msleep(POLL_MSEC); -- spin_lock_irq(&boot_lock); -+ raw_spin_lock_irq(&boot_lock); - } - if (tries >= count) - goto err; -@@ -231,10 +231,10 @@ static int hip04_cpu_kill(unsigned int l_cpu) - goto err; - if (hip04_cluster_is_down(cluster)) - hip04_set_snoop_filter(cluster, 0); -- spin_unlock_irq(&boot_lock); -+ raw_spin_unlock_irq(&boot_lock); - return 1; - err: -- spin_unlock_irq(&boot_lock); -+ raw_spin_unlock_irq(&boot_lock); - return 0; - } - #endif -diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig -index 8973fae25436..dd905b9602a0 100644 ---- a/arch/arm/mach-imx/Kconfig -+++ b/arch/arm/mach-imx/Kconfig -@@ -526,7 +526,7 @@ config SOC_IMX6Q - bool "i.MX6 Quad/DualLite support" - select ARM_ERRATA_764369 if SMP - select HAVE_ARM_SCU if SMP -- select HAVE_ARM_TWD if SMP -+ select HAVE_ARM_TWD - select PCI_DOMAINS if PCI - select PINCTRL_IMX6Q - select SOC_IMX6 -diff --git a/arch/arm/mach-omap2/omap-smp.c b/arch/arm/mach-omap2/omap-smp.c -index c625cc10d9f9..6cbad704cc3d 100644 ---- a/arch/arm/mach-omap2/omap-smp.c -+++ b/arch/arm/mach-omap2/omap-smp.c -@@ -43,7 +43,7 @@ - /* SCU base address */ - static void __iomem *scu_base; - --static DEFINE_SPINLOCK(boot_lock); -+static DEFINE_RAW_SPINLOCK(boot_lock); - - void __iomem *omap4_get_scu_base(void) - { -@@ -74,8 +74,8 @@ static void omap4_secondary_init(unsigned int cpu) - /* - * Synchronise with the boot thread. - */ -- spin_lock(&boot_lock); -- spin_unlock(&boot_lock); -+ raw_spin_lock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - } - - static int omap4_boot_secondary(unsigned int cpu, struct task_struct *idle) -@@ -89,7 +89,7 @@ static int omap4_boot_secondary(unsigned int cpu, struct task_struct *idle) - * Set synchronisation state between this boot processor - * and the secondary one - */ -- spin_lock(&boot_lock); -+ raw_spin_lock(&boot_lock); - - /* - * Update the AuxCoreBoot0 with boot state for secondary core. -@@ -166,7 +166,7 @@ static int omap4_boot_secondary(unsigned int cpu, struct task_struct *idle) - * Now the secondary core is starting up let it run its - * calibrations, then wait for it to finish - */ -- spin_unlock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - - return 0; - } -diff --git a/arch/arm/mach-prima2/platsmp.c b/arch/arm/mach-prima2/platsmp.c -index 0875b99add18..18b6d98d2581 100644 ---- a/arch/arm/mach-prima2/platsmp.c -+++ b/arch/arm/mach-prima2/platsmp.c -@@ -22,7 +22,7 @@ - - static void __iomem *clk_base; - --static DEFINE_SPINLOCK(boot_lock); -+static DEFINE_RAW_SPINLOCK(boot_lock); - - static void sirfsoc_secondary_init(unsigned int cpu) - { -@@ -36,8 +36,8 @@ static void sirfsoc_secondary_init(unsigned int cpu) - /* - * Synchronise with the boot thread. - */ -- spin_lock(&boot_lock); -- spin_unlock(&boot_lock); -+ raw_spin_lock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - } - - static const struct of_device_id clk_ids[] = { -@@ -75,7 +75,7 @@ static int sirfsoc_boot_secondary(unsigned int cpu, struct task_struct *idle) - /* make sure write buffer is drained */ - mb(); - -- spin_lock(&boot_lock); -+ raw_spin_lock(&boot_lock); - - /* - * The secondary processor is waiting to be released from -@@ -107,7 +107,7 @@ static int sirfsoc_boot_secondary(unsigned int cpu, struct task_struct *idle) - * now the secondary core is starting up let it run its - * calibrations, then wait for it to finish - */ -- spin_unlock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - - return pen_release != -1 ? -ENOSYS : 0; - } -diff --git a/arch/arm/mach-qcom/platsmp.c b/arch/arm/mach-qcom/platsmp.c -index 5494c9e0c909..e8ce157d3548 100644 ---- a/arch/arm/mach-qcom/platsmp.c -+++ b/arch/arm/mach-qcom/platsmp.c -@@ -46,7 +46,7 @@ - - extern void secondary_startup_arm(void); - --static DEFINE_SPINLOCK(boot_lock); -+static DEFINE_RAW_SPINLOCK(boot_lock); - - #ifdef CONFIG_HOTPLUG_CPU - static void qcom_cpu_die(unsigned int cpu) -@@ -60,8 +60,8 @@ static void qcom_secondary_init(unsigned int cpu) - /* - * Synchronise with the boot thread. - */ -- spin_lock(&boot_lock); -- spin_unlock(&boot_lock); -+ raw_spin_lock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - } - - static int scss_release_secondary(unsigned int cpu) -@@ -284,7 +284,7 @@ static int qcom_boot_secondary(unsigned int cpu, int (*func)(unsigned int)) - * set synchronisation state between this boot processor - * and the secondary one - */ -- spin_lock(&boot_lock); -+ raw_spin_lock(&boot_lock); - - /* - * Send the secondary CPU a soft interrupt, thereby causing -@@ -297,7 +297,7 @@ static int qcom_boot_secondary(unsigned int cpu, int (*func)(unsigned int)) - * now the secondary core is starting up let it run its - * calibrations, then wait for it to finish - */ -- spin_unlock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - - return ret; - } -diff --git a/arch/arm/mach-spear/platsmp.c b/arch/arm/mach-spear/platsmp.c -index 8d1e2d551786..7fa56cc78118 100644 ---- a/arch/arm/mach-spear/platsmp.c -+++ b/arch/arm/mach-spear/platsmp.c -@@ -32,7 +32,7 @@ static void write_pen_release(int val) - sync_cache_w(&pen_release); - } - --static DEFINE_SPINLOCK(boot_lock); -+static DEFINE_RAW_SPINLOCK(boot_lock); - - static void __iomem *scu_base = IOMEM(VA_SCU_BASE); - -@@ -47,8 +47,8 @@ static void spear13xx_secondary_init(unsigned int cpu) - /* - * Synchronise with the boot thread. - */ -- spin_lock(&boot_lock); -- spin_unlock(&boot_lock); -+ raw_spin_lock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - } - - static int spear13xx_boot_secondary(unsigned int cpu, struct task_struct *idle) -@@ -59,7 +59,7 @@ static int spear13xx_boot_secondary(unsigned int cpu, struct task_struct *idle) - * set synchronisation state between this boot processor - * and the secondary one - */ -- spin_lock(&boot_lock); -+ raw_spin_lock(&boot_lock); - - /* - * The secondary processor is waiting to be released from -@@ -84,7 +84,7 @@ static int spear13xx_boot_secondary(unsigned int cpu, struct task_struct *idle) - * now the secondary core is starting up let it run its - * calibrations, then wait for it to finish - */ -- spin_unlock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - - return pen_release != -1 ? -ENOSYS : 0; - } -diff --git a/arch/arm/mach-sti/platsmp.c b/arch/arm/mach-sti/platsmp.c -index ea5a2277ee46..b988e081ac79 100644 ---- a/arch/arm/mach-sti/platsmp.c -+++ b/arch/arm/mach-sti/platsmp.c -@@ -35,7 +35,7 @@ static void write_pen_release(int val) - sync_cache_w(&pen_release); - } - --static DEFINE_SPINLOCK(boot_lock); -+static DEFINE_RAW_SPINLOCK(boot_lock); - - static void sti_secondary_init(unsigned int cpu) - { -@@ -48,8 +48,8 @@ static void sti_secondary_init(unsigned int cpu) - /* - * Synchronise with the boot thread. - */ -- spin_lock(&boot_lock); -- spin_unlock(&boot_lock); -+ raw_spin_lock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - } - - static int sti_boot_secondary(unsigned int cpu, struct task_struct *idle) -@@ -60,7 +60,7 @@ static int sti_boot_secondary(unsigned int cpu, struct task_struct *idle) - * set synchronisation state between this boot processor - * and the secondary one - */ -- spin_lock(&boot_lock); -+ raw_spin_lock(&boot_lock); - - /* - * The secondary processor is waiting to be released from -@@ -91,7 +91,7 @@ static int sti_boot_secondary(unsigned int cpu, struct task_struct *idle) - * now the secondary core is starting up let it run its - * calibrations, then wait for it to finish - */ -- spin_unlock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - - return pen_release != -1 ? -ENOSYS : 0; - } -diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c -index ad5841856007..7678f0616a0a 100644 ---- a/arch/arm/mm/fault.c -+++ b/arch/arm/mm/fault.c -@@ -430,6 +430,9 @@ do_translation_fault(unsigned long addr, unsigned int fsr, - if (addr < TASK_SIZE) - return do_page_fault(addr, fsr, regs); - -+ if (interrupts_enabled(regs)) -+ local_irq_enable(); -+ - if (user_mode(regs)) - goto bad_area; - -@@ -497,6 +500,9 @@ do_translation_fault(unsigned long addr, unsigned int fsr, - static int - do_sect_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) - { -+ if (interrupts_enabled(regs)) -+ local_irq_enable(); -+ - do_bad_area(addr, fsr, regs); - return 0; - } -diff --git a/arch/arm/mm/highmem.c b/arch/arm/mm/highmem.c -index d02f8187b1cc..542692dbd40a 100644 ---- a/arch/arm/mm/highmem.c -+++ b/arch/arm/mm/highmem.c -@@ -34,6 +34,11 @@ static inline pte_t get_fixmap_pte(unsigned long vaddr) - return *ptep; - } - -+static unsigned int fixmap_idx(int type) -+{ -+ return FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id(); -+} -+ - void *kmap(struct page *page) - { - might_sleep(); -@@ -54,12 +59,13 @@ EXPORT_SYMBOL(kunmap); - - void *kmap_atomic(struct page *page) - { -+ pte_t pte = mk_pte(page, kmap_prot); - unsigned int idx; - unsigned long vaddr; - void *kmap; - int type; - -- preempt_disable(); -+ preempt_disable_nort(); - pagefault_disable(); - if (!PageHighMem(page)) - return page_address(page); -@@ -79,7 +85,7 @@ void *kmap_atomic(struct page *page) - - type = kmap_atomic_idx_push(); - -- idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id(); -+ idx = fixmap_idx(type); - vaddr = __fix_to_virt(idx); - #ifdef CONFIG_DEBUG_HIGHMEM - /* -@@ -93,7 +99,10 @@ void *kmap_atomic(struct page *page) - * in place, so the contained TLB flush ensures the TLB is updated - * with the new mapping. - */ -- set_fixmap_pte(idx, mk_pte(page, kmap_prot)); -+#ifdef CONFIG_PREEMPT_RT_FULL -+ current->kmap_pte[type] = pte; -+#endif -+ set_fixmap_pte(idx, pte); - - return (void *)vaddr; - } -@@ -106,44 +115,75 @@ void __kunmap_atomic(void *kvaddr) - - if (kvaddr >= (void *)FIXADDR_START) { - type = kmap_atomic_idx(); -- idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id(); -+ idx = fixmap_idx(type); - - if (cache_is_vivt()) - __cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE); -+#ifdef CONFIG_PREEMPT_RT_FULL -+ current->kmap_pte[type] = __pte(0); -+#endif - #ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(vaddr != __fix_to_virt(idx)); -- set_fixmap_pte(idx, __pte(0)); - #else - (void) idx; /* to kill a warning */ - #endif -+ set_fixmap_pte(idx, __pte(0)); - kmap_atomic_idx_pop(); - } else if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) { - /* this address was obtained through kmap_high_get() */ - kunmap_high(pte_page(pkmap_page_table[PKMAP_NR(vaddr)])); - } - pagefault_enable(); -- preempt_enable(); -+ preempt_enable_nort(); - } - EXPORT_SYMBOL(__kunmap_atomic); - - void *kmap_atomic_pfn(unsigned long pfn) - { -+ pte_t pte = pfn_pte(pfn, kmap_prot); - unsigned long vaddr; - int idx, type; - struct page *page = pfn_to_page(pfn); - -- preempt_disable(); -+ preempt_disable_nort(); - pagefault_disable(); - if (!PageHighMem(page)) - return page_address(page); - - type = kmap_atomic_idx_push(); -- idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id(); -+ idx = fixmap_idx(type); - vaddr = __fix_to_virt(idx); - #ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(!pte_none(get_fixmap_pte(vaddr))); - #endif -- set_fixmap_pte(idx, pfn_pte(pfn, kmap_prot)); -+#ifdef CONFIG_PREEMPT_RT_FULL -+ current->kmap_pte[type] = pte; -+#endif -+ set_fixmap_pte(idx, pte); - - return (void *)vaddr; - } -+#if defined CONFIG_PREEMPT_RT_FULL -+void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p) -+{ -+ int i; -+ -+ /* -+ * Clear @prev's kmap_atomic mappings -+ */ -+ for (i = 0; i < prev_p->kmap_idx; i++) { -+ int idx = fixmap_idx(i); -+ -+ set_fixmap_pte(idx, __pte(0)); -+ } -+ /* -+ * Restore @next_p's kmap_atomic mappings -+ */ -+ for (i = 0; i < next_p->kmap_idx; i++) { -+ int idx = fixmap_idx(i); -+ -+ if (!pte_none(next_p->kmap_pte[i])) -+ set_fixmap_pte(idx, next_p->kmap_pte[i]); -+ } -+} -+#endif -diff --git a/arch/arm/plat-versatile/platsmp.c b/arch/arm/plat-versatile/platsmp.c -index 53feb90c840c..b4a8d54fc3f3 100644 ---- a/arch/arm/plat-versatile/platsmp.c -+++ b/arch/arm/plat-versatile/platsmp.c -@@ -30,7 +30,7 @@ static void write_pen_release(int val) - sync_cache_w(&pen_release); - } - --static DEFINE_SPINLOCK(boot_lock); -+static DEFINE_RAW_SPINLOCK(boot_lock); - - void versatile_secondary_init(unsigned int cpu) - { -@@ -43,8 +43,8 @@ void versatile_secondary_init(unsigned int cpu) - /* - * Synchronise with the boot thread. - */ -- spin_lock(&boot_lock); -- spin_unlock(&boot_lock); -+ raw_spin_lock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - } - - int versatile_boot_secondary(unsigned int cpu, struct task_struct *idle) -@@ -55,7 +55,7 @@ int versatile_boot_secondary(unsigned int cpu, struct task_struct *idle) - * Set synchronisation state between this boot processor - * and the secondary one - */ -- spin_lock(&boot_lock); -+ raw_spin_lock(&boot_lock); - - /* - * This is really belt and braces; we hold unintended secondary -@@ -85,7 +85,7 @@ int versatile_boot_secondary(unsigned int cpu, struct task_struct *idle) - * now the secondary core is starting up let it run its - * calibrations, then wait for it to finish - */ -- spin_unlock(&boot_lock); -+ raw_spin_unlock(&boot_lock); - - return pen_release != -1 ? -ENOSYS : 0; - } -diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig -index 4f436220384f..0d7f54cebae3 100644 ---- a/arch/arm64/Kconfig -+++ b/arch/arm64/Kconfig -@@ -81,6 +81,7 @@ config ARM64 - select HAVE_PERF_REGS - select HAVE_PERF_USER_STACK_DUMP - select HAVE_RCU_TABLE_FREE -+ select HAVE_PREEMPT_LAZY - select HAVE_SYSCALL_TRACEPOINTS - select IOMMU_DMA if IOMMU_SUPPORT - select IRQ_DOMAIN -@@ -624,7 +625,7 @@ config XEN_DOM0 - - config XEN - bool "Xen guest support on ARM64" -- depends on ARM64 && OF -+ depends on ARM64 && OF && !PREEMPT_RT_FULL - select SWIOTLB_XEN - select PARAVIRT - help -diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h -index abd64bd1f6d9..9170788ffa37 100644 ---- a/arch/arm64/include/asm/thread_info.h -+++ b/arch/arm64/include/asm/thread_info.h -@@ -49,6 +49,7 @@ struct thread_info { - mm_segment_t addr_limit; /* address limit */ - struct task_struct *task; /* main task structure */ - int preempt_count; /* 0 => preemptable, <0 => bug */ -+ int preempt_lazy_count; /* 0 => preemptable, <0 => bug */ - int cpu; /* cpu */ - }; - -@@ -109,6 +110,7 @@ static inline struct thread_info *current_thread_info(void) - #define TIF_NEED_RESCHED 1 - #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ - #define TIF_FOREIGN_FPSTATE 3 /* CPU's FP state is not current's */ -+#define TIF_NEED_RESCHED_LAZY 4 - #define TIF_NOHZ 7 - #define TIF_SYSCALL_TRACE 8 - #define TIF_SYSCALL_AUDIT 9 -@@ -124,6 +126,7 @@ static inline struct thread_info *current_thread_info(void) - #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) - #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) - #define _TIF_FOREIGN_FPSTATE (1 << TIF_FOREIGN_FPSTATE) -+#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY) - #define _TIF_NOHZ (1 << TIF_NOHZ) - #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) - #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) -@@ -132,7 +135,8 @@ static inline struct thread_info *current_thread_info(void) - #define _TIF_32BIT (1 << TIF_32BIT) - - #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ -- _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE) -+ _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \ -+ _TIF_NEED_RESCHED_LAZY) - - #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ - _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \ -diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c -index 1abcd8829f3b..8290a50d6dd3 100644 ---- a/arch/arm64/kernel/asm-offsets.c -+++ b/arch/arm64/kernel/asm-offsets.c -@@ -36,6 +36,7 @@ int main(void) - BLANK(); - DEFINE(TI_FLAGS, offsetof(struct thread_info, flags)); - DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count)); -+ DEFINE(TI_PREEMPT_LAZY, offsetof(struct thread_info, preempt_lazy_count)); - DEFINE(TI_ADDR_LIMIT, offsetof(struct thread_info, addr_limit)); - DEFINE(TI_TASK, offsetof(struct thread_info, task)); - DEFINE(TI_CPU, offsetof(struct thread_info, cpu)); -diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S -index 6c3b7345a6c4..d4ec679f7e1f 100644 ---- a/arch/arm64/kernel/entry.S -+++ b/arch/arm64/kernel/entry.S -@@ -426,11 +426,16 @@ ENDPROC(el1_sync) - - #ifdef CONFIG_PREEMPT - ldr w24, [tsk, #TI_PREEMPT] // get preempt count -- cbnz w24, 1f // preempt count != 0 -+ cbnz w24, 2f // preempt count != 0 - ldr x0, [tsk, #TI_FLAGS] // get flags -- tbz x0, #TIF_NEED_RESCHED, 1f // needs rescheduling? -- bl el1_preempt -+ tbnz x0, #TIF_NEED_RESCHED, 1f // needs rescheduling? -+ -+ ldr w24, [tsk, #TI_PREEMPT_LAZY] // get preempt lazy count -+ cbnz w24, 2f // preempt lazy count != 0 -+ tbz x0, #TIF_NEED_RESCHED_LAZY, 2f // needs rescheduling? - 1: -+ bl el1_preempt -+2: - #endif - #ifdef CONFIG_TRACE_IRQFLAGS - bl trace_hardirqs_on -@@ -444,6 +449,7 @@ ENDPROC(el1_irq) - 1: bl preempt_schedule_irq // irq en/disable is done inside - ldr x0, [tsk, #TI_FLAGS] // get new tasks TI_FLAGS - tbnz x0, #TIF_NEED_RESCHED, 1b // needs rescheduling? -+ tbnz x0, #TIF_NEED_RESCHED_LAZY, 1b // needs rescheduling? - ret x24 - #endif - -@@ -690,6 +696,7 @@ ENDPROC(cpu_switch_to) - */ - work_pending: - tbnz x1, #TIF_NEED_RESCHED, work_resched -+ tbnz x1, #TIF_NEED_RESCHED_LAZY, work_resched - /* TIF_SIGPENDING, TIF_NOTIFY_RESUME or TIF_FOREIGN_FPSTATE case */ - mov x0, sp // 'regs' - enable_irq // enable interrupts for do_notify_resume() -diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig -index 2018c2b0e078..3f3820fdb80e 100644 ---- a/arch/mips/Kconfig -+++ b/arch/mips/Kconfig -@@ -2416,7 +2416,7 @@ config CPU_R4400_WORKAROUNDS - # - config HIGHMEM - bool "High Memory Support" -- depends on 32BIT && CPU_SUPPORTS_HIGHMEM && SYS_SUPPORTS_HIGHMEM && !CPU_MIPS32_3_5_EVA -+ depends on 32BIT && CPU_SUPPORTS_HIGHMEM && SYS_SUPPORTS_HIGHMEM && !CPU_MIPS32_3_5_EVA && !PREEMPT_RT_FULL - - config CPU_SUPPORTS_HIGHMEM - bool -diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig -index 7cd32c038286..69c3f4db485b 100644 ---- a/arch/powerpc/Kconfig -+++ b/arch/powerpc/Kconfig -@@ -57,10 +57,11 @@ config LOCKDEP_SUPPORT - - config RWSEM_GENERIC_SPINLOCK - bool -+ default y if PREEMPT_RT_FULL - - config RWSEM_XCHGADD_ALGORITHM - bool -- default y -+ default y if !PREEMPT_RT_FULL - - config GENERIC_LOCKBREAK - bool -@@ -138,6 +139,7 @@ config PPC - select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER -+ select HAVE_PREEMPT_LAZY - select HAVE_MOD_ARCH_SPECIFIC - select MODULES_USE_ELF_RELA - select CLONE_BACKWARDS -@@ -319,7 +321,7 @@ menu "Kernel options" - - config HIGHMEM - bool "High memory support" -- depends on PPC32 -+ depends on PPC32 && !PREEMPT_RT_FULL - - source kernel/Kconfig.hz - source kernel/Kconfig.preempt -diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h -index 7efee4a3240b..40e6fa1b85b2 100644 ---- a/arch/powerpc/include/asm/thread_info.h -+++ b/arch/powerpc/include/asm/thread_info.h -@@ -42,6 +42,8 @@ struct thread_info { - int cpu; /* cpu we're on */ - int preempt_count; /* 0 => preemptable, - <0 => BUG */ -+ int preempt_lazy_count; /* 0 => preemptable, -+ <0 => BUG */ - unsigned long local_flags; /* private flags for thread */ - - /* low level flags - has atomic operations done on it */ -@@ -82,8 +84,7 @@ static inline struct thread_info *current_thread_info(void) - #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ - #define TIF_SIGPENDING 1 /* signal pending */ - #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ --#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling -- TIF_NEED_RESCHED */ -+#define TIF_NEED_RESCHED_LAZY 3 /* lazy rescheduling necessary */ - #define TIF_32BIT 4 /* 32 bit binary */ - #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ - #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ -@@ -101,6 +102,8 @@ static inline struct thread_info *current_thread_info(void) - #if defined(CONFIG_PPC64) - #define TIF_ELF2ABI 18 /* function descriptors must die! */ - #endif -+#define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling -+ TIF_NEED_RESCHED */ - - /* as above, but as bit values */ - #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) -@@ -119,14 +122,16 @@ static inline struct thread_info *current_thread_info(void) - #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) - #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE) - #define _TIF_NOHZ (1<<TIF_NOHZ) -+#define _TIF_NEED_RESCHED_LAZY (1<<TIF_NEED_RESCHED_LAZY) - #define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ - _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ - _TIF_NOHZ) - - #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ - _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ -- _TIF_RESTORE_TM) -+ _TIF_RESTORE_TM | _TIF_NEED_RESCHED_LAZY) - #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) -+#define _TIF_NEED_RESCHED_MASK (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY) - - /* Bits in local_flags */ - /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ -diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c -index 0d0183d3180a..476cf176816b 100644 ---- a/arch/powerpc/kernel/asm-offsets.c -+++ b/arch/powerpc/kernel/asm-offsets.c -@@ -162,6 +162,7 @@ int main(void) - DEFINE(TI_FLAGS, offsetof(struct thread_info, flags)); - DEFINE(TI_LOCAL_FLAGS, offsetof(struct thread_info, local_flags)); - DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count)); -+ DEFINE(TI_PREEMPT_LAZY, offsetof(struct thread_info, preempt_lazy_count)); - DEFINE(TI_TASK, offsetof(struct thread_info, task)); - DEFINE(TI_CPU, offsetof(struct thread_info, cpu)); - -diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S -index 2405631e91a2..c21b4b42eaa0 100644 ---- a/arch/powerpc/kernel/entry_32.S -+++ b/arch/powerpc/kernel/entry_32.S -@@ -818,7 +818,14 @@ user_exc_return: /* r10 contains MSR_KERNEL here */ - cmpwi 0,r0,0 /* if non-zero, just restore regs and return */ - bne restore - andi. r8,r8,_TIF_NEED_RESCHED -+ bne+ 1f -+ lwz r0,TI_PREEMPT_LAZY(r9) -+ cmpwi 0,r0,0 /* if non-zero, just restore regs and return */ -+ bne restore -+ lwz r0,TI_FLAGS(r9) -+ andi. r0,r0,_TIF_NEED_RESCHED_LAZY - beq+ restore -+1: - lwz r3,_MSR(r1) - andi. r0,r3,MSR_EE /* interrupts off? */ - beq restore /* don't schedule if so */ -@@ -829,11 +836,11 @@ user_exc_return: /* r10 contains MSR_KERNEL here */ - */ - bl trace_hardirqs_off - #endif --1: bl preempt_schedule_irq -+2: bl preempt_schedule_irq - CURRENT_THREAD_INFO(r9, r1) - lwz r3,TI_FLAGS(r9) -- andi. r0,r3,_TIF_NEED_RESCHED -- bne- 1b -+ andi. r0,r3,_TIF_NEED_RESCHED_MASK -+ bne- 2b - #ifdef CONFIG_TRACE_IRQFLAGS - /* And now, to properly rebalance the above, we tell lockdep they - * are being turned back on, which will happen when we return -@@ -1154,7 +1161,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX) - #endif /* !(CONFIG_4xx || CONFIG_BOOKE) */ - - do_work: /* r10 contains MSR_KERNEL here */ -- andi. r0,r9,_TIF_NEED_RESCHED -+ andi. r0,r9,_TIF_NEED_RESCHED_MASK - beq do_user_signal - - do_resched: /* r10 contains MSR_KERNEL here */ -@@ -1175,7 +1182,7 @@ do_resched: /* r10 contains MSR_KERNEL here */ - MTMSRD(r10) /* disable interrupts */ - CURRENT_THREAD_INFO(r9, r1) - lwz r9,TI_FLAGS(r9) -- andi. r0,r9,_TIF_NEED_RESCHED -+ andi. r0,r9,_TIF_NEED_RESCHED_MASK - bne- do_resched - andi. r0,r9,_TIF_USER_WORK_MASK - beq restore_user -diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S -index 9916d150b28c..5dce9354223c 100644 ---- a/arch/powerpc/kernel/entry_64.S -+++ b/arch/powerpc/kernel/entry_64.S -@@ -644,7 +644,7 @@ _GLOBAL(ret_from_except_lite) - bl restore_math - b restore - #endif --1: andi. r0,r4,_TIF_NEED_RESCHED -+1: andi. r0,r4,_TIF_NEED_RESCHED_MASK - beq 2f - bl restore_interrupts - SCHEDULE_USER -@@ -706,10 +706,18 @@ _GLOBAL(ret_from_except_lite) - - #ifdef CONFIG_PREEMPT - /* Check if we need to preempt */ -- andi. r0,r4,_TIF_NEED_RESCHED -- beq+ restore -- /* Check that preempt_count() == 0 and interrupts are enabled */ - lwz r8,TI_PREEMPT(r9) -+ cmpwi 0,r8,0 /* if non-zero, just restore regs and return */ -+ bne restore -+ andi. r0,r4,_TIF_NEED_RESCHED -+ bne+ check_count -+ -+ andi. r0,r4,_TIF_NEED_RESCHED_LAZY -+ beq+ restore -+ lwz r8,TI_PREEMPT_LAZY(r9) -+ -+ /* Check that preempt_count() == 0 and interrupts are enabled */ -+check_count: - cmpwi cr1,r8,0 - ld r0,SOFTE(r1) - cmpdi r0,0 -@@ -726,7 +734,7 @@ _GLOBAL(ret_from_except_lite) - /* Re-test flags and eventually loop */ - CURRENT_THREAD_INFO(r9, r1) - ld r4,TI_FLAGS(r9) -- andi. r0,r4,_TIF_NEED_RESCHED -+ andi. r0,r4,_TIF_NEED_RESCHED_MASK - bne 1b - - /* -diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c -index 290559df1e8b..070afa6da35d 100644 ---- a/arch/powerpc/kernel/irq.c -+++ b/arch/powerpc/kernel/irq.c -@@ -614,6 +614,7 @@ void irq_ctx_init(void) - } - } - -+#ifndef CONFIG_PREEMPT_RT_FULL - void do_softirq_own_stack(void) - { - struct thread_info *curtp, *irqtp; -@@ -631,6 +632,7 @@ void do_softirq_own_stack(void) - if (irqtp->flags) - set_bits(irqtp->flags, &curtp->flags); - } -+#endif - - irq_hw_number_t virq_to_hw(unsigned int virq) - { -diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S -index bf5160fbf9d8..e551d78c8038 100644 ---- a/arch/powerpc/kernel/misc_32.S -+++ b/arch/powerpc/kernel/misc_32.S -@@ -40,6 +40,7 @@ - * We store the saved ksp_limit in the unused part - * of the STACK_FRAME_OVERHEAD - */ -+#ifndef CONFIG_PREEMPT_RT_FULL - _GLOBAL(call_do_softirq) - mflr r0 - stw r0,4(r1) -@@ -56,6 +57,7 @@ _GLOBAL(call_do_softirq) - stw r10,THREAD+KSP_LIMIT(r2) - mtlr r0 - blr -+#endif - - /* - * void call_do_irq(struct pt_regs *regs, struct thread_info *irqtp); -diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S -index f28754c497e5..31ae513acac9 100644 ---- a/arch/powerpc/kernel/misc_64.S -+++ b/arch/powerpc/kernel/misc_64.S -@@ -30,6 +30,7 @@ - - .text - -+#ifndef CONFIG_PREEMPT_RT_FULL - _GLOBAL(call_do_softirq) - mflr r0 - std r0,16(r1) -@@ -40,6 +41,7 @@ _GLOBAL(call_do_softirq) - ld r0,16(r1) - mtlr r0 - blr -+#endif - - _GLOBAL(call_do_irq) - mflr r0 -diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig -index c2024ac9d4e8..2303788da7e1 100644 ---- a/arch/powerpc/kvm/Kconfig -+++ b/arch/powerpc/kvm/Kconfig -@@ -172,6 +172,7 @@ config KVM_E500MC - config KVM_MPIC - bool "KVM in-kernel MPIC emulation" - depends on KVM && E500 -+ depends on !PREEMPT_RT_FULL - select HAVE_KVM_IRQCHIP - select HAVE_KVM_IRQFD - select HAVE_KVM_IRQ_ROUTING -diff --git a/arch/powerpc/platforms/ps3/device-init.c b/arch/powerpc/platforms/ps3/device-init.c -index 3f175e8aedb4..c4c02f91904c 100644 ---- a/arch/powerpc/platforms/ps3/device-init.c -+++ b/arch/powerpc/platforms/ps3/device-init.c -@@ -752,7 +752,7 @@ static int ps3_notification_read_write(struct ps3_notification_device *dev, - } - pr_debug("%s:%u: notification %s issued\n", __func__, __LINE__, op); - -- res = wait_event_interruptible(dev->done.wait, -+ res = swait_event_interruptible(dev->done.wait, - dev->done.done || kthread_should_stop()); - if (kthread_should_stop()) - res = -EINTR; -diff --git a/arch/sh/kernel/irq.c b/arch/sh/kernel/irq.c -index 6c0378c0b8b5..abd58b4dff97 100644 ---- a/arch/sh/kernel/irq.c -+++ b/arch/sh/kernel/irq.c -@@ -147,6 +147,7 @@ void irq_ctx_exit(int cpu) - hardirq_ctx[cpu] = NULL; - } - -+#ifndef CONFIG_PREEMPT_RT_FULL - void do_softirq_own_stack(void) - { - struct thread_info *curctx; -@@ -174,6 +175,7 @@ void do_softirq_own_stack(void) - "r5", "r6", "r7", "r8", "r9", "r15", "t", "pr" - ); - } -+#endif - #else - static inline void handle_one_irq(unsigned int irq) - { -diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig -index 57ffaf285c2f..733c72826f28 100644 ---- a/arch/sparc/Kconfig -+++ b/arch/sparc/Kconfig -@@ -184,12 +184,10 @@ config NR_CPUS - source kernel/Kconfig.hz - - config RWSEM_GENERIC_SPINLOCK -- bool -- default y if SPARC32 -+ def_bool PREEMPT_RT_FULL - - config RWSEM_XCHGADD_ALGORITHM -- bool -- default y if SPARC64 -+ def_bool !RWSEM_GENERIC_SPINLOCK && !PREEMPT_RT_FULL - - config GENERIC_HWEIGHT - bool -diff --git a/arch/sparc/kernel/irq_64.c b/arch/sparc/kernel/irq_64.c -index e22416ce56ea..d359de71153a 100644 ---- a/arch/sparc/kernel/irq_64.c -+++ b/arch/sparc/kernel/irq_64.c -@@ -854,6 +854,7 @@ void __irq_entry handler_irq(int pil, struct pt_regs *regs) - set_irq_regs(old_regs); - } - -+#ifndef CONFIG_PREEMPT_RT_FULL - void do_softirq_own_stack(void) - { - void *orig_sp, *sp = softirq_stack[smp_processor_id()]; -@@ -868,6 +869,7 @@ void do_softirq_own_stack(void) - __asm__ __volatile__("mov %0, %%sp" - : : "r" (orig_sp)); - } -+#endif - - #ifdef CONFIG_HOTPLUG_CPU - void fixup_irqs(void) -diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig -index 2dc18605831f..ea65dc777a77 100644 ---- a/arch/x86/Kconfig -+++ b/arch/x86/Kconfig -@@ -17,6 +17,7 @@ config X86_64 - ### Arch settings - config X86 - def_bool y -+ select HAVE_PREEMPT_LAZY - select ACPI_LEGACY_TABLES_LOOKUP if ACPI - select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI - select ANON_INODES -@@ -230,8 +231,11 @@ config ARCH_MAY_HAVE_PC_FDC - def_bool y - depends on ISA_DMA_API - -+config RWSEM_GENERIC_SPINLOCK -+ def_bool PREEMPT_RT_FULL -+ - config RWSEM_XCHGADD_ALGORITHM -- def_bool y -+ def_bool !RWSEM_GENERIC_SPINLOCK && !PREEMPT_RT_FULL - - config GENERIC_CALIBRATE_DELAY - def_bool y -@@ -889,7 +893,7 @@ config IOMMU_HELPER - config MAXSMP - bool "Enable Maximum number of SMP Processors and NUMA Nodes" - depends on X86_64 && SMP && DEBUG_KERNEL -- select CPUMASK_OFFSTACK -+ select CPUMASK_OFFSTACK if !PREEMPT_RT_FULL - ---help--- - Enable maximum number of CPUS and NUMA Nodes for this architecture. - If unsure, say N. -diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c -index 064c7e2bd7c8..e400dd3947db 100644 ---- a/arch/x86/crypto/aesni-intel_glue.c -+++ b/arch/x86/crypto/aesni-intel_glue.c -@@ -383,14 +383,14 @@ static int ecb_encrypt(struct blkcipher_desc *desc, - err = blkcipher_walk_virt(desc, &walk); - desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; - -- kernel_fpu_begin(); - while ((nbytes = walk.nbytes)) { -+ kernel_fpu_begin(); - aesni_ecb_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr, -- nbytes & AES_BLOCK_MASK); -+ nbytes & AES_BLOCK_MASK); -+ kernel_fpu_end(); - nbytes &= AES_BLOCK_SIZE - 1; - err = blkcipher_walk_done(desc, &walk, nbytes); - } -- kernel_fpu_end(); - - return err; - } -@@ -407,14 +407,14 @@ static int ecb_decrypt(struct blkcipher_desc *desc, - err = blkcipher_walk_virt(desc, &walk); - desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; - -- kernel_fpu_begin(); - while ((nbytes = walk.nbytes)) { -+ kernel_fpu_begin(); - aesni_ecb_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr, - nbytes & AES_BLOCK_MASK); -+ kernel_fpu_end(); - nbytes &= AES_BLOCK_SIZE - 1; - err = blkcipher_walk_done(desc, &walk, nbytes); - } -- kernel_fpu_end(); - - return err; - } -@@ -431,14 +431,14 @@ static int cbc_encrypt(struct blkcipher_desc *desc, - err = blkcipher_walk_virt(desc, &walk); - desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; - -- kernel_fpu_begin(); - while ((nbytes = walk.nbytes)) { -+ kernel_fpu_begin(); - aesni_cbc_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr, - nbytes & AES_BLOCK_MASK, walk.iv); -+ kernel_fpu_end(); - nbytes &= AES_BLOCK_SIZE - 1; - err = blkcipher_walk_done(desc, &walk, nbytes); - } -- kernel_fpu_end(); - - return err; - } -@@ -455,14 +455,14 @@ static int cbc_decrypt(struct blkcipher_desc *desc, - err = blkcipher_walk_virt(desc, &walk); - desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; - -- kernel_fpu_begin(); - while ((nbytes = walk.nbytes)) { -+ kernel_fpu_begin(); - aesni_cbc_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr, - nbytes & AES_BLOCK_MASK, walk.iv); -+ kernel_fpu_end(); - nbytes &= AES_BLOCK_SIZE - 1; - err = blkcipher_walk_done(desc, &walk, nbytes); - } -- kernel_fpu_end(); - - return err; - } -@@ -514,18 +514,20 @@ static int ctr_crypt(struct blkcipher_desc *desc, - err = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE); - desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; - -- kernel_fpu_begin(); - while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) { -+ kernel_fpu_begin(); - aesni_ctr_enc_tfm(ctx, walk.dst.virt.addr, walk.src.virt.addr, - nbytes & AES_BLOCK_MASK, walk.iv); -+ kernel_fpu_end(); - nbytes &= AES_BLOCK_SIZE - 1; - err = blkcipher_walk_done(desc, &walk, nbytes); - } - if (walk.nbytes) { -+ kernel_fpu_begin(); - ctr_crypt_final(ctx, &walk); -+ kernel_fpu_end(); - err = blkcipher_walk_done(desc, &walk, 0); - } -- kernel_fpu_end(); - - return err; - } -diff --git a/arch/x86/crypto/cast5_avx_glue.c b/arch/x86/crypto/cast5_avx_glue.c -index 8648158f3916..d7699130ee36 100644 ---- a/arch/x86/crypto/cast5_avx_glue.c -+++ b/arch/x86/crypto/cast5_avx_glue.c -@@ -59,7 +59,7 @@ static inline void cast5_fpu_end(bool fpu_enabled) - static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk, - bool enc) - { -- bool fpu_enabled = false; -+ bool fpu_enabled; - struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); - const unsigned int bsize = CAST5_BLOCK_SIZE; - unsigned int nbytes; -@@ -75,7 +75,7 @@ static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk, - u8 *wsrc = walk->src.virt.addr; - u8 *wdst = walk->dst.virt.addr; - -- fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes); -+ fpu_enabled = cast5_fpu_begin(false, nbytes); - - /* Process multi-block batch */ - if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) { -@@ -103,10 +103,9 @@ static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk, - } while (nbytes >= bsize); - - done: -+ cast5_fpu_end(fpu_enabled); - err = blkcipher_walk_done(desc, walk, nbytes); - } -- -- cast5_fpu_end(fpu_enabled); - return err; - } - -@@ -227,7 +226,7 @@ static unsigned int __cbc_decrypt(struct blkcipher_desc *desc, - static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, - struct scatterlist *src, unsigned int nbytes) - { -- bool fpu_enabled = false; -+ bool fpu_enabled; - struct blkcipher_walk walk; - int err; - -@@ -236,12 +235,11 @@ static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, - desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; - - while ((nbytes = walk.nbytes)) { -- fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes); -+ fpu_enabled = cast5_fpu_begin(false, nbytes); - nbytes = __cbc_decrypt(desc, &walk); -+ cast5_fpu_end(fpu_enabled); - err = blkcipher_walk_done(desc, &walk, nbytes); - } -- -- cast5_fpu_end(fpu_enabled); - return err; - } - -@@ -311,7 +309,7 @@ static unsigned int __ctr_crypt(struct blkcipher_desc *desc, - static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, - struct scatterlist *src, unsigned int nbytes) - { -- bool fpu_enabled = false; -+ bool fpu_enabled; - struct blkcipher_walk walk; - int err; - -@@ -320,13 +318,12 @@ static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, - desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; - - while ((nbytes = walk.nbytes) >= CAST5_BLOCK_SIZE) { -- fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes); -+ fpu_enabled = cast5_fpu_begin(false, nbytes); - nbytes = __ctr_crypt(desc, &walk); -+ cast5_fpu_end(fpu_enabled); - err = blkcipher_walk_done(desc, &walk, nbytes); - } - -- cast5_fpu_end(fpu_enabled); -- - if (walk.nbytes) { - ctr_crypt_final(desc, &walk); - err = blkcipher_walk_done(desc, &walk, 0); -diff --git a/arch/x86/crypto/glue_helper.c b/arch/x86/crypto/glue_helper.c -index 6a85598931b5..3a506ce7ed93 100644 ---- a/arch/x86/crypto/glue_helper.c -+++ b/arch/x86/crypto/glue_helper.c -@@ -39,7 +39,7 @@ static int __glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx, - void *ctx = crypto_blkcipher_ctx(desc->tfm); - const unsigned int bsize = 128 / 8; - unsigned int nbytes, i, func_bytes; -- bool fpu_enabled = false; -+ bool fpu_enabled; - int err; - - err = blkcipher_walk_virt(desc, walk); -@@ -49,7 +49,7 @@ static int __glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx, - u8 *wdst = walk->dst.virt.addr; - - fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit, -- desc, fpu_enabled, nbytes); -+ desc, false, nbytes); - - for (i = 0; i < gctx->num_funcs; i++) { - func_bytes = bsize * gctx->funcs[i].num_blocks; -@@ -71,10 +71,10 @@ static int __glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx, - } - - done: -+ glue_fpu_end(fpu_enabled); - err = blkcipher_walk_done(desc, walk, nbytes); - } - -- glue_fpu_end(fpu_enabled); - return err; - } - -@@ -194,7 +194,7 @@ int glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx, - struct scatterlist *src, unsigned int nbytes) - { - const unsigned int bsize = 128 / 8; -- bool fpu_enabled = false; -+ bool fpu_enabled; - struct blkcipher_walk walk; - int err; - -@@ -203,12 +203,12 @@ int glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx, - - while ((nbytes = walk.nbytes)) { - fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit, -- desc, fpu_enabled, nbytes); -+ desc, false, nbytes); - nbytes = __glue_cbc_decrypt_128bit(gctx, desc, &walk); -+ glue_fpu_end(fpu_enabled); - err = blkcipher_walk_done(desc, &walk, nbytes); - } - -- glue_fpu_end(fpu_enabled); - return err; - } - EXPORT_SYMBOL_GPL(glue_cbc_decrypt_128bit); -@@ -277,7 +277,7 @@ int glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx, - struct scatterlist *src, unsigned int nbytes) - { - const unsigned int bsize = 128 / 8; -- bool fpu_enabled = false; -+ bool fpu_enabled; - struct blkcipher_walk walk; - int err; - -@@ -286,13 +286,12 @@ int glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx, - - while ((nbytes = walk.nbytes) >= bsize) { - fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit, -- desc, fpu_enabled, nbytes); -+ desc, false, nbytes); - nbytes = __glue_ctr_crypt_128bit(gctx, desc, &walk); -+ glue_fpu_end(fpu_enabled); - err = blkcipher_walk_done(desc, &walk, nbytes); - } - -- glue_fpu_end(fpu_enabled); -- - if (walk.nbytes) { - glue_ctr_crypt_final_128bit( - gctx->funcs[gctx->num_funcs - 1].fn_u.ctr, desc, &walk); -@@ -347,7 +346,7 @@ int glue_xts_crypt_128bit(const struct common_glue_ctx *gctx, - void *tweak_ctx, void *crypt_ctx) - { - const unsigned int bsize = 128 / 8; -- bool fpu_enabled = false; -+ bool fpu_enabled; - struct blkcipher_walk walk; - int err; - -@@ -360,21 +359,21 @@ int glue_xts_crypt_128bit(const struct common_glue_ctx *gctx, - - /* set minimum length to bsize, for tweak_fn */ - fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit, -- desc, fpu_enabled, -+ desc, false, - nbytes < bsize ? bsize : nbytes); -- - /* calculate first value of T */ - tweak_fn(tweak_ctx, walk.iv, walk.iv); -+ glue_fpu_end(fpu_enabled); - - while (nbytes) { -+ fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit, -+ desc, false, nbytes); - nbytes = __glue_xts_crypt_128bit(gctx, crypt_ctx, desc, &walk); - -+ glue_fpu_end(fpu_enabled); - err = blkcipher_walk_done(desc, &walk, nbytes); - nbytes = walk.nbytes; - } -- -- glue_fpu_end(fpu_enabled); -- - return err; - } - EXPORT_SYMBOL_GPL(glue_xts_crypt_128bit); -diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c -index e79d93d44ecd..ef2564dc2656 100644 ---- a/arch/x86/entry/common.c -+++ b/arch/x86/entry/common.c -@@ -202,7 +202,7 @@ long syscall_trace_enter(struct pt_regs *regs) - - #define EXIT_TO_USERMODE_LOOP_FLAGS \ - (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ -- _TIF_NEED_RESCHED | _TIF_USER_RETURN_NOTIFY) -+ _TIF_NEED_RESCHED_MASK | _TIF_USER_RETURN_NOTIFY) - - static void exit_to_usermode_loop(struct pt_regs *regs, u32 cached_flags) - { -@@ -218,9 +218,16 @@ static void exit_to_usermode_loop(struct pt_regs *regs, u32 cached_flags) - /* We have work to do. */ - local_irq_enable(); - -- if (cached_flags & _TIF_NEED_RESCHED) -+ if (cached_flags & _TIF_NEED_RESCHED_MASK) - schedule(); - -+#ifdef ARCH_RT_DELAYS_SIGNAL_SEND -+ if (unlikely(current->forced_info.si_signo)) { -+ struct task_struct *t = current; -+ force_sig_info(t->forced_info.si_signo, &t->forced_info, t); -+ t->forced_info.si_signo = 0; -+ } -+#endif - if (cached_flags & _TIF_UPROBE) - uprobe_notify_resume(regs); - -diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S -index 10868aa734dc..7c7d3085f046 100644 ---- a/arch/x86/entry/entry_32.S -+++ b/arch/x86/entry/entry_32.S -@@ -278,8 +278,24 @@ END(ret_from_exception) - ENTRY(resume_kernel) - DISABLE_INTERRUPTS(CLBR_ANY) - need_resched: -+ # preempt count == 0 + NEED_RS set? - cmpl $0, PER_CPU_VAR(__preempt_count) -+#ifndef CONFIG_PREEMPT_LAZY - jnz restore_all -+#else -+ jz test_int_off -+ -+ # atleast preempt count == 0 ? -+ cmpl $_PREEMPT_ENABLED,PER_CPU_VAR(__preempt_count) -+ jne restore_all -+ -+ cmpl $0,TI_preempt_lazy_count(%ebp) # non-zero preempt_lazy_count ? -+ jnz restore_all -+ -+ testl $_TIF_NEED_RESCHED_LAZY, TI_flags(%ebp) -+ jz restore_all -+test_int_off: -+#endif - testl $X86_EFLAGS_IF, PT_EFLAGS(%esp) # interrupts off (exception path) ? - jz restore_all - call preempt_schedule_irq -diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S -index 858b555e274b..a93639ddfbf6 100644 ---- a/arch/x86/entry/entry_64.S -+++ b/arch/x86/entry/entry_64.S -@@ -511,7 +511,23 @@ GLOBAL(retint_user) - bt $9, EFLAGS(%rsp) /* were interrupts off? */ - jnc 1f - 0: cmpl $0, PER_CPU_VAR(__preempt_count) -+#ifndef CONFIG_PREEMPT_LAZY - jnz 1f -+#else -+ jz do_preempt_schedule_irq -+ -+ # atleast preempt count == 0 ? -+ cmpl $_PREEMPT_ENABLED,PER_CPU_VAR(__preempt_count) -+ jnz 1f -+ -+ GET_THREAD_INFO(%rcx) -+ cmpl $0, TI_preempt_lazy_count(%rcx) -+ jnz 1f -+ -+ bt $TIF_NEED_RESCHED_LAZY,TI_flags(%rcx) -+ jnc 1f -+do_preempt_schedule_irq: -+#endif - call preempt_schedule_irq - jmp 0b - 1: -@@ -799,6 +815,7 @@ END(native_load_gs_index) - jmp 2b - .previous - -+#ifndef CONFIG_PREEMPT_RT_FULL - /* Call softirq on interrupt stack. Interrupts are off. */ - ENTRY(do_softirq_own_stack) - pushq %rbp -@@ -811,6 +828,7 @@ ENTRY(do_softirq_own_stack) - decl PER_CPU_VAR(irq_count) - ret - END(do_softirq_own_stack) -+#endif - - #ifdef CONFIG_XEN - idtentry xen_hypervisor_callback xen_do_hypervisor_callback has_error_code=0 -diff --git a/arch/x86/include/asm/preempt.h b/arch/x86/include/asm/preempt.h -index d397deb58146..190af4271b5c 100644 ---- a/arch/x86/include/asm/preempt.h -+++ b/arch/x86/include/asm/preempt.h -@@ -79,17 +79,33 @@ static __always_inline void __preempt_count_sub(int val) - * a decrement which hits zero means we have no preempt_count and should - * reschedule. - */ --static __always_inline bool __preempt_count_dec_and_test(void) -+static __always_inline bool ____preempt_count_dec_and_test(void) - { - GEN_UNARY_RMWcc("decl", __preempt_count, __percpu_arg(0), "e"); - } - -+static __always_inline bool __preempt_count_dec_and_test(void) -+{ -+ if (____preempt_count_dec_and_test()) -+ return true; -+#ifdef CONFIG_PREEMPT_LAZY -+ return test_thread_flag(TIF_NEED_RESCHED_LAZY); -+#else -+ return false; -+#endif -+} -+ - /* - * Returns true when we need to resched and can (barring IRQ state). - */ - static __always_inline bool should_resched(int preempt_offset) - { -+#ifdef CONFIG_PREEMPT_LAZY -+ return unlikely(raw_cpu_read_4(__preempt_count) == preempt_offset || -+ test_thread_flag(TIF_NEED_RESCHED_LAZY)); -+#else - return unlikely(raw_cpu_read_4(__preempt_count) == preempt_offset); -+#endif - } - - #ifdef CONFIG_PREEMPT -diff --git a/arch/x86/include/asm/signal.h b/arch/x86/include/asm/signal.h -index 2138c9ae19ee..3f5b4ee2e2c1 100644 ---- a/arch/x86/include/asm/signal.h -+++ b/arch/x86/include/asm/signal.h -@@ -23,6 +23,19 @@ typedef struct { - unsigned long sig[_NSIG_WORDS]; - } sigset_t; - -+/* -+ * Because some traps use the IST stack, we must keep preemption -+ * disabled while calling do_trap(), but do_trap() may call -+ * force_sig_info() which will grab the signal spin_locks for the -+ * task, which in PREEMPT_RT_FULL are mutexes. By defining -+ * ARCH_RT_DELAYS_SIGNAL_SEND the force_sig_info() will set -+ * TIF_NOTIFY_RESUME and set up the signal to be sent on exit of the -+ * trap. -+ */ -+#if defined(CONFIG_PREEMPT_RT_FULL) -+#define ARCH_RT_DELAYS_SIGNAL_SEND -+#endif -+ - #ifndef CONFIG_COMPAT - typedef sigset_t compat_sigset_t; - #endif -diff --git a/arch/x86/include/asm/stackprotector.h b/arch/x86/include/asm/stackprotector.h -index 58505f01962f..02fa39652cd6 100644 ---- a/arch/x86/include/asm/stackprotector.h -+++ b/arch/x86/include/asm/stackprotector.h -@@ -59,7 +59,7 @@ - */ - static __always_inline void boot_init_stack_canary(void) - { -- u64 canary; -+ u64 uninitialized_var(canary); - u64 tsc; - - #ifdef CONFIG_X86_64 -@@ -70,8 +70,15 @@ static __always_inline void boot_init_stack_canary(void) - * of randomness. The TSC only matters for very early init, - * there it already has some randomness on most systems. Later - * on during the bootup the random pool has true entropy too. -+ * -+ * For preempt-rt we need to weaken the randomness a bit, as -+ * we can't call into the random generator from atomic context -+ * due to locking constraints. We just leave canary -+ * uninitialized and use the TSC based randomness on top of it. - */ -+#ifndef CONFIG_PREEMPT_RT_FULL - get_random_bytes(&canary, sizeof(canary)); -+#endif - tsc = rdtsc(); - canary += tsc + (tsc << 32UL); - -diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h -index ffae84df8a93..b4575ba19a59 100644 ---- a/arch/x86/include/asm/thread_info.h -+++ b/arch/x86/include/asm/thread_info.h -@@ -58,6 +58,8 @@ struct thread_info { - __u32 status; /* thread synchronous flags */ - __u32 cpu; /* current CPU */ - mm_segment_t addr_limit; -+ int preempt_lazy_count; /* 0 => lazy preemptable -+ <0 => BUG */ - unsigned int sig_on_uaccess_error:1; - unsigned int uaccess_err:1; /* uaccess failed */ - }; -@@ -95,6 +97,7 @@ struct thread_info { - #define TIF_SYSCALL_EMU 6 /* syscall emulation active */ - #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ - #define TIF_SECCOMP 8 /* secure computing */ -+#define TIF_NEED_RESCHED_LAZY 9 /* lazy rescheduling necessary */ - #define TIF_USER_RETURN_NOTIFY 11 /* notify kernel of userspace return */ - #define TIF_UPROBE 12 /* breakpointed or singlestepping */ - #define TIF_NOTSC 16 /* TSC is not accessible in userland */ -@@ -119,6 +122,7 @@ struct thread_info { - #define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU) - #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) - #define _TIF_SECCOMP (1 << TIF_SECCOMP) -+#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY) - #define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY) - #define _TIF_UPROBE (1 << TIF_UPROBE) - #define _TIF_NOTSC (1 << TIF_NOTSC) -@@ -155,6 +159,8 @@ struct thread_info { - #define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY) - #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW) - -+#define _TIF_NEED_RESCHED_MASK (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY) -+ - #define STACK_WARN (THREAD_SIZE/8) - - /* -diff --git a/arch/x86/include/asm/uv/uv_bau.h b/arch/x86/include/asm/uv/uv_bau.h -index fc808b83fccb..ebb40118abf5 100644 ---- a/arch/x86/include/asm/uv/uv_bau.h -+++ b/arch/x86/include/asm/uv/uv_bau.h -@@ -615,9 +615,9 @@ struct bau_control { - cycles_t send_message; - cycles_t period_end; - cycles_t period_time; -- spinlock_t uvhub_lock; -- spinlock_t queue_lock; -- spinlock_t disable_lock; -+ raw_spinlock_t uvhub_lock; -+ raw_spinlock_t queue_lock; -+ raw_spinlock_t disable_lock; - /* tunables */ - int max_concurr; - int max_concurr_const; -@@ -776,15 +776,15 @@ static inline int atom_asr(short i, struct atomic_short *v) - * to be lowered below the current 'v'. atomic_add_unless can only stop - * on equal. - */ --static inline int atomic_inc_unless_ge(spinlock_t *lock, atomic_t *v, int u) -+static inline int atomic_inc_unless_ge(raw_spinlock_t *lock, atomic_t *v, int u) - { -- spin_lock(lock); -+ raw_spin_lock(lock); - if (atomic_read(v) >= u) { -- spin_unlock(lock); -+ raw_spin_unlock(lock); - return 0; - } - atomic_inc(v); -- spin_unlock(lock); -+ raw_spin_unlock(lock); - return 1; - } - -diff --git a/arch/x86/include/asm/uv/uv_hub.h b/arch/x86/include/asm/uv/uv_hub.h -index ea7074784cc4..01ec643ce66e 100644 ---- a/arch/x86/include/asm/uv/uv_hub.h -+++ b/arch/x86/include/asm/uv/uv_hub.h -@@ -492,7 +492,7 @@ struct uv_blade_info { - unsigned short nr_online_cpus; - unsigned short pnode; - short memory_nid; -- spinlock_t nmi_lock; /* obsolete, see uv_hub_nmi */ -+ raw_spinlock_t nmi_lock; /* obsolete, see uv_hub_nmi */ - unsigned long nmi_count; /* obsolete, see uv_hub_nmi */ - }; - extern struct uv_blade_info *uv_blade_info; -diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c -index fdb0fbfb1197..678c711e2a16 100644 ---- a/arch/x86/kernel/apic/io_apic.c -+++ b/arch/x86/kernel/apic/io_apic.c -@@ -1711,7 +1711,8 @@ static bool io_apic_level_ack_pending(struct mp_chip_data *data) - static inline bool ioapic_irqd_mask(struct irq_data *data) - { - /* If we are moving the irq we need to mask it */ -- if (unlikely(irqd_is_setaffinity_pending(data))) { -+ if (unlikely(irqd_is_setaffinity_pending(data) && -+ !irqd_irq_inprogress(data))) { - mask_ioapic_irq(data); - return true; - } -diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c -index d7ce96a7daca..cd97771f61d6 100644 ---- a/arch/x86/kernel/apic/x2apic_uv_x.c -+++ b/arch/x86/kernel/apic/x2apic_uv_x.c -@@ -755,7 +755,7 @@ static void uv_heartbeat(unsigned long ignored) - uv_set_scir_bits(bits); - - /* enable next timer period */ -- mod_timer_pinned(timer, jiffies + SCIR_CPU_HB_INTERVAL); -+ mod_timer(timer, jiffies + SCIR_CPU_HB_INTERVAL); - } - - static void uv_heartbeat_enable(int cpu) -@@ -764,7 +764,7 @@ static void uv_heartbeat_enable(int cpu) - struct timer_list *timer = &uv_cpu_hub_info(cpu)->scir.timer; - - uv_set_cpu_scir_bits(cpu, SCIR_CPU_HEARTBEAT|SCIR_CPU_ACTIVITY); -- setup_timer(timer, uv_heartbeat, cpu); -+ setup_pinned_timer(timer, uv_heartbeat, cpu); - timer->expires = jiffies + SCIR_CPU_HB_INTERVAL; - add_timer_on(timer, cpu); - uv_cpu_hub_info(cpu)->scir.enabled = 1; -@@ -950,7 +950,7 @@ void __init uv_system_init(void) - uv_blade_info[blade].pnode = pnode; - uv_blade_info[blade].nr_possible_cpus = 0; - uv_blade_info[blade].nr_online_cpus = 0; -- spin_lock_init(&uv_blade_info[blade].nmi_lock); -+ raw_spin_lock_init(&uv_blade_info[blade].nmi_lock); - min_pnode = min(pnode, min_pnode); - max_pnode = max(pnode, max_pnode); - blade++; -diff --git a/arch/x86/kernel/asm-offsets.c b/arch/x86/kernel/asm-offsets.c -index 5c042466f274..ea558b0576d0 100644 ---- a/arch/x86/kernel/asm-offsets.c -+++ b/arch/x86/kernel/asm-offsets.c -@@ -32,6 +32,7 @@ void common(void) { - OFFSET(TI_flags, thread_info, flags); - OFFSET(TI_status, thread_info, status); - OFFSET(TI_addr_limit, thread_info, addr_limit); -+ OFFSET(TI_preempt_lazy_count, thread_info, preempt_lazy_count); - - BLANK(); - OFFSET(crypto_tfm_ctx_offset, crypto_tfm, __crt_ctx); -@@ -85,4 +86,5 @@ void common(void) { - - BLANK(); - DEFINE(PTREGS_SIZE, sizeof(struct pt_regs)); -+ DEFINE(_PREEMPT_ENABLED, PREEMPT_ENABLED); - } -diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c -index f0c921b03e42..f3bd7b8302ef 100644 ---- a/arch/x86/kernel/cpu/mcheck/mce.c -+++ b/arch/x86/kernel/cpu/mcheck/mce.c -@@ -41,6 +41,8 @@ - #include <linux/debugfs.h> - #include <linux/irq_work.h> - #include <linux/export.h> -+#include <linux/jiffies.h> -+#include <linux/swork.h> - - #include <asm/processor.h> - #include <asm/traps.h> -@@ -1240,7 +1242,7 @@ void mce_log_therm_throt_event(__u64 status) - static unsigned long check_interval = INITIAL_CHECK_INTERVAL; - - static DEFINE_PER_CPU(unsigned long, mce_next_interval); /* in jiffies */ --static DEFINE_PER_CPU(struct timer_list, mce_timer); -+static DEFINE_PER_CPU(struct hrtimer, mce_timer); - - static unsigned long mce_adjust_timer_default(unsigned long interval) - { -@@ -1249,32 +1251,18 @@ static unsigned long mce_adjust_timer_default(unsigned long interval) - - static unsigned long (*mce_adjust_timer)(unsigned long interval) = mce_adjust_timer_default; - --static void __restart_timer(struct timer_list *t, unsigned long interval) -+static enum hrtimer_restart __restart_timer(struct hrtimer *timer, unsigned long interval) - { -- unsigned long when = jiffies + interval; -- unsigned long flags; -- -- local_irq_save(flags); -- -- if (timer_pending(t)) { -- if (time_before(when, t->expires)) -- mod_timer_pinned(t, when); -- } else { -- t->expires = round_jiffies(when); -- add_timer_on(t, smp_processor_id()); -- } -- -- local_irq_restore(flags); -+ if (!interval) -+ return HRTIMER_NORESTART; -+ hrtimer_forward_now(timer, ns_to_ktime(jiffies_to_nsecs(interval))); -+ return HRTIMER_RESTART; - } - --static void mce_timer_fn(unsigned long data) -+static enum hrtimer_restart mce_timer_fn(struct hrtimer *timer) - { -- struct timer_list *t = this_cpu_ptr(&mce_timer); -- int cpu = smp_processor_id(); - unsigned long iv; - -- WARN_ON(cpu != data); -- - iv = __this_cpu_read(mce_next_interval); - - if (mce_available(this_cpu_ptr(&cpu_info))) { -@@ -1297,7 +1285,7 @@ static void mce_timer_fn(unsigned long data) - - done: - __this_cpu_write(mce_next_interval, iv); -- __restart_timer(t, iv); -+ return __restart_timer(timer, iv); - } - - /* -@@ -1305,7 +1293,7 @@ static void mce_timer_fn(unsigned long data) - */ - void mce_timer_kick(unsigned long interval) - { -- struct timer_list *t = this_cpu_ptr(&mce_timer); -+ struct hrtimer *t = this_cpu_ptr(&mce_timer); - unsigned long iv = __this_cpu_read(mce_next_interval); - - __restart_timer(t, interval); -@@ -1320,7 +1308,7 @@ static void mce_timer_delete_all(void) - int cpu; - - for_each_online_cpu(cpu) -- del_timer_sync(&per_cpu(mce_timer, cpu)); -+ hrtimer_cancel(&per_cpu(mce_timer, cpu)); - } - - static void mce_do_trigger(struct work_struct *work) -@@ -1330,6 +1318,56 @@ static void mce_do_trigger(struct work_struct *work) - - static DECLARE_WORK(mce_trigger_work, mce_do_trigger); - -+static void __mce_notify_work(struct swork_event *event) -+{ -+ /* Not more than two messages every minute */ -+ static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2); -+ -+ /* wake processes polling /dev/mcelog */ -+ wake_up_interruptible(&mce_chrdev_wait); -+ -+ /* -+ * There is no risk of missing notifications because -+ * work_pending is always cleared before the function is -+ * executed. -+ */ -+ if (mce_helper[0] && !work_pending(&mce_trigger_work)) -+ schedule_work(&mce_trigger_work); -+ -+ if (__ratelimit(&ratelimit)) -+ pr_info(HW_ERR "Machine check events logged\n"); -+} -+ -+#ifdef CONFIG_PREEMPT_RT_FULL -+static bool notify_work_ready __read_mostly; -+static struct swork_event notify_work; -+ -+static int mce_notify_work_init(void) -+{ -+ int err; -+ -+ err = swork_get(); -+ if (err) -+ return err; -+ -+ INIT_SWORK(¬ify_work, __mce_notify_work); -+ notify_work_ready = true; -+ return 0; -+} -+ -+static void mce_notify_work(void) -+{ -+ if (notify_work_ready) -+ swork_queue(¬ify_work); -+} -+#else -+static void mce_notify_work(void) -+{ -+ __mce_notify_work(NULL); -+} -+static inline int mce_notify_work_init(void) { return 0; } -+#endif -+ - /* - * Notify the user(s) about new machine check events. - * Can be called from interrupt context, but not from machine check/NMI -@@ -1337,19 +1375,8 @@ static DECLARE_WORK(mce_trigger_work, mce_do_trigger); - */ - int mce_notify_irq(void) - { -- /* Not more than two messages every minute */ -- static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2); -- - if (test_and_clear_bit(0, &mce_need_notify)) { -- /* wake processes polling /dev/mcelog */ -- wake_up_interruptible(&mce_chrdev_wait); -- -- if (mce_helper[0]) -- schedule_work(&mce_trigger_work); -- -- if (__ratelimit(&ratelimit)) -- pr_info(HW_ERR "Machine check events logged\n"); -- -+ mce_notify_work(); - return 1; - } - return 0; -@@ -1654,7 +1681,7 @@ static void __mcheck_cpu_clear_vendor(struct cpuinfo_x86 *c) - } - } - --static void mce_start_timer(unsigned int cpu, struct timer_list *t) -+static void mce_start_timer(unsigned int cpu, struct hrtimer *t) - { - unsigned long iv = check_interval * HZ; - -@@ -1663,16 +1690,17 @@ static void mce_start_timer(unsigned int cpu, struct timer_list *t) - - per_cpu(mce_next_interval, cpu) = iv; - -- t->expires = round_jiffies(jiffies + iv); -- add_timer_on(t, cpu); -+ hrtimer_start_range_ns(t, ns_to_ktime(jiffies_to_usecs(iv) * 1000ULL), -+ 0, HRTIMER_MODE_REL_PINNED); - } - - static void __mcheck_cpu_init_timer(void) - { -- struct timer_list *t = this_cpu_ptr(&mce_timer); -+ struct hrtimer *t = this_cpu_ptr(&mce_timer); - unsigned int cpu = smp_processor_id(); - -- setup_timer(t, mce_timer_fn, cpu); -+ hrtimer_init(t, CLOCK_MONOTONIC, HRTIMER_MODE_REL); -+ t->function = mce_timer_fn; - mce_start_timer(cpu, t); - } - -@@ -2393,6 +2421,8 @@ static void mce_disable_cpu(void *h) - if (!mce_available(raw_cpu_ptr(&cpu_info))) - return; - -+ hrtimer_cancel(this_cpu_ptr(&mce_timer)); -+ - if (!(action & CPU_TASKS_FROZEN)) - cmci_clear(); - -@@ -2415,6 +2445,7 @@ static void mce_reenable_cpu(void *h) - if (b->init) - wrmsrl(MSR_IA32_MCx_CTL(i), b->ctl); - } -+ __mcheck_cpu_init_timer(); - } - - /* Get notified when a cpu comes on/off. Be hotplug friendly. */ -@@ -2422,7 +2453,6 @@ static int - mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) - { - unsigned int cpu = (unsigned long)hcpu; -- struct timer_list *t = &per_cpu(mce_timer, cpu); - - switch (action & ~CPU_TASKS_FROZEN) { - case CPU_ONLINE: -@@ -2442,11 +2472,9 @@ mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) - break; - case CPU_DOWN_PREPARE: - smp_call_function_single(cpu, mce_disable_cpu, &action, 1); -- del_timer_sync(t); - break; - case CPU_DOWN_FAILED: - smp_call_function_single(cpu, mce_reenable_cpu, &action, 1); -- mce_start_timer(cpu, t); - break; - } - -@@ -2485,6 +2513,10 @@ static __init int mcheck_init_device(void) - goto err_out; - } - -+ err = mce_notify_work_init(); -+ if (err) -+ goto err_out; -+ - if (!zalloc_cpumask_var(&mce_device_initialized, GFP_KERNEL)) { - err = -ENOMEM; - goto err_out; -diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c -index 464ffd69b92e..00db1aad1548 100644 ---- a/arch/x86/kernel/dumpstack_32.c -+++ b/arch/x86/kernel/dumpstack_32.c -@@ -42,7 +42,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs, - unsigned long *stack, unsigned long bp, - const struct stacktrace_ops *ops, void *data) - { -- const unsigned cpu = get_cpu(); -+ const unsigned cpu = get_cpu_light(); - int graph = 0; - u32 *prev_esp; - -@@ -86,7 +86,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs, - break; - touch_nmi_watchdog(); - } -- put_cpu(); -+ put_cpu_light(); - } - EXPORT_SYMBOL(dump_trace); - -diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c -index 5f1c6266eb30..c331e3fef465 100644 ---- a/arch/x86/kernel/dumpstack_64.c -+++ b/arch/x86/kernel/dumpstack_64.c -@@ -152,7 +152,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs, - unsigned long *stack, unsigned long bp, - const struct stacktrace_ops *ops, void *data) - { -- const unsigned cpu = get_cpu(); -+ const unsigned cpu = get_cpu_light(); - struct thread_info *tinfo; - unsigned long *irq_stack = (unsigned long *)per_cpu(irq_stack_ptr, cpu); - unsigned long dummy; -@@ -241,7 +241,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs, - * This handles the process stack: - */ - bp = ops->walk_stack(tinfo, stack, bp, ops, data, NULL, &graph); -- put_cpu(); -+ put_cpu_light(); - } - EXPORT_SYMBOL(dump_trace); - -@@ -255,7 +255,7 @@ show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, - int cpu; - int i; - -- preempt_disable(); -+ migrate_disable(); - cpu = smp_processor_id(); - - irq_stack_end = (unsigned long *)(per_cpu(irq_stack_ptr, cpu)); -@@ -291,7 +291,7 @@ show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, - pr_cont(" %016lx", *stack++); - touch_nmi_watchdog(); - } -- preempt_enable(); -+ migrate_enable(); - - pr_cont("\n"); - show_trace_log_lvl(task, regs, sp, bp, log_lvl); -diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c -index 38da8f29a9c8..ce71f7098f15 100644 ---- a/arch/x86/kernel/irq_32.c -+++ b/arch/x86/kernel/irq_32.c -@@ -128,6 +128,7 @@ void irq_ctx_init(int cpu) - cpu, per_cpu(hardirq_stack, cpu), per_cpu(softirq_stack, cpu)); - } - -+#ifndef CONFIG_PREEMPT_RT_FULL - void do_softirq_own_stack(void) - { - struct thread_info *curstk; -@@ -146,6 +147,7 @@ void do_softirq_own_stack(void) - - call_on_stack(__do_softirq, isp); - } -+#endif - - bool handle_irq(struct irq_desc *desc, struct pt_regs *regs) - { -diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c -index 9f950917528b..4dd4beae917a 100644 ---- a/arch/x86/kernel/process_32.c -+++ b/arch/x86/kernel/process_32.c -@@ -35,6 +35,7 @@ - #include <linux/uaccess.h> - #include <linux/io.h> - #include <linux/kdebug.h> -+#include <linux/highmem.h> - - #include <asm/pgtable.h> - #include <asm/ldt.h> -@@ -210,6 +211,35 @@ start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp) - } - EXPORT_SYMBOL_GPL(start_thread); - -+#ifdef CONFIG_PREEMPT_RT_FULL -+static void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p) -+{ -+ int i; -+ -+ /* -+ * Clear @prev's kmap_atomic mappings -+ */ -+ for (i = 0; i < prev_p->kmap_idx; i++) { -+ int idx = i + KM_TYPE_NR * smp_processor_id(); -+ pte_t *ptep = kmap_pte - idx; -+ -+ kpte_clear_flush(ptep, __fix_to_virt(FIX_KMAP_BEGIN + idx)); -+ } -+ /* -+ * Restore @next_p's kmap_atomic mappings -+ */ -+ for (i = 0; i < next_p->kmap_idx; i++) { -+ int idx = i + KM_TYPE_NR * smp_processor_id(); -+ -+ if (!pte_none(next_p->kmap_pte[i])) -+ set_pte(kmap_pte - idx, next_p->kmap_pte[i]); -+ } -+} -+#else -+static inline void -+switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p) { } -+#endif -+ - - /* - * switch_to(x,y) should switch tasks from x to y. -@@ -286,6 +316,8 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) - task_thread_info(next_p)->flags & _TIF_WORK_CTXSW_NEXT)) - __switch_to_xtra(prev_p, next_p, tss); - -+ switch_kmaps(prev_p, next_p); -+ - /* - * Leave lazy mode, flushing any hypercalls made here. - * This must be done before restoring TLS segments so -diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c -index 1a2da0e5a373..a0c78a291f02 100644 ---- a/arch/x86/kvm/lapic.c -+++ b/arch/x86/kvm/lapic.c -@@ -1870,6 +1870,7 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu) - hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC, - HRTIMER_MODE_ABS_PINNED); - apic->lapic_timer.timer.function = apic_timer_fn; -+ apic->lapic_timer.timer.irqsafe = 1; - - /* - * APIC is created enabled. This will prevent kvm_lapic_set_base from -diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c -index 6b9701babaa1..9da12e3ebcc5 100644 ---- a/arch/x86/kvm/x86.c -+++ b/arch/x86/kvm/x86.c -@@ -5855,6 +5855,13 @@ int kvm_arch_init(void *opaque) - goto out; - } - -+#ifdef CONFIG_PREEMPT_RT_FULL -+ if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) { -+ printk(KERN_ERR "RT requires X86_FEATURE_CONSTANT_TSC\n"); -+ return -EOPNOTSUPP; -+ } -+#endif -+ - r = kvm_mmu_module_init(); - if (r) - goto out_free_percpu; -diff --git a/arch/x86/mm/highmem_32.c b/arch/x86/mm/highmem_32.c -index a6d739258137..bd24ba1c4a86 100644 ---- a/arch/x86/mm/highmem_32.c -+++ b/arch/x86/mm/highmem_32.c -@@ -32,10 +32,11 @@ EXPORT_SYMBOL(kunmap); - */ - void *kmap_atomic_prot(struct page *page, pgprot_t prot) - { -+ pte_t pte = mk_pte(page, prot); - unsigned long vaddr; - int idx, type; - -- preempt_disable(); -+ preempt_disable_nort(); - pagefault_disable(); - - if (!PageHighMem(page)) -@@ -45,7 +46,10 @@ void *kmap_atomic_prot(struct page *page, pgprot_t prot) - idx = type + KM_TYPE_NR*smp_processor_id(); - vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); - BUG_ON(!pte_none(*(kmap_pte-idx))); -- set_pte(kmap_pte-idx, mk_pte(page, prot)); -+#ifdef CONFIG_PREEMPT_RT_FULL -+ current->kmap_pte[type] = pte; -+#endif -+ set_pte(kmap_pte-idx, pte); - arch_flush_lazy_mmu_mode(); - - return (void *)vaddr; -@@ -88,6 +92,9 @@ void __kunmap_atomic(void *kvaddr) - * is a bad idea also, in case the page changes cacheability - * attributes or becomes a protected page in a hypervisor. - */ -+#ifdef CONFIG_PREEMPT_RT_FULL -+ current->kmap_pte[type] = __pte(0); -+#endif - kpte_clear_flush(kmap_pte-idx, vaddr); - kmap_atomic_idx_pop(); - arch_flush_lazy_mmu_mode(); -@@ -100,7 +107,7 @@ void __kunmap_atomic(void *kvaddr) - #endif - - pagefault_enable(); -- preempt_enable(); -+ preempt_enable_nort(); - } - EXPORT_SYMBOL(__kunmap_atomic); - -diff --git a/arch/x86/mm/iomap_32.c b/arch/x86/mm/iomap_32.c -index 9c0ff045fdd4..dd25dd1671b6 100644 ---- a/arch/x86/mm/iomap_32.c -+++ b/arch/x86/mm/iomap_32.c -@@ -56,6 +56,7 @@ EXPORT_SYMBOL_GPL(iomap_free); - - void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot) - { -+ pte_t pte = pfn_pte(pfn, prot); - unsigned long vaddr; - int idx, type; - -@@ -65,7 +66,12 @@ void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot) - type = kmap_atomic_idx_push(); - idx = type + KM_TYPE_NR * smp_processor_id(); - vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); -- set_pte(kmap_pte - idx, pfn_pte(pfn, prot)); -+ WARN_ON(!pte_none(*(kmap_pte - idx))); -+ -+#ifdef CONFIG_PREEMPT_RT_FULL -+ current->kmap_pte[type] = pte; -+#endif -+ set_pte(kmap_pte - idx, pte); - arch_flush_lazy_mmu_mode(); - - return (void *)vaddr; -@@ -113,6 +119,9 @@ iounmap_atomic(void __iomem *kvaddr) - * is a bad idea also, in case the page changes cacheability - * attributes or becomes a protected page in a hypervisor. - */ -+#ifdef CONFIG_PREEMPT_RT_FULL -+ current->kmap_pte[type] = __pte(0); -+#endif - kpte_clear_flush(kmap_pte-idx, vaddr); - kmap_atomic_idx_pop(); - } -diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c -index 3b6ec42718e4..7871083de089 100644 ---- a/arch/x86/platform/uv/tlb_uv.c -+++ b/arch/x86/platform/uv/tlb_uv.c -@@ -714,9 +714,9 @@ static void destination_plugged(struct bau_desc *bau_desc, - - quiesce_local_uvhub(hmaster); - -- spin_lock(&hmaster->queue_lock); -+ raw_spin_lock(&hmaster->queue_lock); - reset_with_ipi(&bau_desc->distribution, bcp); -- spin_unlock(&hmaster->queue_lock); -+ raw_spin_unlock(&hmaster->queue_lock); - - end_uvhub_quiesce(hmaster); - -@@ -736,9 +736,9 @@ static void destination_timeout(struct bau_desc *bau_desc, - - quiesce_local_uvhub(hmaster); - -- spin_lock(&hmaster->queue_lock); -+ raw_spin_lock(&hmaster->queue_lock); - reset_with_ipi(&bau_desc->distribution, bcp); -- spin_unlock(&hmaster->queue_lock); -+ raw_spin_unlock(&hmaster->queue_lock); - - end_uvhub_quiesce(hmaster); - -@@ -759,7 +759,7 @@ static void disable_for_period(struct bau_control *bcp, struct ptc_stats *stat) - cycles_t tm1; - - hmaster = bcp->uvhub_master; -- spin_lock(&hmaster->disable_lock); -+ raw_spin_lock(&hmaster->disable_lock); - if (!bcp->baudisabled) { - stat->s_bau_disabled++; - tm1 = get_cycles(); -@@ -772,7 +772,7 @@ static void disable_for_period(struct bau_control *bcp, struct ptc_stats *stat) - } - } - } -- spin_unlock(&hmaster->disable_lock); -+ raw_spin_unlock(&hmaster->disable_lock); - } - - static void count_max_concurr(int stat, struct bau_control *bcp, -@@ -835,7 +835,7 @@ static void record_send_stats(cycles_t time1, cycles_t time2, - */ - static void uv1_throttle(struct bau_control *hmaster, struct ptc_stats *stat) - { -- spinlock_t *lock = &hmaster->uvhub_lock; -+ raw_spinlock_t *lock = &hmaster->uvhub_lock; - atomic_t *v; - - v = &hmaster->active_descriptor_count; -@@ -968,7 +968,7 @@ static int check_enable(struct bau_control *bcp, struct ptc_stats *stat) - struct bau_control *hmaster; - - hmaster = bcp->uvhub_master; -- spin_lock(&hmaster->disable_lock); -+ raw_spin_lock(&hmaster->disable_lock); - if (bcp->baudisabled && (get_cycles() >= bcp->set_bau_on_time)) { - stat->s_bau_reenabled++; - for_each_present_cpu(tcpu) { -@@ -980,10 +980,10 @@ static int check_enable(struct bau_control *bcp, struct ptc_stats *stat) - tbcp->period_giveups = 0; - } - } -- spin_unlock(&hmaster->disable_lock); -+ raw_spin_unlock(&hmaster->disable_lock); - return 0; - } -- spin_unlock(&hmaster->disable_lock); -+ raw_spin_unlock(&hmaster->disable_lock); - return -1; - } - -@@ -1901,9 +1901,9 @@ static void __init init_per_cpu_tunables(void) - bcp->cong_reps = congested_reps; - bcp->disabled_period = sec_2_cycles(disabled_period); - bcp->giveup_limit = giveup_limit; -- spin_lock_init(&bcp->queue_lock); -- spin_lock_init(&bcp->uvhub_lock); -- spin_lock_init(&bcp->disable_lock); -+ raw_spin_lock_init(&bcp->queue_lock); -+ raw_spin_lock_init(&bcp->uvhub_lock); -+ raw_spin_lock_init(&bcp->disable_lock); - } - } - -diff --git a/arch/x86/platform/uv/uv_time.c b/arch/x86/platform/uv/uv_time.c -index 2b158a9fa1d7..5e0b122620cb 100644 ---- a/arch/x86/platform/uv/uv_time.c -+++ b/arch/x86/platform/uv/uv_time.c -@@ -57,7 +57,7 @@ static DEFINE_PER_CPU(struct clock_event_device, cpu_ced); - - /* There is one of these allocated per node */ - struct uv_rtc_timer_head { -- spinlock_t lock; -+ raw_spinlock_t lock; - /* next cpu waiting for timer, local node relative: */ - int next_cpu; - /* number of cpus on this node: */ -@@ -177,7 +177,7 @@ static __init int uv_rtc_allocate_timers(void) - uv_rtc_deallocate_timers(); - return -ENOMEM; - } -- spin_lock_init(&head->lock); -+ raw_spin_lock_init(&head->lock); - head->ncpus = uv_blade_nr_possible_cpus(bid); - head->next_cpu = -1; - blade_info[bid] = head; -@@ -231,7 +231,7 @@ static int uv_rtc_set_timer(int cpu, u64 expires) - unsigned long flags; - int next_cpu; - -- spin_lock_irqsave(&head->lock, flags); -+ raw_spin_lock_irqsave(&head->lock, flags); - - next_cpu = head->next_cpu; - *t = expires; -@@ -243,12 +243,12 @@ static int uv_rtc_set_timer(int cpu, u64 expires) - if (uv_setup_intr(cpu, expires)) { - *t = ULLONG_MAX; - uv_rtc_find_next_timer(head, pnode); -- spin_unlock_irqrestore(&head->lock, flags); -+ raw_spin_unlock_irqrestore(&head->lock, flags); - return -ETIME; - } - } - -- spin_unlock_irqrestore(&head->lock, flags); -+ raw_spin_unlock_irqrestore(&head->lock, flags); - return 0; - } - -@@ -267,7 +267,7 @@ static int uv_rtc_unset_timer(int cpu, int force) - unsigned long flags; - int rc = 0; - -- spin_lock_irqsave(&head->lock, flags); -+ raw_spin_lock_irqsave(&head->lock, flags); - - if ((head->next_cpu == bcpu && uv_read_rtc(NULL) >= *t) || force) - rc = 1; -@@ -279,7 +279,7 @@ static int uv_rtc_unset_timer(int cpu, int force) - uv_rtc_find_next_timer(head, pnode); - } - -- spin_unlock_irqrestore(&head->lock, flags); -+ raw_spin_unlock_irqrestore(&head->lock, flags); - - return rc; - } -@@ -299,13 +299,18 @@ static int uv_rtc_unset_timer(int cpu, int force) - static cycle_t uv_read_rtc(struct clocksource *cs) - { - unsigned long offset; -+ cycle_t cycles; - -+ preempt_disable(); - if (uv_get_min_hub_revision_id() == 1) - offset = 0; - else - offset = (uv_blade_processor_id() * L1_CACHE_BYTES) % PAGE_SIZE; - -- return (cycle_t)uv_read_local_mmr(UVH_RTC | offset); -+ cycles = (cycle_t)uv_read_local_mmr(UVH_RTC | offset); -+ preempt_enable(); -+ -+ return cycles; - } - - /* -diff --git a/block/blk-core.c b/block/blk-core.c -index b60537b2c35b..b9bdc9d0262d 100644 ---- a/block/blk-core.c -+++ b/block/blk-core.c -@@ -125,6 +125,9 @@ void blk_rq_init(struct request_queue *q, struct request *rq) - - INIT_LIST_HEAD(&rq->queuelist); - INIT_LIST_HEAD(&rq->timeout_list); -+#ifdef CONFIG_PREEMPT_RT_FULL -+ INIT_WORK(&rq->work, __blk_mq_complete_request_remote_work); -+#endif - rq->cpu = -1; - rq->q = q; - rq->__sector = (sector_t) -1; -@@ -233,7 +236,7 @@ EXPORT_SYMBOL(blk_start_queue_async); - **/ - void blk_start_queue(struct request_queue *q) - { -- WARN_ON(!irqs_disabled()); -+ WARN_ON_NONRT(!irqs_disabled()); - - queue_flag_clear(QUEUE_FLAG_STOPPED, q); - __blk_run_queue(q); -@@ -657,7 +660,7 @@ int blk_queue_enter(struct request_queue *q, bool nowait) - if (nowait) - return -EBUSY; - -- ret = wait_event_interruptible(q->mq_freeze_wq, -+ ret = swait_event_interruptible(q->mq_freeze_wq, - !atomic_read(&q->mq_freeze_depth) || - blk_queue_dying(q)); - if (blk_queue_dying(q)) -@@ -677,7 +680,7 @@ static void blk_queue_usage_counter_release(struct percpu_ref *ref) - struct request_queue *q = - container_of(ref, struct request_queue, q_usage_counter); - -- wake_up_all(&q->mq_freeze_wq); -+ swake_up_all(&q->mq_freeze_wq); - } - - static void blk_rq_timed_out_timer(unsigned long data) -@@ -746,7 +749,7 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id) - q->bypass_depth = 1; - __set_bit(QUEUE_FLAG_BYPASS, &q->queue_flags); - -- init_waitqueue_head(&q->mq_freeze_wq); -+ init_swait_queue_head(&q->mq_freeze_wq); - - /* - * Init percpu_ref in atomic mode so that it's faster to shutdown. -@@ -3209,7 +3212,7 @@ static void queue_unplugged(struct request_queue *q, unsigned int depth, - blk_run_queue_async(q); - else - __blk_run_queue(q); -- spin_unlock(q->queue_lock); -+ spin_unlock_irq(q->queue_lock); - } - - static void flush_plug_callbacks(struct blk_plug *plug, bool from_schedule) -@@ -3257,7 +3260,6 @@ EXPORT_SYMBOL(blk_check_plugged); - void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule) - { - struct request_queue *q; -- unsigned long flags; - struct request *rq; - LIST_HEAD(list); - unsigned int depth; -@@ -3277,11 +3279,6 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule) - q = NULL; - depth = 0; - -- /* -- * Save and disable interrupts here, to avoid doing it for every -- * queue lock we have to take. -- */ -- local_irq_save(flags); - while (!list_empty(&list)) { - rq = list_entry_rq(list.next); - list_del_init(&rq->queuelist); -@@ -3294,7 +3291,7 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule) - queue_unplugged(q, depth, from_schedule); - q = rq->q; - depth = 0; -- spin_lock(q->queue_lock); -+ spin_lock_irq(q->queue_lock); - } - - /* -@@ -3321,8 +3318,6 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule) - */ - if (q) - queue_unplugged(q, depth, from_schedule); -- -- local_irq_restore(flags); - } - - void blk_finish_plug(struct blk_plug *plug) -diff --git a/block/blk-ioc.c b/block/blk-ioc.c -index 381cb50a673c..dc8785233d94 100644 ---- a/block/blk-ioc.c -+++ b/block/blk-ioc.c -@@ -7,6 +7,7 @@ - #include <linux/bio.h> - #include <linux/blkdev.h> - #include <linux/slab.h> -+#include <linux/delay.h> - - #include "blk.h" - -@@ -109,7 +110,7 @@ static void ioc_release_fn(struct work_struct *work) - spin_unlock(q->queue_lock); - } else { - spin_unlock_irqrestore(&ioc->lock, flags); -- cpu_relax(); -+ cpu_chill(); - spin_lock_irqsave_nested(&ioc->lock, flags, 1); - } - } -@@ -187,7 +188,7 @@ void put_io_context_active(struct io_context *ioc) - spin_unlock(icq->q->queue_lock); - } else { - spin_unlock_irqrestore(&ioc->lock, flags); -- cpu_relax(); -+ cpu_chill(); - goto retry; - } - } -diff --git a/block/blk-mq-cpu.c b/block/blk-mq-cpu.c -index bb3ed488f7b5..628c6c13c482 100644 ---- a/block/blk-mq-cpu.c -+++ b/block/blk-mq-cpu.c -@@ -16,7 +16,7 @@ - #include "blk-mq.h" - - static LIST_HEAD(blk_mq_cpu_notify_list); --static DEFINE_RAW_SPINLOCK(blk_mq_cpu_notify_lock); -+static DEFINE_SPINLOCK(blk_mq_cpu_notify_lock); - - static int blk_mq_main_cpu_notify(struct notifier_block *self, - unsigned long action, void *hcpu) -@@ -25,7 +25,10 @@ static int blk_mq_main_cpu_notify(struct notifier_block *self, - struct blk_mq_cpu_notifier *notify; - int ret = NOTIFY_OK; - -- raw_spin_lock(&blk_mq_cpu_notify_lock); -+ if (action != CPU_POST_DEAD) -+ return NOTIFY_OK; -+ -+ spin_lock(&blk_mq_cpu_notify_lock); - - list_for_each_entry(notify, &blk_mq_cpu_notify_list, list) { - ret = notify->notify(notify->data, action, cpu); -@@ -33,7 +36,7 @@ static int blk_mq_main_cpu_notify(struct notifier_block *self, - break; - } - -- raw_spin_unlock(&blk_mq_cpu_notify_lock); -+ spin_unlock(&blk_mq_cpu_notify_lock); - return ret; - } - -@@ -41,16 +44,16 @@ void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier) - { - BUG_ON(!notifier->notify); - -- raw_spin_lock(&blk_mq_cpu_notify_lock); -+ spin_lock(&blk_mq_cpu_notify_lock); - list_add_tail(¬ifier->list, &blk_mq_cpu_notify_list); -- raw_spin_unlock(&blk_mq_cpu_notify_lock); -+ spin_unlock(&blk_mq_cpu_notify_lock); - } - - void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier) - { -- raw_spin_lock(&blk_mq_cpu_notify_lock); -+ spin_lock(&blk_mq_cpu_notify_lock); - list_del(¬ifier->list); -- raw_spin_unlock(&blk_mq_cpu_notify_lock); -+ spin_unlock(&blk_mq_cpu_notify_lock); - } - - void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier, -diff --git a/block/blk-mq.c b/block/blk-mq.c -index 1699baf39b78..2a2006009548 100644 ---- a/block/blk-mq.c -+++ b/block/blk-mq.c -@@ -92,7 +92,7 @@ EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_start); - - static void blk_mq_freeze_queue_wait(struct request_queue *q) - { -- wait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->q_usage_counter)); -+ swait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->q_usage_counter)); - } - - /* -@@ -130,7 +130,7 @@ void blk_mq_unfreeze_queue(struct request_queue *q) - WARN_ON_ONCE(freeze_depth < 0); - if (!freeze_depth) { - percpu_ref_reinit(&q->q_usage_counter); -- wake_up_all(&q->mq_freeze_wq); -+ swake_up_all(&q->mq_freeze_wq); - } - } - EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue); -@@ -149,7 +149,7 @@ void blk_mq_wake_waiters(struct request_queue *q) - * dying, we need to ensure that processes currently waiting on - * the queue are notified as well. - */ -- wake_up_all(&q->mq_freeze_wq); -+ swake_up_all(&q->mq_freeze_wq); - } - - bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx) -@@ -196,6 +196,9 @@ static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx, - rq->resid_len = 0; - rq->sense = NULL; - -+#ifdef CONFIG_PREEMPT_RT_FULL -+ INIT_WORK(&rq->work, __blk_mq_complete_request_remote_work); -+#endif - INIT_LIST_HEAD(&rq->timeout_list); - rq->timeout = 0; - -@@ -323,6 +326,17 @@ void blk_mq_end_request(struct request *rq, int error) - } - EXPORT_SYMBOL(blk_mq_end_request); - -+#ifdef CONFIG_PREEMPT_RT_FULL -+ -+void __blk_mq_complete_request_remote_work(struct work_struct *work) -+{ -+ struct request *rq = container_of(work, struct request, work); -+ -+ rq->q->softirq_done_fn(rq); -+} -+ -+#else -+ - static void __blk_mq_complete_request_remote(void *data) - { - struct request *rq = data; -@@ -330,6 +344,8 @@ static void __blk_mq_complete_request_remote(void *data) - rq->q->softirq_done_fn(rq); - } - -+#endif -+ - static void blk_mq_ipi_complete_request(struct request *rq) - { - struct blk_mq_ctx *ctx = rq->mq_ctx; -@@ -341,19 +357,23 @@ static void blk_mq_ipi_complete_request(struct request *rq) - return; - } - -- cpu = get_cpu(); -+ cpu = get_cpu_light(); - if (!test_bit(QUEUE_FLAG_SAME_FORCE, &rq->q->queue_flags)) - shared = cpus_share_cache(cpu, ctx->cpu); - - if (cpu != ctx->cpu && !shared && cpu_online(ctx->cpu)) { -+#ifdef CONFIG_PREEMPT_RT_FULL -+ schedule_work_on(ctx->cpu, &rq->work); -+#else - rq->csd.func = __blk_mq_complete_request_remote; - rq->csd.info = rq; - rq->csd.flags = 0; - smp_call_function_single_async(ctx->cpu, &rq->csd); -+#endif - } else { - rq->q->softirq_done_fn(rq); - } -- put_cpu(); -+ put_cpu_light(); - } - - static void __blk_mq_complete_request(struct request *rq) -@@ -868,14 +888,14 @@ void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async) - return; - - if (!async) { -- int cpu = get_cpu(); -+ int cpu = get_cpu_light(); - if (cpumask_test_cpu(cpu, hctx->cpumask)) { - __blk_mq_run_hw_queue(hctx); -- put_cpu(); -+ put_cpu_light(); - return; - } - -- put_cpu(); -+ put_cpu_light(); - } - - kblockd_schedule_delayed_work_on(blk_mq_hctx_next_cpu(hctx), -@@ -1621,7 +1641,7 @@ static int blk_mq_hctx_notify(void *data, unsigned long action, - { - struct blk_mq_hw_ctx *hctx = data; - -- if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) -+ if (action == CPU_POST_DEAD) - return blk_mq_hctx_cpu_offline(hctx, cpu); - - /* -diff --git a/block/blk-mq.h b/block/blk-mq.h -index 9087b11037b7..0401d76e827c 100644 ---- a/block/blk-mq.h -+++ b/block/blk-mq.h -@@ -86,12 +86,12 @@ static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q, - */ - static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q) - { -- return __blk_mq_get_ctx(q, get_cpu()); -+ return __blk_mq_get_ctx(q, get_cpu_light()); - } - - static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx) - { -- put_cpu(); -+ put_cpu_light(); - } - - struct blk_mq_alloc_data { -diff --git a/block/blk-softirq.c b/block/blk-softirq.c -index 53b1737e978d..81c3c0a62edf 100644 ---- a/block/blk-softirq.c -+++ b/block/blk-softirq.c -@@ -51,6 +51,7 @@ static void trigger_softirq(void *data) - raise_softirq_irqoff(BLOCK_SOFTIRQ); - - local_irq_restore(flags); -+ preempt_check_resched_rt(); - } - - /* -@@ -93,6 +94,7 @@ static int blk_cpu_notify(struct notifier_block *self, unsigned long action, - this_cpu_ptr(&blk_cpu_done)); - raise_softirq_irqoff(BLOCK_SOFTIRQ); - local_irq_enable(); -+ preempt_check_resched_rt(); - } - - return NOTIFY_OK; -@@ -150,6 +152,7 @@ void __blk_complete_request(struct request *req) - goto do_local; - - local_irq_restore(flags); -+ preempt_check_resched_rt(); - } - - /** -diff --git a/block/bounce.c b/block/bounce.c -index 1cb5dd3a5da1..2f1ec8a67cbe 100644 ---- a/block/bounce.c -+++ b/block/bounce.c -@@ -55,11 +55,11 @@ static void bounce_copy_vec(struct bio_vec *to, unsigned char *vfrom) - unsigned long flags; - unsigned char *vto; - -- local_irq_save(flags); -+ local_irq_save_nort(flags); - vto = kmap_atomic(to->bv_page); - memcpy(vto + to->bv_offset, vfrom, to->bv_len); - kunmap_atomic(vto); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - } - - #else /* CONFIG_HIGHMEM */ -diff --git a/block/genhd.c b/block/genhd.c -index 9f42526b4d62..f06d7f3b075b 100644 ---- a/block/genhd.c -+++ b/block/genhd.c -@@ -1523,12 +1523,7 @@ static void __disk_unblock_events(struct gendisk *disk, bool check_now) - if (--ev->block) - goto out_unlock; - -- /* -- * Not exactly a latency critical operation, set poll timer -- * slack to 25% and kick event check. -- */ - intv = disk_events_poll_jiffies(disk); -- set_timer_slack(&ev->dwork.timer, intv / 4); - if (check_now) - queue_delayed_work(system_freezable_power_efficient_wq, - &ev->dwork, 0); -diff --git a/crypto/algapi.c b/crypto/algapi.c -index 731255a6104f..d3380591dfdd 100644 ---- a/crypto/algapi.c -+++ b/crypto/algapi.c -@@ -718,13 +718,13 @@ EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); - - int crypto_register_notifier(struct notifier_block *nb) - { -- return blocking_notifier_chain_register(&crypto_chain, nb); -+ return srcu_notifier_chain_register(&crypto_chain, nb); - } - EXPORT_SYMBOL_GPL(crypto_register_notifier); - - int crypto_unregister_notifier(struct notifier_block *nb) - { -- return blocking_notifier_chain_unregister(&crypto_chain, nb); -+ return srcu_notifier_chain_unregister(&crypto_chain, nb); - } - EXPORT_SYMBOL_GPL(crypto_unregister_notifier); - -diff --git a/crypto/api.c b/crypto/api.c -index bbc147cb5dec..bc1a848f02ec 100644 ---- a/crypto/api.c -+++ b/crypto/api.c -@@ -31,7 +31,7 @@ EXPORT_SYMBOL_GPL(crypto_alg_list); - DECLARE_RWSEM(crypto_alg_sem); - EXPORT_SYMBOL_GPL(crypto_alg_sem); - --BLOCKING_NOTIFIER_HEAD(crypto_chain); -+SRCU_NOTIFIER_HEAD(crypto_chain); - EXPORT_SYMBOL_GPL(crypto_chain); - - static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg); -@@ -236,10 +236,10 @@ int crypto_probing_notify(unsigned long val, void *v) - { - int ok; - -- ok = blocking_notifier_call_chain(&crypto_chain, val, v); -+ ok = srcu_notifier_call_chain(&crypto_chain, val, v); - if (ok == NOTIFY_DONE) { - request_module("cryptomgr"); -- ok = blocking_notifier_call_chain(&crypto_chain, val, v); -+ ok = srcu_notifier_call_chain(&crypto_chain, val, v); - } - - return ok; -diff --git a/crypto/internal.h b/crypto/internal.h -index 7eefcdb00227..0ecc7f5a2f40 100644 ---- a/crypto/internal.h -+++ b/crypto/internal.h -@@ -47,7 +47,7 @@ struct crypto_larval { - - extern struct list_head crypto_alg_list; - extern struct rw_semaphore crypto_alg_sem; --extern struct blocking_notifier_head crypto_chain; -+extern struct srcu_notifier_head crypto_chain; - - #ifdef CONFIG_PROC_FS - void __init crypto_init_proc(void); -@@ -146,7 +146,7 @@ static inline int crypto_is_moribund(struct crypto_alg *alg) - - static inline void crypto_notify(unsigned long val, void *v) - { -- blocking_notifier_call_chain(&crypto_chain, val, v); -+ srcu_notifier_call_chain(&crypto_chain, val, v); - } - - #endif /* _CRYPTO_INTERNAL_H */ -diff --git a/drivers/acpi/acpica/acglobal.h b/drivers/acpi/acpica/acglobal.h -index 51b073b68f16..2d38ca5c6635 100644 ---- a/drivers/acpi/acpica/acglobal.h -+++ b/drivers/acpi/acpica/acglobal.h -@@ -116,7 +116,7 @@ ACPI_GLOBAL(u8, acpi_gbl_global_lock_pending); - * interrupt level - */ - ACPI_GLOBAL(acpi_spinlock, acpi_gbl_gpe_lock); /* For GPE data structs and registers */ --ACPI_GLOBAL(acpi_spinlock, acpi_gbl_hardware_lock); /* For ACPI H/W except GPE registers */ -+ACPI_GLOBAL(acpi_raw_spinlock, acpi_gbl_hardware_lock); /* For ACPI H/W except GPE registers */ - ACPI_GLOBAL(acpi_spinlock, acpi_gbl_reference_count_lock); - - /* Mutex for _OSI support */ -diff --git a/drivers/acpi/acpica/hwregs.c b/drivers/acpi/acpica/hwregs.c -index 5ba0498412fd..ada43191fb31 100644 ---- a/drivers/acpi/acpica/hwregs.c -+++ b/drivers/acpi/acpica/hwregs.c -@@ -269,14 +269,14 @@ acpi_status acpi_hw_clear_acpi_status(void) - ACPI_BITMASK_ALL_FIXED_STATUS, - ACPI_FORMAT_UINT64(acpi_gbl_xpm1a_status.address))); - -- lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); -+ raw_spin_lock_irqsave(acpi_gbl_hardware_lock, lock_flags); - - /* Clear the fixed events in PM1 A/B */ - - status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS, - ACPI_BITMASK_ALL_FIXED_STATUS); - -- acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags); -+ raw_spin_unlock_irqrestore(acpi_gbl_hardware_lock, lock_flags); - - if (ACPI_FAILURE(status)) { - goto exit; -diff --git a/drivers/acpi/acpica/hwxface.c b/drivers/acpi/acpica/hwxface.c -index a01ddb393a55..fb64afd9470b 100644 ---- a/drivers/acpi/acpica/hwxface.c -+++ b/drivers/acpi/acpica/hwxface.c -@@ -374,7 +374,7 @@ acpi_status acpi_write_bit_register(u32 register_id, u32 value) - return_ACPI_STATUS(AE_BAD_PARAMETER); - } - -- lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); -+ raw_spin_lock_irqsave(acpi_gbl_hardware_lock, lock_flags); - - /* - * At this point, we know that the parent register is one of the -@@ -435,7 +435,7 @@ acpi_status acpi_write_bit_register(u32 register_id, u32 value) - - unlock_and_exit: - -- acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags); -+ raw_spin_unlock_irqrestore(acpi_gbl_hardware_lock, lock_flags); - return_ACPI_STATUS(status); - } - -diff --git a/drivers/acpi/acpica/utmutex.c b/drivers/acpi/acpica/utmutex.c -index 15073375bd00..357e7ca5a587 100644 ---- a/drivers/acpi/acpica/utmutex.c -+++ b/drivers/acpi/acpica/utmutex.c -@@ -88,7 +88,7 @@ acpi_status acpi_ut_mutex_initialize(void) - return_ACPI_STATUS (status); - } - -- status = acpi_os_create_lock (&acpi_gbl_hardware_lock); -+ status = acpi_os_create_raw_lock (&acpi_gbl_hardware_lock); - if (ACPI_FAILURE (status)) { - return_ACPI_STATUS (status); - } -@@ -145,7 +145,7 @@ void acpi_ut_mutex_terminate(void) - /* Delete the spinlocks */ - - acpi_os_delete_lock(acpi_gbl_gpe_lock); -- acpi_os_delete_lock(acpi_gbl_hardware_lock); -+ acpi_os_delete_raw_lock(acpi_gbl_hardware_lock); - acpi_os_delete_lock(acpi_gbl_reference_count_lock); - - /* Delete the reader/writer lock */ -diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c -index 051b6158d1b7..7ad293bef6ed 100644 ---- a/drivers/ata/libata-sff.c -+++ b/drivers/ata/libata-sff.c -@@ -678,9 +678,9 @@ unsigned int ata_sff_data_xfer_noirq(struct ata_device *dev, unsigned char *buf, - unsigned long flags; - unsigned int consumed; - -- local_irq_save(flags); -+ local_irq_save_nort(flags); - consumed = ata_sff_data_xfer32(dev, buf, buflen, rw); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - - return consumed; - } -@@ -719,7 +719,7 @@ static void ata_pio_sector(struct ata_queued_cmd *qc) - unsigned long flags; - - /* FIXME: use a bounce buffer */ -- local_irq_save(flags); -+ local_irq_save_nort(flags); - buf = kmap_atomic(page); - - /* do the actual data transfer */ -@@ -727,7 +727,7 @@ static void ata_pio_sector(struct ata_queued_cmd *qc) - do_write); - - kunmap_atomic(buf); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - } else { - buf = page_address(page); - ap->ops->sff_data_xfer(qc->dev, buf + offset, qc->sect_size, -@@ -864,7 +864,7 @@ static int __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes) - unsigned long flags; - - /* FIXME: use bounce buffer */ -- local_irq_save(flags); -+ local_irq_save_nort(flags); - buf = kmap_atomic(page); - - /* do the actual data transfer */ -@@ -872,7 +872,7 @@ static int __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes) - count, rw); - - kunmap_atomic(buf); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - } else { - buf = page_address(page); - consumed = ap->ops->sff_data_xfer(dev, buf + offset, -diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c -index 370c2f76016d..65e0b375a291 100644 ---- a/drivers/block/zram/zram_drv.c -+++ b/drivers/block/zram/zram_drv.c -@@ -520,6 +520,8 @@ static struct zram_meta *zram_meta_alloc(char *pool_name, u64 disksize) - goto out_error; - } - -+ zram_meta_init_table_locks(meta, disksize); -+ - return meta; - - out_error: -@@ -568,12 +570,12 @@ static int zram_decompress_page(struct zram *zram, char *mem, u32 index) - unsigned long handle; - size_t size; - -- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value); -+ zram_lock_table(&meta->table[index]); - handle = meta->table[index].handle; - size = zram_get_obj_size(meta, index); - - if (!handle || zram_test_flag(meta, index, ZRAM_ZERO)) { -- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value); -+ zram_unlock_table(&meta->table[index]); - clear_page(mem); - return 0; - } -@@ -584,7 +586,7 @@ static int zram_decompress_page(struct zram *zram, char *mem, u32 index) - else - ret = zcomp_decompress(zram->comp, cmem, size, mem); - zs_unmap_object(meta->mem_pool, handle); -- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value); -+ zram_unlock_table(&meta->table[index]); - - /* Should NEVER happen. Return bio error if it does. */ - if (unlikely(ret)) { -@@ -604,14 +606,14 @@ static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec, - struct zram_meta *meta = zram->meta; - page = bvec->bv_page; - -- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value); -+ zram_lock_table(&meta->table[index]); - if (unlikely(!meta->table[index].handle) || - zram_test_flag(meta, index, ZRAM_ZERO)) { -- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value); -+ zram_unlock_table(&meta->table[index]); - handle_zero_page(bvec); - return 0; - } -- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value); -+ zram_unlock_table(&meta->table[index]); - - if (is_partial_io(bvec)) - /* Use a temporary buffer to decompress the page */ -@@ -689,10 +691,10 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index, - if (user_mem) - kunmap_atomic(user_mem); - /* Free memory associated with this sector now. */ -- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value); -+ zram_lock_table(&meta->table[index]); - zram_free_page(zram, index); - zram_set_flag(meta, index, ZRAM_ZERO); -- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value); -+ zram_unlock_table(&meta->table[index]); - - atomic64_inc(&zram->stats.zero_pages); - ret = 0; -@@ -752,12 +754,12 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index, - * Free memory associated with this sector - * before overwriting unused sectors. - */ -- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value); -+ zram_lock_table(&meta->table[index]); - zram_free_page(zram, index); - - meta->table[index].handle = handle; - zram_set_obj_size(meta, index, clen); -- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value); -+ zram_unlock_table(&meta->table[index]); - - /* Update stats */ - atomic64_add(clen, &zram->stats.compr_data_size); -@@ -800,9 +802,9 @@ static void zram_bio_discard(struct zram *zram, u32 index, - } - - while (n >= PAGE_SIZE) { -- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value); -+ zram_lock_table(&meta->table[index]); - zram_free_page(zram, index); -- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value); -+ zram_unlock_table(&meta->table[index]); - atomic64_inc(&zram->stats.notify_free); - index++; - n -= PAGE_SIZE; -@@ -928,9 +930,9 @@ static void zram_slot_free_notify(struct block_device *bdev, - zram = bdev->bd_disk->private_data; - meta = zram->meta; - -- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value); -+ zram_lock_table(&meta->table[index]); - zram_free_page(zram, index); -- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value); -+ zram_unlock_table(&meta->table[index]); - atomic64_inc(&zram->stats.notify_free); - } - -diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h -index 8e92339686d7..9e3e953d680e 100644 ---- a/drivers/block/zram/zram_drv.h -+++ b/drivers/block/zram/zram_drv.h -@@ -72,6 +72,9 @@ enum zram_pageflags { - struct zram_table_entry { - unsigned long handle; - unsigned long value; -+#ifdef CONFIG_PREEMPT_RT_BASE -+ spinlock_t lock; -+#endif - }; - - struct zram_stats { -@@ -119,4 +122,42 @@ struct zram { - */ - bool claim; /* Protected by bdev->bd_mutex */ - }; -+ -+#ifndef CONFIG_PREEMPT_RT_BASE -+static inline void zram_lock_table(struct zram_table_entry *table) -+{ -+ bit_spin_lock(ZRAM_ACCESS, &table->value); -+} -+ -+static inline void zram_unlock_table(struct zram_table_entry *table) -+{ -+ bit_spin_unlock(ZRAM_ACCESS, &table->value); -+} -+ -+static inline void zram_meta_init_table_locks(struct zram_meta *meta, u64 disksize) { } -+#else /* CONFIG_PREEMPT_RT_BASE */ -+static inline void zram_lock_table(struct zram_table_entry *table) -+{ -+ spin_lock(&table->lock); -+ __set_bit(ZRAM_ACCESS, &table->value); -+} -+ -+static inline void zram_unlock_table(struct zram_table_entry *table) -+{ -+ __clear_bit(ZRAM_ACCESS, &table->value); -+ spin_unlock(&table->lock); -+} -+ -+static inline void zram_meta_init_table_locks(struct zram_meta *meta, u64 disksize) -+{ -+ size_t num_pages = disksize >> PAGE_SHIFT; -+ size_t index; -+ -+ for (index = 0; index < num_pages; index++) { -+ spinlock_t *lock = &meta->table[index].lock; -+ spin_lock_init(lock); -+ } -+} -+#endif /* CONFIG_PREEMPT_RT_BASE */ -+ - #endif -diff --git a/drivers/char/random.c b/drivers/char/random.c -index b583e5336630..ac2bd8c62de9 100644 ---- a/drivers/char/random.c -+++ b/drivers/char/random.c -@@ -796,8 +796,6 @@ static void add_timer_randomness(struct timer_rand_state *state, unsigned num) - } sample; - long delta, delta2, delta3; - -- preempt_disable(); -- - sample.jiffies = jiffies; - sample.cycles = random_get_entropy(); - sample.num = num; -@@ -838,7 +836,6 @@ static void add_timer_randomness(struct timer_rand_state *state, unsigned num) - */ - credit_entropy_bits(r, min_t(int, fls(delta>>1), 11)); - } -- preempt_enable(); - } - - void add_input_randomness(unsigned int type, unsigned int code, -@@ -891,28 +888,27 @@ static __u32 get_reg(struct fast_pool *f, struct pt_regs *regs) - return *(ptr + f->reg_idx++); - } - --void add_interrupt_randomness(int irq, int irq_flags) -+void add_interrupt_randomness(int irq, int irq_flags, __u64 ip) - { - struct entropy_store *r; - struct fast_pool *fast_pool = this_cpu_ptr(&irq_randomness); -- struct pt_regs *regs = get_irq_regs(); - unsigned long now = jiffies; - cycles_t cycles = random_get_entropy(); - __u32 c_high, j_high; -- __u64 ip; - unsigned long seed; - int credit = 0; - - if (cycles == 0) -- cycles = get_reg(fast_pool, regs); -+ cycles = get_reg(fast_pool, NULL); - c_high = (sizeof(cycles) > 4) ? cycles >> 32 : 0; - j_high = (sizeof(now) > 4) ? now >> 32 : 0; - fast_pool->pool[0] ^= cycles ^ j_high ^ irq; - fast_pool->pool[1] ^= now ^ c_high; -- ip = regs ? instruction_pointer(regs) : _RET_IP_; -+ if (!ip) -+ ip = _RET_IP_; - fast_pool->pool[2] ^= ip; - fast_pool->pool[3] ^= (sizeof(ip) > 4) ? ip >> 32 : -- get_reg(fast_pool, regs); -+ get_reg(fast_pool, NULL); - - fast_mix(fast_pool); - add_interrupt_bench(cycles); -diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c -index 4da2af9694a2..5b6f57f500b8 100644 ---- a/drivers/clocksource/tcb_clksrc.c -+++ b/drivers/clocksource/tcb_clksrc.c -@@ -23,8 +23,7 @@ - * this 32 bit free-running counter. the second channel is not used. - * - * - The third channel may be used to provide a 16-bit clockevent -- * source, used in either periodic or oneshot mode. This runs -- * at 32 KiHZ, and can handle delays of up to two seconds. -+ * source, used in either periodic or oneshot mode. - * - * A boot clocksource and clockevent source are also currently needed, - * unless the relevant platforms (ARM/AT91, AVR32/AT32) are changed so -@@ -74,6 +73,8 @@ static struct clocksource clksrc = { - struct tc_clkevt_device { - struct clock_event_device clkevt; - struct clk *clk; -+ bool clk_enabled; -+ u32 freq; - void __iomem *regs; - }; - -@@ -82,15 +83,26 @@ static struct tc_clkevt_device *to_tc_clkevt(struct clock_event_device *clkevt) - return container_of(clkevt, struct tc_clkevt_device, clkevt); - } - --/* For now, we always use the 32K clock ... this optimizes for NO_HZ, -- * because using one of the divided clocks would usually mean the -- * tick rate can never be less than several dozen Hz (vs 0.5 Hz). -- * -- * A divided clock could be good for high resolution timers, since -- * 30.5 usec resolution can seem "low". -- */ - static u32 timer_clock; - -+static void tc_clk_disable(struct clock_event_device *d) -+{ -+ struct tc_clkevt_device *tcd = to_tc_clkevt(d); -+ -+ clk_disable(tcd->clk); -+ tcd->clk_enabled = false; -+} -+ -+static void tc_clk_enable(struct clock_event_device *d) -+{ -+ struct tc_clkevt_device *tcd = to_tc_clkevt(d); -+ -+ if (tcd->clk_enabled) -+ return; -+ clk_enable(tcd->clk); -+ tcd->clk_enabled = true; -+} -+ - static int tc_shutdown(struct clock_event_device *d) - { - struct tc_clkevt_device *tcd = to_tc_clkevt(d); -@@ -98,8 +110,14 @@ static int tc_shutdown(struct clock_event_device *d) - - __raw_writel(0xff, regs + ATMEL_TC_REG(2, IDR)); - __raw_writel(ATMEL_TC_CLKDIS, regs + ATMEL_TC_REG(2, CCR)); -+ return 0; -+} -+ -+static int tc_shutdown_clk_off(struct clock_event_device *d) -+{ -+ tc_shutdown(d); - if (!clockevent_state_detached(d)) -- clk_disable(tcd->clk); -+ tc_clk_disable(d); - - return 0; - } -@@ -112,9 +130,9 @@ static int tc_set_oneshot(struct clock_event_device *d) - if (clockevent_state_oneshot(d) || clockevent_state_periodic(d)) - tc_shutdown(d); - -- clk_enable(tcd->clk); -+ tc_clk_enable(d); - -- /* slow clock, count up to RC, then irq and stop */ -+ /* count up to RC, then irq and stop */ - __raw_writel(timer_clock | ATMEL_TC_CPCSTOP | ATMEL_TC_WAVE | - ATMEL_TC_WAVESEL_UP_AUTO, regs + ATMEL_TC_REG(2, CMR)); - __raw_writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER)); -@@ -134,12 +152,12 @@ static int tc_set_periodic(struct clock_event_device *d) - /* By not making the gentime core emulate periodic mode on top - * of oneshot, we get lower overhead and improved accuracy. - */ -- clk_enable(tcd->clk); -+ tc_clk_enable(d); - -- /* slow clock, count up to RC, then irq and restart */ -+ /* count up to RC, then irq and restart */ - __raw_writel(timer_clock | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO, - regs + ATMEL_TC_REG(2, CMR)); -- __raw_writel((32768 + HZ / 2) / HZ, tcaddr + ATMEL_TC_REG(2, RC)); -+ __raw_writel((tcd->freq + HZ / 2) / HZ, tcaddr + ATMEL_TC_REG(2, RC)); - - /* Enable clock and interrupts on RC compare */ - __raw_writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER)); -@@ -166,9 +184,13 @@ static struct tc_clkevt_device clkevt = { - .features = CLOCK_EVT_FEAT_PERIODIC | - CLOCK_EVT_FEAT_ONESHOT, - /* Should be lower than at91rm9200's system timer */ -+#ifdef CONFIG_ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK - .rating = 125, -+#else -+ .rating = 200, -+#endif - .set_next_event = tc_next_event, -- .set_state_shutdown = tc_shutdown, -+ .set_state_shutdown = tc_shutdown_clk_off, - .set_state_periodic = tc_set_periodic, - .set_state_oneshot = tc_set_oneshot, - }, -@@ -188,8 +210,9 @@ static irqreturn_t ch2_irq(int irq, void *handle) - return IRQ_NONE; - } - --static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx) -+static int __init setup_clkevents(struct atmel_tc *tc, int divisor_idx) - { -+ unsigned divisor = atmel_tc_divisors[divisor_idx]; - int ret; - struct clk *t2_clk = tc->clk[2]; - int irq = tc->irq[2]; -@@ -210,7 +233,11 @@ static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx) - clkevt.regs = tc->regs; - clkevt.clk = t2_clk; - -- timer_clock = clk32k_divisor_idx; -+ timer_clock = divisor_idx; -+ if (!divisor) -+ clkevt.freq = 32768; -+ else -+ clkevt.freq = clk_get_rate(t2_clk) / divisor; - - clkevt.clkevt.cpumask = cpumask_of(0); - -@@ -221,7 +248,7 @@ static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx) - return ret; - } - -- clockevents_config_and_register(&clkevt.clkevt, 32768, 1, 0xffff); -+ clockevents_config_and_register(&clkevt.clkevt, clkevt.freq, 1, 0xffff); - - return ret; - } -@@ -358,7 +385,11 @@ static int __init tcb_clksrc_init(void) - goto err_disable_t1; - - /* channel 2: periodic and oneshot timer support */ -+#ifdef CONFIG_ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK - ret = setup_clkevents(tc, clk32k_divisor_idx); -+#else -+ ret = setup_clkevents(tc, best_divisor_idx); -+#endif - if (ret) - goto err_unregister_clksrc; - -diff --git a/drivers/clocksource/timer-atmel-pit.c b/drivers/clocksource/timer-atmel-pit.c -index d911c5dca8f1..7a40f7e88468 100644 ---- a/drivers/clocksource/timer-atmel-pit.c -+++ b/drivers/clocksource/timer-atmel-pit.c -@@ -46,6 +46,7 @@ struct pit_data { - u32 cycle; - u32 cnt; - unsigned int irq; -+ bool irq_requested; - struct clk *mck; - }; - -@@ -96,15 +97,29 @@ static int pit_clkevt_shutdown(struct clock_event_device *dev) - - /* disable irq, leaving the clocksource active */ - pit_write(data->base, AT91_PIT_MR, (data->cycle - 1) | AT91_PIT_PITEN); -+ if (data->irq_requested) { -+ free_irq(data->irq, data); -+ data->irq_requested = false; -+ } - return 0; - } - -+static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id); - /* - * Clockevent device: interrupts every 1/HZ (== pit_cycles * MCK/16) - */ - static int pit_clkevt_set_periodic(struct clock_event_device *dev) - { - struct pit_data *data = clkevt_to_pit_data(dev); -+ int ret; -+ -+ ret = request_irq(data->irq, at91sam926x_pit_interrupt, -+ IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL, -+ "at91_tick", data); -+ if (ret) -+ panic(pr_fmt("Unable to setup IRQ\n")); -+ -+ data->irq_requested = true; - - /* update clocksource counter */ - data->cnt += data->cycle * PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR)); -@@ -181,7 +196,6 @@ static void __init at91sam926x_pit_common_init(struct pit_data *data) - { - unsigned long pit_rate; - unsigned bits; -- int ret; - - /* - * Use our actual MCK to figure out how many MCK/16 ticks per -@@ -206,13 +220,6 @@ static void __init at91sam926x_pit_common_init(struct pit_data *data) - data->clksrc.flags = CLOCK_SOURCE_IS_CONTINUOUS; - clocksource_register_hz(&data->clksrc, pit_rate); - -- /* Set up irq handler */ -- ret = request_irq(data->irq, at91sam926x_pit_interrupt, -- IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL, -- "at91_tick", data); -- if (ret) -- panic(pr_fmt("Unable to setup IRQ\n")); -- - /* Set up and register clockevents */ - data->clkevt.name = "pit"; - data->clkevt.features = CLOCK_EVT_FEAT_PERIODIC; -diff --git a/drivers/clocksource/timer-atmel-st.c b/drivers/clocksource/timer-atmel-st.c -index 29d21d68df5a..103d0fd70cc4 100644 ---- a/drivers/clocksource/timer-atmel-st.c -+++ b/drivers/clocksource/timer-atmel-st.c -@@ -115,18 +115,29 @@ static void clkdev32k_disable_and_flush_irq(void) - last_crtr = read_CRTR(); - } - -+static int atmel_st_irq; -+ - static int clkevt32k_shutdown(struct clock_event_device *evt) - { - clkdev32k_disable_and_flush_irq(); - irqmask = 0; - regmap_write(regmap_st, AT91_ST_IER, irqmask); -+ free_irq(atmel_st_irq, regmap_st); - return 0; - } - - static int clkevt32k_set_oneshot(struct clock_event_device *dev) - { -+ int ret; -+ - clkdev32k_disable_and_flush_irq(); - -+ ret = request_irq(atmel_st_irq, at91rm9200_timer_interrupt, -+ IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL, -+ "at91_tick", regmap_st); -+ if (ret) -+ panic(pr_fmt("Unable to setup IRQ\n")); -+ - /* - * ALM for oneshot irqs, set by next_event() - * before 32 seconds have passed. -@@ -139,8 +150,16 @@ static int clkevt32k_set_oneshot(struct clock_event_device *dev) - - static int clkevt32k_set_periodic(struct clock_event_device *dev) - { -+ int ret; -+ - clkdev32k_disable_and_flush_irq(); - -+ ret = request_irq(atmel_st_irq, at91rm9200_timer_interrupt, -+ IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL, -+ "at91_tick", regmap_st); -+ if (ret) -+ panic(pr_fmt("Unable to setup IRQ\n")); -+ - /* PIT for periodic irqs; fixed rate of 1/HZ */ - irqmask = AT91_ST_PITS; - regmap_write(regmap_st, AT91_ST_PIMR, timer_latch); -@@ -198,7 +217,7 @@ static void __init atmel_st_timer_init(struct device_node *node) - { - struct clk *sclk; - unsigned int sclk_rate, val; -- int irq, ret; -+ int ret; - - regmap_st = syscon_node_to_regmap(node); - if (IS_ERR(regmap_st)) -@@ -210,17 +229,10 @@ static void __init atmel_st_timer_init(struct device_node *node) - regmap_read(regmap_st, AT91_ST_SR, &val); - - /* Get the interrupts property */ -- irq = irq_of_parse_and_map(node, 0); -- if (!irq) -+ atmel_st_irq = irq_of_parse_and_map(node, 0); -+ if (!atmel_st_irq) - panic(pr_fmt("Unable to get IRQ from DT\n")); - -- /* Make IRQs happen for the system timer */ -- ret = request_irq(irq, at91rm9200_timer_interrupt, -- IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL, -- "at91_tick", regmap_st); -- if (ret) -- panic(pr_fmt("Unable to setup IRQ\n")); -- - sclk = of_clk_get(node, 0); - if (IS_ERR(sclk)) - panic(pr_fmt("Unable to get slow clock\n")); -diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86 -index c59bdcb83217..8f23161d80be 100644 ---- a/drivers/cpufreq/Kconfig.x86 -+++ b/drivers/cpufreq/Kconfig.x86 -@@ -123,7 +123,7 @@ config X86_POWERNOW_K7_ACPI - - config X86_POWERNOW_K8 - tristate "AMD Opteron/Athlon64 PowerNow!" -- depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ -+ depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ && !PREEMPT_RT_BASE - help - This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors. - Support for K10 and newer processors is now in acpi-cpufreq. -diff --git a/drivers/crypto/ccp/ccp-dev.c b/drivers/crypto/ccp/ccp-dev.c -index 4dbc18727235..2a8ad712a5f2 100644 ---- a/drivers/crypto/ccp/ccp-dev.c -+++ b/drivers/crypto/ccp/ccp-dev.c -@@ -16,7 +16,6 @@ - #include <linux/sched.h> - #include <linux/interrupt.h> - #include <linux/spinlock.h> --#include <linux/rwlock_types.h> - #include <linux/types.h> - #include <linux/mutex.h> - #include <linux/delay.h> -diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h -index daba7ebb9699..18d58f136628 100644 ---- a/drivers/gpu/drm/i915/i915_drv.h -+++ b/drivers/gpu/drm/i915/i915_drv.h -@@ -714,7 +714,7 @@ struct intel_uncore { - struct drm_i915_private *i915; - enum forcewake_domain_id id; - unsigned wake_count; -- struct timer_list timer; -+ struct hrtimer timer; - i915_reg_t reg_set; - u32 val_set; - u32 val_clear; -diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c -index 1328bc5021b4..62103660b4c7 100644 ---- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c -+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c -@@ -1314,7 +1314,9 @@ i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params, - if (ret) - return ret; - -+#ifndef CONFIG_PREEMPT_RT_BASE - trace_i915_gem_ring_dispatch(params->request, params->dispatch_flags); -+#endif - - i915_gem_execbuffer_move_to_active(vmas, params->request); - i915_gem_execbuffer_retire_commands(params); -diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c -index 3af40616bf8b..46882680468e 100644 ---- a/drivers/gpu/drm/i915/i915_gem_shrinker.c -+++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c -@@ -39,7 +39,7 @@ static bool mutex_is_locked_by(struct mutex *mutex, struct task_struct *task) - if (!mutex_is_locked(mutex)) - return false; - --#if defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_MUTEX_SPIN_ON_OWNER) -+#if (defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_MUTEX_SPIN_ON_OWNER)) && !defined(CONFIG_PREEMPT_RT_BASE) - return mutex->owner == task; - #else - /* Since UP may be pre-empted, we cannot assume that we own the lock */ -diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c -index d1a46ef5ab3f..7d43f913de24 100644 ---- a/drivers/gpu/drm/i915/i915_irq.c -+++ b/drivers/gpu/drm/i915/i915_irq.c -@@ -830,6 +830,7 @@ static int i915_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe, - spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); - - /* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */ -+ preempt_disable_rt(); - - /* Get optional system timestamp before query. */ - if (stime) -@@ -881,6 +882,7 @@ static int i915_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe, - *etime = ktime_get(); - - /* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */ -+ preempt_enable_rt(); - - spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); - -diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c -index e5db9e1f623f..5ca085d99181 100644 ---- a/drivers/gpu/drm/i915/intel_display.c -+++ b/drivers/gpu/drm/i915/intel_display.c -@@ -11496,7 +11496,7 @@ void intel_check_page_flip(struct drm_device *dev, int pipe) - struct intel_crtc *intel_crtc = to_intel_crtc(crtc); - struct intel_unpin_work *work; - -- WARN_ON(!in_interrupt()); -+ WARN_ON_NONRT(!in_interrupt()); - - if (crtc == NULL) - return; -diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c -index a2582c455b36..c459b91586b0 100644 ---- a/drivers/gpu/drm/i915/intel_sprite.c -+++ b/drivers/gpu/drm/i915/intel_sprite.c -@@ -38,6 +38,7 @@ - #include "intel_drv.h" - #include <drm/i915_drm.h> - #include "i915_drv.h" -+#include <linux/locallock.h> - - static bool - format_is_yuv(uint32_t format) -@@ -64,6 +65,8 @@ static int usecs_to_scanlines(const struct drm_display_mode *adjusted_mode, - 1000 * adjusted_mode->crtc_htotal); - } - -+static DEFINE_LOCAL_IRQ_LOCK(pipe_update_lock); -+ - /** - * intel_pipe_update_start() - start update of a set of display registers - * @crtc: the crtc of which the registers are going to be updated -@@ -96,7 +99,7 @@ void intel_pipe_update_start(struct intel_crtc *crtc) - min = vblank_start - usecs_to_scanlines(adjusted_mode, 100); - max = vblank_start - 1; - -- local_irq_disable(); -+ local_lock_irq(pipe_update_lock); - - if (min <= 0 || max <= 0) - return; -@@ -126,11 +129,11 @@ void intel_pipe_update_start(struct intel_crtc *crtc) - break; - } - -- local_irq_enable(); -+ local_unlock_irq(pipe_update_lock); - - timeout = schedule_timeout(timeout); - -- local_irq_disable(); -+ local_lock_irq(pipe_update_lock); - } - - finish_wait(wq, &wait); -@@ -164,7 +167,7 @@ void intel_pipe_update_end(struct intel_crtc *crtc) - - trace_i915_pipe_update_end(crtc, end_vbl_count, scanline_end); - -- local_irq_enable(); -+ local_unlock_irq(pipe_update_lock); - - if (crtc->debug.start_vbl_count && - crtc->debug.start_vbl_count != end_vbl_count) { -diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c -index 68b6f69aa682..49aefb097c15 100644 ---- a/drivers/gpu/drm/i915/intel_uncore.c -+++ b/drivers/gpu/drm/i915/intel_uncore.c -@@ -60,7 +60,11 @@ fw_domain_reset(const struct intel_uncore_forcewake_domain *d) - static inline void - fw_domain_arm_timer(struct intel_uncore_forcewake_domain *d) - { -- mod_timer_pinned(&d->timer, jiffies + 1); -+ d->wake_count++; -+ hrtimer_start_range_ns(&d->timer, -+ ktime_set(0, NSEC_PER_MSEC), -+ NSEC_PER_MSEC, -+ HRTIMER_MODE_REL); - } - - static inline void -@@ -224,9 +228,11 @@ static int __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv) - return ret; - } - --static void intel_uncore_fw_release_timer(unsigned long arg) -+static enum hrtimer_restart -+intel_uncore_fw_release_timer(struct hrtimer *timer) - { -- struct intel_uncore_forcewake_domain *domain = (void *)arg; -+ struct intel_uncore_forcewake_domain *domain = -+ container_of(timer, struct intel_uncore_forcewake_domain, timer); - unsigned long irqflags; - - assert_rpm_device_not_suspended(domain->i915); -@@ -240,6 +246,8 @@ static void intel_uncore_fw_release_timer(unsigned long arg) - 1 << domain->id); - - spin_unlock_irqrestore(&domain->i915->uncore.lock, irqflags); -+ -+ return HRTIMER_NORESTART; - } - - void intel_uncore_forcewake_reset(struct drm_device *dev, bool restore) -@@ -259,16 +267,16 @@ void intel_uncore_forcewake_reset(struct drm_device *dev, bool restore) - active_domains = 0; - - for_each_fw_domain(domain, dev_priv, id) { -- if (del_timer_sync(&domain->timer) == 0) -+ if (hrtimer_cancel(&domain->timer) == 0) - continue; - -- intel_uncore_fw_release_timer((unsigned long)domain); -+ intel_uncore_fw_release_timer(&domain->timer); - } - - spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); - - for_each_fw_domain(domain, dev_priv, id) { -- if (timer_pending(&domain->timer)) -+ if (hrtimer_active(&domain->timer)) - active_domains |= (1 << id); - } - -@@ -491,7 +499,6 @@ static void __intel_uncore_forcewake_put(struct drm_i915_private *dev_priv, - if (--domain->wake_count) - continue; - -- domain->wake_count++; - fw_domain_arm_timer(domain); - } - } -@@ -732,7 +739,6 @@ static inline void __force_wake_get(struct drm_i915_private *dev_priv, - continue; - } - -- domain->wake_count++; - fw_domain_arm_timer(domain); - } - -@@ -1150,7 +1156,8 @@ static void fw_domain_init(struct drm_i915_private *dev_priv, - d->i915 = dev_priv; - d->id = domain_id; - -- setup_timer(&d->timer, intel_uncore_fw_release_timer, (unsigned long)d); -+ hrtimer_init(&d->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); -+ d->timer.function = intel_uncore_fw_release_timer; - - dev_priv->uncore.fw_domains |= (1 << domain_id); - -diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c -index fcc7483d3f7b..dc44af5675d9 100644 ---- a/drivers/gpu/drm/radeon/radeon_display.c -+++ b/drivers/gpu/drm/radeon/radeon_display.c -@@ -1863,6 +1863,7 @@ int radeon_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe, - struct radeon_device *rdev = dev->dev_private; - - /* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */ -+ preempt_disable_rt(); - - /* Get optional system timestamp before query. */ - if (stime) -@@ -1955,6 +1956,7 @@ int radeon_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe, - *etime = ktime_get(); - - /* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */ -+ preempt_enable_rt(); - - /* Decode into vertical and horizontal scanout position. */ - *vpos = position & 0x1fff; -diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c -index 13c45296ce5b..50c035c73357 100644 ---- a/drivers/i2c/busses/i2c-omap.c -+++ b/drivers/i2c/busses/i2c-omap.c -@@ -995,15 +995,12 @@ omap_i2c_isr(int irq, void *dev_id) - u16 mask; - u16 stat; - -- spin_lock(&omap->lock); -- mask = omap_i2c_read_reg(omap, OMAP_I2C_IE_REG); - stat = omap_i2c_read_reg(omap, OMAP_I2C_STAT_REG); -+ mask = omap_i2c_read_reg(omap, OMAP_I2C_IE_REG); - - if (stat & mask) - ret = IRQ_WAKE_THREAD; - -- spin_unlock(&omap->lock); -- - return ret; - } - -diff --git a/drivers/ide/alim15x3.c b/drivers/ide/alim15x3.c -index 36f76e28a0bf..394f142f90c7 100644 ---- a/drivers/ide/alim15x3.c -+++ b/drivers/ide/alim15x3.c -@@ -234,7 +234,7 @@ static int init_chipset_ali15x3(struct pci_dev *dev) - - isa_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL); - -- local_irq_save(flags); -+ local_irq_save_nort(flags); - - if (m5229_revision < 0xC2) { - /* -@@ -325,7 +325,7 @@ static int init_chipset_ali15x3(struct pci_dev *dev) - } - pci_dev_put(north); - pci_dev_put(isa_dev); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - return 0; - } - -diff --git a/drivers/ide/hpt366.c b/drivers/ide/hpt366.c -index f94baadbf424..71c41cfe85e9 100644 ---- a/drivers/ide/hpt366.c -+++ b/drivers/ide/hpt366.c -@@ -1236,7 +1236,7 @@ static int init_dma_hpt366(ide_hwif_t *hwif, - - dma_old = inb(base + 2); - -- local_irq_save(flags); -+ local_irq_save_nort(flags); - - dma_new = dma_old; - pci_read_config_byte(dev, hwif->channel ? 0x4b : 0x43, &masterdma); -@@ -1247,7 +1247,7 @@ static int init_dma_hpt366(ide_hwif_t *hwif, - if (dma_new != dma_old) - outb(dma_new, base + 2); - -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - - printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx\n", - hwif->name, base, base + 7); -diff --git a/drivers/ide/ide-io-std.c b/drivers/ide/ide-io-std.c -index 19763977568c..4169433faab5 100644 ---- a/drivers/ide/ide-io-std.c -+++ b/drivers/ide/ide-io-std.c -@@ -175,7 +175,7 @@ void ide_input_data(ide_drive_t *drive, struct ide_cmd *cmd, void *buf, - unsigned long uninitialized_var(flags); - - if ((io_32bit & 2) && !mmio) { -- local_irq_save(flags); -+ local_irq_save_nort(flags); - ata_vlb_sync(io_ports->nsect_addr); - } - -@@ -186,7 +186,7 @@ void ide_input_data(ide_drive_t *drive, struct ide_cmd *cmd, void *buf, - insl(data_addr, buf, words); - - if ((io_32bit & 2) && !mmio) -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - - if (((len + 1) & 3) < 2) - return; -@@ -219,7 +219,7 @@ void ide_output_data(ide_drive_t *drive, struct ide_cmd *cmd, void *buf, - unsigned long uninitialized_var(flags); - - if ((io_32bit & 2) && !mmio) { -- local_irq_save(flags); -+ local_irq_save_nort(flags); - ata_vlb_sync(io_ports->nsect_addr); - } - -@@ -230,7 +230,7 @@ void ide_output_data(ide_drive_t *drive, struct ide_cmd *cmd, void *buf, - outsl(data_addr, buf, words); - - if ((io_32bit & 2) && !mmio) -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - - if (((len + 1) & 3) < 2) - return; -diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c -index 669ea1e45795..e12e43e62245 100644 ---- a/drivers/ide/ide-io.c -+++ b/drivers/ide/ide-io.c -@@ -659,7 +659,7 @@ void ide_timer_expiry (unsigned long data) - /* disable_irq_nosync ?? */ - disable_irq(hwif->irq); - /* local CPU only, as if we were handling an interrupt */ -- local_irq_disable(); -+ local_irq_disable_nort(); - if (hwif->polling) { - startstop = handler(drive); - } else if (drive_is_ready(drive)) { -diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c -index 376f2dc410c5..f014dd1b73dc 100644 ---- a/drivers/ide/ide-iops.c -+++ b/drivers/ide/ide-iops.c -@@ -129,12 +129,12 @@ int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, - if ((stat & ATA_BUSY) == 0) - break; - -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - *rstat = stat; - return -EBUSY; - } - } -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - } - /* - * Allow status to settle, then read it again. -diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c -index 0b63facd1d87..4ceba37afc0c 100644 ---- a/drivers/ide/ide-probe.c -+++ b/drivers/ide/ide-probe.c -@@ -196,10 +196,10 @@ static void do_identify(ide_drive_t *drive, u8 cmd, u16 *id) - int bswap = 1; - - /* local CPU only; some systems need this */ -- local_irq_save(flags); -+ local_irq_save_nort(flags); - /* read 512 bytes of id info */ - hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - - drive->dev_flags |= IDE_DFLAG_ID_READ; - #ifdef DEBUG -diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c -index a716693417a3..be0568c722d6 100644 ---- a/drivers/ide/ide-taskfile.c -+++ b/drivers/ide/ide-taskfile.c -@@ -250,7 +250,7 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd, - - page_is_high = PageHighMem(page); - if (page_is_high) -- local_irq_save(flags); -+ local_irq_save_nort(flags); - - buf = kmap_atomic(page) + offset; - -@@ -271,7 +271,7 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd, - kunmap_atomic(buf); - - if (page_is_high) -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - - len -= nr_bytes; - } -@@ -414,7 +414,7 @@ static ide_startstop_t pre_task_out_intr(ide_drive_t *drive, - } - - if ((drive->dev_flags & IDE_DFLAG_UNMASK) == 0) -- local_irq_disable(); -+ local_irq_disable_nort(); - - ide_set_handler(drive, &task_pio_intr, WAIT_WORSTCASE); - -diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c -index f0e55e47eb54..da5f28c892ca 100644 ---- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c -+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c -@@ -51,8 +51,6 @@ MODULE_PARM_DESC(data_debug_level, - "Enable data path debug tracing if > 0"); - #endif - --static DEFINE_MUTEX(pkey_mutex); -- - struct ipoib_ah *ipoib_create_ah(struct net_device *dev, - struct ib_pd *pd, struct ib_ah_attr *attr) - { -diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c -index 25889311b1e9..7fe9dd26a4da 100644 ---- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c -+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c -@@ -883,7 +883,7 @@ void ipoib_mcast_restart_task(struct work_struct *work) - - ipoib_dbg_mcast(priv, "restarting multicast task\n"); - -- local_irq_save(flags); -+ local_irq_save_nort(flags); - netif_addr_lock(dev); - spin_lock(&priv->lock); - -@@ -965,7 +965,7 @@ void ipoib_mcast_restart_task(struct work_struct *work) - - spin_unlock(&priv->lock); - netif_addr_unlock(dev); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - - /* - * make sure the in-flight joins have finished before we attempt -diff --git a/drivers/input/gameport/gameport.c b/drivers/input/gameport/gameport.c -index 4a2a9e370be7..e970d9afd179 100644 ---- a/drivers/input/gameport/gameport.c -+++ b/drivers/input/gameport/gameport.c -@@ -91,13 +91,13 @@ static int gameport_measure_speed(struct gameport *gameport) - tx = ~0; - - for (i = 0; i < 50; i++) { -- local_irq_save(flags); -+ local_irq_save_nort(flags); - t1 = ktime_get_ns(); - for (t = 0; t < 50; t++) - gameport_read(gameport); - t2 = ktime_get_ns(); - t3 = ktime_get_ns(); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - udelay(i * 10); - t = (t2 - t1) - (t3 - t2); - if (t < tx) -@@ -124,12 +124,12 @@ static int old_gameport_measure_speed(struct gameport *gameport) - tx = 1 << 30; - - for(i = 0; i < 50; i++) { -- local_irq_save(flags); -+ local_irq_save_nort(flags); - GET_TIME(t1); - for (t = 0; t < 50; t++) gameport_read(gameport); - GET_TIME(t2); - GET_TIME(t3); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - udelay(i * 10); - if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t; - } -@@ -148,11 +148,11 @@ static int old_gameport_measure_speed(struct gameport *gameport) - tx = 1 << 30; - - for(i = 0; i < 50; i++) { -- local_irq_save(flags); -+ local_irq_save_nort(flags); - t1 = rdtsc(); - for (t = 0; t < 50; t++) gameport_read(gameport); - t2 = rdtsc(); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - udelay(i * 10); - if (t2 - t1 < tx) tx = t2 - t1; - } -diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c -index 5efadad4615b..42fc6280729b 100644 ---- a/drivers/iommu/amd_iommu.c -+++ b/drivers/iommu/amd_iommu.c -@@ -2165,10 +2165,10 @@ static int __attach_device(struct iommu_dev_data *dev_data, - int ret; - - /* -- * Must be called with IRQs disabled. Warn here to detect early -- * when its not. -+ * Must be called with IRQs disabled on a non RT kernel. Warn here to -+ * detect early when its not. - */ -- WARN_ON(!irqs_disabled()); -+ WARN_ON_NONRT(!irqs_disabled()); - - /* lock domain */ - spin_lock(&domain->lock); -@@ -2331,10 +2331,10 @@ static void __detach_device(struct iommu_dev_data *dev_data) - struct protection_domain *domain; - - /* -- * Must be called with IRQs disabled. Warn here to detect early -- * when its not. -+ * Must be called with IRQs disabled on a non RT kernel. Warn here to -+ * detect early when its not. - */ -- WARN_ON(!irqs_disabled()); -+ WARN_ON_NONRT(!irqs_disabled()); - - if (WARN_ON(!dev_data->domain)) - return; -diff --git a/drivers/leds/trigger/Kconfig b/drivers/leds/trigger/Kconfig -index 5bda6a9b56bb..d6286584c807 100644 ---- a/drivers/leds/trigger/Kconfig -+++ b/drivers/leds/trigger/Kconfig -@@ -61,7 +61,7 @@ config LEDS_TRIGGER_BACKLIGHT - - config LEDS_TRIGGER_CPU - bool "LED CPU Trigger" -- depends on LEDS_TRIGGERS -+ depends on LEDS_TRIGGERS && !PREEMPT_RT_BASE - help - This allows LEDs to be controlled by active CPUs. This shows - the active CPUs across an array of LEDs so you can see which -diff --git a/drivers/md/bcache/Kconfig b/drivers/md/bcache/Kconfig -index 4d200883c505..98b64ed5cb81 100644 ---- a/drivers/md/bcache/Kconfig -+++ b/drivers/md/bcache/Kconfig -@@ -1,6 +1,7 @@ - - config BCACHE - tristate "Block device as cache" -+ depends on !PREEMPT_RT_FULL - ---help--- - Allows a block device to be used as cache for other devices; uses - a btree for indexing and the layout is optimized for SSDs. -diff --git a/drivers/md/dm.c b/drivers/md/dm.c -index 3d3ac13287a4..b931c7b85a0b 100644 ---- a/drivers/md/dm.c -+++ b/drivers/md/dm.c -@@ -2187,7 +2187,7 @@ static void dm_request_fn(struct request_queue *q) - /* Establish tio->ti before queuing work (map_tio_request) */ - tio->ti = ti; - queue_kthread_work(&md->kworker, &tio->work); -- BUG_ON(!irqs_disabled()); -+ BUG_ON_NONRT(!irqs_disabled()); - } - } - -diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c -index e48c262ce032..25b82212e67f 100644 ---- a/drivers/md/raid5.c -+++ b/drivers/md/raid5.c -@@ -1918,8 +1918,9 @@ static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request) - struct raid5_percpu *percpu; - unsigned long cpu; - -- cpu = get_cpu(); -+ cpu = get_cpu_light(); - percpu = per_cpu_ptr(conf->percpu, cpu); -+ spin_lock(&percpu->lock); - if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { - ops_run_biofill(sh); - overlap_clear++; -@@ -1975,7 +1976,8 @@ static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request) - if (test_and_clear_bit(R5_Overlap, &dev->flags)) - wake_up(&sh->raid_conf->wait_for_overlap); - } -- put_cpu(); -+ spin_unlock(&percpu->lock); -+ put_cpu_light(); - } - - static struct stripe_head *alloc_stripe(struct kmem_cache *sc, gfp_t gfp) -@@ -6415,6 +6417,7 @@ static int raid5_alloc_percpu(struct r5conf *conf) - __func__, cpu); - break; - } -+ spin_lock_init(&per_cpu_ptr(conf->percpu, cpu)->lock); - } - put_online_cpus(); - -diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h -index 517d4b68a1be..efe91887ecd7 100644 ---- a/drivers/md/raid5.h -+++ b/drivers/md/raid5.h -@@ -504,6 +504,7 @@ struct r5conf { - int recovery_disabled; - /* per cpu variables */ - struct raid5_percpu { -+ spinlock_t lock; /* Protection for -RT */ - struct page *spare_page; /* Used when checking P/Q in raid6 */ - struct flex_array *scribble; /* space for constructing buffer - * lists and performing address -diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig -index a216b4667742..cea73201112e 100644 ---- a/drivers/misc/Kconfig -+++ b/drivers/misc/Kconfig -@@ -54,6 +54,7 @@ config AD525X_DPOT_SPI - config ATMEL_TCLIB - bool "Atmel AT32/AT91 Timer/Counter Library" - depends on (AVR32 || ARCH_AT91) -+ default y if PREEMPT_RT_FULL - help - Select this if you want a library to allocate the Timer/Counter - blocks found on many Atmel processors. This facilitates using -@@ -69,8 +70,7 @@ config ATMEL_TCB_CLKSRC - are combined to make a single 32-bit timer. - - When GENERIC_CLOCKEVENTS is defined, the third timer channel -- may be used as a clock event device supporting oneshot mode -- (delays of up to two seconds) based on the 32 KiHz clock. -+ may be used as a clock event device supporting oneshot mode. - - config ATMEL_TCB_CLKSRC_BLOCK - int -@@ -84,6 +84,15 @@ config ATMEL_TCB_CLKSRC_BLOCK - TC can be used for other purposes, such as PWM generation and - interval timing. - -+config ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK -+ bool "TC Block use 32 KiHz clock" -+ depends on ATMEL_TCB_CLKSRC -+ default y if !PREEMPT_RT_FULL -+ help -+ Select this to use 32 KiHz base clock rate as TC block clock -+ source for clock events. -+ -+ - config DUMMY_IRQ - tristate "Dummy IRQ handler" - default n -@@ -114,6 +123,35 @@ config IBM_ASM - for information on the specific driver level and support statement - for your IBM server. - -+config HWLAT_DETECTOR -+ tristate "Testing module to detect hardware-induced latencies" -+ depends on DEBUG_FS -+ depends on RING_BUFFER -+ default m -+ ---help--- -+ A simple hardware latency detector. Use this module to detect -+ large latencies introduced by the behavior of the underlying -+ system firmware external to Linux. We do this using periodic -+ use of stop_machine to grab all available CPUs and measure -+ for unexplainable gaps in the CPU timestamp counter(s). By -+ default, the module is not enabled until the "enable" file -+ within the "hwlat_detector" debugfs directory is toggled. -+ -+ This module is often used to detect SMI (System Management -+ Interrupts) on x86 systems, though is not x86 specific. To -+ this end, we default to using a sample window of 1 second, -+ during which we will sample for 0.5 seconds. If an SMI or -+ similar event occurs during that time, it is recorded -+ into an 8K samples global ring buffer until retreived. -+ -+ WARNING: This software should never be enabled (it can be built -+ but should not be turned on after it is loaded) in a production -+ environment where high latencies are a concern since the -+ sampling mechanism actually introduces latencies for -+ regular tasks while the CPU(s) are being held. -+ -+ If unsure, say N -+ - config PHANTOM - tristate "Sensable PHANToM (PCI)" - depends on PCI -diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile -index b2fb6dbffcef..22827d5a3ba6 100644 ---- a/drivers/misc/Makefile -+++ b/drivers/misc/Makefile -@@ -39,6 +39,7 @@ obj-$(CONFIG_C2PORT) += c2port/ - obj-$(CONFIG_HMC6352) += hmc6352.o - obj-y += eeprom/ - obj-y += cb710/ -+obj-$(CONFIG_HWLAT_DETECTOR) += hwlat_detector.o - obj-$(CONFIG_SPEAR13XX_PCIE_GADGET) += spear13xx_pcie_gadget.o - obj-$(CONFIG_VMWARE_BALLOON) += vmw_balloon.o - obj-$(CONFIG_ARM_CHARLCD) += arm-charlcd.o -diff --git a/drivers/misc/hwlat_detector.c b/drivers/misc/hwlat_detector.c -new file mode 100644 -index 000000000000..52f5ad5fd9c0 ---- /dev/null -+++ b/drivers/misc/hwlat_detector.c -@@ -0,0 +1,1240 @@ -+/* -+ * hwlat_detector.c - A simple Hardware Latency detector. -+ * -+ * Use this module to detect large system latencies induced by the behavior of -+ * certain underlying system hardware or firmware, independent of Linux itself. -+ * The code was developed originally to detect the presence of SMIs on Intel -+ * and AMD systems, although there is no dependency upon x86 herein. -+ * -+ * The classical example usage of this module is in detecting the presence of -+ * SMIs or System Management Interrupts on Intel and AMD systems. An SMI is a -+ * somewhat special form of hardware interrupt spawned from earlier CPU debug -+ * modes in which the (BIOS/EFI/etc.) firmware arranges for the South Bridge -+ * LPC (or other device) to generate a special interrupt under certain -+ * circumstances, for example, upon expiration of a special SMI timer device, -+ * due to certain external thermal readings, on certain I/O address accesses, -+ * and other situations. An SMI hits a special CPU pin, triggers a special -+ * SMI mode (complete with special memory map), and the OS is unaware. -+ * -+ * Although certain hardware-inducing latencies are necessary (for example, -+ * a modern system often requires an SMI handler for correct thermal control -+ * and remote management) they can wreak havoc upon any OS-level performance -+ * guarantees toward low-latency, especially when the OS is not even made -+ * aware of the presence of these interrupts. For this reason, we need a -+ * somewhat brute force mechanism to detect these interrupts. In this case, -+ * we do it by hogging all of the CPU(s) for configurable timer intervals, -+ * sampling the built-in CPU timer, looking for discontiguous readings. -+ * -+ * WARNING: This implementation necessarily introduces latencies. Therefore, -+ * you should NEVER use this module in a production environment -+ * requiring any kind of low-latency performance guarantee(s). -+ * -+ * Copyright (C) 2008-2009 Jon Masters, Red Hat, Inc. <jcm@redhat.com> -+ * -+ * Includes useful feedback from Clark Williams <clark@redhat.com> -+ * -+ * This file is licensed under the terms of the GNU General Public -+ * License version 2. This program is licensed "as is" without any -+ * warranty of any kind, whether express or implied. -+ */ -+ -+#include <linux/module.h> -+#include <linux/init.h> -+#include <linux/ring_buffer.h> -+#include <linux/time.h> -+#include <linux/hrtimer.h> -+#include <linux/kthread.h> -+#include <linux/debugfs.h> -+#include <linux/seq_file.h> -+#include <linux/uaccess.h> -+#include <linux/version.h> -+#include <linux/delay.h> -+#include <linux/slab.h> -+#include <linux/trace_clock.h> -+ -+#define BUF_SIZE_DEFAULT 262144UL /* 8K*(sizeof(entry)) */ -+#define BUF_FLAGS (RB_FL_OVERWRITE) /* no block on full */ -+#define U64STR_SIZE 22 /* 20 digits max */ -+ -+#define VERSION "1.0.0" -+#define BANNER "hwlat_detector: " -+#define DRVNAME "hwlat_detector" -+#define DEFAULT_SAMPLE_WINDOW 1000000 /* 1s */ -+#define DEFAULT_SAMPLE_WIDTH 500000 /* 0.5s */ -+#define DEFAULT_LAT_THRESHOLD 10 /* 10us */ -+ -+/* Module metadata */ -+ -+MODULE_LICENSE("GPL"); -+MODULE_AUTHOR("Jon Masters <jcm@redhat.com>"); -+MODULE_DESCRIPTION("A simple hardware latency detector"); -+MODULE_VERSION(VERSION); -+ -+/* Module parameters */ -+ -+static int debug; -+static int enabled; -+static int threshold; -+ -+module_param(debug, int, 0); /* enable debug */ -+module_param(enabled, int, 0); /* enable detector */ -+module_param(threshold, int, 0); /* latency threshold */ -+ -+/* Buffering and sampling */ -+ -+static struct ring_buffer *ring_buffer; /* sample buffer */ -+static DEFINE_MUTEX(ring_buffer_mutex); /* lock changes */ -+static unsigned long buf_size = BUF_SIZE_DEFAULT; -+static struct task_struct *kthread; /* sampling thread */ -+ -+/* DebugFS filesystem entries */ -+ -+static struct dentry *debug_dir; /* debugfs directory */ -+static struct dentry *debug_max; /* maximum TSC delta */ -+static struct dentry *debug_count; /* total detect count */ -+static struct dentry *debug_sample_width; /* sample width us */ -+static struct dentry *debug_sample_window; /* sample window us */ -+static struct dentry *debug_sample; /* raw samples us */ -+static struct dentry *debug_threshold; /* threshold us */ -+static struct dentry *debug_enable; /* enable/disable */ -+ -+/* Individual samples and global state */ -+ -+struct sample; /* latency sample */ -+struct data; /* Global state */ -+ -+/* Sampling functions */ -+static int __buffer_add_sample(struct sample *sample); -+static struct sample *buffer_get_sample(struct sample *sample); -+ -+/* Threading and state */ -+static int kthread_fn(void *unused); -+static int start_kthread(void); -+static int stop_kthread(void); -+static void __reset_stats(void); -+static int init_stats(void); -+ -+/* Debugfs interface */ -+static ssize_t simple_data_read(struct file *filp, char __user *ubuf, -+ size_t cnt, loff_t *ppos, const u64 *entry); -+static ssize_t simple_data_write(struct file *filp, const char __user *ubuf, -+ size_t cnt, loff_t *ppos, u64 *entry); -+static int debug_sample_fopen(struct inode *inode, struct file *filp); -+static ssize_t debug_sample_fread(struct file *filp, char __user *ubuf, -+ size_t cnt, loff_t *ppos); -+static int debug_sample_release(struct inode *inode, struct file *filp); -+static int debug_enable_fopen(struct inode *inode, struct file *filp); -+static ssize_t debug_enable_fread(struct file *filp, char __user *ubuf, -+ size_t cnt, loff_t *ppos); -+static ssize_t debug_enable_fwrite(struct file *file, -+ const char __user *user_buffer, -+ size_t user_size, loff_t *offset); -+ -+/* Initialization functions */ -+static int init_debugfs(void); -+static void free_debugfs(void); -+static int detector_init(void); -+static void detector_exit(void); -+ -+/* Individual latency samples are stored here when detected and packed into -+ * the ring_buffer circular buffer, where they are overwritten when -+ * more than buf_size/sizeof(sample) samples are received. */ -+struct sample { -+ u64 seqnum; /* unique sequence */ -+ u64 duration; /* ktime delta */ -+ u64 outer_duration; /* ktime delta (outer loop) */ -+ struct timespec timestamp; /* wall time */ -+ unsigned long lost; -+}; -+ -+/* keep the global state somewhere. */ -+static struct data { -+ -+ struct mutex lock; /* protect changes */ -+ -+ u64 count; /* total since reset */ -+ u64 max_sample; /* max hardware latency */ -+ u64 threshold; /* sample threshold level */ -+ -+ u64 sample_window; /* total sampling window (on+off) */ -+ u64 sample_width; /* active sampling portion of window */ -+ -+ atomic_t sample_open; /* whether the sample file is open */ -+ -+ wait_queue_head_t wq; /* waitqeue for new sample values */ -+ -+} data; -+ -+/** -+ * __buffer_add_sample - add a new latency sample recording to the ring buffer -+ * @sample: The new latency sample value -+ * -+ * This receives a new latency sample and records it in a global ring buffer. -+ * No additional locking is used in this case. -+ */ -+static int __buffer_add_sample(struct sample *sample) -+{ -+ return ring_buffer_write(ring_buffer, -+ sizeof(struct sample), sample); -+} -+ -+/** -+ * buffer_get_sample - remove a hardware latency sample from the ring buffer -+ * @sample: Pre-allocated storage for the sample -+ * -+ * This retrieves a hardware latency sample from the global circular buffer -+ */ -+static struct sample *buffer_get_sample(struct sample *sample) -+{ -+ struct ring_buffer_event *e = NULL; -+ struct sample *s = NULL; -+ unsigned int cpu = 0; -+ -+ if (!sample) -+ return NULL; -+ -+ mutex_lock(&ring_buffer_mutex); -+ for_each_online_cpu(cpu) { -+ e = ring_buffer_consume(ring_buffer, cpu, NULL, &sample->lost); -+ if (e) -+ break; -+ } -+ -+ if (e) { -+ s = ring_buffer_event_data(e); -+ memcpy(sample, s, sizeof(struct sample)); -+ } else -+ sample = NULL; -+ mutex_unlock(&ring_buffer_mutex); -+ -+ return sample; -+} -+ -+#ifndef CONFIG_TRACING -+#define time_type ktime_t -+#define time_get() ktime_get() -+#define time_to_us(x) ktime_to_us(x) -+#define time_sub(a, b) ktime_sub(a, b) -+#define init_time(a, b) (a).tv64 = b -+#define time_u64(a) ((a).tv64) -+#else -+#define time_type u64 -+#define time_get() trace_clock_local() -+#define time_to_us(x) div_u64(x, 1000) -+#define time_sub(a, b) ((a) - (b)) -+#define init_time(a, b) (a = b) -+#define time_u64(a) a -+#endif -+/** -+ * get_sample - sample the CPU TSC and look for likely hardware latencies -+ * -+ * Used to repeatedly capture the CPU TSC (or similar), looking for potential -+ * hardware-induced latency. Called with interrupts disabled and with -+ * data.lock held. -+ */ -+static int get_sample(void) -+{ -+ time_type start, t1, t2, last_t2; -+ s64 diff, total = 0; -+ u64 sample = 0; -+ u64 outer_sample = 0; -+ int ret = -1; -+ -+ init_time(last_t2, 0); -+ start = time_get(); /* start timestamp */ -+ -+ do { -+ -+ t1 = time_get(); /* we'll look for a discontinuity */ -+ t2 = time_get(); -+ -+ if (time_u64(last_t2)) { -+ /* Check the delta from outer loop (t2 to next t1) */ -+ diff = time_to_us(time_sub(t1, last_t2)); -+ /* This shouldn't happen */ -+ if (diff < 0) { -+ pr_err(BANNER "time running backwards\n"); -+ goto out; -+ } -+ if (diff > outer_sample) -+ outer_sample = diff; -+ } -+ last_t2 = t2; -+ -+ total = time_to_us(time_sub(t2, start)); /* sample width */ -+ -+ /* This checks the inner loop (t1 to t2) */ -+ diff = time_to_us(time_sub(t2, t1)); /* current diff */ -+ -+ /* This shouldn't happen */ -+ if (diff < 0) { -+ pr_err(BANNER "time running backwards\n"); -+ goto out; -+ } -+ -+ if (diff > sample) -+ sample = diff; /* only want highest value */ -+ -+ } while (total <= data.sample_width); -+ -+ ret = 0; -+ -+ /* If we exceed the threshold value, we have found a hardware latency */ -+ if (sample > data.threshold || outer_sample > data.threshold) { -+ struct sample s; -+ -+ ret = 1; -+ -+ data.count++; -+ s.seqnum = data.count; -+ s.duration = sample; -+ s.outer_duration = outer_sample; -+ s.timestamp = CURRENT_TIME; -+ __buffer_add_sample(&s); -+ -+ /* Keep a running maximum ever recorded hardware latency */ -+ if (sample > data.max_sample) -+ data.max_sample = sample; -+ } -+ -+out: -+ return ret; -+} -+ -+/* -+ * kthread_fn - The CPU time sampling/hardware latency detection kernel thread -+ * @unused: A required part of the kthread API. -+ * -+ * Used to periodically sample the CPU TSC via a call to get_sample. We -+ * disable interrupts, which does (intentionally) introduce latency since we -+ * need to ensure nothing else might be running (and thus pre-empting). -+ * Obviously this should never be used in production environments. -+ * -+ * Currently this runs on which ever CPU it was scheduled on, but most -+ * real-worald hardware latency situations occur across several CPUs, -+ * but we might later generalize this if we find there are any actualy -+ * systems with alternate SMI delivery or other hardware latencies. -+ */ -+static int kthread_fn(void *unused) -+{ -+ int ret; -+ u64 interval; -+ -+ while (!kthread_should_stop()) { -+ -+ mutex_lock(&data.lock); -+ -+ local_irq_disable(); -+ ret = get_sample(); -+ local_irq_enable(); -+ -+ if (ret > 0) -+ wake_up(&data.wq); /* wake up reader(s) */ -+ -+ interval = data.sample_window - data.sample_width; -+ do_div(interval, USEC_PER_MSEC); /* modifies interval value */ -+ -+ mutex_unlock(&data.lock); -+ -+ if (msleep_interruptible(interval)) -+ break; -+ } -+ -+ return 0; -+} -+ -+/** -+ * start_kthread - Kick off the hardware latency sampling/detector kthread -+ * -+ * This starts a kernel thread that will sit and sample the CPU timestamp -+ * counter (TSC or similar) and look for potential hardware latencies. -+ */ -+static int start_kthread(void) -+{ -+ kthread = kthread_run(kthread_fn, NULL, -+ DRVNAME); -+ if (IS_ERR(kthread)) { -+ pr_err(BANNER "could not start sampling thread\n"); -+ enabled = 0; -+ return -ENOMEM; -+ } -+ -+ return 0; -+} -+ -+/** -+ * stop_kthread - Inform the hardware latency samping/detector kthread to stop -+ * -+ * This kicks the running hardware latency sampling/detector kernel thread and -+ * tells it to stop sampling now. Use this on unload and at system shutdown. -+ */ -+static int stop_kthread(void) -+{ -+ int ret; -+ -+ ret = kthread_stop(kthread); -+ -+ return ret; -+} -+ -+/** -+ * __reset_stats - Reset statistics for the hardware latency detector -+ * -+ * We use data to store various statistics and global state. We call this -+ * function in order to reset those when "enable" is toggled on or off, and -+ * also at initialization. Should be called with data.lock held. -+ */ -+static void __reset_stats(void) -+{ -+ data.count = 0; -+ data.max_sample = 0; -+ ring_buffer_reset(ring_buffer); /* flush out old sample entries */ -+} -+ -+/** -+ * init_stats - Setup global state statistics for the hardware latency detector -+ * -+ * We use data to store various statistics and global state. We also use -+ * a global ring buffer (ring_buffer) to keep raw samples of detected hardware -+ * induced system latencies. This function initializes these structures and -+ * allocates the global ring buffer also. -+ */ -+static int init_stats(void) -+{ -+ int ret = -ENOMEM; -+ -+ mutex_init(&data.lock); -+ init_waitqueue_head(&data.wq); -+ atomic_set(&data.sample_open, 0); -+ -+ ring_buffer = ring_buffer_alloc(buf_size, BUF_FLAGS); -+ -+ if (WARN(!ring_buffer, KERN_ERR BANNER -+ "failed to allocate ring buffer!\n")) -+ goto out; -+ -+ __reset_stats(); -+ data.threshold = threshold ?: DEFAULT_LAT_THRESHOLD; /* threshold us */ -+ data.sample_window = DEFAULT_SAMPLE_WINDOW; /* window us */ -+ data.sample_width = DEFAULT_SAMPLE_WIDTH; /* width us */ -+ -+ ret = 0; -+ -+out: -+ return ret; -+ -+} -+ -+/* -+ * simple_data_read - Wrapper read function for global state debugfs entries -+ * @filp: The active open file structure for the debugfs "file" -+ * @ubuf: The userspace provided buffer to read value into -+ * @cnt: The maximum number of bytes to read -+ * @ppos: The current "file" position -+ * @entry: The entry to read from -+ * -+ * This function provides a generic read implementation for the global state -+ * "data" structure debugfs filesystem entries. It would be nice to use -+ * simple_attr_read directly, but we need to make sure that the data.lock -+ * is held during the actual read. -+ */ -+static ssize_t simple_data_read(struct file *filp, char __user *ubuf, -+ size_t cnt, loff_t *ppos, const u64 *entry) -+{ -+ char buf[U64STR_SIZE]; -+ u64 val = 0; -+ int len = 0; -+ -+ memset(buf, 0, sizeof(buf)); -+ -+ if (!entry) -+ return -EFAULT; -+ -+ mutex_lock(&data.lock); -+ val = *entry; -+ mutex_unlock(&data.lock); -+ -+ len = snprintf(buf, sizeof(buf), "%llu\n", (unsigned long long)val); -+ -+ return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); -+ -+} -+ -+/* -+ * simple_data_write - Wrapper write function for global state debugfs entries -+ * @filp: The active open file structure for the debugfs "file" -+ * @ubuf: The userspace provided buffer to write value from -+ * @cnt: The maximum number of bytes to write -+ * @ppos: The current "file" position -+ * @entry: The entry to write to -+ * -+ * This function provides a generic write implementation for the global state -+ * "data" structure debugfs filesystem entries. It would be nice to use -+ * simple_attr_write directly, but we need to make sure that the data.lock -+ * is held during the actual write. -+ */ -+static ssize_t simple_data_write(struct file *filp, const char __user *ubuf, -+ size_t cnt, loff_t *ppos, u64 *entry) -+{ -+ char buf[U64STR_SIZE]; -+ int csize = min(cnt, sizeof(buf)); -+ u64 val = 0; -+ int err = 0; -+ -+ memset(buf, '\0', sizeof(buf)); -+ if (copy_from_user(buf, ubuf, csize)) -+ return -EFAULT; -+ -+ buf[U64STR_SIZE-1] = '\0'; /* just in case */ -+ err = kstrtoull(buf, 10, &val); -+ if (err) -+ return -EINVAL; -+ -+ mutex_lock(&data.lock); -+ *entry = val; -+ mutex_unlock(&data.lock); -+ -+ return csize; -+} -+ -+/** -+ * debug_count_fopen - Open function for "count" debugfs entry -+ * @inode: The in-kernel inode representation of the debugfs "file" -+ * @filp: The active open file structure for the debugfs "file" -+ * -+ * This function provides an open implementation for the "count" debugfs -+ * interface to the hardware latency detector. -+ */ -+static int debug_count_fopen(struct inode *inode, struct file *filp) -+{ -+ return 0; -+} -+ -+/** -+ * debug_count_fread - Read function for "count" debugfs entry -+ * @filp: The active open file structure for the debugfs "file" -+ * @ubuf: The userspace provided buffer to read value into -+ * @cnt: The maximum number of bytes to read -+ * @ppos: The current "file" position -+ * -+ * This function provides a read implementation for the "count" debugfs -+ * interface to the hardware latency detector. Can be used to read the -+ * number of latency readings exceeding the configured threshold since -+ * the detector was last reset (e.g. by writing a zero into "count"). -+ */ -+static ssize_t debug_count_fread(struct file *filp, char __user *ubuf, -+ size_t cnt, loff_t *ppos) -+{ -+ return simple_data_read(filp, ubuf, cnt, ppos, &data.count); -+} -+ -+/** -+ * debug_count_fwrite - Write function for "count" debugfs entry -+ * @filp: The active open file structure for the debugfs "file" -+ * @ubuf: The user buffer that contains the value to write -+ * @cnt: The maximum number of bytes to write to "file" -+ * @ppos: The current position in the debugfs "file" -+ * -+ * This function provides a write implementation for the "count" debugfs -+ * interface to the hardware latency detector. Can be used to write a -+ * desired value, especially to zero the total count. -+ */ -+static ssize_t debug_count_fwrite(struct file *filp, -+ const char __user *ubuf, -+ size_t cnt, -+ loff_t *ppos) -+{ -+ return simple_data_write(filp, ubuf, cnt, ppos, &data.count); -+} -+ -+/** -+ * debug_enable_fopen - Dummy open function for "enable" debugfs interface -+ * @inode: The in-kernel inode representation of the debugfs "file" -+ * @filp: The active open file structure for the debugfs "file" -+ * -+ * This function provides an open implementation for the "enable" debugfs -+ * interface to the hardware latency detector. -+ */ -+static int debug_enable_fopen(struct inode *inode, struct file *filp) -+{ -+ return 0; -+} -+ -+/** -+ * debug_enable_fread - Read function for "enable" debugfs interface -+ * @filp: The active open file structure for the debugfs "file" -+ * @ubuf: The userspace provided buffer to read value into -+ * @cnt: The maximum number of bytes to read -+ * @ppos: The current "file" position -+ * -+ * This function provides a read implementation for the "enable" debugfs -+ * interface to the hardware latency detector. Can be used to determine -+ * whether the detector is currently enabled ("0\n" or "1\n" returned). -+ */ -+static ssize_t debug_enable_fread(struct file *filp, char __user *ubuf, -+ size_t cnt, loff_t *ppos) -+{ -+ char buf[4]; -+ -+ if ((cnt < sizeof(buf)) || (*ppos)) -+ return 0; -+ -+ buf[0] = enabled ? '1' : '0'; -+ buf[1] = '\n'; -+ buf[2] = '\0'; -+ if (copy_to_user(ubuf, buf, strlen(buf))) -+ return -EFAULT; -+ return *ppos = strlen(buf); -+} -+ -+/** -+ * debug_enable_fwrite - Write function for "enable" debugfs interface -+ * @filp: The active open file structure for the debugfs "file" -+ * @ubuf: The user buffer that contains the value to write -+ * @cnt: The maximum number of bytes to write to "file" -+ * @ppos: The current position in the debugfs "file" -+ * -+ * This function provides a write implementation for the "enable" debugfs -+ * interface to the hardware latency detector. Can be used to enable or -+ * disable the detector, which will have the side-effect of possibly -+ * also resetting the global stats and kicking off the measuring -+ * kthread (on an enable) or the converse (upon a disable). -+ */ -+static ssize_t debug_enable_fwrite(struct file *filp, -+ const char __user *ubuf, -+ size_t cnt, -+ loff_t *ppos) -+{ -+ char buf[4]; -+ int csize = min(cnt, sizeof(buf)); -+ long val = 0; -+ int err = 0; -+ -+ memset(buf, '\0', sizeof(buf)); -+ if (copy_from_user(buf, ubuf, csize)) -+ return -EFAULT; -+ -+ buf[sizeof(buf)-1] = '\0'; /* just in case */ -+ err = kstrtoul(buf, 10, &val); -+ if (err) -+ return -EINVAL; -+ -+ if (val) { -+ if (enabled) -+ goto unlock; -+ enabled = 1; -+ __reset_stats(); -+ if (start_kthread()) -+ return -EFAULT; -+ } else { -+ if (!enabled) -+ goto unlock; -+ enabled = 0; -+ err = stop_kthread(); -+ if (err) { -+ pr_err(BANNER "cannot stop kthread\n"); -+ return -EFAULT; -+ } -+ wake_up(&data.wq); /* reader(s) should return */ -+ } -+unlock: -+ return csize; -+} -+ -+/** -+ * debug_max_fopen - Open function for "max" debugfs entry -+ * @inode: The in-kernel inode representation of the debugfs "file" -+ * @filp: The active open file structure for the debugfs "file" -+ * -+ * This function provides an open implementation for the "max" debugfs -+ * interface to the hardware latency detector. -+ */ -+static int debug_max_fopen(struct inode *inode, struct file *filp) -+{ -+ return 0; -+} -+ -+/** -+ * debug_max_fread - Read function for "max" debugfs entry -+ * @filp: The active open file structure for the debugfs "file" -+ * @ubuf: The userspace provided buffer to read value into -+ * @cnt: The maximum number of bytes to read -+ * @ppos: The current "file" position -+ * -+ * This function provides a read implementation for the "max" debugfs -+ * interface to the hardware latency detector. Can be used to determine -+ * the maximum latency value observed since it was last reset. -+ */ -+static ssize_t debug_max_fread(struct file *filp, char __user *ubuf, -+ size_t cnt, loff_t *ppos) -+{ -+ return simple_data_read(filp, ubuf, cnt, ppos, &data.max_sample); -+} -+ -+/** -+ * debug_max_fwrite - Write function for "max" debugfs entry -+ * @filp: The active open file structure for the debugfs "file" -+ * @ubuf: The user buffer that contains the value to write -+ * @cnt: The maximum number of bytes to write to "file" -+ * @ppos: The current position in the debugfs "file" -+ * -+ * This function provides a write implementation for the "max" debugfs -+ * interface to the hardware latency detector. Can be used to reset the -+ * maximum or set it to some other desired value - if, then, subsequent -+ * measurements exceed this value, the maximum will be updated. -+ */ -+static ssize_t debug_max_fwrite(struct file *filp, -+ const char __user *ubuf, -+ size_t cnt, -+ loff_t *ppos) -+{ -+ return simple_data_write(filp, ubuf, cnt, ppos, &data.max_sample); -+} -+ -+ -+/** -+ * debug_sample_fopen - An open function for "sample" debugfs interface -+ * @inode: The in-kernel inode representation of this debugfs "file" -+ * @filp: The active open file structure for the debugfs "file" -+ * -+ * This function handles opening the "sample" file within the hardware -+ * latency detector debugfs directory interface. This file is used to read -+ * raw samples from the global ring_buffer and allows the user to see a -+ * running latency history. Can be opened blocking or non-blocking, -+ * affecting whether it behaves as a buffer read pipe, or does not. -+ * Implements simple locking to prevent multiple simultaneous use. -+ */ -+static int debug_sample_fopen(struct inode *inode, struct file *filp) -+{ -+ if (!atomic_add_unless(&data.sample_open, 1, 1)) -+ return -EBUSY; -+ else -+ return 0; -+} -+ -+/** -+ * debug_sample_fread - A read function for "sample" debugfs interface -+ * @filp: The active open file structure for the debugfs "file" -+ * @ubuf: The user buffer that will contain the samples read -+ * @cnt: The maximum bytes to read from the debugfs "file" -+ * @ppos: The current position in the debugfs "file" -+ * -+ * This function handles reading from the "sample" file within the hardware -+ * latency detector debugfs directory interface. This file is used to read -+ * raw samples from the global ring_buffer and allows the user to see a -+ * running latency history. By default this will block pending a new -+ * value written into the sample buffer, unless there are already a -+ * number of value(s) waiting in the buffer, or the sample file was -+ * previously opened in a non-blocking mode of operation. -+ */ -+static ssize_t debug_sample_fread(struct file *filp, char __user *ubuf, -+ size_t cnt, loff_t *ppos) -+{ -+ int len = 0; -+ char buf[64]; -+ struct sample *sample = NULL; -+ -+ if (!enabled) -+ return 0; -+ -+ sample = kzalloc(sizeof(struct sample), GFP_KERNEL); -+ if (!sample) -+ return -ENOMEM; -+ -+ while (!buffer_get_sample(sample)) { -+ -+ DEFINE_WAIT(wait); -+ -+ if (filp->f_flags & O_NONBLOCK) { -+ len = -EAGAIN; -+ goto out; -+ } -+ -+ prepare_to_wait(&data.wq, &wait, TASK_INTERRUPTIBLE); -+ schedule(); -+ finish_wait(&data.wq, &wait); -+ -+ if (signal_pending(current)) { -+ len = -EINTR; -+ goto out; -+ } -+ -+ if (!enabled) { /* enable was toggled */ -+ len = 0; -+ goto out; -+ } -+ } -+ -+ len = snprintf(buf, sizeof(buf), "%010lu.%010lu\t%llu\t%llu\n", -+ sample->timestamp.tv_sec, -+ sample->timestamp.tv_nsec, -+ sample->duration, -+ sample->outer_duration); -+ -+ -+ /* handling partial reads is more trouble than it's worth */ -+ if (len > cnt) -+ goto out; -+ -+ if (copy_to_user(ubuf, buf, len)) -+ len = -EFAULT; -+ -+out: -+ kfree(sample); -+ return len; -+} -+ -+/** -+ * debug_sample_release - Release function for "sample" debugfs interface -+ * @inode: The in-kernel inode represenation of the debugfs "file" -+ * @filp: The active open file structure for the debugfs "file" -+ * -+ * This function completes the close of the debugfs interface "sample" file. -+ * Frees the sample_open "lock" so that other users may open the interface. -+ */ -+static int debug_sample_release(struct inode *inode, struct file *filp) -+{ -+ atomic_dec(&data.sample_open); -+ -+ return 0; -+} -+ -+/** -+ * debug_threshold_fopen - Open function for "threshold" debugfs entry -+ * @inode: The in-kernel inode representation of the debugfs "file" -+ * @filp: The active open file structure for the debugfs "file" -+ * -+ * This function provides an open implementation for the "threshold" debugfs -+ * interface to the hardware latency detector. -+ */ -+static int debug_threshold_fopen(struct inode *inode, struct file *filp) -+{ -+ return 0; -+} -+ -+/** -+ * debug_threshold_fread - Read function for "threshold" debugfs entry -+ * @filp: The active open file structure for the debugfs "file" -+ * @ubuf: The userspace provided buffer to read value into -+ * @cnt: The maximum number of bytes to read -+ * @ppos: The current "file" position -+ * -+ * This function provides a read implementation for the "threshold" debugfs -+ * interface to the hardware latency detector. It can be used to determine -+ * the current threshold level at which a latency will be recorded in the -+ * global ring buffer, typically on the order of 10us. -+ */ -+static ssize_t debug_threshold_fread(struct file *filp, char __user *ubuf, -+ size_t cnt, loff_t *ppos) -+{ -+ return simple_data_read(filp, ubuf, cnt, ppos, &data.threshold); -+} -+ -+/** -+ * debug_threshold_fwrite - Write function for "threshold" debugfs entry -+ * @filp: The active open file structure for the debugfs "file" -+ * @ubuf: The user buffer that contains the value to write -+ * @cnt: The maximum number of bytes to write to "file" -+ * @ppos: The current position in the debugfs "file" -+ * -+ * This function provides a write implementation for the "threshold" debugfs -+ * interface to the hardware latency detector. It can be used to configure -+ * the threshold level at which any subsequently detected latencies will -+ * be recorded into the global ring buffer. -+ */ -+static ssize_t debug_threshold_fwrite(struct file *filp, -+ const char __user *ubuf, -+ size_t cnt, -+ loff_t *ppos) -+{ -+ int ret; -+ -+ ret = simple_data_write(filp, ubuf, cnt, ppos, &data.threshold); -+ -+ if (enabled) -+ wake_up_process(kthread); -+ -+ return ret; -+} -+ -+/** -+ * debug_width_fopen - Open function for "width" debugfs entry -+ * @inode: The in-kernel inode representation of the debugfs "file" -+ * @filp: The active open file structure for the debugfs "file" -+ * -+ * This function provides an open implementation for the "width" debugfs -+ * interface to the hardware latency detector. -+ */ -+static int debug_width_fopen(struct inode *inode, struct file *filp) -+{ -+ return 0; -+} -+ -+/** -+ * debug_width_fread - Read function for "width" debugfs entry -+ * @filp: The active open file structure for the debugfs "file" -+ * @ubuf: The userspace provided buffer to read value into -+ * @cnt: The maximum number of bytes to read -+ * @ppos: The current "file" position -+ * -+ * This function provides a read implementation for the "width" debugfs -+ * interface to the hardware latency detector. It can be used to determine -+ * for how many us of the total window us we will actively sample for any -+ * hardware-induced latecy periods. Obviously, it is not possible to -+ * sample constantly and have the system respond to a sample reader, or, -+ * worse, without having the system appear to have gone out to lunch. -+ */ -+static ssize_t debug_width_fread(struct file *filp, char __user *ubuf, -+ size_t cnt, loff_t *ppos) -+{ -+ return simple_data_read(filp, ubuf, cnt, ppos, &data.sample_width); -+} -+ -+/** -+ * debug_width_fwrite - Write function for "width" debugfs entry -+ * @filp: The active open file structure for the debugfs "file" -+ * @ubuf: The user buffer that contains the value to write -+ * @cnt: The maximum number of bytes to write to "file" -+ * @ppos: The current position in the debugfs "file" -+ * -+ * This function provides a write implementation for the "width" debugfs -+ * interface to the hardware latency detector. It can be used to configure -+ * for how many us of the total window us we will actively sample for any -+ * hardware-induced latency periods. Obviously, it is not possible to -+ * sample constantly and have the system respond to a sample reader, or, -+ * worse, without having the system appear to have gone out to lunch. It -+ * is enforced that width is less that the total window size. -+ */ -+static ssize_t debug_width_fwrite(struct file *filp, -+ const char __user *ubuf, -+ size_t cnt, -+ loff_t *ppos) -+{ -+ char buf[U64STR_SIZE]; -+ int csize = min(cnt, sizeof(buf)); -+ u64 val = 0; -+ int err = 0; -+ -+ memset(buf, '\0', sizeof(buf)); -+ if (copy_from_user(buf, ubuf, csize)) -+ return -EFAULT; -+ -+ buf[U64STR_SIZE-1] = '\0'; /* just in case */ -+ err = kstrtoull(buf, 10, &val); -+ if (err) -+ return -EINVAL; -+ -+ mutex_lock(&data.lock); -+ if (val < data.sample_window) -+ data.sample_width = val; -+ else { -+ mutex_unlock(&data.lock); -+ return -EINVAL; -+ } -+ mutex_unlock(&data.lock); -+ -+ if (enabled) -+ wake_up_process(kthread); -+ -+ return csize; -+} -+ -+/** -+ * debug_window_fopen - Open function for "window" debugfs entry -+ * @inode: The in-kernel inode representation of the debugfs "file" -+ * @filp: The active open file structure for the debugfs "file" -+ * -+ * This function provides an open implementation for the "window" debugfs -+ * interface to the hardware latency detector. The window is the total time -+ * in us that will be considered one sample period. Conceptually, windows -+ * occur back-to-back and contain a sample width period during which -+ * actual sampling occurs. -+ */ -+static int debug_window_fopen(struct inode *inode, struct file *filp) -+{ -+ return 0; -+} -+ -+/** -+ * debug_window_fread - Read function for "window" debugfs entry -+ * @filp: The active open file structure for the debugfs "file" -+ * @ubuf: The userspace provided buffer to read value into -+ * @cnt: The maximum number of bytes to read -+ * @ppos: The current "file" position -+ * -+ * This function provides a read implementation for the "window" debugfs -+ * interface to the hardware latency detector. The window is the total time -+ * in us that will be considered one sample period. Conceptually, windows -+ * occur back-to-back and contain a sample width period during which -+ * actual sampling occurs. Can be used to read the total window size. -+ */ -+static ssize_t debug_window_fread(struct file *filp, char __user *ubuf, -+ size_t cnt, loff_t *ppos) -+{ -+ return simple_data_read(filp, ubuf, cnt, ppos, &data.sample_window); -+} -+ -+/** -+ * debug_window_fwrite - Write function for "window" debugfs entry -+ * @filp: The active open file structure for the debugfs "file" -+ * @ubuf: The user buffer that contains the value to write -+ * @cnt: The maximum number of bytes to write to "file" -+ * @ppos: The current position in the debugfs "file" -+ * -+ * This function provides a write implementation for the "window" debufds -+ * interface to the hardware latency detetector. The window is the total time -+ * in us that will be considered one sample period. Conceptually, windows -+ * occur back-to-back and contain a sample width period during which -+ * actual sampling occurs. Can be used to write a new total window size. It -+ * is enfoced that any value written must be greater than the sample width -+ * size, or an error results. -+ */ -+static ssize_t debug_window_fwrite(struct file *filp, -+ const char __user *ubuf, -+ size_t cnt, -+ loff_t *ppos) -+{ -+ char buf[U64STR_SIZE]; -+ int csize = min(cnt, sizeof(buf)); -+ u64 val = 0; -+ int err = 0; -+ -+ memset(buf, '\0', sizeof(buf)); -+ if (copy_from_user(buf, ubuf, csize)) -+ return -EFAULT; -+ -+ buf[U64STR_SIZE-1] = '\0'; /* just in case */ -+ err = kstrtoull(buf, 10, &val); -+ if (err) -+ return -EINVAL; -+ -+ mutex_lock(&data.lock); -+ if (data.sample_width < val) -+ data.sample_window = val; -+ else { -+ mutex_unlock(&data.lock); -+ return -EINVAL; -+ } -+ mutex_unlock(&data.lock); -+ -+ return csize; -+} -+ -+/* -+ * Function pointers for the "count" debugfs file operations -+ */ -+static const struct file_operations count_fops = { -+ .open = debug_count_fopen, -+ .read = debug_count_fread, -+ .write = debug_count_fwrite, -+ .owner = THIS_MODULE, -+}; -+ -+/* -+ * Function pointers for the "enable" debugfs file operations -+ */ -+static const struct file_operations enable_fops = { -+ .open = debug_enable_fopen, -+ .read = debug_enable_fread, -+ .write = debug_enable_fwrite, -+ .owner = THIS_MODULE, -+}; -+ -+/* -+ * Function pointers for the "max" debugfs file operations -+ */ -+static const struct file_operations max_fops = { -+ .open = debug_max_fopen, -+ .read = debug_max_fread, -+ .write = debug_max_fwrite, -+ .owner = THIS_MODULE, -+}; -+ -+/* -+ * Function pointers for the "sample" debugfs file operations -+ */ -+static const struct file_operations sample_fops = { -+ .open = debug_sample_fopen, -+ .read = debug_sample_fread, -+ .release = debug_sample_release, -+ .owner = THIS_MODULE, -+}; -+ -+/* -+ * Function pointers for the "threshold" debugfs file operations -+ */ -+static const struct file_operations threshold_fops = { -+ .open = debug_threshold_fopen, -+ .read = debug_threshold_fread, -+ .write = debug_threshold_fwrite, -+ .owner = THIS_MODULE, -+}; -+ -+/* -+ * Function pointers for the "width" debugfs file operations -+ */ -+static const struct file_operations width_fops = { -+ .open = debug_width_fopen, -+ .read = debug_width_fread, -+ .write = debug_width_fwrite, -+ .owner = THIS_MODULE, -+}; -+ -+/* -+ * Function pointers for the "window" debugfs file operations -+ */ -+static const struct file_operations window_fops = { -+ .open = debug_window_fopen, -+ .read = debug_window_fread, -+ .write = debug_window_fwrite, -+ .owner = THIS_MODULE, -+}; -+ -+/** -+ * init_debugfs - A function to initialize the debugfs interface files -+ * -+ * This function creates entries in debugfs for "hwlat_detector", including -+ * files to read values from the detector, current samples, and the -+ * maximum sample that has been captured since the hardware latency -+ * dectector was started. -+ */ -+static int init_debugfs(void) -+{ -+ int ret = -ENOMEM; -+ -+ debug_dir = debugfs_create_dir(DRVNAME, NULL); -+ if (!debug_dir) -+ goto err_debug_dir; -+ -+ debug_sample = debugfs_create_file("sample", 0444, -+ debug_dir, NULL, -+ &sample_fops); -+ if (!debug_sample) -+ goto err_sample; -+ -+ debug_count = debugfs_create_file("count", 0444, -+ debug_dir, NULL, -+ &count_fops); -+ if (!debug_count) -+ goto err_count; -+ -+ debug_max = debugfs_create_file("max", 0444, -+ debug_dir, NULL, -+ &max_fops); -+ if (!debug_max) -+ goto err_max; -+ -+ debug_sample_window = debugfs_create_file("window", 0644, -+ debug_dir, NULL, -+ &window_fops); -+ if (!debug_sample_window) -+ goto err_window; -+ -+ debug_sample_width = debugfs_create_file("width", 0644, -+ debug_dir, NULL, -+ &width_fops); -+ if (!debug_sample_width) -+ goto err_width; -+ -+ debug_threshold = debugfs_create_file("threshold", 0644, -+ debug_dir, NULL, -+ &threshold_fops); -+ if (!debug_threshold) -+ goto err_threshold; -+ -+ debug_enable = debugfs_create_file("enable", 0644, -+ debug_dir, &enabled, -+ &enable_fops); -+ if (!debug_enable) -+ goto err_enable; -+ -+ else { -+ ret = 0; -+ goto out; -+ } -+ -+err_enable: -+ debugfs_remove(debug_threshold); -+err_threshold: -+ debugfs_remove(debug_sample_width); -+err_width: -+ debugfs_remove(debug_sample_window); -+err_window: -+ debugfs_remove(debug_max); -+err_max: -+ debugfs_remove(debug_count); -+err_count: -+ debugfs_remove(debug_sample); -+err_sample: -+ debugfs_remove(debug_dir); -+err_debug_dir: -+out: -+ return ret; -+} -+ -+/** -+ * free_debugfs - A function to cleanup the debugfs file interface -+ */ -+static void free_debugfs(void) -+{ -+ /* could also use a debugfs_remove_recursive */ -+ debugfs_remove(debug_enable); -+ debugfs_remove(debug_threshold); -+ debugfs_remove(debug_sample_width); -+ debugfs_remove(debug_sample_window); -+ debugfs_remove(debug_max); -+ debugfs_remove(debug_count); -+ debugfs_remove(debug_sample); -+ debugfs_remove(debug_dir); -+} -+ -+/** -+ * detector_init - Standard module initialization code -+ */ -+static int detector_init(void) -+{ -+ int ret = -ENOMEM; -+ -+ pr_info(BANNER "version %s\n", VERSION); -+ -+ ret = init_stats(); -+ if (ret) -+ goto out; -+ -+ ret = init_debugfs(); -+ if (ret) -+ goto err_stats; -+ -+ if (enabled) -+ ret = start_kthread(); -+ -+ goto out; -+ -+err_stats: -+ ring_buffer_free(ring_buffer); -+out: -+ return ret; -+ -+} -+ -+/** -+ * detector_exit - Standard module cleanup code -+ */ -+static void detector_exit(void) -+{ -+ int err; -+ -+ if (enabled) { -+ enabled = 0; -+ err = stop_kthread(); -+ if (err) -+ pr_err(BANNER "cannot stop kthread\n"); -+ } -+ -+ free_debugfs(); -+ ring_buffer_free(ring_buffer); /* free up the ring buffer */ -+ -+} -+ -+module_init(detector_init); -+module_exit(detector_exit); -diff --git a/drivers/mmc/host/jz4740_mmc.c b/drivers/mmc/host/jz4740_mmc.c -index 03ddf0ecf402..684087db170b 100644 ---- a/drivers/mmc/host/jz4740_mmc.c -+++ b/drivers/mmc/host/jz4740_mmc.c -@@ -1068,8 +1068,6 @@ static int jz4740_mmc_probe(struct platform_device* pdev) - jz4740_mmc_clock_disable(host); - setup_timer(&host->timeout_timer, jz4740_mmc_timeout, - (unsigned long)host); -- /* It is not important when it times out, it just needs to timeout. */ -- set_timer_slack(&host->timeout_timer, HZ); - - host->use_dma = true; - if (host->use_dma && jz4740_mmc_acquire_dma_channels(host) != 0) -diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c -index 2e6c96845c9a..578ddbeab8ed 100644 ---- a/drivers/mmc/host/mmci.c -+++ b/drivers/mmc/host/mmci.c -@@ -1155,15 +1155,12 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id) - struct sg_mapping_iter *sg_miter = &host->sg_miter; - struct variant_data *variant = host->variant; - void __iomem *base = host->base; -- unsigned long flags; - u32 status; - - status = readl(base + MMCISTATUS); - - dev_dbg(mmc_dev(host->mmc), "irq1 (pio) %08x\n", status); - -- local_irq_save(flags); -- - do { - unsigned int remain, len; - char *buffer; -@@ -1203,8 +1200,6 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id) - - sg_miter_stop(sg_miter); - -- local_irq_restore(flags); -- - /* - * If we have less than the fifo 'half-full' threshold to transfer, - * trigger a PIO interrupt as soon as any data is available. -diff --git a/drivers/net/ethernet/3com/3c59x.c b/drivers/net/ethernet/3com/3c59x.c -index d81fceddbe0e..dbcecb8845c6 100644 ---- a/drivers/net/ethernet/3com/3c59x.c -+++ b/drivers/net/ethernet/3com/3c59x.c -@@ -842,9 +842,9 @@ static void poll_vortex(struct net_device *dev) - { - struct vortex_private *vp = netdev_priv(dev); - unsigned long flags; -- local_irq_save(flags); -+ local_irq_save_nort(flags); - (vp->full_bus_master_rx ? boomerang_interrupt:vortex_interrupt)(dev->irq,dev); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - } - #endif - -@@ -1910,12 +1910,12 @@ static void vortex_tx_timeout(struct net_device *dev) - * Block interrupts because vortex_interrupt does a bare spin_lock() - */ - unsigned long flags; -- local_irq_save(flags); -+ local_irq_save_nort(flags); - if (vp->full_bus_master_tx) - boomerang_interrupt(dev->irq, dev); - else - vortex_interrupt(dev->irq, dev); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - } - } - -diff --git a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c -index d0084d4d1a9b..38370772f5dc 100644 ---- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c -+++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c -@@ -2217,11 +2217,7 @@ static netdev_tx_t atl1c_xmit_frame(struct sk_buff *skb, - } - - tpd_req = atl1c_cal_tpd_req(skb); -- if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) { -- if (netif_msg_pktdata(adapter)) -- dev_info(&adapter->pdev->dev, "tx locked\n"); -- return NETDEV_TX_LOCKED; -- } -+ spin_lock_irqsave(&adapter->tx_lock, flags); - - if (atl1c_tpd_avail(adapter, type) < tpd_req) { - /* no enough descriptor, just stop queue */ -diff --git a/drivers/net/ethernet/atheros/atl1e/atl1e_main.c b/drivers/net/ethernet/atheros/atl1e/atl1e_main.c -index 59a03a193e83..734f7a7ad2c3 100644 ---- a/drivers/net/ethernet/atheros/atl1e/atl1e_main.c -+++ b/drivers/net/ethernet/atheros/atl1e/atl1e_main.c -@@ -1880,8 +1880,7 @@ static netdev_tx_t atl1e_xmit_frame(struct sk_buff *skb, - return NETDEV_TX_OK; - } - tpd_req = atl1e_cal_tdp_req(skb); -- if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) -- return NETDEV_TX_LOCKED; -+ spin_lock_irqsave(&adapter->tx_lock, flags); - - if (atl1e_tpd_avail(adapter) < tpd_req) { - /* no enough descriptor, just stop queue */ -diff --git a/drivers/net/ethernet/chelsio/cxgb/sge.c b/drivers/net/ethernet/chelsio/cxgb/sge.c -index 526ea74e82d9..86f467a2c485 100644 ---- a/drivers/net/ethernet/chelsio/cxgb/sge.c -+++ b/drivers/net/ethernet/chelsio/cxgb/sge.c -@@ -1664,8 +1664,7 @@ static int t1_sge_tx(struct sk_buff *skb, struct adapter *adapter, - struct cmdQ *q = &sge->cmdQ[qid]; - unsigned int credits, pidx, genbit, count, use_sched_skb = 0; - -- if (!spin_trylock(&q->lock)) -- return NETDEV_TX_LOCKED; -+ spin_lock(&q->lock); - - reclaim_completed_tx(sge, q); - -diff --git a/drivers/net/ethernet/neterion/s2io.c b/drivers/net/ethernet/neterion/s2io.c -index 9ba975853ec6..813cfa698160 100644 ---- a/drivers/net/ethernet/neterion/s2io.c -+++ b/drivers/net/ethernet/neterion/s2io.c -@@ -4084,12 +4084,7 @@ static netdev_tx_t s2io_xmit(struct sk_buff *skb, struct net_device *dev) - [skb->priority & (MAX_TX_FIFOS - 1)]; - fifo = &mac_control->fifos[queue]; - -- if (do_spin_lock) -- spin_lock_irqsave(&fifo->tx_lock, flags); -- else { -- if (unlikely(!spin_trylock_irqsave(&fifo->tx_lock, flags))) -- return NETDEV_TX_LOCKED; -- } -+ spin_lock_irqsave(&fifo->tx_lock, flags); - - if (sp->config.multiq) { - if (__netif_subqueue_stopped(dev, fifo->fifo_no)) { -diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c -index 3b98b263bad0..ca4add749410 100644 ---- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c -+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c -@@ -2137,10 +2137,8 @@ static int pch_gbe_xmit_frame(struct sk_buff *skb, struct net_device *netdev) - struct pch_gbe_tx_ring *tx_ring = adapter->tx_ring; - unsigned long flags; - -- if (!spin_trylock_irqsave(&tx_ring->tx_lock, flags)) { -- /* Collision - tell upper layer to requeue */ -- return NETDEV_TX_LOCKED; -- } -+ spin_lock_irqsave(&tx_ring->tx_lock, flags); -+ - if (unlikely(!PCH_GBE_DESC_UNUSED(tx_ring))) { - netif_stop_queue(netdev); - spin_unlock_irqrestore(&tx_ring->tx_lock, flags); -diff --git a/drivers/net/ethernet/realtek/8139too.c b/drivers/net/ethernet/realtek/8139too.c -index ef668d300800..d987d571fdd6 100644 ---- a/drivers/net/ethernet/realtek/8139too.c -+++ b/drivers/net/ethernet/realtek/8139too.c -@@ -2229,7 +2229,7 @@ static void rtl8139_poll_controller(struct net_device *dev) - struct rtl8139_private *tp = netdev_priv(dev); - const int irq = tp->pci_dev->irq; - -- disable_irq(irq); -+ disable_irq_nosync(irq); - rtl8139_interrupt(irq, dev); - enable_irq(irq); - } -diff --git a/drivers/net/ethernet/tehuti/tehuti.c b/drivers/net/ethernet/tehuti/tehuti.c -index 14c9d1baa85c..e1a5305418a8 100644 ---- a/drivers/net/ethernet/tehuti/tehuti.c -+++ b/drivers/net/ethernet/tehuti/tehuti.c -@@ -1629,13 +1629,8 @@ static netdev_tx_t bdx_tx_transmit(struct sk_buff *skb, - unsigned long flags; - - ENTER; -- local_irq_save(flags); -- if (!spin_trylock(&priv->tx_lock)) { -- local_irq_restore(flags); -- DBG("%s[%s]: TX locked, returning NETDEV_TX_LOCKED\n", -- BDX_DRV_NAME, ndev->name); -- return NETDEV_TX_LOCKED; -- } -+ -+ spin_lock_irqsave(&priv->tx_lock, flags); - - /* build tx descriptor */ - BDX_ASSERT(f->m.wptr >= f->m.memsz); /* started with valid wptr */ -diff --git a/drivers/net/ethernet/tile/tilepro.c b/drivers/net/ethernet/tile/tilepro.c -index 298e059d0498..ea5d774fc89b 100644 ---- a/drivers/net/ethernet/tile/tilepro.c -+++ b/drivers/net/ethernet/tile/tilepro.c -@@ -588,7 +588,7 @@ static bool tile_net_lepp_free_comps(struct net_device *dev, bool all) - static void tile_net_schedule_egress_timer(struct tile_net_cpu *info) - { - if (!info->egress_timer_scheduled) { -- mod_timer_pinned(&info->egress_timer, jiffies + 1); -+ mod_timer(&info->egress_timer, jiffies + 1); - info->egress_timer_scheduled = true; - } - } -@@ -1004,7 +1004,7 @@ static void tile_net_register(void *dev_ptr) - BUG(); - - /* Initialize the egress timer. */ -- init_timer(&info->egress_timer); -+ init_timer_pinned(&info->egress_timer); - info->egress_timer.data = (long)info; - info->egress_timer.function = tile_net_handle_egress_timer; - -diff --git a/drivers/net/rionet.c b/drivers/net/rionet.c -index 9cfe6aeac84e..a31f4610b493 100644 ---- a/drivers/net/rionet.c -+++ b/drivers/net/rionet.c -@@ -179,11 +179,7 @@ static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev) - unsigned long flags; - int add_num = 1; - -- local_irq_save(flags); -- if (!spin_trylock(&rnet->tx_lock)) { -- local_irq_restore(flags); -- return NETDEV_TX_LOCKED; -- } -+ spin_lock_irqsave(&rnet->tx_lock, flags); - - if (is_multicast_ether_addr(eth->h_dest)) - add_num = nets[rnet->mport->id].nact; -diff --git a/drivers/net/wireless/intersil/orinoco/orinoco_usb.c b/drivers/net/wireless/intersil/orinoco/orinoco_usb.c -index f2cd513d54b2..6c0f4c9638a2 100644 ---- a/drivers/net/wireless/intersil/orinoco/orinoco_usb.c -+++ b/drivers/net/wireless/intersil/orinoco/orinoco_usb.c -@@ -697,7 +697,7 @@ static void ezusb_req_ctx_wait(struct ezusb_priv *upriv, - while (!ctx->done.done && msecs--) - udelay(1000); - } else { -- wait_event_interruptible(ctx->done.wait, -+ swait_event_interruptible(ctx->done.wait, - ctx->done.done); - } - break; -diff --git a/drivers/pci/access.c b/drivers/pci/access.c -index d11cdbb8fba3..223bbb9acb03 100644 ---- a/drivers/pci/access.c -+++ b/drivers/pci/access.c -@@ -672,7 +672,7 @@ void pci_cfg_access_unlock(struct pci_dev *dev) - WARN_ON(!dev->block_cfg_access); - - dev->block_cfg_access = 0; -- wake_up_all(&pci_cfg_wait); -+ wake_up_all_locked(&pci_cfg_wait); - raw_spin_unlock_irqrestore(&pci_lock, flags); - } - EXPORT_SYMBOL_GPL(pci_cfg_access_unlock); -diff --git a/drivers/power/bq27xxx_battery.c b/drivers/power/bq27xxx_battery.c -index 45f6ebf88df6..e90b3f307e0f 100644 ---- a/drivers/power/bq27xxx_battery.c -+++ b/drivers/power/bq27xxx_battery.c -@@ -735,11 +735,8 @@ static void bq27xxx_battery_poll(struct work_struct *work) - - bq27xxx_battery_update(di); - -- if (poll_interval > 0) { -- /* The timer does not have to be accurate. */ -- set_timer_slack(&di->work.timer, poll_interval * HZ / 4); -+ if (poll_interval > 0) - schedule_delayed_work(&di->work, poll_interval * HZ); -- } - } - - /* -diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c -index 0efe7112fc1f..3d232657218d 100644 ---- a/drivers/scsi/fcoe/fcoe.c -+++ b/drivers/scsi/fcoe/fcoe.c -@@ -1286,7 +1286,7 @@ static void fcoe_percpu_thread_destroy(unsigned int cpu) - struct sk_buff *skb; - #ifdef CONFIG_SMP - struct fcoe_percpu_s *p0; -- unsigned targ_cpu = get_cpu(); -+ unsigned targ_cpu = get_cpu_light(); - #endif /* CONFIG_SMP */ - - FCOE_DBG("Destroying receive thread for CPU %d\n", cpu); -@@ -1342,7 +1342,7 @@ static void fcoe_percpu_thread_destroy(unsigned int cpu) - kfree_skb(skb); - spin_unlock_bh(&p->fcoe_rx_list.lock); - } -- put_cpu(); -+ put_cpu_light(); - #else - /* - * This a non-SMP scenario where the singular Rx thread is -@@ -1566,11 +1566,11 @@ static int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev, - static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen) - { - struct fcoe_percpu_s *fps; -- int rc; -+ int rc, cpu = get_cpu_light(); - -- fps = &get_cpu_var(fcoe_percpu); -+ fps = &per_cpu(fcoe_percpu, cpu); - rc = fcoe_get_paged_crc_eof(skb, tlen, fps); -- put_cpu_var(fcoe_percpu); -+ put_cpu_light(); - - return rc; - } -@@ -1766,11 +1766,11 @@ static inline int fcoe_filter_frames(struct fc_lport *lport, - return 0; - } - -- stats = per_cpu_ptr(lport->stats, get_cpu()); -+ stats = per_cpu_ptr(lport->stats, get_cpu_light()); - stats->InvalidCRCCount++; - if (stats->InvalidCRCCount < 5) - printk(KERN_WARNING "fcoe: dropping frame with CRC error\n"); -- put_cpu(); -+ put_cpu_light(); - return -EINVAL; - } - -@@ -1846,13 +1846,13 @@ static void fcoe_recv_frame(struct sk_buff *skb) - goto drop; - - if (!fcoe_filter_frames(lport, fp)) { -- put_cpu(); -+ put_cpu_light(); - fc_exch_recv(lport, fp); - return; - } - drop: - stats->ErrorFrames++; -- put_cpu(); -+ put_cpu_light(); - kfree_skb(skb); - } - -diff --git a/drivers/scsi/fcoe/fcoe_ctlr.c b/drivers/scsi/fcoe/fcoe_ctlr.c -index 3e83d485f743..bc69ff93127c 100644 ---- a/drivers/scsi/fcoe/fcoe_ctlr.c -+++ b/drivers/scsi/fcoe/fcoe_ctlr.c -@@ -831,7 +831,7 @@ static unsigned long fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip) - - INIT_LIST_HEAD(&del_list); - -- stats = per_cpu_ptr(fip->lp->stats, get_cpu()); -+ stats = per_cpu_ptr(fip->lp->stats, get_cpu_light()); - - list_for_each_entry_safe(fcf, next, &fip->fcfs, list) { - deadline = fcf->time + fcf->fka_period + fcf->fka_period / 2; -@@ -867,7 +867,7 @@ static unsigned long fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip) - sel_time = fcf->time; - } - } -- put_cpu(); -+ put_cpu_light(); - - list_for_each_entry_safe(fcf, next, &del_list, list) { - /* Removes fcf from current list */ -diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c -index 30f9ef0c0d4f..6c686bc01a82 100644 ---- a/drivers/scsi/libfc/fc_exch.c -+++ b/drivers/scsi/libfc/fc_exch.c -@@ -814,10 +814,10 @@ static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport, - } - memset(ep, 0, sizeof(*ep)); - -- cpu = get_cpu(); -+ cpu = get_cpu_light(); - pool = per_cpu_ptr(mp->pool, cpu); - spin_lock_bh(&pool->lock); -- put_cpu(); -+ put_cpu_light(); - - /* peek cache of free slot */ - if (pool->left != FC_XID_UNKNOWN) { -diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c -index 9c706d8c1441..d968ffc79c08 100644 ---- a/drivers/scsi/libsas/sas_ata.c -+++ b/drivers/scsi/libsas/sas_ata.c -@@ -190,7 +190,7 @@ static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc) - /* TODO: audit callers to ensure they are ready for qc_issue to - * unconditionally re-enable interrupts - */ -- local_irq_save(flags); -+ local_irq_save_nort(flags); - spin_unlock(ap->lock); - - /* If the device fell off, no sense in issuing commands */ -@@ -255,7 +255,7 @@ static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc) - - out: - spin_lock(ap->lock); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - return ret; - } - -diff --git a/drivers/scsi/qla2xxx/qla_inline.h b/drivers/scsi/qla2xxx/qla_inline.h -index edc48f3b8230..ee5c6f9dfb6f 100644 ---- a/drivers/scsi/qla2xxx/qla_inline.h -+++ b/drivers/scsi/qla2xxx/qla_inline.h -@@ -59,12 +59,12 @@ qla2x00_poll(struct rsp_que *rsp) - { - unsigned long flags; - struct qla_hw_data *ha = rsp->hw; -- local_irq_save(flags); -+ local_irq_save_nort(flags); - if (IS_P3P_TYPE(ha)) - qla82xx_poll(0, rsp); - else - ha->isp_ops->intr_handler(0, rsp); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - } - - static inline uint8_t * -diff --git a/drivers/thermal/x86_pkg_temp_thermal.c b/drivers/thermal/x86_pkg_temp_thermal.c -index 7fc919f7da4d..e03fa17b8670 100644 ---- a/drivers/thermal/x86_pkg_temp_thermal.c -+++ b/drivers/thermal/x86_pkg_temp_thermal.c -@@ -29,6 +29,7 @@ - #include <linux/pm.h> - #include <linux/thermal.h> - #include <linux/debugfs.h> -+#include <linux/swork.h> - #include <asm/cpu_device_id.h> - #include <asm/mce.h> - -@@ -352,7 +353,7 @@ static void pkg_temp_thermal_threshold_work_fn(struct work_struct *work) - } - } - --static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val) -+static void platform_thermal_notify_work(struct swork_event *event) - { - unsigned long flags; - int cpu = smp_processor_id(); -@@ -369,7 +370,7 @@ static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val) - pkg_work_scheduled[phy_id]) { - disable_pkg_thres_interrupt(); - spin_unlock_irqrestore(&pkg_work_lock, flags); -- return -EINVAL; -+ return; - } - pkg_work_scheduled[phy_id] = 1; - spin_unlock_irqrestore(&pkg_work_lock, flags); -@@ -378,9 +379,48 @@ static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val) - schedule_delayed_work_on(cpu, - &per_cpu(pkg_temp_thermal_threshold_work, cpu), - msecs_to_jiffies(notify_delay_ms)); -+} -+ -+#ifdef CONFIG_PREEMPT_RT_FULL -+static struct swork_event notify_work; -+ -+static int thermal_notify_work_init(void) -+{ -+ int err; -+ -+ err = swork_get(); -+ if (err) -+ return err; -+ -+ INIT_SWORK(¬ify_work, platform_thermal_notify_work); - return 0; - } - -+static void thermal_notify_work_cleanup(void) -+{ -+ swork_put(); -+} -+ -+static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val) -+{ -+ swork_queue(¬ify_work); -+ return 0; -+} -+ -+#else /* !CONFIG_PREEMPT_RT_FULL */ -+ -+static int thermal_notify_work_init(void) { return 0; } -+ -+static void thermal_notify_work_cleanup(void) { } -+ -+static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val) -+{ -+ platform_thermal_notify_work(NULL); -+ -+ return 0; -+} -+#endif /* CONFIG_PREEMPT_RT_FULL */ -+ - static int find_siblings_cpu(int cpu) - { - int i; -@@ -584,6 +624,9 @@ static int __init pkg_temp_thermal_init(void) - if (!x86_match_cpu(pkg_temp_thermal_ids)) - return -ENODEV; - -+ if (!thermal_notify_work_init()) -+ return -ENODEV; -+ - spin_lock_init(&pkg_work_lock); - platform_thermal_package_notify = - pkg_temp_thermal_platform_thermal_notify; -@@ -608,7 +651,7 @@ static int __init pkg_temp_thermal_init(void) - kfree(pkg_work_scheduled); - platform_thermal_package_notify = NULL; - platform_thermal_package_rate_control = NULL; -- -+ thermal_notify_work_cleanup(); - return -ENODEV; - } - -@@ -633,6 +676,7 @@ static void __exit pkg_temp_thermal_exit(void) - mutex_unlock(&phy_dev_list_mutex); - platform_thermal_package_notify = NULL; - platform_thermal_package_rate_control = NULL; -+ thermal_notify_work_cleanup(); - for_each_online_cpu(i) - cancel_delayed_work_sync( - &per_cpu(pkg_temp_thermal_threshold_work, i)); -diff --git a/drivers/tty/metag_da.c b/drivers/tty/metag_da.c -index 9325262289f9..25ccef2fe748 100644 ---- a/drivers/tty/metag_da.c -+++ b/drivers/tty/metag_da.c -@@ -323,12 +323,12 @@ static void dashtty_timer(unsigned long ignored) - if (channel >= 0) - fetch_data(channel); - -- mod_timer_pinned(&poll_timer, jiffies + DA_TTY_POLL); -+ mod_timer(&poll_timer, jiffies + DA_TTY_POLL); - } - - static void add_poll_timer(struct timer_list *poll_timer) - { -- setup_timer(poll_timer, dashtty_timer, 0); -+ setup_pinned_timer(poll_timer, dashtty_timer, 0); - poll_timer->expires = jiffies + DA_TTY_POLL; - - /* -diff --git a/drivers/tty/mips_ejtag_fdc.c b/drivers/tty/mips_ejtag_fdc.c -index a119176a1855..234123b0c642 100644 ---- a/drivers/tty/mips_ejtag_fdc.c -+++ b/drivers/tty/mips_ejtag_fdc.c -@@ -689,7 +689,7 @@ static void mips_ejtag_fdc_tty_timer(unsigned long opaque) - - mips_ejtag_fdc_handle(priv); - if (!priv->removing) -- mod_timer_pinned(&priv->poll_timer, jiffies + FDC_TTY_POLL); -+ mod_timer(&priv->poll_timer, jiffies + FDC_TTY_POLL); - } - - /* TTY Port operations */ -@@ -1002,7 +1002,7 @@ static int mips_ejtag_fdc_tty_probe(struct mips_cdmm_device *dev) - raw_spin_unlock_irq(&priv->lock); - } else { - /* If we didn't get an usable IRQ, poll instead */ -- setup_timer(&priv->poll_timer, mips_ejtag_fdc_tty_timer, -+ setup_pinned_timer(&priv->poll_timer, mips_ejtag_fdc_tty_timer, - (unsigned long)priv); - priv->poll_timer.expires = jiffies + FDC_TTY_POLL; - /* -diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c -index 2f4f5ee651db..6ea6a3134e16 100644 ---- a/drivers/tty/serial/8250/8250_core.c -+++ b/drivers/tty/serial/8250/8250_core.c -@@ -58,7 +58,16 @@ static struct uart_driver serial8250_reg; - - static unsigned int skip_txen_test; /* force skip of txen test at init time */ - --#define PASS_LIMIT 512 -+/* -+ * On -rt we can have a more delays, and legitimately -+ * so - so don't drop work spuriously and spam the -+ * syslog: -+ */ -+#ifdef CONFIG_PREEMPT_RT_FULL -+# define PASS_LIMIT 1000000 -+#else -+# define PASS_LIMIT 512 -+#endif - - #include <asm/serial.h> - /* -diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c -index 00ad2637b08c..c9f6a4937b23 100644 ---- a/drivers/tty/serial/8250/8250_port.c -+++ b/drivers/tty/serial/8250/8250_port.c -@@ -35,6 +35,7 @@ - #include <linux/nmi.h> - #include <linux/mutex.h> - #include <linux/slab.h> -+#include <linux/kdb.h> - #include <linux/uaccess.h> - #include <linux/pm_runtime.h> - #include <linux/timer.h> -@@ -3092,9 +3093,9 @@ void serial8250_console_write(struct uart_8250_port *up, const char *s, - - serial8250_rpm_get(up); - -- if (port->sysrq) -+ if (port->sysrq || oops_in_progress) - locked = 0; -- else if (oops_in_progress) -+ else if (in_kdb_printk()) - locked = spin_trylock_irqsave(&port->lock, flags); - else - spin_lock_irqsave(&port->lock, flags); -diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c -index 7c198e0a3178..a26b81c4aae6 100644 ---- a/drivers/tty/serial/amba-pl011.c -+++ b/drivers/tty/serial/amba-pl011.c -@@ -2166,13 +2166,19 @@ pl011_console_write(struct console *co, const char *s, unsigned int count) - - clk_enable(uap->clk); - -- local_irq_save(flags); -+ /* -+ * local_irq_save(flags); -+ * -+ * This local_irq_save() is nonsense. If we come in via sysrq -+ * handling then interrupts are already disabled. Aside of -+ * that the port.sysrq check is racy on SMP regardless. -+ */ - if (uap->port.sysrq) - locked = 0; - else if (oops_in_progress) -- locked = spin_trylock(&uap->port.lock); -+ locked = spin_trylock_irqsave(&uap->port.lock, flags); - else -- spin_lock(&uap->port.lock); -+ spin_lock_irqsave(&uap->port.lock, flags); - - /* - * First save the CR then disable the interrupts -@@ -2196,8 +2202,7 @@ pl011_console_write(struct console *co, const char *s, unsigned int count) - pl011_write(old_cr, uap, REG_CR); - - if (locked) -- spin_unlock(&uap->port.lock); -- local_irq_restore(flags); -+ spin_unlock_irqrestore(&uap->port.lock, flags); - - clk_disable(uap->clk); - } -diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c -index a2a529994ba5..0ee7c4c518df 100644 ---- a/drivers/tty/serial/omap-serial.c -+++ b/drivers/tty/serial/omap-serial.c -@@ -1257,13 +1257,10 @@ serial_omap_console_write(struct console *co, const char *s, - - pm_runtime_get_sync(up->dev); - -- local_irq_save(flags); -- if (up->port.sysrq) -- locked = 0; -- else if (oops_in_progress) -- locked = spin_trylock(&up->port.lock); -+ if (up->port.sysrq || oops_in_progress) -+ locked = spin_trylock_irqsave(&up->port.lock, flags); - else -- spin_lock(&up->port.lock); -+ spin_lock_irqsave(&up->port.lock, flags); - - /* - * First save the IER then disable the interrupts -@@ -1292,8 +1289,7 @@ serial_omap_console_write(struct console *co, const char *s, - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); - if (locked) -- spin_unlock(&up->port.lock); -- local_irq_restore(flags); -+ spin_unlock_irqrestore(&up->port.lock, flags); - } - - static int __init -diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c -index 025a4264430e..73d46e2155a9 100644 ---- a/drivers/tty/serial/sc16is7xx.c -+++ b/drivers/tty/serial/sc16is7xx.c -@@ -1251,7 +1251,7 @@ static int sc16is7xx_probe(struct device *dev, - - /* Setup interrupt */ - ret = devm_request_irq(dev, irq, sc16is7xx_irq, -- IRQF_ONESHOT | flags, dev_name(dev), s); -+ flags, dev_name(dev), s); - if (!ret) - return 0; - -diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c -index 2d107d0f61b0..28a5cb87289a 100644 ---- a/drivers/usb/core/hcd.c -+++ b/drivers/usb/core/hcd.c -@@ -1759,9 +1759,9 @@ static void __usb_hcd_giveback_urb(struct urb *urb) - * and no one may trigger the above deadlock situation when - * running complete() in tasklet. - */ -- local_irq_save(flags); -+ local_irq_save_nort(flags); - urb->complete(urb); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - - usb_anchor_resume_wakeups(anchor); - atomic_dec(&urb->use_count); -diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c -index 73515d54e1cc..78a9351b6226 100644 ---- a/drivers/usb/gadget/function/f_fs.c -+++ b/drivers/usb/gadget/function/f_fs.c -@@ -1393,7 +1393,7 @@ static void ffs_data_put(struct ffs_data *ffs) - pr_info("%s(): freeing\n", __func__); - ffs_data_clear(ffs); - BUG_ON(waitqueue_active(&ffs->ev.waitq) || -- waitqueue_active(&ffs->ep0req_completion.wait)); -+ swait_active(&ffs->ep0req_completion.wait)); - kfree(ffs->dev_name); - kfree(ffs); - } -diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c -index aa3707bdebb4..665654412e4f 100644 ---- a/drivers/usb/gadget/legacy/inode.c -+++ b/drivers/usb/gadget/legacy/inode.c -@@ -346,7 +346,7 @@ ep_io (struct ep_data *epdata, void *buf, unsigned len) - spin_unlock_irq (&epdata->dev->lock); - - if (likely (value == 0)) { -- value = wait_event_interruptible (done.wait, done.done); -+ value = swait_event_interruptible (done.wait, done.done); - if (value != 0) { - spin_lock_irq (&epdata->dev->lock); - if (likely (epdata->ep != NULL)) { -@@ -355,7 +355,7 @@ ep_io (struct ep_data *epdata, void *buf, unsigned len) - usb_ep_dequeue (epdata->ep, epdata->req); - spin_unlock_irq (&epdata->dev->lock); - -- wait_event (done.wait, done.done); -+ swait_event (done.wait, done.done); - if (epdata->status == -ECONNRESET) - epdata->status = -EINTR; - } else { -diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c -index 04dcedfdebf8..86919ec47163 100644 ---- a/drivers/usb/host/ohci-hcd.c -+++ b/drivers/usb/host/ohci-hcd.c -@@ -500,7 +500,6 @@ static int ohci_init (struct ohci_hcd *ohci) - - setup_timer(&ohci->io_watchdog, io_watchdog_func, - (unsigned long) ohci); -- set_timer_slack(&ohci->io_watchdog, msecs_to_jiffies(20)); - - ohci->hcca = dma_alloc_coherent (hcd->self.controller, - sizeof(*ohci->hcca), &ohci->hcca_dma, GFP_KERNEL); -diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c -index 327280535848..7901a685b8de 100644 ---- a/drivers/usb/host/xhci.c -+++ b/drivers/usb/host/xhci.c -@@ -490,8 +490,6 @@ static void compliance_mode_recovery_timer_init(struct xhci_hcd *xhci) - xhci->comp_mode_recovery_timer.expires = jiffies + - msecs_to_jiffies(COMP_MODE_RCVRY_MSECS); - -- set_timer_slack(&xhci->comp_mode_recovery_timer, -- msecs_to_jiffies(COMP_MODE_RCVRY_MSECS)); - add_timer(&xhci->comp_mode_recovery_timer); - xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, - "Compliance mode recovery timer initialized"); -diff --git a/fs/aio.c b/fs/aio.c -index 155f84253f33..dd8d6f234a0b 100644 ---- a/fs/aio.c -+++ b/fs/aio.c -@@ -40,6 +40,7 @@ - #include <linux/ramfs.h> - #include <linux/percpu-refcount.h> - #include <linux/mount.h> -+#include <linux/swork.h> - - #include <asm/kmap_types.h> - #include <asm/uaccess.h> -@@ -115,7 +116,7 @@ struct kioctx { - struct page **ring_pages; - long nr_pages; - -- struct work_struct free_work; -+ struct swork_event free_work; - - /* - * signals when all in-flight requests are done -@@ -253,6 +254,7 @@ static int __init aio_setup(void) - .mount = aio_mount, - .kill_sb = kill_anon_super, - }; -+ BUG_ON(swork_get()); - aio_mnt = kern_mount(&aio_fs); - if (IS_ERR(aio_mnt)) - panic("Failed to create aio fs mount."); -@@ -568,9 +570,9 @@ static int kiocb_cancel(struct aio_kiocb *kiocb) - return cancel(&kiocb->common); - } - --static void free_ioctx(struct work_struct *work) -+static void free_ioctx(struct swork_event *sev) - { -- struct kioctx *ctx = container_of(work, struct kioctx, free_work); -+ struct kioctx *ctx = container_of(sev, struct kioctx, free_work); - - pr_debug("freeing %p\n", ctx); - -@@ -589,8 +591,8 @@ static void free_ioctx_reqs(struct percpu_ref *ref) - if (ctx->rq_wait && atomic_dec_and_test(&ctx->rq_wait->count)) - complete(&ctx->rq_wait->comp); - -- INIT_WORK(&ctx->free_work, free_ioctx); -- schedule_work(&ctx->free_work); -+ INIT_SWORK(&ctx->free_work, free_ioctx); -+ swork_queue(&ctx->free_work); - } - - /* -@@ -598,9 +600,9 @@ static void free_ioctx_reqs(struct percpu_ref *ref) - * and ctx->users has dropped to 0, so we know no more kiocbs can be submitted - - * now it's safe to cancel any that need to be. - */ --static void free_ioctx_users(struct percpu_ref *ref) -+static void free_ioctx_users_work(struct swork_event *sev) - { -- struct kioctx *ctx = container_of(ref, struct kioctx, users); -+ struct kioctx *ctx = container_of(sev, struct kioctx, free_work); - struct aio_kiocb *req; - - spin_lock_irq(&ctx->ctx_lock); -@@ -619,6 +621,14 @@ static void free_ioctx_users(struct percpu_ref *ref) - percpu_ref_put(&ctx->reqs); - } - -+static void free_ioctx_users(struct percpu_ref *ref) -+{ -+ struct kioctx *ctx = container_of(ref, struct kioctx, users); -+ -+ INIT_SWORK(&ctx->free_work, free_ioctx_users_work); -+ swork_queue(&ctx->free_work); -+} -+ - static int ioctx_add_table(struct kioctx *ctx, struct mm_struct *mm) - { - unsigned i, new_nr; -diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h -index f0d268b97d19..dfbccaefae5d 100644 ---- a/fs/autofs4/autofs_i.h -+++ b/fs/autofs4/autofs_i.h -@@ -30,6 +30,7 @@ - #include <linux/sched.h> - #include <linux/mount.h> - #include <linux/namei.h> -+#include <linux/delay.h> - #include <asm/current.h> - #include <linux/uaccess.h> - -diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c -index 9510d8d2e9cd..893c87d4f5a9 100644 ---- a/fs/autofs4/expire.c -+++ b/fs/autofs4/expire.c -@@ -148,7 +148,7 @@ static struct dentry *get_next_positive_dentry(struct dentry *prev, - parent = p->d_parent; - if (!spin_trylock(&parent->d_lock)) { - spin_unlock(&p->d_lock); -- cpu_relax(); -+ cpu_chill(); - goto relock; - } - spin_unlock(&p->d_lock); -diff --git a/fs/buffer.c b/fs/buffer.c -index af0d9a82a8ed..370df12f9df7 100644 ---- a/fs/buffer.c -+++ b/fs/buffer.c -@@ -300,8 +300,7 @@ static void end_buffer_async_read(struct buffer_head *bh, int uptodate) - * decide that the page is now completely done. - */ - first = page_buffers(page); -- local_irq_save(flags); -- bit_spin_lock(BH_Uptodate_Lock, &first->b_state); -+ flags = bh_uptodate_lock_irqsave(first); - clear_buffer_async_read(bh); - unlock_buffer(bh); - tmp = bh; -@@ -314,8 +313,7 @@ static void end_buffer_async_read(struct buffer_head *bh, int uptodate) - } - tmp = tmp->b_this_page; - } while (tmp != bh); -- bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); -- local_irq_restore(flags); -+ bh_uptodate_unlock_irqrestore(first, flags); - - /* - * If none of the buffers had errors and they are all -@@ -327,9 +325,7 @@ static void end_buffer_async_read(struct buffer_head *bh, int uptodate) - return; - - still_busy: -- bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); -- local_irq_restore(flags); -- return; -+ bh_uptodate_unlock_irqrestore(first, flags); - } - - /* -@@ -357,8 +353,7 @@ void end_buffer_async_write(struct buffer_head *bh, int uptodate) - } - - first = page_buffers(page); -- local_irq_save(flags); -- bit_spin_lock(BH_Uptodate_Lock, &first->b_state); -+ flags = bh_uptodate_lock_irqsave(first); - - clear_buffer_async_write(bh); - unlock_buffer(bh); -@@ -370,15 +365,12 @@ void end_buffer_async_write(struct buffer_head *bh, int uptodate) - } - tmp = tmp->b_this_page; - } -- bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); -- local_irq_restore(flags); -+ bh_uptodate_unlock_irqrestore(first, flags); - end_page_writeback(page); - return; - - still_busy: -- bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); -- local_irq_restore(flags); -- return; -+ bh_uptodate_unlock_irqrestore(first, flags); - } - EXPORT_SYMBOL(end_buffer_async_write); - -@@ -3314,6 +3306,7 @@ struct buffer_head *alloc_buffer_head(gfp_t gfp_flags) - struct buffer_head *ret = kmem_cache_zalloc(bh_cachep, gfp_flags); - if (ret) { - INIT_LIST_HEAD(&ret->b_assoc_buffers); -+ buffer_head_init_locks(ret); - preempt_disable(); - __this_cpu_inc(bh_accounting.nr); - recalc_bh_state(); -diff --git a/fs/dcache.c b/fs/dcache.c -index 44008e3fafc4..abc87dc3b8bf 100644 ---- a/fs/dcache.c -+++ b/fs/dcache.c -@@ -19,6 +19,7 @@ - #include <linux/mm.h> - #include <linux/fs.h> - #include <linux/fsnotify.h> -+#include <linux/delay.h> - #include <linux/slab.h> - #include <linux/init.h> - #include <linux/hash.h> -@@ -578,7 +579,7 @@ static struct dentry *dentry_kill(struct dentry *dentry) - - failed: - spin_unlock(&dentry->d_lock); -- cpu_relax(); -+ cpu_chill(); - return dentry; /* try again with same dentry */ - } - -@@ -2316,7 +2317,7 @@ void d_delete(struct dentry * dentry) - if (dentry->d_lockref.count == 1) { - if (!spin_trylock(&inode->i_lock)) { - spin_unlock(&dentry->d_lock); -- cpu_relax(); -+ cpu_chill(); - goto again; - } - dentry->d_flags &= ~DCACHE_CANT_MOUNT; -diff --git a/fs/eventpoll.c b/fs/eventpoll.c -index 8a74a2a52e0f..b92f9110a641 100644 ---- a/fs/eventpoll.c -+++ b/fs/eventpoll.c -@@ -510,12 +510,12 @@ static int ep_poll_wakeup_proc(void *priv, void *cookie, int call_nests) - */ - static void ep_poll_safewake(wait_queue_head_t *wq) - { -- int this_cpu = get_cpu(); -+ int this_cpu = get_cpu_light(); - - ep_call_nested(&poll_safewake_ncalls, EP_MAX_NESTS, - ep_poll_wakeup_proc, NULL, wq, (void *) (long) this_cpu); - -- put_cpu(); -+ put_cpu_light(); - } - - static void ep_remove_wait_queue(struct eppoll_entry *pwq) -diff --git a/fs/exec.c b/fs/exec.c -index c4010b8207a1..879fd0772b78 100644 ---- a/fs/exec.c -+++ b/fs/exec.c -@@ -961,12 +961,14 @@ static int exec_mmap(struct mm_struct *mm) - } - } - task_lock(tsk); -+ preempt_disable_rt(); - active_mm = tsk->active_mm; - tsk->mm = mm; - tsk->active_mm = mm; - activate_mm(active_mm, mm); - tsk->mm->vmacache_seqnum = 0; - vmacache_flush(tsk); -+ preempt_enable_rt(); - task_unlock(tsk); - if (old_mm) { - up_read(&old_mm->mmap_sem); -diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c -index 684996c8a3a4..6e18a06aaabe 100644 ---- a/fs/jbd2/checkpoint.c -+++ b/fs/jbd2/checkpoint.c -@@ -116,6 +116,8 @@ void __jbd2_log_wait_for_space(journal_t *journal) - nblocks = jbd2_space_needed(journal); - while (jbd2_log_space_left(journal) < nblocks) { - write_unlock(&journal->j_state_lock); -+ if (current->plug) -+ io_schedule(); - mutex_lock(&journal->j_checkpoint_mutex); - - /* -diff --git a/fs/namespace.c b/fs/namespace.c -index 783004af5707..ff8492bd3de7 100644 ---- a/fs/namespace.c -+++ b/fs/namespace.c -@@ -14,6 +14,7 @@ - #include <linux/mnt_namespace.h> - #include <linux/user_namespace.h> - #include <linux/namei.h> -+#include <linux/delay.h> - #include <linux/security.h> - #include <linux/idr.h> - #include <linux/init.h> /* init_rootfs */ -@@ -353,8 +354,11 @@ int __mnt_want_write(struct vfsmount *m) - * incremented count after it has set MNT_WRITE_HOLD. - */ - smp_mb(); -- while (ACCESS_ONCE(mnt->mnt.mnt_flags) & MNT_WRITE_HOLD) -- cpu_relax(); -+ while (ACCESS_ONCE(mnt->mnt.mnt_flags) & MNT_WRITE_HOLD) { -+ preempt_enable(); -+ cpu_chill(); -+ preempt_disable(); -+ } - /* - * After the slowpath clears MNT_WRITE_HOLD, mnt_is_readonly will - * be set to match its requirements. So we must not load that until -diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c -index 97768a1379f2..6d2ea1af146b 100644 ---- a/fs/ntfs/aops.c -+++ b/fs/ntfs/aops.c -@@ -92,13 +92,13 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate) - ofs = 0; - if (file_ofs < init_size) - ofs = init_size - file_ofs; -- local_irq_save(flags); -+ local_irq_save_nort(flags); - kaddr = kmap_atomic(page); - memset(kaddr + bh_offset(bh) + ofs, 0, - bh->b_size - ofs); - flush_dcache_page(page); - kunmap_atomic(kaddr); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - } - } else { - clear_buffer_uptodate(bh); -@@ -107,8 +107,7 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate) - "0x%llx.", (unsigned long long)bh->b_blocknr); - } - first = page_buffers(page); -- local_irq_save(flags); -- bit_spin_lock(BH_Uptodate_Lock, &first->b_state); -+ flags = bh_uptodate_lock_irqsave(first); - clear_buffer_async_read(bh); - unlock_buffer(bh); - tmp = bh; -@@ -123,8 +122,7 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate) - } - tmp = tmp->b_this_page; - } while (tmp != bh); -- bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); -- local_irq_restore(flags); -+ bh_uptodate_unlock_irqrestore(first, flags); - /* - * If none of the buffers had errors then we can set the page uptodate, - * but we first have to perform the post read mst fixups, if the -@@ -145,13 +143,13 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate) - recs = PAGE_SIZE / rec_size; - /* Should have been verified before we got here... */ - BUG_ON(!recs); -- local_irq_save(flags); -+ local_irq_save_nort(flags); - kaddr = kmap_atomic(page); - for (i = 0; i < recs; i++) - post_read_mst_fixup((NTFS_RECORD*)(kaddr + - i * rec_size), rec_size); - kunmap_atomic(kaddr); -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - flush_dcache_page(page); - if (likely(page_uptodate && !PageError(page))) - SetPageUptodate(page); -@@ -159,9 +157,7 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate) - unlock_page(page); - return; - still_busy: -- bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); -- local_irq_restore(flags); -- return; -+ bh_uptodate_unlock_irqrestore(first, flags); - } - - /** -diff --git a/fs/timerfd.c b/fs/timerfd.c -index 053818dd6c18..c4bc14fe0085 100644 ---- a/fs/timerfd.c -+++ b/fs/timerfd.c -@@ -450,7 +450,10 @@ static int do_timerfd_settime(int ufd, int flags, - break; - } - spin_unlock_irq(&ctx->wqh.lock); -- cpu_relax(); -+ if (isalarm(ctx)) -+ hrtimer_wait_for_timer(&ctx->t.alarm.timer); -+ else -+ hrtimer_wait_for_timer(&ctx->t.tmr); - } - - /* -diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h -index 45c2d6528829..794eead4f075 100644 ---- a/include/acpi/platform/aclinux.h -+++ b/include/acpi/platform/aclinux.h -@@ -127,6 +127,7 @@ - - #define acpi_cache_t struct kmem_cache - #define acpi_spinlock spinlock_t * -+#define acpi_raw_spinlock raw_spinlock_t * - #define acpi_cpu_flags unsigned long - - /* Use native linux version of acpi_os_allocate_zeroed */ -@@ -145,6 +146,20 @@ - #define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_thread_id - #define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_create_lock - -+#define acpi_os_create_raw_lock(__handle) \ -+({ \ -+ raw_spinlock_t *lock = ACPI_ALLOCATE(sizeof(*lock)); \ -+ \ -+ if (lock) { \ -+ *(__handle) = lock; \ -+ raw_spin_lock_init(*(__handle)); \ -+ } \ -+ lock ? AE_OK : AE_NO_MEMORY; \ -+ }) -+ -+#define acpi_os_delete_raw_lock(__handle) kfree(__handle) -+ -+ - /* - * OSL interfaces used by debugger/disassembler - */ -diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h -index 6f96247226a4..fa53a21263c2 100644 ---- a/include/asm-generic/bug.h -+++ b/include/asm-generic/bug.h -@@ -215,6 +215,20 @@ void __warn(const char *file, int line, void *caller, unsigned taint, - # define WARN_ON_SMP(x) ({0;}) - #endif - -+#ifdef CONFIG_PREEMPT_RT_BASE -+# define BUG_ON_RT(c) BUG_ON(c) -+# define BUG_ON_NONRT(c) do { } while (0) -+# define WARN_ON_RT(condition) WARN_ON(condition) -+# define WARN_ON_NONRT(condition) do { } while (0) -+# define WARN_ON_ONCE_NONRT(condition) do { } while (0) -+#else -+# define BUG_ON_RT(c) do { } while (0) -+# define BUG_ON_NONRT(c) BUG_ON(c) -+# define WARN_ON_RT(condition) do { } while (0) -+# define WARN_ON_NONRT(condition) WARN_ON(condition) -+# define WARN_ON_ONCE_NONRT(condition) WARN_ON_ONCE(condition) -+#endif -+ - #endif /* __ASSEMBLY__ */ - - #endif -diff --git a/include/asm-generic/preempt.h b/include/asm-generic/preempt.h -index 5d8ffa3e6f8c..c1cde3577551 100644 ---- a/include/asm-generic/preempt.h -+++ b/include/asm-generic/preempt.h -@@ -7,10 +7,10 @@ - - static __always_inline int preempt_count(void) - { -- return current_thread_info()->preempt_count; -+ return READ_ONCE(current_thread_info()->preempt_count); - } - --static __always_inline int *preempt_count_ptr(void) -+static __always_inline volatile int *preempt_count_ptr(void) - { - return ¤t_thread_info()->preempt_count; - } -diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h -index 9ac9799b702b..05fc2492131a 100644 ---- a/include/linux/blk-mq.h -+++ b/include/linux/blk-mq.h -@@ -218,6 +218,7 @@ static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag) - - struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index); - struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int, int); -+void __blk_mq_complete_request_remote_work(struct work_struct *work); - - int blk_mq_request_started(struct request *rq); - void blk_mq_start_request(struct request *rq); -diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h -index 669e419d6234..6678028d8508 100644 ---- a/include/linux/blkdev.h -+++ b/include/linux/blkdev.h -@@ -90,6 +90,7 @@ struct request { - struct list_head queuelist; - union { - struct call_single_data csd; -+ struct work_struct work; - unsigned long fifo_time; - }; - -@@ -457,7 +458,7 @@ struct request_queue { - struct throtl_data *td; - #endif - struct rcu_head rcu_head; -- wait_queue_head_t mq_freeze_wq; -+ struct swait_queue_head mq_freeze_wq; - struct percpu_ref q_usage_counter; - struct list_head all_q_node; - -diff --git a/include/linux/bottom_half.h b/include/linux/bottom_half.h -index 8fdcb783197d..d07dbeec7bc1 100644 ---- a/include/linux/bottom_half.h -+++ b/include/linux/bottom_half.h -@@ -3,6 +3,39 @@ - - #include <linux/preempt.h> - -+#ifdef CONFIG_PREEMPT_RT_FULL -+ -+extern void __local_bh_disable(void); -+extern void _local_bh_enable(void); -+extern void __local_bh_enable(void); -+ -+static inline void local_bh_disable(void) -+{ -+ __local_bh_disable(); -+} -+ -+static inline void __local_bh_disable_ip(unsigned long ip, unsigned int cnt) -+{ -+ __local_bh_disable(); -+} -+ -+static inline void local_bh_enable(void) -+{ -+ __local_bh_enable(); -+} -+ -+static inline void __local_bh_enable_ip(unsigned long ip, unsigned int cnt) -+{ -+ __local_bh_enable(); -+} -+ -+static inline void local_bh_enable_ip(unsigned long ip) -+{ -+ __local_bh_enable(); -+} -+ -+#else -+ - #ifdef CONFIG_TRACE_IRQFLAGS - extern void __local_bh_disable_ip(unsigned long ip, unsigned int cnt); - #else -@@ -30,5 +63,6 @@ static inline void local_bh_enable(void) - { - __local_bh_enable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET); - } -+#endif - - #endif /* _LINUX_BH_H */ -diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h -index d48daa3f6f20..91588cd809ce 100644 ---- a/include/linux/buffer_head.h -+++ b/include/linux/buffer_head.h -@@ -75,8 +75,50 @@ struct buffer_head { - struct address_space *b_assoc_map; /* mapping this buffer is - associated with */ - atomic_t b_count; /* users using this buffer_head */ -+#ifdef CONFIG_PREEMPT_RT_BASE -+ spinlock_t b_uptodate_lock; -+#if IS_ENABLED(CONFIG_JBD2) -+ spinlock_t b_state_lock; -+ spinlock_t b_journal_head_lock; -+#endif -+#endif - }; - -+static inline unsigned long bh_uptodate_lock_irqsave(struct buffer_head *bh) -+{ -+ unsigned long flags; -+ -+#ifndef CONFIG_PREEMPT_RT_BASE -+ local_irq_save(flags); -+ bit_spin_lock(BH_Uptodate_Lock, &bh->b_state); -+#else -+ spin_lock_irqsave(&bh->b_uptodate_lock, flags); -+#endif -+ return flags; -+} -+ -+static inline void -+bh_uptodate_unlock_irqrestore(struct buffer_head *bh, unsigned long flags) -+{ -+#ifndef CONFIG_PREEMPT_RT_BASE -+ bit_spin_unlock(BH_Uptodate_Lock, &bh->b_state); -+ local_irq_restore(flags); -+#else -+ spin_unlock_irqrestore(&bh->b_uptodate_lock, flags); -+#endif -+} -+ -+static inline void buffer_head_init_locks(struct buffer_head *bh) -+{ -+#ifdef CONFIG_PREEMPT_RT_BASE -+ spin_lock_init(&bh->b_uptodate_lock); -+#if IS_ENABLED(CONFIG_JBD2) -+ spin_lock_init(&bh->b_state_lock); -+ spin_lock_init(&bh->b_journal_head_lock); -+#endif -+#endif -+} -+ - /* - * macro tricks to expand the set_buffer_foo(), clear_buffer_foo() - * and buffer_foo() functions. -diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h -index 5b17de62c962..56027cc01a56 100644 ---- a/include/linux/cgroup-defs.h -+++ b/include/linux/cgroup-defs.h -@@ -16,6 +16,7 @@ - #include <linux/percpu-refcount.h> - #include <linux/percpu-rwsem.h> - #include <linux/workqueue.h> -+#include <linux/swork.h> - - #ifdef CONFIG_CGROUPS - -@@ -137,6 +138,7 @@ struct cgroup_subsys_state { - /* percpu_ref killing and RCU release */ - struct rcu_head rcu_head; - struct work_struct destroy_work; -+ struct swork_event destroy_swork; - }; - - /* -diff --git a/include/linux/completion.h b/include/linux/completion.h -index 5d5aaae3af43..3bca1590e29f 100644 ---- a/include/linux/completion.h -+++ b/include/linux/completion.h -@@ -7,8 +7,7 @@ - * Atomic wait-for-completion handler data structures. - * See kernel/sched/completion.c for details. - */ -- --#include <linux/wait.h> -+#include <linux/swait.h> - - /* - * struct completion - structure used to maintain state for a "completion" -@@ -24,11 +23,11 @@ - */ - struct completion { - unsigned int done; -- wait_queue_head_t wait; -+ struct swait_queue_head wait; - }; - - #define COMPLETION_INITIALIZER(work) \ -- { 0, __WAIT_QUEUE_HEAD_INITIALIZER((work).wait) } -+ { 0, __SWAIT_QUEUE_HEAD_INITIALIZER((work).wait) } - - #define COMPLETION_INITIALIZER_ONSTACK(work) \ - ({ init_completion(&work); work; }) -@@ -73,7 +72,7 @@ struct completion { - static inline void init_completion(struct completion *x) - { - x->done = 0; -- init_waitqueue_head(&x->wait); -+ init_swait_queue_head(&x->wait); - } - - /** -diff --git a/include/linux/cpu.h b/include/linux/cpu.h -index f9b1fab4388a..d4cc4818d13e 100644 ---- a/include/linux/cpu.h -+++ b/include/linux/cpu.h -@@ -230,6 +230,8 @@ extern void get_online_cpus(void); - extern void put_online_cpus(void); - extern void cpu_hotplug_disable(void); - extern void cpu_hotplug_enable(void); -+extern void pin_current_cpu(void); -+extern void unpin_current_cpu(void); - #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri) - #define __hotcpu_notifier(fn, pri) __cpu_notifier(fn, pri) - #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) -@@ -247,6 +249,8 @@ static inline void cpu_hotplug_done(void) {} - #define put_online_cpus() do { } while (0) - #define cpu_hotplug_disable() do { } while (0) - #define cpu_hotplug_enable() do { } while (0) -+static inline void pin_current_cpu(void) { } -+static inline void unpin_current_cpu(void) { } - #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) - #define __hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) - /* These aren't inline functions due to a GCC bug. */ -diff --git a/include/linux/delay.h b/include/linux/delay.h -index a6ecb34cf547..37caab306336 100644 ---- a/include/linux/delay.h -+++ b/include/linux/delay.h -@@ -52,4 +52,10 @@ static inline void ssleep(unsigned int seconds) - msleep(seconds * 1000); - } - -+#ifdef CONFIG_PREEMPT_RT_FULL -+extern void cpu_chill(void); -+#else -+# define cpu_chill() cpu_relax() -+#endif -+ - #endif /* defined(_LINUX_DELAY_H) */ -diff --git a/include/linux/highmem.h b/include/linux/highmem.h -index bb3f3297062a..a117a33ef72c 100644 ---- a/include/linux/highmem.h -+++ b/include/linux/highmem.h -@@ -7,6 +7,7 @@ - #include <linux/mm.h> - #include <linux/uaccess.h> - #include <linux/hardirq.h> -+#include <linux/sched.h> - - #include <asm/cacheflush.h> - -@@ -65,7 +66,7 @@ static inline void kunmap(struct page *page) - - static inline void *kmap_atomic(struct page *page) - { -- preempt_disable(); -+ preempt_disable_nort(); - pagefault_disable(); - return page_address(page); - } -@@ -74,7 +75,7 @@ static inline void *kmap_atomic(struct page *page) - static inline void __kunmap_atomic(void *addr) - { - pagefault_enable(); -- preempt_enable(); -+ preempt_enable_nort(); - } - - #define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn)) -@@ -86,32 +87,51 @@ static inline void __kunmap_atomic(void *addr) - - #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32) - -+#ifndef CONFIG_PREEMPT_RT_FULL - DECLARE_PER_CPU(int, __kmap_atomic_idx); -+#endif - - static inline int kmap_atomic_idx_push(void) - { -+#ifndef CONFIG_PREEMPT_RT_FULL - int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1; - --#ifdef CONFIG_DEBUG_HIGHMEM -+# ifdef CONFIG_DEBUG_HIGHMEM - WARN_ON_ONCE(in_irq() && !irqs_disabled()); - BUG_ON(idx >= KM_TYPE_NR); --#endif -+# endif - return idx; -+#else -+ current->kmap_idx++; -+ BUG_ON(current->kmap_idx > KM_TYPE_NR); -+ return current->kmap_idx - 1; -+#endif - } - - static inline int kmap_atomic_idx(void) - { -+#ifndef CONFIG_PREEMPT_RT_FULL - return __this_cpu_read(__kmap_atomic_idx) - 1; -+#else -+ return current->kmap_idx - 1; -+#endif - } - - static inline void kmap_atomic_idx_pop(void) - { --#ifdef CONFIG_DEBUG_HIGHMEM -+#ifndef CONFIG_PREEMPT_RT_FULL -+# ifdef CONFIG_DEBUG_HIGHMEM - int idx = __this_cpu_dec_return(__kmap_atomic_idx); - - BUG_ON(idx < 0); --#else -+# else - __this_cpu_dec(__kmap_atomic_idx); -+# endif -+#else -+ current->kmap_idx--; -+# ifdef CONFIG_DEBUG_HIGHMEM -+ BUG_ON(current->kmap_idx < 0); -+# endif - #endif - } - -diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h -index c98c6539e2c2..573ffbce6ab7 100644 ---- a/include/linux/hrtimer.h -+++ b/include/linux/hrtimer.h -@@ -87,6 +87,9 @@ enum hrtimer_restart { - * @function: timer expiry callback function - * @base: pointer to the timer base (per cpu and per clock) - * @state: state information (See bit values above) -+ * @cb_entry: list entry to defer timers from hardirq context -+ * @irqsafe: timer can run in hardirq context -+ * @praecox: timer expiry time if expired at the time of programming - * @is_rel: Set if the timer was armed relative - * @start_pid: timer statistics field to store the pid of the task which - * started the timer -@@ -103,6 +106,11 @@ struct hrtimer { - enum hrtimer_restart (*function)(struct hrtimer *); - struct hrtimer_clock_base *base; - u8 state; -+ struct list_head cb_entry; -+ int irqsafe; -+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST -+ ktime_t praecox; -+#endif - u8 is_rel; - #ifdef CONFIG_TIMER_STATS - int start_pid; -@@ -123,11 +131,7 @@ struct hrtimer_sleeper { - struct task_struct *task; - }; - --#ifdef CONFIG_64BIT - # define HRTIMER_CLOCK_BASE_ALIGN 64 --#else --# define HRTIMER_CLOCK_BASE_ALIGN 32 --#endif - - /** - * struct hrtimer_clock_base - the timer base for a specific clock -@@ -136,6 +140,7 @@ struct hrtimer_sleeper { - * timer to a base on another cpu. - * @clockid: clock id for per_cpu support - * @active: red black tree root node for the active timers -+ * @expired: list head for deferred timers. - * @get_time: function to retrieve the current time of the clock - * @offset: offset of this clock to the monotonic base - */ -@@ -144,6 +149,7 @@ struct hrtimer_clock_base { - int index; - clockid_t clockid; - struct timerqueue_head active; -+ struct list_head expired; - ktime_t (*get_time)(void); - ktime_t offset; - } __attribute__((__aligned__(HRTIMER_CLOCK_BASE_ALIGN))); -@@ -187,6 +193,7 @@ struct hrtimer_cpu_base { - raw_spinlock_t lock; - seqcount_t seq; - struct hrtimer *running; -+ struct hrtimer *running_soft; - unsigned int cpu; - unsigned int active_bases; - unsigned int clock_was_set_seq; -@@ -203,6 +210,9 @@ struct hrtimer_cpu_base { - unsigned int nr_hangs; - unsigned int max_hang_time; - #endif -+#ifdef CONFIG_PREEMPT_RT_BASE -+ wait_queue_head_t wait; -+#endif - struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES]; - } ____cacheline_aligned; - -@@ -412,6 +422,13 @@ static inline void hrtimer_restart(struct hrtimer *timer) - hrtimer_start_expires(timer, HRTIMER_MODE_ABS); - } - -+/* Softirq preemption could deadlock timer removal */ -+#ifdef CONFIG_PREEMPT_RT_BASE -+ extern void hrtimer_wait_for_timer(const struct hrtimer *timer); -+#else -+# define hrtimer_wait_for_timer(timer) do { cpu_relax(); } while (0) -+#endif -+ - /* Query timers: */ - extern ktime_t __hrtimer_get_remaining(const struct hrtimer *timer, bool adjust); - -@@ -436,7 +453,7 @@ static inline int hrtimer_is_queued(struct hrtimer *timer) - * Helper function to check, whether the timer is running the callback - * function - */ --static inline int hrtimer_callback_running(struct hrtimer *timer) -+static inline int hrtimer_callback_running(const struct hrtimer *timer) - { - return timer->base->cpu_base->running == timer; - } -diff --git a/include/linux/idr.h b/include/linux/idr.h -index 083d61e92706..5899796f50cb 100644 ---- a/include/linux/idr.h -+++ b/include/linux/idr.h -@@ -95,10 +95,14 @@ bool idr_is_empty(struct idr *idp); - * Each idr_preload() should be matched with an invocation of this - * function. See idr_preload() for details. - */ -+#ifdef CONFIG_PREEMPT_RT_FULL -+void idr_preload_end(void); -+#else - static inline void idr_preload_end(void) - { - preempt_enable(); - } -+#endif - - /** - * idr_find - return pointer for given id -diff --git a/include/linux/init_task.h b/include/linux/init_task.h -index f2cb8d45513d..60fadde71a44 100644 ---- a/include/linux/init_task.h -+++ b/include/linux/init_task.h -@@ -148,6 +148,12 @@ extern struct task_group root_task_group; - # define INIT_PERF_EVENTS(tsk) - #endif - -+#ifdef CONFIG_PREEMPT_RT_BASE -+# define INIT_TIMER_LIST .posix_timer_list = NULL, -+#else -+# define INIT_TIMER_LIST -+#endif -+ - #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN - # define INIT_VTIME(tsk) \ - .vtime_seqcount = SEQCNT_ZERO(tsk.vtime_seqcount), \ -@@ -239,6 +245,7 @@ extern struct task_group root_task_group; - .cpu_timers = INIT_CPU_TIMERS(tsk.cpu_timers), \ - .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock), \ - .timer_slack_ns = 50000, /* 50 usec default slack */ \ -+ INIT_TIMER_LIST \ - .pids = { \ - [PIDTYPE_PID] = INIT_PID_LINK(PIDTYPE_PID), \ - [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID), \ -diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h -index 9fcabeb07787..e6f7e42c8253 100644 ---- a/include/linux/interrupt.h -+++ b/include/linux/interrupt.h -@@ -61,6 +61,7 @@ - * interrupt handler after suspending interrupts. For system - * wakeup devices users need to implement wakeup detection in - * their interrupt handlers. -+ * IRQF_NO_SOFTIRQ_CALL - Do not process softirqs in the irq thread context (RT) - */ - #define IRQF_SHARED 0x00000080 - #define IRQF_PROBE_SHARED 0x00000100 -@@ -74,6 +75,7 @@ - #define IRQF_NO_THREAD 0x00010000 - #define IRQF_EARLY_RESUME 0x00020000 - #define IRQF_COND_SUSPEND 0x00040000 -+#define IRQF_NO_SOFTIRQ_CALL 0x00080000 - - #define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD) - -@@ -196,7 +198,7 @@ extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id); - #ifdef CONFIG_LOCKDEP - # define local_irq_enable_in_hardirq() do { } while (0) - #else --# define local_irq_enable_in_hardirq() local_irq_enable() -+# define local_irq_enable_in_hardirq() local_irq_enable_nort() - #endif - - extern void disable_irq_nosync(unsigned int irq); -@@ -217,6 +219,7 @@ extern void resume_device_irqs(void); - * @irq: Interrupt to which notification applies - * @kref: Reference count, for internal use - * @work: Work item, for internal use -+ * @list: List item for deferred callbacks - * @notify: Function to be called on change. This will be - * called in process context. - * @release: Function to be called on release. This will be -@@ -228,6 +231,7 @@ struct irq_affinity_notify { - unsigned int irq; - struct kref kref; - struct work_struct work; -+ struct list_head list; - void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask); - void (*release)(struct kref *ref); - }; -@@ -390,9 +394,13 @@ extern int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which, - bool state); - - #ifdef CONFIG_IRQ_FORCED_THREADING -+# ifndef CONFIG_PREEMPT_RT_BASE - extern bool force_irqthreads; -+# else -+# define force_irqthreads (true) -+# endif - #else --#define force_irqthreads (0) -+#define force_irqthreads (false) - #endif - - #ifndef __ARCH_SET_SOFTIRQ_PENDING -@@ -449,9 +457,10 @@ struct softirq_action - void (*action)(struct softirq_action *); - }; - -+#ifndef CONFIG_PREEMPT_RT_FULL - asmlinkage void do_softirq(void); - asmlinkage void __do_softirq(void); -- -+static inline void thread_do_softirq(void) { do_softirq(); } - #ifdef __ARCH_HAS_DO_SOFTIRQ - void do_softirq_own_stack(void); - #else -@@ -460,13 +469,25 @@ static inline void do_softirq_own_stack(void) - __do_softirq(); - } - #endif -+#else -+extern void thread_do_softirq(void); -+#endif - - extern void open_softirq(int nr, void (*action)(struct softirq_action *)); - extern void softirq_init(void); - extern void __raise_softirq_irqoff(unsigned int nr); -+#ifdef CONFIG_PREEMPT_RT_FULL -+extern void __raise_softirq_irqoff_ksoft(unsigned int nr); -+#else -+static inline void __raise_softirq_irqoff_ksoft(unsigned int nr) -+{ -+ __raise_softirq_irqoff(nr); -+} -+#endif - - extern void raise_softirq_irqoff(unsigned int nr); - extern void raise_softirq(unsigned int nr); -+extern void softirq_check_pending_idle(void); - - DECLARE_PER_CPU(struct task_struct *, ksoftirqd); - -@@ -488,8 +509,9 @@ static inline struct task_struct *this_cpu_ksoftirqd(void) - to be executed on some cpu at least once after this. - * If the tasklet is already scheduled, but its execution is still not - started, it will be executed only once. -- * If this tasklet is already running on another CPU (or schedule is called -- from tasklet itself), it is rescheduled for later. -+ * If this tasklet is already running on another CPU, it is rescheduled -+ for later. -+ * Schedule must not be called from the tasklet itself (a lockup occurs) - * Tasklet is strictly serialized wrt itself, but not - wrt another tasklets. If client needs some intertask synchronization, - he makes it with spinlocks. -@@ -514,27 +536,36 @@ struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data } - enum - { - TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ -- TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ -+ TASKLET_STATE_RUN, /* Tasklet is running (SMP only) */ -+ TASKLET_STATE_PENDING /* Tasklet is pending */ - }; - --#ifdef CONFIG_SMP -+#define TASKLET_STATEF_SCHED (1 << TASKLET_STATE_SCHED) -+#define TASKLET_STATEF_RUN (1 << TASKLET_STATE_RUN) -+#define TASKLET_STATEF_PENDING (1 << TASKLET_STATE_PENDING) -+ -+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL) - static inline int tasklet_trylock(struct tasklet_struct *t) - { - return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); - } - -+static inline int tasklet_tryunlock(struct tasklet_struct *t) -+{ -+ return cmpxchg(&t->state, TASKLET_STATEF_RUN, 0) == TASKLET_STATEF_RUN; -+} -+ - static inline void tasklet_unlock(struct tasklet_struct *t) - { - smp_mb__before_atomic(); - clear_bit(TASKLET_STATE_RUN, &(t)->state); - } - --static inline void tasklet_unlock_wait(struct tasklet_struct *t) --{ -- while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } --} -+extern void tasklet_unlock_wait(struct tasklet_struct *t); -+ - #else - #define tasklet_trylock(t) 1 -+#define tasklet_tryunlock(t) 1 - #define tasklet_unlock_wait(t) do { } while (0) - #define tasklet_unlock(t) do { } while (0) - #endif -@@ -583,12 +614,7 @@ static inline void tasklet_disable(struct tasklet_struct *t) - smp_mb(); - } - --static inline void tasklet_enable(struct tasklet_struct *t) --{ -- smp_mb__before_atomic(); -- atomic_dec(&t->count); --} -- -+extern void tasklet_enable(struct tasklet_struct *t); - extern void tasklet_kill(struct tasklet_struct *t); - extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); - extern void tasklet_init(struct tasklet_struct *t, -@@ -619,6 +645,12 @@ void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer) - tasklet_kill(&ttimer->tasklet); - } - -+#ifdef CONFIG_PREEMPT_RT_FULL -+extern void softirq_early_init(void); -+#else -+static inline void softirq_early_init(void) { } -+#endif -+ - /* - * Autoprobing for irqs: - * -diff --git a/include/linux/irq.h b/include/linux/irq.h -index c4de62348ff2..7432b5e3d79c 100644 ---- a/include/linux/irq.h -+++ b/include/linux/irq.h -@@ -72,6 +72,7 @@ enum irqchip_irq_state; - * IRQ_IS_POLLED - Always polled by another interrupt. Exclude - * it from the spurious interrupt detection - * mechanism and from core side polling. -+ * IRQ_NO_SOFTIRQ_CALL - No softirq processing in the irq thread context (RT) - * IRQ_DISABLE_UNLAZY - Disable lazy irq disable - */ - enum { -@@ -99,13 +100,14 @@ enum { - IRQ_PER_CPU_DEVID = (1 << 17), - IRQ_IS_POLLED = (1 << 18), - IRQ_DISABLE_UNLAZY = (1 << 19), -+ IRQ_NO_SOFTIRQ_CALL = (1 << 20), - }; - - #define IRQF_MODIFY_MASK \ - (IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \ - IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \ - IRQ_PER_CPU | IRQ_NESTED_THREAD | IRQ_NOTHREAD | IRQ_PER_CPU_DEVID | \ -- IRQ_IS_POLLED | IRQ_DISABLE_UNLAZY) -+ IRQ_IS_POLLED | IRQ_DISABLE_UNLAZY | IRQ_NO_SOFTIRQ_CALL) - - #define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING) - -diff --git a/include/linux/irq_work.h b/include/linux/irq_work.h -index 47b9ebd4a74f..2543aab05daa 100644 ---- a/include/linux/irq_work.h -+++ b/include/linux/irq_work.h -@@ -16,6 +16,7 @@ - #define IRQ_WORK_BUSY 2UL - #define IRQ_WORK_FLAGS 3UL - #define IRQ_WORK_LAZY 4UL /* Doesn't want IPI, wait for tick */ -+#define IRQ_WORK_HARD_IRQ 8UL /* Run hard IRQ context, even on RT */ - - struct irq_work { - unsigned long flags; -@@ -51,4 +52,10 @@ static inline bool irq_work_needs_cpu(void) { return false; } - static inline void irq_work_run(void) { } - #endif - -+#if defined(CONFIG_IRQ_WORK) && defined(CONFIG_PREEMPT_RT_FULL) -+void irq_work_tick_soft(void); -+#else -+static inline void irq_work_tick_soft(void) { } -+#endif -+ - #endif /* _LINUX_IRQ_WORK_H */ -diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h -index dcca77c4b9d2..edb6573c9e0e 100644 ---- a/include/linux/irqdesc.h -+++ b/include/linux/irqdesc.h -@@ -64,6 +64,7 @@ struct irq_desc { - unsigned int irqs_unhandled; - atomic_t threads_handled; - int threads_handled_last; -+ u64 random_ip; - raw_spinlock_t lock; - struct cpumask *percpu_enabled; - #ifdef CONFIG_SMP -diff --git a/include/linux/irqflags.h b/include/linux/irqflags.h -index 5dd1272d1ab2..9b77034f7c5e 100644 ---- a/include/linux/irqflags.h -+++ b/include/linux/irqflags.h -@@ -25,8 +25,6 @@ - # define trace_softirqs_enabled(p) ((p)->softirqs_enabled) - # define trace_hardirq_enter() do { current->hardirq_context++; } while (0) - # define trace_hardirq_exit() do { current->hardirq_context--; } while (0) --# define lockdep_softirq_enter() do { current->softirq_context++; } while (0) --# define lockdep_softirq_exit() do { current->softirq_context--; } while (0) - # define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1, - #else - # define trace_hardirqs_on() do { } while (0) -@@ -39,9 +37,15 @@ - # define trace_softirqs_enabled(p) 0 - # define trace_hardirq_enter() do { } while (0) - # define trace_hardirq_exit() do { } while (0) -+# define INIT_TRACE_IRQFLAGS -+#endif -+ -+#if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT_FULL) -+# define lockdep_softirq_enter() do { current->softirq_context++; } while (0) -+# define lockdep_softirq_exit() do { current->softirq_context--; } while (0) -+#else - # define lockdep_softirq_enter() do { } while (0) - # define lockdep_softirq_exit() do { } while (0) --# define INIT_TRACE_IRQFLAGS - #endif - - #if defined(CONFIG_IRQSOFF_TRACER) || \ -@@ -148,4 +152,23 @@ - - #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) - -+/* -+ * local_irq* variants depending on RT/!RT -+ */ -+#ifdef CONFIG_PREEMPT_RT_FULL -+# define local_irq_disable_nort() do { } while (0) -+# define local_irq_enable_nort() do { } while (0) -+# define local_irq_save_nort(flags) local_save_flags(flags) -+# define local_irq_restore_nort(flags) (void)(flags) -+# define local_irq_disable_rt() local_irq_disable() -+# define local_irq_enable_rt() local_irq_enable() -+#else -+# define local_irq_disable_nort() local_irq_disable() -+# define local_irq_enable_nort() local_irq_enable() -+# define local_irq_save_nort(flags) local_irq_save(flags) -+# define local_irq_restore_nort(flags) local_irq_restore(flags) -+# define local_irq_disable_rt() do { } while (0) -+# define local_irq_enable_rt() do { } while (0) -+#endif -+ - #endif -diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h -index fd1083c46c61..1485e18b9c3b 100644 ---- a/include/linux/jbd2.h -+++ b/include/linux/jbd2.h -@@ -347,32 +347,56 @@ static inline struct journal_head *bh2jh(struct buffer_head *bh) - - static inline void jbd_lock_bh_state(struct buffer_head *bh) - { -+#ifndef CONFIG_PREEMPT_RT_BASE - bit_spin_lock(BH_State, &bh->b_state); -+#else -+ spin_lock(&bh->b_state_lock); -+#endif - } - - static inline int jbd_trylock_bh_state(struct buffer_head *bh) - { -+#ifndef CONFIG_PREEMPT_RT_BASE - return bit_spin_trylock(BH_State, &bh->b_state); -+#else -+ return spin_trylock(&bh->b_state_lock); -+#endif - } - - static inline int jbd_is_locked_bh_state(struct buffer_head *bh) - { -+#ifndef CONFIG_PREEMPT_RT_BASE - return bit_spin_is_locked(BH_State, &bh->b_state); -+#else -+ return spin_is_locked(&bh->b_state_lock); -+#endif - } - - static inline void jbd_unlock_bh_state(struct buffer_head *bh) - { -+#ifndef CONFIG_PREEMPT_RT_BASE - bit_spin_unlock(BH_State, &bh->b_state); -+#else -+ spin_unlock(&bh->b_state_lock); -+#endif - } - - static inline void jbd_lock_bh_journal_head(struct buffer_head *bh) - { -+#ifndef CONFIG_PREEMPT_RT_BASE - bit_spin_lock(BH_JournalHead, &bh->b_state); -+#else -+ spin_lock(&bh->b_journal_head_lock); -+#endif - } - - static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh) - { -+#ifndef CONFIG_PREEMPT_RT_BASE - bit_spin_unlock(BH_JournalHead, &bh->b_state); -+#else -+ spin_unlock(&bh->b_journal_head_lock); -+#endif - } - - #define J_ASSERT(assert) BUG_ON(!(assert)) -diff --git a/include/linux/kdb.h b/include/linux/kdb.h -index a19bcf9e762e..897495386446 100644 ---- a/include/linux/kdb.h -+++ b/include/linux/kdb.h -@@ -167,6 +167,7 @@ extern __printf(2, 0) int vkdb_printf(enum kdb_msgsrc src, const char *fmt, - extern __printf(1, 2) int kdb_printf(const char *, ...); - typedef __printf(1, 2) int (*kdb_printf_t)(const char *, ...); - -+#define in_kdb_printk() (kdb_trap_printk) - extern void kdb_init(int level); - - /* Access to kdb specific polling devices */ -@@ -201,6 +202,7 @@ extern int kdb_register_flags(char *, kdb_func_t, char *, char *, - extern int kdb_unregister(char *); - #else /* ! CONFIG_KGDB_KDB */ - static inline __printf(1, 2) int kdb_printf(const char *fmt, ...) { return 0; } -+#define in_kdb_printk() (0) - static inline void kdb_init(int level) {} - static inline int kdb_register(char *cmd, kdb_func_t func, char *usage, - char *help, short minlen) { return 0; } -diff --git a/include/linux/kernel.h b/include/linux/kernel.h -index 2f7775e229b0..a7f8e266ab50 100644 ---- a/include/linux/kernel.h -+++ b/include/linux/kernel.h -@@ -188,6 +188,9 @@ extern int _cond_resched(void); - */ - # define might_sleep() \ - do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) -+ -+# define might_sleep_no_state_check() \ -+ do { ___might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) - # define sched_annotate_sleep() (current->task_state_change = 0) - #else - static inline void ___might_sleep(const char *file, int line, -@@ -195,6 +198,7 @@ extern int _cond_resched(void); - static inline void __might_sleep(const char *file, int line, - int preempt_offset) { } - # define might_sleep() do { might_resched(); } while (0) -+# define might_sleep_no_state_check() do { might_resched(); } while (0) - # define sched_annotate_sleep() do { } while (0) - #endif - -@@ -484,6 +488,7 @@ extern enum system_states { - SYSTEM_HALT, - SYSTEM_POWER_OFF, - SYSTEM_RESTART, -+ SYSTEM_SUSPEND, - } system_state; - - #define TAINT_PROPRIETARY_MODULE 0 -diff --git a/include/linux/lglock.h b/include/linux/lglock.h -index c92ebd100d9b..6f035f635d0e 100644 ---- a/include/linux/lglock.h -+++ b/include/linux/lglock.h -@@ -34,13 +34,30 @@ - #endif - - struct lglock { -+#ifdef CONFIG_PREEMPT_RT_FULL -+ struct rt_mutex __percpu *lock; -+#else - arch_spinlock_t __percpu *lock; -+#endif - #ifdef CONFIG_DEBUG_LOCK_ALLOC - struct lock_class_key lock_key; - struct lockdep_map lock_dep_map; - #endif - }; - -+#ifdef CONFIG_PREEMPT_RT_FULL -+# define DEFINE_LGLOCK(name) \ -+ static DEFINE_PER_CPU(struct rt_mutex, name ## _lock) \ -+ = __RT_MUTEX_INITIALIZER( name ## _lock); \ -+ struct lglock name = { .lock = &name ## _lock } -+ -+# define DEFINE_STATIC_LGLOCK(name) \ -+ static DEFINE_PER_CPU(struct rt_mutex, name ## _lock) \ -+ = __RT_MUTEX_INITIALIZER( name ## _lock); \ -+ static struct lglock name = { .lock = &name ## _lock } -+ -+#else -+ - #define DEFINE_LGLOCK(name) \ - static DEFINE_PER_CPU(arch_spinlock_t, name ## _lock) \ - = __ARCH_SPIN_LOCK_UNLOCKED; \ -@@ -50,6 +67,7 @@ struct lglock { - static DEFINE_PER_CPU(arch_spinlock_t, name ## _lock) \ - = __ARCH_SPIN_LOCK_UNLOCKED; \ - static struct lglock name = { .lock = &name ## _lock } -+#endif - - void lg_lock_init(struct lglock *lg, char *name); - -@@ -64,6 +82,12 @@ void lg_double_unlock(struct lglock *lg, int cpu1, int cpu2); - void lg_global_lock(struct lglock *lg); - void lg_global_unlock(struct lglock *lg); - -+#ifndef CONFIG_PREEMPT_RT_FULL -+#define lg_global_trylock_relax(name) lg_global_lock(name) -+#else -+void lg_global_trylock_relax(struct lglock *lg); -+#endif -+ - #else - /* When !CONFIG_SMP, map lglock to spinlock */ - #define lglock spinlock -diff --git a/include/linux/list.h b/include/linux/list.h -index 5356f4d661a7..3df0783a25e4 100644 ---- a/include/linux/list.h -+++ b/include/linux/list.h -@@ -679,6 +679,16 @@ static inline bool hlist_fake(struct hlist_node *h) - } - - /* -+ * Check whether the node is the only node of the head without -+ * accessing head. -+ */ -+static inline bool hlist_is_singular_node(struct hlist_node *n, -+ struct hlist_head *h) -+{ -+ return !n->next && n->pprev == &h->first; -+} -+ -+/* - * Move a list from one list head to another. Fixup the pprev - * reference of the first entry if it exists. - */ -diff --git a/include/linux/list_bl.h b/include/linux/list_bl.h -index cb483305e1f5..4e5062316bb6 100644 ---- a/include/linux/list_bl.h -+++ b/include/linux/list_bl.h -@@ -2,6 +2,7 @@ - #define _LINUX_LIST_BL_H - - #include <linux/list.h> -+#include <linux/spinlock.h> - #include <linux/bit_spinlock.h> - - /* -@@ -32,13 +33,24 @@ - - struct hlist_bl_head { - struct hlist_bl_node *first; -+#ifdef CONFIG_PREEMPT_RT_BASE -+ raw_spinlock_t lock; -+#endif - }; - - struct hlist_bl_node { - struct hlist_bl_node *next, **pprev; - }; --#define INIT_HLIST_BL_HEAD(ptr) \ -- ((ptr)->first = NULL) -+ -+#ifdef CONFIG_PREEMPT_RT_BASE -+#define INIT_HLIST_BL_HEAD(h) \ -+do { \ -+ (h)->first = NULL; \ -+ raw_spin_lock_init(&(h)->lock); \ -+} while (0) -+#else -+#define INIT_HLIST_BL_HEAD(h) (h)->first = NULL -+#endif - - static inline void INIT_HLIST_BL_NODE(struct hlist_bl_node *h) - { -@@ -118,12 +130,26 @@ static inline void hlist_bl_del_init(struct hlist_bl_node *n) - - static inline void hlist_bl_lock(struct hlist_bl_head *b) - { -+#ifndef CONFIG_PREEMPT_RT_BASE - bit_spin_lock(0, (unsigned long *)b); -+#else -+ raw_spin_lock(&b->lock); -+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) -+ __set_bit(0, (unsigned long *)b); -+#endif -+#endif - } - - static inline void hlist_bl_unlock(struct hlist_bl_head *b) - { -+#ifndef CONFIG_PREEMPT_RT_BASE - __bit_spin_unlock(0, (unsigned long *)b); -+#else -+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) -+ __clear_bit(0, (unsigned long *)b); -+#endif -+ raw_spin_unlock(&b->lock); -+#endif - } - - static inline bool hlist_bl_is_locked(struct hlist_bl_head *b) -diff --git a/include/linux/locallock.h b/include/linux/locallock.h -new file mode 100644 -index 000000000000..845c77f1a5ca ---- /dev/null -+++ b/include/linux/locallock.h -@@ -0,0 +1,278 @@ -+#ifndef _LINUX_LOCALLOCK_H -+#define _LINUX_LOCALLOCK_H -+ -+#include <linux/percpu.h> -+#include <linux/spinlock.h> -+ -+#ifdef CONFIG_PREEMPT_RT_BASE -+ -+#ifdef CONFIG_DEBUG_SPINLOCK -+# define LL_WARN(cond) WARN_ON(cond) -+#else -+# define LL_WARN(cond) do { } while (0) -+#endif -+ -+/* -+ * per cpu lock based substitute for local_irq_*() -+ */ -+struct local_irq_lock { -+ spinlock_t lock; -+ struct task_struct *owner; -+ int nestcnt; -+ unsigned long flags; -+}; -+ -+#define DEFINE_LOCAL_IRQ_LOCK(lvar) \ -+ DEFINE_PER_CPU(struct local_irq_lock, lvar) = { \ -+ .lock = __SPIN_LOCK_UNLOCKED((lvar).lock) } -+ -+#define DECLARE_LOCAL_IRQ_LOCK(lvar) \ -+ DECLARE_PER_CPU(struct local_irq_lock, lvar) -+ -+#define local_irq_lock_init(lvar) \ -+ do { \ -+ int __cpu; \ -+ for_each_possible_cpu(__cpu) \ -+ spin_lock_init(&per_cpu(lvar, __cpu).lock); \ -+ } while (0) -+ -+/* -+ * spin_lock|trylock|unlock_local flavour that does not migrate disable -+ * used for __local_lock|trylock|unlock where get_local_var/put_local_var -+ * already takes care of the migrate_disable/enable -+ * for CONFIG_PREEMPT_BASE map to the normal spin_* calls. -+ */ -+#ifdef CONFIG_PREEMPT_RT_FULL -+# define spin_lock_local(lock) rt_spin_lock__no_mg(lock) -+# define spin_trylock_local(lock) rt_spin_trylock__no_mg(lock) -+# define spin_unlock_local(lock) rt_spin_unlock__no_mg(lock) -+#else -+# define spin_lock_local(lock) spin_lock(lock) -+# define spin_trylock_local(lock) spin_trylock(lock) -+# define spin_unlock_local(lock) spin_unlock(lock) -+#endif -+ -+static inline void __local_lock(struct local_irq_lock *lv) -+{ -+ if (lv->owner != current) { -+ spin_lock_local(&lv->lock); -+ LL_WARN(lv->owner); -+ LL_WARN(lv->nestcnt); -+ lv->owner = current; -+ } -+ lv->nestcnt++; -+} -+ -+#define local_lock(lvar) \ -+ do { __local_lock(&get_local_var(lvar)); } while (0) -+ -+#define local_lock_on(lvar, cpu) \ -+ do { __local_lock(&per_cpu(lvar, cpu)); } while (0) -+ -+static inline int __local_trylock(struct local_irq_lock *lv) -+{ -+ if (lv->owner != current && spin_trylock_local(&lv->lock)) { -+ LL_WARN(lv->owner); -+ LL_WARN(lv->nestcnt); -+ lv->owner = current; -+ lv->nestcnt = 1; -+ return 1; -+ } -+ return 0; -+} -+ -+#define local_trylock(lvar) \ -+ ({ \ -+ int __locked; \ -+ __locked = __local_trylock(&get_local_var(lvar)); \ -+ if (!__locked) \ -+ put_local_var(lvar); \ -+ __locked; \ -+ }) -+ -+static inline void __local_unlock(struct local_irq_lock *lv) -+{ -+ LL_WARN(lv->nestcnt == 0); -+ LL_WARN(lv->owner != current); -+ if (--lv->nestcnt) -+ return; -+ -+ lv->owner = NULL; -+ spin_unlock_local(&lv->lock); -+} -+ -+#define local_unlock(lvar) \ -+ do { \ -+ __local_unlock(this_cpu_ptr(&lvar)); \ -+ put_local_var(lvar); \ -+ } while (0) -+ -+#define local_unlock_on(lvar, cpu) \ -+ do { __local_unlock(&per_cpu(lvar, cpu)); } while (0) -+ -+static inline void __local_lock_irq(struct local_irq_lock *lv) -+{ -+ spin_lock_irqsave(&lv->lock, lv->flags); -+ LL_WARN(lv->owner); -+ LL_WARN(lv->nestcnt); -+ lv->owner = current; -+ lv->nestcnt = 1; -+} -+ -+#define local_lock_irq(lvar) \ -+ do { __local_lock_irq(&get_local_var(lvar)); } while (0) -+ -+#define local_lock_irq_on(lvar, cpu) \ -+ do { __local_lock_irq(&per_cpu(lvar, cpu)); } while (0) -+ -+static inline void __local_unlock_irq(struct local_irq_lock *lv) -+{ -+ LL_WARN(!lv->nestcnt); -+ LL_WARN(lv->owner != current); -+ lv->owner = NULL; -+ lv->nestcnt = 0; -+ spin_unlock_irq(&lv->lock); -+} -+ -+#define local_unlock_irq(lvar) \ -+ do { \ -+ __local_unlock_irq(this_cpu_ptr(&lvar)); \ -+ put_local_var(lvar); \ -+ } while (0) -+ -+#define local_unlock_irq_on(lvar, cpu) \ -+ do { \ -+ __local_unlock_irq(&per_cpu(lvar, cpu)); \ -+ } while (0) -+ -+static inline int __local_lock_irqsave(struct local_irq_lock *lv) -+{ -+ if (lv->owner != current) { -+ __local_lock_irq(lv); -+ return 0; -+ } else { -+ lv->nestcnt++; -+ return 1; -+ } -+} -+ -+#define local_lock_irqsave(lvar, _flags) \ -+ do { \ -+ if (__local_lock_irqsave(&get_local_var(lvar))) \ -+ put_local_var(lvar); \ -+ _flags = __this_cpu_read(lvar.flags); \ -+ } while (0) -+ -+#define local_lock_irqsave_on(lvar, _flags, cpu) \ -+ do { \ -+ __local_lock_irqsave(&per_cpu(lvar, cpu)); \ -+ _flags = per_cpu(lvar, cpu).flags; \ -+ } while (0) -+ -+static inline int __local_unlock_irqrestore(struct local_irq_lock *lv, -+ unsigned long flags) -+{ -+ LL_WARN(!lv->nestcnt); -+ LL_WARN(lv->owner != current); -+ if (--lv->nestcnt) -+ return 0; -+ -+ lv->owner = NULL; -+ spin_unlock_irqrestore(&lv->lock, lv->flags); -+ return 1; -+} -+ -+#define local_unlock_irqrestore(lvar, flags) \ -+ do { \ -+ if (__local_unlock_irqrestore(this_cpu_ptr(&lvar), flags)) \ -+ put_local_var(lvar); \ -+ } while (0) -+ -+#define local_unlock_irqrestore_on(lvar, flags, cpu) \ -+ do { \ -+ __local_unlock_irqrestore(&per_cpu(lvar, cpu), flags); \ -+ } while (0) -+ -+#define local_spin_trylock_irq(lvar, lock) \ -+ ({ \ -+ int __locked; \ -+ local_lock_irq(lvar); \ -+ __locked = spin_trylock(lock); \ -+ if (!__locked) \ -+ local_unlock_irq(lvar); \ -+ __locked; \ -+ }) -+ -+#define local_spin_lock_irq(lvar, lock) \ -+ do { \ -+ local_lock_irq(lvar); \ -+ spin_lock(lock); \ -+ } while (0) -+ -+#define local_spin_unlock_irq(lvar, lock) \ -+ do { \ -+ spin_unlock(lock); \ -+ local_unlock_irq(lvar); \ -+ } while (0) -+ -+#define local_spin_lock_irqsave(lvar, lock, flags) \ -+ do { \ -+ local_lock_irqsave(lvar, flags); \ -+ spin_lock(lock); \ -+ } while (0) -+ -+#define local_spin_unlock_irqrestore(lvar, lock, flags) \ -+ do { \ -+ spin_unlock(lock); \ -+ local_unlock_irqrestore(lvar, flags); \ -+ } while (0) -+ -+#define get_locked_var(lvar, var) \ -+ (*({ \ -+ local_lock(lvar); \ -+ this_cpu_ptr(&var); \ -+ })) -+ -+#define put_locked_var(lvar, var) local_unlock(lvar); -+ -+#define local_lock_cpu(lvar) \ -+ ({ \ -+ local_lock(lvar); \ -+ smp_processor_id(); \ -+ }) -+ -+#define local_unlock_cpu(lvar) local_unlock(lvar) -+ -+#else /* PREEMPT_RT_BASE */ -+ -+#define DEFINE_LOCAL_IRQ_LOCK(lvar) __typeof__(const int) lvar -+#define DECLARE_LOCAL_IRQ_LOCK(lvar) extern __typeof__(const int) lvar -+ -+static inline void local_irq_lock_init(int lvar) { } -+ -+#define local_lock(lvar) preempt_disable() -+#define local_unlock(lvar) preempt_enable() -+#define local_lock_irq(lvar) local_irq_disable() -+#define local_lock_irq_on(lvar, cpu) local_irq_disable() -+#define local_unlock_irq(lvar) local_irq_enable() -+#define local_unlock_irq_on(lvar, cpu) local_irq_enable() -+#define local_lock_irqsave(lvar, flags) local_irq_save(flags) -+#define local_unlock_irqrestore(lvar, flags) local_irq_restore(flags) -+ -+#define local_spin_trylock_irq(lvar, lock) spin_trylock_irq(lock) -+#define local_spin_lock_irq(lvar, lock) spin_lock_irq(lock) -+#define local_spin_unlock_irq(lvar, lock) spin_unlock_irq(lock) -+#define local_spin_lock_irqsave(lvar, lock, flags) \ -+ spin_lock_irqsave(lock, flags) -+#define local_spin_unlock_irqrestore(lvar, lock, flags) \ -+ spin_unlock_irqrestore(lock, flags) -+ -+#define get_locked_var(lvar, var) get_cpu_var(var) -+#define put_locked_var(lvar, var) put_cpu_var(var) -+ -+#define local_lock_cpu(lvar) get_cpu() -+#define local_unlock_cpu(lvar) put_cpu() -+ -+#endif -+ -+#endif -diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h -index c2d75b4fa86c..8349504e0bbe 100644 ---- a/include/linux/mm_types.h -+++ b/include/linux/mm_types.h -@@ -11,6 +11,7 @@ - #include <linux/completion.h> - #include <linux/cpumask.h> - #include <linux/uprobes.h> -+#include <linux/rcupdate.h> - #include <linux/page-flags-layout.h> - #include <asm/page.h> - #include <asm/mmu.h> -@@ -502,6 +503,9 @@ struct mm_struct { - bool tlb_flush_pending; - #endif - struct uprobes_state uprobes_state; -+#ifdef CONFIG_PREEMPT_RT_BASE -+ struct rcu_head delayed_drop; -+#endif - #ifdef CONFIG_X86_INTEL_MPX - /* address of the bounds directory */ - void __user *bd_addr; -diff --git a/include/linux/mutex.h b/include/linux/mutex.h -index 2cb7531e7d7a..b3fdfc820216 100644 ---- a/include/linux/mutex.h -+++ b/include/linux/mutex.h -@@ -19,6 +19,17 @@ - #include <asm/processor.h> - #include <linux/osq_lock.h> - -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \ -+ , .dep_map = { .name = #lockname } -+#else -+# define __DEP_MAP_MUTEX_INITIALIZER(lockname) -+#endif -+ -+#ifdef CONFIG_PREEMPT_RT_FULL -+# include <linux/mutex_rt.h> -+#else -+ - /* - * Simple, straightforward mutexes with strict semantics: - * -@@ -99,13 +110,6 @@ do { \ - static inline void mutex_destroy(struct mutex *lock) {} - #endif - --#ifdef CONFIG_DEBUG_LOCK_ALLOC --# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \ -- , .dep_map = { .name = #lockname } --#else --# define __DEP_MAP_MUTEX_INITIALIZER(lockname) --#endif -- - #define __MUTEX_INITIALIZER(lockname) \ - { .count = ATOMIC_INIT(1) \ - , .wait_lock = __SPIN_LOCK_UNLOCKED(lockname.wait_lock) \ -@@ -173,6 +177,8 @@ extern int __must_check mutex_lock_killable(struct mutex *lock); - extern int mutex_trylock(struct mutex *lock); - extern void mutex_unlock(struct mutex *lock); - -+#endif /* !PREEMPT_RT_FULL */ -+ - extern int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock); - - #endif /* __LINUX_MUTEX_H */ -diff --git a/include/linux/mutex_rt.h b/include/linux/mutex_rt.h -new file mode 100644 -index 000000000000..c38a44b14da5 ---- /dev/null -+++ b/include/linux/mutex_rt.h -@@ -0,0 +1,84 @@ -+#ifndef __LINUX_MUTEX_RT_H -+#define __LINUX_MUTEX_RT_H -+ -+#ifndef __LINUX_MUTEX_H -+#error "Please include mutex.h" -+#endif -+ -+#include <linux/rtmutex.h> -+ -+/* FIXME: Just for __lockfunc */ -+#include <linux/spinlock.h> -+ -+struct mutex { -+ struct rt_mutex lock; -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+ struct lockdep_map dep_map; -+#endif -+}; -+ -+#define __MUTEX_INITIALIZER(mutexname) \ -+ { \ -+ .lock = __RT_MUTEX_INITIALIZER(mutexname.lock) \ -+ __DEP_MAP_MUTEX_INITIALIZER(mutexname) \ -+ } -+ -+#define DEFINE_MUTEX(mutexname) \ -+ struct mutex mutexname = __MUTEX_INITIALIZER(mutexname) -+ -+extern void __mutex_do_init(struct mutex *lock, const char *name, struct lock_class_key *key); -+extern void __lockfunc _mutex_lock(struct mutex *lock); -+extern int __lockfunc _mutex_lock_interruptible(struct mutex *lock); -+extern int __lockfunc _mutex_lock_killable(struct mutex *lock); -+extern void __lockfunc _mutex_lock_nested(struct mutex *lock, int subclass); -+extern void __lockfunc _mutex_lock_nest_lock(struct mutex *lock, struct lockdep_map *nest_lock); -+extern int __lockfunc _mutex_lock_interruptible_nested(struct mutex *lock, int subclass); -+extern int __lockfunc _mutex_lock_killable_nested(struct mutex *lock, int subclass); -+extern int __lockfunc _mutex_trylock(struct mutex *lock); -+extern void __lockfunc _mutex_unlock(struct mutex *lock); -+ -+#define mutex_is_locked(l) rt_mutex_is_locked(&(l)->lock) -+#define mutex_lock(l) _mutex_lock(l) -+#define mutex_lock_interruptible(l) _mutex_lock_interruptible(l) -+#define mutex_lock_killable(l) _mutex_lock_killable(l) -+#define mutex_trylock(l) _mutex_trylock(l) -+#define mutex_unlock(l) _mutex_unlock(l) -+#define mutex_destroy(l) rt_mutex_destroy(&(l)->lock) -+ -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+# define mutex_lock_nested(l, s) _mutex_lock_nested(l, s) -+# define mutex_lock_interruptible_nested(l, s) \ -+ _mutex_lock_interruptible_nested(l, s) -+# define mutex_lock_killable_nested(l, s) \ -+ _mutex_lock_killable_nested(l, s) -+ -+# define mutex_lock_nest_lock(lock, nest_lock) \ -+do { \ -+ typecheck(struct lockdep_map *, &(nest_lock)->dep_map); \ -+ _mutex_lock_nest_lock(lock, &(nest_lock)->dep_map); \ -+} while (0) -+ -+#else -+# define mutex_lock_nested(l, s) _mutex_lock(l) -+# define mutex_lock_interruptible_nested(l, s) \ -+ _mutex_lock_interruptible(l) -+# define mutex_lock_killable_nested(l, s) \ -+ _mutex_lock_killable(l) -+# define mutex_lock_nest_lock(lock, nest_lock) mutex_lock(lock) -+#endif -+ -+# define mutex_init(mutex) \ -+do { \ -+ static struct lock_class_key __key; \ -+ \ -+ rt_mutex_init(&(mutex)->lock); \ -+ __mutex_do_init((mutex), #mutex, &__key); \ -+} while (0) -+ -+# define __mutex_init(mutex, name, key) \ -+do { \ -+ rt_mutex_init(&(mutex)->lock); \ -+ __mutex_do_init((mutex), name, key); \ -+} while (0) -+ -+#endif -diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h -index 78181a88903b..06863e4f1172 100644 ---- a/include/linux/netdevice.h -+++ b/include/linux/netdevice.h -@@ -2396,11 +2396,20 @@ void netdev_freemem(struct net_device *dev); - void synchronize_net(void); - int init_dummy_netdev(struct net_device *dev); - -+#ifdef CONFIG_PREEMPT_RT_FULL -+static inline int dev_recursion_level(void) -+{ -+ return current->xmit_recursion; -+} -+ -+#else -+ - DECLARE_PER_CPU(int, xmit_recursion); - static inline int dev_recursion_level(void) - { - return this_cpu_read(xmit_recursion); - } -+#endif - - struct net_device *dev_get_by_index(struct net *net, int ifindex); - struct net_device *__dev_get_by_index(struct net *net, int ifindex); -@@ -2776,6 +2785,7 @@ struct softnet_data { - unsigned int dropped; - struct sk_buff_head input_pkt_queue; - struct napi_struct backlog; -+ struct sk_buff_head tofree_queue; - - }; - -diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h -index 4dd9306c9d56..6b13e8fd0aba 100644 ---- a/include/linux/netfilter/x_tables.h -+++ b/include/linux/netfilter/x_tables.h -@@ -4,6 +4,7 @@ - - #include <linux/netdevice.h> - #include <linux/static_key.h> -+#include <linux/locallock.h> - #include <uapi/linux/netfilter/x_tables.h> - - /** -@@ -292,6 +293,8 @@ void xt_free_table_info(struct xt_table_info *info); - */ - DECLARE_PER_CPU(seqcount_t, xt_recseq); - -+DECLARE_LOCAL_IRQ_LOCK(xt_write_lock); -+ - /* xt_tee_enabled - true if x_tables needs to handle reentrancy - * - * Enabled if current ip(6)tables ruleset has at least one -j TEE rule. -@@ -312,6 +315,9 @@ static inline unsigned int xt_write_recseq_begin(void) - { - unsigned int addend; - -+ /* RT protection */ -+ local_lock(xt_write_lock); -+ - /* - * Low order bit of sequence is set if we already - * called xt_write_recseq_begin(). -@@ -342,6 +348,7 @@ static inline void xt_write_recseq_end(unsigned int addend) - /* this is kind of a write_seqcount_end(), but addend is 0 or 1 */ - smp_wmb(); - __this_cpu_add(xt_recseq.sequence, addend); -+ local_unlock(xt_write_lock); - } - - /* -diff --git a/include/linux/notifier.h b/include/linux/notifier.h -index 4149868de4e6..babe5b9bcb91 100644 ---- a/include/linux/notifier.h -+++ b/include/linux/notifier.h -@@ -6,7 +6,7 @@ - * - * Alan Cox <Alan.Cox@linux.org> - */ -- -+ - #ifndef _LINUX_NOTIFIER_H - #define _LINUX_NOTIFIER_H - #include <linux/errno.h> -@@ -42,9 +42,7 @@ - * in srcu_notifier_call_chain(): no cache bounces and no memory barriers. - * As compensation, srcu_notifier_chain_unregister() is rather expensive. - * SRCU notifier chains should be used when the chain will be called very -- * often but notifier_blocks will seldom be removed. Also, SRCU notifier -- * chains are slightly more difficult to use because they require special -- * runtime initialization. -+ * often but notifier_blocks will seldom be removed. - */ - - struct notifier_block; -@@ -90,7 +88,7 @@ struct srcu_notifier_head { - (name)->head = NULL; \ - } while (0) - --/* srcu_notifier_heads must be initialized and cleaned up dynamically */ -+/* srcu_notifier_heads must be cleaned up dynamically */ - extern void srcu_init_notifier_head(struct srcu_notifier_head *nh); - #define srcu_cleanup_notifier_head(name) \ - cleanup_srcu_struct(&(name)->srcu); -@@ -103,7 +101,13 @@ extern void srcu_init_notifier_head(struct srcu_notifier_head *nh); - .head = NULL } - #define RAW_NOTIFIER_INIT(name) { \ - .head = NULL } --/* srcu_notifier_heads cannot be initialized statically */ -+ -+#define SRCU_NOTIFIER_INIT(name, pcpu) \ -+ { \ -+ .mutex = __MUTEX_INITIALIZER(name.mutex), \ -+ .head = NULL, \ -+ .srcu = __SRCU_STRUCT_INIT(name.srcu, pcpu), \ -+ } - - #define ATOMIC_NOTIFIER_HEAD(name) \ - struct atomic_notifier_head name = \ -@@ -115,6 +119,18 @@ extern void srcu_init_notifier_head(struct srcu_notifier_head *nh); - struct raw_notifier_head name = \ - RAW_NOTIFIER_INIT(name) - -+#define _SRCU_NOTIFIER_HEAD(name, mod) \ -+ static DEFINE_PER_CPU(struct srcu_struct_array, \ -+ name##_head_srcu_array); \ -+ mod struct srcu_notifier_head name = \ -+ SRCU_NOTIFIER_INIT(name, name##_head_srcu_array) -+ -+#define SRCU_NOTIFIER_HEAD(name) \ -+ _SRCU_NOTIFIER_HEAD(name, ) -+ -+#define SRCU_NOTIFIER_HEAD_STATIC(name) \ -+ _SRCU_NOTIFIER_HEAD(name, static) -+ - #ifdef __KERNEL__ - - extern int atomic_notifier_chain_register(struct atomic_notifier_head *nh, -@@ -184,12 +200,12 @@ static inline int notifier_to_errno(int ret) - - /* - * Declared notifiers so far. I can imagine quite a few more chains -- * over time (eg laptop power reset chains, reboot chain (to clean -+ * over time (eg laptop power reset chains, reboot chain (to clean - * device units up), device [un]mount chain, module load/unload chain, -- * low memory chain, screenblank chain (for plug in modular screenblankers) -+ * low memory chain, screenblank chain (for plug in modular screenblankers) - * VC switch chains (for loadable kernel svgalib VC switch helpers) etc... - */ -- -+ - /* CPU notfiers are defined in include/linux/cpu.h. */ - - /* netdevice notifiers are defined in include/linux/netdevice.h */ -diff --git a/include/linux/percpu.h b/include/linux/percpu.h -index 4bc6dafb703e..c0b6779d8f67 100644 ---- a/include/linux/percpu.h -+++ b/include/linux/percpu.h -@@ -18,6 +18,35 @@ - #define PERCPU_MODULE_RESERVE 0 - #endif - -+#ifdef CONFIG_PREEMPT_RT_FULL -+ -+#define get_local_var(var) (*({ \ -+ migrate_disable(); \ -+ this_cpu_ptr(&var); })) -+ -+#define put_local_var(var) do { \ -+ (void)&(var); \ -+ migrate_enable(); \ -+} while (0) -+ -+# define get_local_ptr(var) ({ \ -+ migrate_disable(); \ -+ this_cpu_ptr(var); }) -+ -+# define put_local_ptr(var) do { \ -+ (void)(var); \ -+ migrate_enable(); \ -+} while (0) -+ -+#else -+ -+#define get_local_var(var) get_cpu_var(var) -+#define put_local_var(var) put_cpu_var(var) -+#define get_local_ptr(var) get_cpu_ptr(var) -+#define put_local_ptr(var) put_cpu_ptr(var) -+ -+#endif -+ - /* minimum unit size, also is the maximum supported allocation size */ - #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10) - -diff --git a/include/linux/pid.h b/include/linux/pid.h -index 23705a53abba..2cc64b779f03 100644 ---- a/include/linux/pid.h -+++ b/include/linux/pid.h -@@ -2,6 +2,7 @@ - #define _LINUX_PID_H - - #include <linux/rcupdate.h> -+#include <linux/atomic.h> - - enum pid_type - { -diff --git a/include/linux/preempt.h b/include/linux/preempt.h -index 75e4e30677f1..1cfb1cb72354 100644 ---- a/include/linux/preempt.h -+++ b/include/linux/preempt.h -@@ -50,7 +50,11 @@ - #define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT) - #define NMI_OFFSET (1UL << NMI_SHIFT) - --#define SOFTIRQ_DISABLE_OFFSET (2 * SOFTIRQ_OFFSET) -+#ifndef CONFIG_PREEMPT_RT_FULL -+# define SOFTIRQ_DISABLE_OFFSET (2 * SOFTIRQ_OFFSET) -+#else -+# define SOFTIRQ_DISABLE_OFFSET (0) -+#endif - - /* We use the MSB mostly because its available */ - #define PREEMPT_NEED_RESCHED 0x80000000 -@@ -59,9 +63,15 @@ - #include <asm/preempt.h> - - #define hardirq_count() (preempt_count() & HARDIRQ_MASK) --#define softirq_count() (preempt_count() & SOFTIRQ_MASK) - #define irq_count() (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK \ - | NMI_MASK)) -+#ifndef CONFIG_PREEMPT_RT_FULL -+# define softirq_count() (preempt_count() & SOFTIRQ_MASK) -+# define in_serving_softirq() (softirq_count() & SOFTIRQ_OFFSET) -+#else -+# define softirq_count() (0UL) -+extern int in_serving_softirq(void); -+#endif - - /* - * Are we doing bottom half or hardware interrupt processing? -@@ -72,7 +82,6 @@ - #define in_irq() (hardirq_count()) - #define in_softirq() (softirq_count()) - #define in_interrupt() (irq_count()) --#define in_serving_softirq() (softirq_count() & SOFTIRQ_OFFSET) - - /* - * Are we in NMI context? -@@ -91,7 +100,11 @@ - /* - * The preempt_count offset after spin_lock() - */ -+#if !defined(CONFIG_PREEMPT_RT_FULL) - #define PREEMPT_LOCK_OFFSET PREEMPT_DISABLE_OFFSET -+#else -+#define PREEMPT_LOCK_OFFSET 0 -+#endif - - /* - * The preempt_count offset needed for things like: -@@ -140,6 +153,20 @@ extern void preempt_count_sub(int val); - #define preempt_count_inc() preempt_count_add(1) - #define preempt_count_dec() preempt_count_sub(1) - -+#ifdef CONFIG_PREEMPT_LAZY -+#define add_preempt_lazy_count(val) do { preempt_lazy_count() += (val); } while (0) -+#define sub_preempt_lazy_count(val) do { preempt_lazy_count() -= (val); } while (0) -+#define inc_preempt_lazy_count() add_preempt_lazy_count(1) -+#define dec_preempt_lazy_count() sub_preempt_lazy_count(1) -+#define preempt_lazy_count() (current_thread_info()->preempt_lazy_count) -+#else -+#define add_preempt_lazy_count(val) do { } while (0) -+#define sub_preempt_lazy_count(val) do { } while (0) -+#define inc_preempt_lazy_count() do { } while (0) -+#define dec_preempt_lazy_count() do { } while (0) -+#define preempt_lazy_count() (0) -+#endif -+ - #ifdef CONFIG_PREEMPT_COUNT - - #define preempt_disable() \ -@@ -148,13 +175,25 @@ do { \ - barrier(); \ - } while (0) - -+#define preempt_lazy_disable() \ -+do { \ -+ inc_preempt_lazy_count(); \ -+ barrier(); \ -+} while (0) -+ - #define sched_preempt_enable_no_resched() \ - do { \ - barrier(); \ - preempt_count_dec(); \ - } while (0) - --#define preempt_enable_no_resched() sched_preempt_enable_no_resched() -+#ifdef CONFIG_PREEMPT_RT_BASE -+# define preempt_enable_no_resched() sched_preempt_enable_no_resched() -+# define preempt_check_resched_rt() preempt_check_resched() -+#else -+# define preempt_enable_no_resched() preempt_enable() -+# define preempt_check_resched_rt() barrier(); -+#endif - - #define preemptible() (preempt_count() == 0 && !irqs_disabled()) - -@@ -179,6 +218,13 @@ do { \ - __preempt_schedule(); \ - } while (0) - -+#define preempt_lazy_enable() \ -+do { \ -+ dec_preempt_lazy_count(); \ -+ barrier(); \ -+ preempt_check_resched(); \ -+} while (0) -+ - #else /* !CONFIG_PREEMPT */ - #define preempt_enable() \ - do { \ -@@ -224,6 +270,7 @@ do { \ - #define preempt_disable_notrace() barrier() - #define preempt_enable_no_resched_notrace() barrier() - #define preempt_enable_notrace() barrier() -+#define preempt_check_resched_rt() barrier() - #define preemptible() 0 - - #endif /* CONFIG_PREEMPT_COUNT */ -@@ -244,10 +291,31 @@ do { \ - } while (0) - #define preempt_fold_need_resched() \ - do { \ -- if (tif_need_resched()) \ -+ if (tif_need_resched_now()) \ - set_preempt_need_resched(); \ - } while (0) - -+#ifdef CONFIG_PREEMPT_RT_FULL -+# define preempt_disable_rt() preempt_disable() -+# define preempt_enable_rt() preempt_enable() -+# define preempt_disable_nort() barrier() -+# define preempt_enable_nort() barrier() -+# ifdef CONFIG_SMP -+ extern void migrate_disable(void); -+ extern void migrate_enable(void); -+# else /* CONFIG_SMP */ -+# define migrate_disable() barrier() -+# define migrate_enable() barrier() -+# endif /* CONFIG_SMP */ -+#else -+# define preempt_disable_rt() barrier() -+# define preempt_enable_rt() barrier() -+# define preempt_disable_nort() preempt_disable() -+# define preempt_enable_nort() preempt_enable() -+# define migrate_disable() preempt_disable() -+# define migrate_enable() preempt_enable() -+#endif -+ - #ifdef CONFIG_PREEMPT_NOTIFIERS - - struct preempt_notifier; -diff --git a/include/linux/printk.h b/include/linux/printk.h -index 9ccbdf2c1453..428d6a7fa4e8 100644 ---- a/include/linux/printk.h -+++ b/include/linux/printk.h -@@ -117,9 +117,11 @@ do { \ - #ifdef CONFIG_EARLY_PRINTK - extern asmlinkage __printf(1, 2) - void early_printk(const char *fmt, ...); -+extern void printk_kill(void); - #else - static inline __printf(1, 2) __cold - void early_printk(const char *s, ...) { } -+static inline void printk_kill(void) { } - #endif - - typedef __printf(1, 0) int (*printk_func_t)(const char *fmt, va_list args); -diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h -index 51a97ac8bfbf..0608483c91fc 100644 ---- a/include/linux/radix-tree.h -+++ b/include/linux/radix-tree.h -@@ -294,8 +294,13 @@ radix_tree_gang_lookup(struct radix_tree_root *root, void **results, - unsigned int radix_tree_gang_lookup_slot(struct radix_tree_root *root, - void ***results, unsigned long *indices, - unsigned long first_index, unsigned int max_items); -+#ifndef CONFIG_PREEMPT_RT_FULL - int radix_tree_preload(gfp_t gfp_mask); - int radix_tree_maybe_preload(gfp_t gfp_mask); -+#else -+static inline int radix_tree_preload(gfp_t gm) { return 0; } -+static inline int radix_tree_maybe_preload(gfp_t gfp_mask) { return 0; } -+#endif - void radix_tree_init(void); - void *radix_tree_tag_set(struct radix_tree_root *root, - unsigned long index, unsigned int tag); -@@ -320,7 +325,7 @@ unsigned long radix_tree_locate_item(struct radix_tree_root *root, void *item); - - static inline void radix_tree_preload_end(void) - { -- preempt_enable(); -+ preempt_enable_nort(); - } - - /** -diff --git a/include/linux/random.h b/include/linux/random.h -index 9c29122037f9..e7f2f8604918 100644 ---- a/include/linux/random.h -+++ b/include/linux/random.h -@@ -20,7 +20,7 @@ struct random_ready_callback { - extern void add_device_randomness(const void *, unsigned int); - extern void add_input_randomness(unsigned int type, unsigned int code, - unsigned int value); --extern void add_interrupt_randomness(int irq, int irq_flags); -+extern void add_interrupt_randomness(int irq, int irq_flags, __u64 ip); - - extern void get_random_bytes(void *buf, int nbytes); - extern int add_random_ready_callback(struct random_ready_callback *rdy); -diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h -index b6900099ea81..fdc2e95173e0 100644 ---- a/include/linux/rbtree.h -+++ b/include/linux/rbtree.h -@@ -31,7 +31,6 @@ - - #include <linux/kernel.h> - #include <linux/stddef.h> --#include <linux/rcupdate.h> - - struct rb_node { - unsigned long __rb_parent_color; -@@ -86,14 +85,8 @@ static inline void rb_link_node(struct rb_node *node, struct rb_node *parent, - *rb_link = node; - } - --static inline void rb_link_node_rcu(struct rb_node *node, struct rb_node *parent, -- struct rb_node **rb_link) --{ -- node->__rb_parent_color = (unsigned long)parent; -- node->rb_left = node->rb_right = NULL; -- -- rcu_assign_pointer(*rb_link, node); --} -+void rb_link_node_rcu(struct rb_node *node, struct rb_node *parent, -+ struct rb_node **rb_link); - - #define rb_entry_safe(ptr, type, member) \ - ({ typeof(ptr) ____ptr = (ptr); \ -diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h -index 2657aff2725b..ea90179fee34 100644 ---- a/include/linux/rcupdate.h -+++ b/include/linux/rcupdate.h -@@ -177,6 +177,9 @@ void call_rcu(struct rcu_head *head, - - #endif /* #else #ifdef CONFIG_PREEMPT_RCU */ - -+#ifdef CONFIG_PREEMPT_RT_FULL -+#define call_rcu_bh call_rcu -+#else - /** - * call_rcu_bh() - Queue an RCU for invocation after a quicker grace period. - * @head: structure to be used for queueing the RCU updates. -@@ -200,6 +203,7 @@ void call_rcu(struct rcu_head *head, - */ - void call_rcu_bh(struct rcu_head *head, - rcu_callback_t func); -+#endif - - /** - * call_rcu_sched() - Queue an RCU for invocation after sched grace period. -@@ -300,6 +304,11 @@ void synchronize_rcu(void); - * types of kernel builds, the rcu_read_lock() nesting depth is unknowable. - */ - #define rcu_preempt_depth() (current->rcu_read_lock_nesting) -+#ifndef CONFIG_PREEMPT_RT_FULL -+#define sched_rcu_preempt_depth() rcu_preempt_depth() -+#else -+static inline int sched_rcu_preempt_depth(void) { return 0; } -+#endif - - #else /* #ifdef CONFIG_PREEMPT_RCU */ - -@@ -325,6 +334,8 @@ static inline int rcu_preempt_depth(void) - return 0; - } - -+#define sched_rcu_preempt_depth() rcu_preempt_depth() -+ - #endif /* #else #ifdef CONFIG_PREEMPT_RCU */ - - /* Internal to kernel */ -@@ -498,7 +509,14 @@ extern struct lockdep_map rcu_callback_map; - int debug_lockdep_rcu_enabled(void); - - int rcu_read_lock_held(void); -+#ifdef CONFIG_PREEMPT_RT_FULL -+static inline int rcu_read_lock_bh_held(void) -+{ -+ return rcu_read_lock_held(); -+} -+#else - int rcu_read_lock_bh_held(void); -+#endif - - /** - * rcu_read_lock_sched_held() - might we be in RCU-sched read-side critical section? -@@ -946,10 +964,14 @@ static inline void rcu_read_unlock(void) - static inline void rcu_read_lock_bh(void) - { - local_bh_disable(); -+#ifdef CONFIG_PREEMPT_RT_FULL -+ rcu_read_lock(); -+#else - __acquire(RCU_BH); - rcu_lock_acquire(&rcu_bh_lock_map); - RCU_LOCKDEP_WARN(!rcu_is_watching(), - "rcu_read_lock_bh() used illegally while idle"); -+#endif - } - - /* -@@ -959,10 +981,14 @@ static inline void rcu_read_lock_bh(void) - */ - static inline void rcu_read_unlock_bh(void) - { -+#ifdef CONFIG_PREEMPT_RT_FULL -+ rcu_read_unlock(); -+#else - RCU_LOCKDEP_WARN(!rcu_is_watching(), - "rcu_read_unlock_bh() used illegally while idle"); - rcu_lock_release(&rcu_bh_lock_map); - __release(RCU_BH); -+#endif - local_bh_enable(); - } - -diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h -index ad1eda9fa4da..732192c5da11 100644 ---- a/include/linux/rcutree.h -+++ b/include/linux/rcutree.h -@@ -44,7 +44,11 @@ static inline void rcu_virt_note_context_switch(int cpu) - rcu_note_context_switch(); - } - -+#ifdef CONFIG_PREEMPT_RT_FULL -+# define synchronize_rcu_bh synchronize_rcu -+#else - void synchronize_rcu_bh(void); -+#endif - void synchronize_sched_expedited(void); - void synchronize_rcu_expedited(void); - -@@ -72,7 +76,11 @@ static inline void synchronize_rcu_bh_expedited(void) - } - - void rcu_barrier(void); -+#ifdef CONFIG_PREEMPT_RT_FULL -+# define rcu_barrier_bh rcu_barrier -+#else - void rcu_barrier_bh(void); -+#endif - void rcu_barrier_sched(void); - unsigned long get_state_synchronize_rcu(void); - void cond_synchronize_rcu(unsigned long oldstate); -@@ -85,12 +93,10 @@ unsigned long rcu_batches_started(void); - unsigned long rcu_batches_started_bh(void); - unsigned long rcu_batches_started_sched(void); - unsigned long rcu_batches_completed(void); --unsigned long rcu_batches_completed_bh(void); - unsigned long rcu_batches_completed_sched(void); - void show_rcu_gp_kthreads(void); - - void rcu_force_quiescent_state(void); --void rcu_bh_force_quiescent_state(void); - void rcu_sched_force_quiescent_state(void); - - void rcu_idle_enter(void); -@@ -107,6 +113,14 @@ extern int rcu_scheduler_active __read_mostly; - - bool rcu_is_watching(void); - -+#ifndef CONFIG_PREEMPT_RT_FULL -+void rcu_bh_force_quiescent_state(void); -+unsigned long rcu_batches_completed_bh(void); -+#else -+# define rcu_bh_force_quiescent_state rcu_force_quiescent_state -+# define rcu_batches_completed_bh rcu_batches_completed -+#endif -+ - void rcu_all_qs(void); - - #endif /* __LINUX_RCUTREE_H */ -diff --git a/include/linux/rtmutex.h b/include/linux/rtmutex.h -index 1abba5ce2a2f..30211c627511 100644 ---- a/include/linux/rtmutex.h -+++ b/include/linux/rtmutex.h -@@ -13,11 +13,15 @@ - #define __LINUX_RT_MUTEX_H - - #include <linux/linkage.h> -+#include <linux/spinlock_types_raw.h> - #include <linux/rbtree.h> --#include <linux/spinlock_types.h> - - extern int max_lock_depth; /* for sysctl */ - -+#ifdef CONFIG_DEBUG_MUTEXES -+#include <linux/debug_locks.h> -+#endif -+ - /** - * The rt_mutex structure - * -@@ -31,8 +35,8 @@ struct rt_mutex { - struct rb_root waiters; - struct rb_node *waiters_leftmost; - struct task_struct *owner; --#ifdef CONFIG_DEBUG_RT_MUTEXES - int save_state; -+#ifdef CONFIG_DEBUG_RT_MUTEXES - const char *name, *file; - int line; - void *magic; -@@ -55,22 +59,33 @@ struct hrtimer_sleeper; - # define rt_mutex_debug_check_no_locks_held(task) do { } while (0) - #endif - -+# define rt_mutex_init(mutex) \ -+ do { \ -+ raw_spin_lock_init(&(mutex)->wait_lock); \ -+ __rt_mutex_init(mutex, #mutex); \ -+ } while (0) -+ - #ifdef CONFIG_DEBUG_RT_MUTEXES - # define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) \ - , .name = #mutexname, .file = __FILE__, .line = __LINE__ --# define rt_mutex_init(mutex) __rt_mutex_init(mutex, __func__) - extern void rt_mutex_debug_task_free(struct task_struct *tsk); - #else - # define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) --# define rt_mutex_init(mutex) __rt_mutex_init(mutex, NULL) - # define rt_mutex_debug_task_free(t) do { } while (0) - #endif - --#define __RT_MUTEX_INITIALIZER(mutexname) \ -- { .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \ -+#define __RT_MUTEX_INITIALIZER_PLAIN(mutexname) \ -+ .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \ - , .waiters = RB_ROOT \ - , .owner = NULL \ -- __DEBUG_RT_MUTEX_INITIALIZER(mutexname)} -+ __DEBUG_RT_MUTEX_INITIALIZER(mutexname) -+ -+#define __RT_MUTEX_INITIALIZER(mutexname) \ -+ { __RT_MUTEX_INITIALIZER_PLAIN(mutexname) } -+ -+#define __RT_MUTEX_INITIALIZER_SAVE_STATE(mutexname) \ -+ { __RT_MUTEX_INITIALIZER_PLAIN(mutexname) \ -+ , .save_state = 1 } - - #define DEFINE_RT_MUTEX(mutexname) \ - struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname) -@@ -91,6 +106,7 @@ extern void rt_mutex_destroy(struct rt_mutex *lock); - - extern void rt_mutex_lock(struct rt_mutex *lock); - extern int rt_mutex_lock_interruptible(struct rt_mutex *lock); -+extern int rt_mutex_lock_killable(struct rt_mutex *lock); - extern int rt_mutex_timed_lock(struct rt_mutex *lock, - struct hrtimer_sleeper *timeout); - -diff --git a/include/linux/rwlock_rt.h b/include/linux/rwlock_rt.h -new file mode 100644 -index 000000000000..49ed2d45d3be ---- /dev/null -+++ b/include/linux/rwlock_rt.h -@@ -0,0 +1,99 @@ -+#ifndef __LINUX_RWLOCK_RT_H -+#define __LINUX_RWLOCK_RT_H -+ -+#ifndef __LINUX_SPINLOCK_H -+#error Do not include directly. Use spinlock.h -+#endif -+ -+#define rwlock_init(rwl) \ -+do { \ -+ static struct lock_class_key __key; \ -+ \ -+ rt_mutex_init(&(rwl)->lock); \ -+ __rt_rwlock_init(rwl, #rwl, &__key); \ -+} while (0) -+ -+extern void __lockfunc rt_write_lock(rwlock_t *rwlock); -+extern void __lockfunc rt_read_lock(rwlock_t *rwlock); -+extern int __lockfunc rt_write_trylock(rwlock_t *rwlock); -+extern int __lockfunc rt_write_trylock_irqsave(rwlock_t *trylock, unsigned long *flags); -+extern int __lockfunc rt_read_trylock(rwlock_t *rwlock); -+extern void __lockfunc rt_write_unlock(rwlock_t *rwlock); -+extern void __lockfunc rt_read_unlock(rwlock_t *rwlock); -+extern unsigned long __lockfunc rt_write_lock_irqsave(rwlock_t *rwlock); -+extern unsigned long __lockfunc rt_read_lock_irqsave(rwlock_t *rwlock); -+extern void __rt_rwlock_init(rwlock_t *rwlock, char *name, struct lock_class_key *key); -+ -+#define read_trylock(lock) __cond_lock(lock, rt_read_trylock(lock)) -+#define write_trylock(lock) __cond_lock(lock, rt_write_trylock(lock)) -+ -+#define write_trylock_irqsave(lock, flags) \ -+ __cond_lock(lock, rt_write_trylock_irqsave(lock, &flags)) -+ -+#define read_lock_irqsave(lock, flags) \ -+ do { \ -+ typecheck(unsigned long, flags); \ -+ flags = rt_read_lock_irqsave(lock); \ -+ } while (0) -+ -+#define write_lock_irqsave(lock, flags) \ -+ do { \ -+ typecheck(unsigned long, flags); \ -+ flags = rt_write_lock_irqsave(lock); \ -+ } while (0) -+ -+#define read_lock(lock) rt_read_lock(lock) -+ -+#define read_lock_bh(lock) \ -+ do { \ -+ local_bh_disable(); \ -+ rt_read_lock(lock); \ -+ } while (0) -+ -+#define read_lock_irq(lock) read_lock(lock) -+ -+#define write_lock(lock) rt_write_lock(lock) -+ -+#define write_lock_bh(lock) \ -+ do { \ -+ local_bh_disable(); \ -+ rt_write_lock(lock); \ -+ } while (0) -+ -+#define write_lock_irq(lock) write_lock(lock) -+ -+#define read_unlock(lock) rt_read_unlock(lock) -+ -+#define read_unlock_bh(lock) \ -+ do { \ -+ rt_read_unlock(lock); \ -+ local_bh_enable(); \ -+ } while (0) -+ -+#define read_unlock_irq(lock) read_unlock(lock) -+ -+#define write_unlock(lock) rt_write_unlock(lock) -+ -+#define write_unlock_bh(lock) \ -+ do { \ -+ rt_write_unlock(lock); \ -+ local_bh_enable(); \ -+ } while (0) -+ -+#define write_unlock_irq(lock) write_unlock(lock) -+ -+#define read_unlock_irqrestore(lock, flags) \ -+ do { \ -+ typecheck(unsigned long, flags); \ -+ (void) flags; \ -+ rt_read_unlock(lock); \ -+ } while (0) -+ -+#define write_unlock_irqrestore(lock, flags) \ -+ do { \ -+ typecheck(unsigned long, flags); \ -+ (void) flags; \ -+ rt_write_unlock(lock); \ -+ } while (0) -+ -+#endif -diff --git a/include/linux/rwlock_types.h b/include/linux/rwlock_types.h -index cc0072e93e36..5317cd957292 100644 ---- a/include/linux/rwlock_types.h -+++ b/include/linux/rwlock_types.h -@@ -1,6 +1,10 @@ - #ifndef __LINUX_RWLOCK_TYPES_H - #define __LINUX_RWLOCK_TYPES_H - -+#if !defined(__LINUX_SPINLOCK_TYPES_H) -+# error "Do not include directly, include spinlock_types.h" -+#endif -+ - /* - * include/linux/rwlock_types.h - generic rwlock type definitions - * and initializers -diff --git a/include/linux/rwlock_types_rt.h b/include/linux/rwlock_types_rt.h -new file mode 100644 -index 000000000000..51b28d775fe1 ---- /dev/null -+++ b/include/linux/rwlock_types_rt.h -@@ -0,0 +1,33 @@ -+#ifndef __LINUX_RWLOCK_TYPES_RT_H -+#define __LINUX_RWLOCK_TYPES_RT_H -+ -+#ifndef __LINUX_SPINLOCK_TYPES_H -+#error "Do not include directly. Include spinlock_types.h instead" -+#endif -+ -+/* -+ * rwlocks - rtmutex which allows single reader recursion -+ */ -+typedef struct { -+ struct rt_mutex lock; -+ int read_depth; -+ unsigned int break_lock; -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+ struct lockdep_map dep_map; -+#endif -+} rwlock_t; -+ -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+# define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname } -+#else -+# define RW_DEP_MAP_INIT(lockname) -+#endif -+ -+#define __RW_LOCK_UNLOCKED(name) \ -+ { .lock = __RT_MUTEX_INITIALIZER_SAVE_STATE(name.lock), \ -+ RW_DEP_MAP_INIT(name) } -+ -+#define DEFINE_RWLOCK(name) \ -+ rwlock_t name = __RW_LOCK_UNLOCKED(name) -+ -+#endif -diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h -index 8f498cdde280..2b2148431f14 100644 ---- a/include/linux/rwsem.h -+++ b/include/linux/rwsem.h -@@ -18,6 +18,10 @@ - #include <linux/osq_lock.h> - #endif - -+#ifdef CONFIG_PREEMPT_RT_FULL -+#include <linux/rwsem_rt.h> -+#else /* PREEMPT_RT_FULL */ -+ - struct rw_semaphore; - - #ifdef CONFIG_RWSEM_GENERIC_SPINLOCK -@@ -177,4 +181,6 @@ extern void up_read_non_owner(struct rw_semaphore *sem); - # define up_read_non_owner(sem) up_read(sem) - #endif - -+#endif /* !PREEMPT_RT_FULL */ -+ - #endif /* _LINUX_RWSEM_H */ -diff --git a/include/linux/rwsem_rt.h b/include/linux/rwsem_rt.h -new file mode 100644 -index 000000000000..f97860b2e2a4 ---- /dev/null -+++ b/include/linux/rwsem_rt.h -@@ -0,0 +1,152 @@ -+#ifndef _LINUX_RWSEM_RT_H -+#define _LINUX_RWSEM_RT_H -+ -+#ifndef _LINUX_RWSEM_H -+#error "Include rwsem.h" -+#endif -+ -+/* -+ * RW-semaphores are a spinlock plus a reader-depth count. -+ * -+ * Note that the semantics are different from the usual -+ * Linux rw-sems, in PREEMPT_RT mode we do not allow -+ * multiple readers to hold the lock at once, we only allow -+ * a read-lock owner to read-lock recursively. This is -+ * better for latency, makes the implementation inherently -+ * fair and makes it simpler as well. -+ */ -+ -+#include <linux/rtmutex.h> -+ -+struct rw_semaphore { -+ struct rt_mutex lock; -+ int read_depth; -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+ struct lockdep_map dep_map; -+#endif -+}; -+ -+#define __RWSEM_INITIALIZER(name) \ -+ { .lock = __RT_MUTEX_INITIALIZER(name.lock), \ -+ RW_DEP_MAP_INIT(name) } -+ -+#define DECLARE_RWSEM(lockname) \ -+ struct rw_semaphore lockname = __RWSEM_INITIALIZER(lockname) -+ -+extern void __rt_rwsem_init(struct rw_semaphore *rwsem, const char *name, -+ struct lock_class_key *key); -+ -+#define __rt_init_rwsem(sem, name, key) \ -+ do { \ -+ rt_mutex_init(&(sem)->lock); \ -+ __rt_rwsem_init((sem), (name), (key));\ -+ } while (0) -+ -+#define __init_rwsem(sem, name, key) __rt_init_rwsem(sem, name, key) -+ -+# define rt_init_rwsem(sem) \ -+do { \ -+ static struct lock_class_key __key; \ -+ \ -+ __rt_init_rwsem((sem), #sem, &__key); \ -+} while (0) -+ -+extern void rt_down_write(struct rw_semaphore *rwsem); -+extern void rt_down_read_nested(struct rw_semaphore *rwsem, int subclass); -+extern void rt_down_write_nested(struct rw_semaphore *rwsem, int subclass); -+extern void rt_down_write_nested_lock(struct rw_semaphore *rwsem, -+ struct lockdep_map *nest); -+extern void rt__down_read(struct rw_semaphore *rwsem); -+extern void rt_down_read(struct rw_semaphore *rwsem); -+extern int rt_down_write_trylock(struct rw_semaphore *rwsem); -+extern int rt__down_read_trylock(struct rw_semaphore *rwsem); -+extern int rt_down_read_trylock(struct rw_semaphore *rwsem); -+extern void __rt_up_read(struct rw_semaphore *rwsem); -+extern void rt_up_read(struct rw_semaphore *rwsem); -+extern void rt_up_write(struct rw_semaphore *rwsem); -+extern void rt_downgrade_write(struct rw_semaphore *rwsem); -+ -+#define init_rwsem(sem) rt_init_rwsem(sem) -+#define rwsem_is_locked(s) rt_mutex_is_locked(&(s)->lock) -+ -+static inline int rwsem_is_contended(struct rw_semaphore *sem) -+{ -+ /* rt_mutex_has_waiters() */ -+ return !RB_EMPTY_ROOT(&sem->lock.waiters); -+} -+ -+static inline void __down_read(struct rw_semaphore *sem) -+{ -+ rt__down_read(sem); -+} -+ -+static inline void down_read(struct rw_semaphore *sem) -+{ -+ rt_down_read(sem); -+} -+ -+static inline int __down_read_trylock(struct rw_semaphore *sem) -+{ -+ return rt__down_read_trylock(sem); -+} -+ -+static inline int down_read_trylock(struct rw_semaphore *sem) -+{ -+ return rt_down_read_trylock(sem); -+} -+ -+static inline void down_write(struct rw_semaphore *sem) -+{ -+ rt_down_write(sem); -+} -+ -+static inline int down_write_trylock(struct rw_semaphore *sem) -+{ -+ return rt_down_write_trylock(sem); -+} -+ -+static inline void __up_read(struct rw_semaphore *sem) -+{ -+ __rt_up_read(sem); -+} -+ -+static inline void up_read(struct rw_semaphore *sem) -+{ -+ rt_up_read(sem); -+} -+ -+static inline void up_write(struct rw_semaphore *sem) -+{ -+ rt_up_write(sem); -+} -+ -+static inline void downgrade_write(struct rw_semaphore *sem) -+{ -+ rt_downgrade_write(sem); -+} -+ -+static inline void down_read_nested(struct rw_semaphore *sem, int subclass) -+{ -+ return rt_down_read_nested(sem, subclass); -+} -+ -+static inline void down_write_nested(struct rw_semaphore *sem, int subclass) -+{ -+ rt_down_write_nested(sem, subclass); -+} -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+static inline void down_write_nest_lock(struct rw_semaphore *sem, -+ struct rw_semaphore *nest_lock) -+{ -+ rt_down_write_nested_lock(sem, &nest_lock->dep_map); -+} -+ -+#else -+ -+static inline void down_write_nest_lock(struct rw_semaphore *sem, -+ struct rw_semaphore *nest_lock) -+{ -+ rt_down_write_nested_lock(sem, NULL); -+} -+#endif -+#endif -diff --git a/include/linux/sched.h b/include/linux/sched.h -index 52c4847b05e2..c242cbd84485 100644 ---- a/include/linux/sched.h -+++ b/include/linux/sched.h -@@ -26,6 +26,7 @@ struct sched_param { - #include <linux/nodemask.h> - #include <linux/mm_types.h> - #include <linux/preempt.h> -+#include <asm/kmap_types.h> - - #include <asm/page.h> - #include <asm/ptrace.h> -@@ -241,10 +242,7 @@ extern char ___assert_task_state[1 - 2*!!( - TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ - __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD) - --#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) - #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) --#define task_is_stopped_or_traced(task) \ -- ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) - #define task_contributes_to_load(task) \ - ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ - (task->flags & PF_FROZEN) == 0 && \ -@@ -310,6 +308,11 @@ extern char ___assert_task_state[1 - 2*!!( - - #endif - -+#define __set_current_state_no_track(state_value) \ -+ do { current->state = (state_value); } while (0) -+#define set_current_state_no_track(state_value) \ -+ set_mb(current->state, (state_value)) -+ - /* Task command name length */ - #define TASK_COMM_LEN 16 - -@@ -981,8 +984,18 @@ struct wake_q_head { - struct wake_q_head name = { WAKE_Q_TAIL, &name.first } - - extern void wake_q_add(struct wake_q_head *head, -- struct task_struct *task); --extern void wake_up_q(struct wake_q_head *head); -+ struct task_struct *task); -+extern void __wake_up_q(struct wake_q_head *head, bool sleeper); -+ -+static inline void wake_up_q(struct wake_q_head *head) -+{ -+ __wake_up_q(head, false); -+} -+ -+static inline void wake_up_q_sleeper(struct wake_q_head *head) -+{ -+ __wake_up_q(head, true); -+} - - /* - * sched-domains (multiprocessor balancing) declarations: -@@ -1393,6 +1406,7 @@ struct tlbflush_unmap_batch { - - struct task_struct { - volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ -+ volatile long saved_state; /* saved state for "spinlock sleepers" */ - void *stack; - atomic_t usage; - unsigned int flags; /* per process flags, defined below */ -@@ -1429,6 +1443,12 @@ struct task_struct { - #endif - - unsigned int policy; -+#ifdef CONFIG_PREEMPT_RT_FULL -+ int migrate_disable; -+# ifdef CONFIG_SCHED_DEBUG -+ int migrate_disable_atomic; -+# endif -+#endif - int nr_cpus_allowed; - cpumask_t cpus_allowed; - -@@ -1559,6 +1579,9 @@ struct task_struct { - - struct task_cputime cputime_expires; - struct list_head cpu_timers[3]; -+#ifdef CONFIG_PREEMPT_RT_BASE -+ struct task_struct *posix_timer_list; -+#endif - - /* process credentials */ - const struct cred __rcu *real_cred; /* objective and real subjective task -@@ -1589,10 +1612,15 @@ struct task_struct { - /* signal handlers */ - struct signal_struct *signal; - struct sighand_struct *sighand; -+ struct sigqueue *sigqueue_cache; - - sigset_t blocked, real_blocked; - sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ - struct sigpending pending; -+#ifdef CONFIG_PREEMPT_RT_FULL -+ /* TODO: move me into ->restart_block ? */ -+ struct siginfo forced_info; -+#endif - - unsigned long sas_ss_sp; - size_t sas_ss_size; -@@ -1820,6 +1848,12 @@ struct task_struct { - /* bitmask and counter of trace recursion */ - unsigned long trace_recursion; - #endif /* CONFIG_TRACING */ -+#ifdef CONFIG_WAKEUP_LATENCY_HIST -+ u64 preempt_timestamp_hist; -+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST -+ long timer_offset; -+#endif -+#endif - #ifdef CONFIG_KCOV - /* Coverage collection mode enabled for this task (0 if disabled). */ - enum kcov_mode kcov_mode; -@@ -1845,9 +1879,23 @@ struct task_struct { - unsigned int sequential_io; - unsigned int sequential_io_avg; - #endif -+#ifdef CONFIG_PREEMPT_RT_BASE -+ struct rcu_head put_rcu; -+ int softirq_nestcnt; -+ unsigned int softirqs_raised; -+#endif -+#ifdef CONFIG_PREEMPT_RT_FULL -+# if defined CONFIG_HIGHMEM || defined CONFIG_X86_32 -+ int kmap_idx; -+ pte_t kmap_pte[KM_TYPE_NR]; -+# endif -+#endif - #ifdef CONFIG_DEBUG_ATOMIC_SLEEP - unsigned long task_state_change; - #endif -+#ifdef CONFIG_PREEMPT_RT_FULL -+ int xmit_recursion; -+#endif - int pagefault_disabled; - #ifdef CONFIG_MMU - struct task_struct *oom_reaper_list; -@@ -1868,9 +1916,6 @@ extern int arch_task_struct_size __read_mostly; - # define arch_task_struct_size (sizeof(struct task_struct)) - #endif - --/* Future-safe accessor for struct task_struct's cpus_allowed. */ --#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) -- - #define TNF_MIGRATED 0x01 - #define TNF_NO_GROUP 0x02 - #define TNF_SHARED 0x04 -@@ -2060,6 +2105,15 @@ extern struct pid *cad_pid; - extern void free_task(struct task_struct *tsk); - #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) - -+#ifdef CONFIG_PREEMPT_RT_BASE -+extern void __put_task_struct_cb(struct rcu_head *rhp); -+ -+static inline void put_task_struct(struct task_struct *t) -+{ -+ if (atomic_dec_and_test(&t->usage)) -+ call_rcu(&t->put_rcu, __put_task_struct_cb); -+} -+#else - extern void __put_task_struct(struct task_struct *t); - - static inline void put_task_struct(struct task_struct *t) -@@ -2067,6 +2121,7 @@ static inline void put_task_struct(struct task_struct *t) - if (atomic_dec_and_test(&t->usage)) - __put_task_struct(t); - } -+#endif - - #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN - extern void task_cputime(struct task_struct *t, -@@ -2105,6 +2160,7 @@ extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, - /* - * Per process flags - */ -+#define PF_IN_SOFTIRQ 0x00000001 /* Task is serving softirq */ - #define PF_EXITING 0x00000004 /* getting shut down */ - #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ - #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ -@@ -2269,6 +2325,10 @@ extern void do_set_cpus_allowed(struct task_struct *p, - - extern int set_cpus_allowed_ptr(struct task_struct *p, - const struct cpumask *new_mask); -+int migrate_me(void); -+void tell_sched_cpu_down_begin(int cpu); -+void tell_sched_cpu_down_done(int cpu); -+ - #else - static inline void do_set_cpus_allowed(struct task_struct *p, - const struct cpumask *new_mask) -@@ -2281,6 +2341,9 @@ static inline int set_cpus_allowed_ptr(struct task_struct *p, - return -EINVAL; - return 0; - } -+static inline int migrate_me(void) { return 0; } -+static inline void tell_sched_cpu_down_begin(int cpu) { } -+static inline void tell_sched_cpu_down_done(int cpu) { } - #endif - - #ifdef CONFIG_NO_HZ_COMMON -@@ -2487,6 +2550,7 @@ extern void xtime_update(unsigned long ticks); - - extern int wake_up_state(struct task_struct *tsk, unsigned int state); - extern int wake_up_process(struct task_struct *tsk); -+extern int wake_up_lock_sleeper(struct task_struct * tsk); - extern void wake_up_new_task(struct task_struct *tsk); - #ifdef CONFIG_SMP - extern void kick_process(struct task_struct *tsk); -@@ -2610,12 +2674,24 @@ extern struct mm_struct * mm_alloc(void); - - /* mmdrop drops the mm and the page tables */ - extern void __mmdrop(struct mm_struct *); -+ - static inline void mmdrop(struct mm_struct * mm) - { - if (unlikely(atomic_dec_and_test(&mm->mm_count))) - __mmdrop(mm); - } - -+#ifdef CONFIG_PREEMPT_RT_BASE -+extern void __mmdrop_delayed(struct rcu_head *rhp); -+static inline void mmdrop_delayed(struct mm_struct *mm) -+{ -+ if (atomic_dec_and_test(&mm->mm_count)) -+ call_rcu(&mm->delayed_drop, __mmdrop_delayed); -+} -+#else -+# define mmdrop_delayed(mm) mmdrop(mm) -+#endif -+ - /* mmput gets rid of the mappings and all user-space */ - extern void mmput(struct mm_struct *); - /* Grab a reference to a task's mm, if it is not already going away */ -@@ -2933,6 +3009,43 @@ static inline int test_tsk_need_resched(struct task_struct *tsk) - return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); - } - -+#ifdef CONFIG_PREEMPT_LAZY -+static inline void set_tsk_need_resched_lazy(struct task_struct *tsk) -+{ -+ set_tsk_thread_flag(tsk,TIF_NEED_RESCHED_LAZY); -+} -+ -+static inline void clear_tsk_need_resched_lazy(struct task_struct *tsk) -+{ -+ clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED_LAZY); -+} -+ -+static inline int test_tsk_need_resched_lazy(struct task_struct *tsk) -+{ -+ return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED_LAZY)); -+} -+ -+static inline int need_resched_lazy(void) -+{ -+ return test_thread_flag(TIF_NEED_RESCHED_LAZY); -+} -+ -+static inline int need_resched_now(void) -+{ -+ return test_thread_flag(TIF_NEED_RESCHED); -+} -+ -+#else -+static inline void clear_tsk_need_resched_lazy(struct task_struct *tsk) { } -+static inline int need_resched_lazy(void) { return 0; } -+ -+static inline int need_resched_now(void) -+{ -+ return test_thread_flag(TIF_NEED_RESCHED); -+} -+ -+#endif -+ - static inline int restart_syscall(void) - { - set_tsk_thread_flag(current, TIF_SIGPENDING); -@@ -2964,6 +3077,51 @@ static inline int signal_pending_state(long state, struct task_struct *p) - return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); - } - -+static inline bool __task_is_stopped_or_traced(struct task_struct *task) -+{ -+ if (task->state & (__TASK_STOPPED | __TASK_TRACED)) -+ return true; -+#ifdef CONFIG_PREEMPT_RT_FULL -+ if (task->saved_state & (__TASK_STOPPED | __TASK_TRACED)) -+ return true; -+#endif -+ return false; -+} -+ -+static inline bool task_is_stopped_or_traced(struct task_struct *task) -+{ -+ bool traced_stopped; -+ -+#ifdef CONFIG_PREEMPT_RT_FULL -+ unsigned long flags; -+ -+ raw_spin_lock_irqsave(&task->pi_lock, flags); -+ traced_stopped = __task_is_stopped_or_traced(task); -+ raw_spin_unlock_irqrestore(&task->pi_lock, flags); -+#else -+ traced_stopped = __task_is_stopped_or_traced(task); -+#endif -+ return traced_stopped; -+} -+ -+static inline bool task_is_traced(struct task_struct *task) -+{ -+ bool traced = false; -+ -+ if (task->state & __TASK_TRACED) -+ return true; -+#ifdef CONFIG_PREEMPT_RT_FULL -+ /* in case the task is sleeping on tasklist_lock */ -+ raw_spin_lock_irq(&task->pi_lock); -+ if (task->state & __TASK_TRACED) -+ traced = true; -+ else if (task->saved_state & __TASK_TRACED) -+ traced = true; -+ raw_spin_unlock_irq(&task->pi_lock); -+#endif -+ return traced; -+} -+ - /* - * cond_resched() and cond_resched_lock(): latency reduction via - * explicit rescheduling in places that are safe. The return -@@ -2985,12 +3143,16 @@ extern int __cond_resched_lock(spinlock_t *lock); - __cond_resched_lock(lock); \ - }) - -+#ifndef CONFIG_PREEMPT_RT_FULL - extern int __cond_resched_softirq(void); - - #define cond_resched_softirq() ({ \ - ___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ - __cond_resched_softirq(); \ - }) -+#else -+# define cond_resched_softirq() cond_resched() -+#endif - - static inline void cond_resched_rcu(void) - { -@@ -3152,6 +3314,31 @@ static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) - - #endif /* CONFIG_SMP */ - -+static inline int __migrate_disabled(struct task_struct *p) -+{ -+#ifdef CONFIG_PREEMPT_RT_FULL -+ return p->migrate_disable; -+#else -+ return 0; -+#endif -+} -+ -+/* Future-safe accessor for struct task_struct's cpus_allowed. */ -+static inline const struct cpumask *tsk_cpus_allowed(struct task_struct *p) -+{ -+ if (__migrate_disabled(p)) -+ return cpumask_of(task_cpu(p)); -+ -+ return &p->cpus_allowed; -+} -+ -+static inline int tsk_nr_cpus_allowed(struct task_struct *p) -+{ -+ if (__migrate_disabled(p)) -+ return 1; -+ return p->nr_cpus_allowed; -+} -+ - extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); - extern long sched_getaffinity(pid_t pid, struct cpumask *mask); - -diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h -index e0582106ef4f..b14f4d2368aa 100644 ---- a/include/linux/seqlock.h -+++ b/include/linux/seqlock.h -@@ -220,20 +220,30 @@ static inline int read_seqcount_retry(const seqcount_t *s, unsigned start) - return __read_seqcount_retry(s, start); - } - -- -- --static inline void raw_write_seqcount_begin(seqcount_t *s) -+static inline void __raw_write_seqcount_begin(seqcount_t *s) - { - s->sequence++; - smp_wmb(); - } - --static inline void raw_write_seqcount_end(seqcount_t *s) -+static inline void raw_write_seqcount_begin(seqcount_t *s) -+{ -+ preempt_disable_rt(); -+ __raw_write_seqcount_begin(s); -+} -+ -+static inline void __raw_write_seqcount_end(seqcount_t *s) - { - smp_wmb(); - s->sequence++; - } - -+static inline void raw_write_seqcount_end(seqcount_t *s) -+{ -+ __raw_write_seqcount_end(s); -+ preempt_enable_rt(); -+} -+ - /** - * raw_write_seqcount_barrier - do a seq write barrier - * @s: pointer to seqcount_t -@@ -425,10 +435,32 @@ typedef struct { - /* - * Read side functions for starting and finalizing a read side section. - */ -+#ifndef CONFIG_PREEMPT_RT_FULL - static inline unsigned read_seqbegin(const seqlock_t *sl) - { - return read_seqcount_begin(&sl->seqcount); - } -+#else -+/* -+ * Starvation safe read side for RT -+ */ -+static inline unsigned read_seqbegin(seqlock_t *sl) -+{ -+ unsigned ret; -+ -+repeat: -+ ret = ACCESS_ONCE(sl->seqcount.sequence); -+ if (unlikely(ret & 1)) { -+ /* -+ * Take the lock and let the writer proceed (i.e. evtl -+ * boost it), otherwise we could loop here forever. -+ */ -+ spin_unlock_wait(&sl->lock); -+ goto repeat; -+ } -+ return ret; -+} -+#endif - - static inline unsigned read_seqretry(const seqlock_t *sl, unsigned start) - { -@@ -443,36 +475,36 @@ static inline unsigned read_seqretry(const seqlock_t *sl, unsigned start) - static inline void write_seqlock(seqlock_t *sl) - { - spin_lock(&sl->lock); -- write_seqcount_begin(&sl->seqcount); -+ __raw_write_seqcount_begin(&sl->seqcount); - } - - static inline void write_sequnlock(seqlock_t *sl) - { -- write_seqcount_end(&sl->seqcount); -+ __raw_write_seqcount_end(&sl->seqcount); - spin_unlock(&sl->lock); - } - - static inline void write_seqlock_bh(seqlock_t *sl) - { - spin_lock_bh(&sl->lock); -- write_seqcount_begin(&sl->seqcount); -+ __raw_write_seqcount_begin(&sl->seqcount); - } - - static inline void write_sequnlock_bh(seqlock_t *sl) - { -- write_seqcount_end(&sl->seqcount); -+ __raw_write_seqcount_end(&sl->seqcount); - spin_unlock_bh(&sl->lock); - } - - static inline void write_seqlock_irq(seqlock_t *sl) - { - spin_lock_irq(&sl->lock); -- write_seqcount_begin(&sl->seqcount); -+ __raw_write_seqcount_begin(&sl->seqcount); - } - - static inline void write_sequnlock_irq(seqlock_t *sl) - { -- write_seqcount_end(&sl->seqcount); -+ __raw_write_seqcount_end(&sl->seqcount); - spin_unlock_irq(&sl->lock); - } - -@@ -481,7 +513,7 @@ static inline unsigned long __write_seqlock_irqsave(seqlock_t *sl) - unsigned long flags; - - spin_lock_irqsave(&sl->lock, flags); -- write_seqcount_begin(&sl->seqcount); -+ __raw_write_seqcount_begin(&sl->seqcount); - return flags; - } - -@@ -491,7 +523,7 @@ static inline unsigned long __write_seqlock_irqsave(seqlock_t *sl) - static inline void - write_sequnlock_irqrestore(seqlock_t *sl, unsigned long flags) - { -- write_seqcount_end(&sl->seqcount); -+ __raw_write_seqcount_end(&sl->seqcount); - spin_unlock_irqrestore(&sl->lock, flags); - } - -diff --git a/include/linux/signal.h b/include/linux/signal.h -index d80259afb9e5..ddd1e6866a54 100644 ---- a/include/linux/signal.h -+++ b/include/linux/signal.h -@@ -233,6 +233,7 @@ static inline void init_sigpending(struct sigpending *sig) - } - - extern void flush_sigqueue(struct sigpending *queue); -+extern void flush_task_sigqueue(struct task_struct *tsk); - - /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */ - static inline int valid_signal(unsigned long sig) -diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h -index 794b924e9669..db2af7c88a6a 100644 ---- a/include/linux/skbuff.h -+++ b/include/linux/skbuff.h -@@ -283,6 +283,7 @@ struct sk_buff_head { - - __u32 qlen; - spinlock_t lock; -+ raw_spinlock_t raw_lock; - }; - - struct sk_buff; -@@ -1538,6 +1539,12 @@ static inline void skb_queue_head_init(struct sk_buff_head *list) - __skb_queue_head_init(list); - } - -+static inline void skb_queue_head_init_raw(struct sk_buff_head *list) -+{ -+ raw_spin_lock_init(&list->raw_lock); -+ __skb_queue_head_init(list); -+} -+ - static inline void skb_queue_head_init_class(struct sk_buff_head *list, - struct lock_class_key *class) - { -diff --git a/include/linux/smp.h b/include/linux/smp.h -index c4414074bd88..e6ab36aeaaab 100644 ---- a/include/linux/smp.h -+++ b/include/linux/smp.h -@@ -185,6 +185,9 @@ static inline void smp_init(void) { } - #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) - #define put_cpu() preempt_enable() - -+#define get_cpu_light() ({ migrate_disable(); smp_processor_id(); }) -+#define put_cpu_light() migrate_enable() -+ - /* - * Callback to arch code if there's nosmp or maxcpus=0 on the - * boot command line: -diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h -index 47dd0cebd204..b241cc044bd3 100644 ---- a/include/linux/spinlock.h -+++ b/include/linux/spinlock.h -@@ -271,7 +271,11 @@ static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock) - #define raw_spin_can_lock(lock) (!raw_spin_is_locked(lock)) - - /* Include rwlock functions */ --#include <linux/rwlock.h> -+#ifdef CONFIG_PREEMPT_RT_FULL -+# include <linux/rwlock_rt.h> -+#else -+# include <linux/rwlock.h> -+#endif - - /* - * Pull the _spin_*()/_read_*()/_write_*() functions/declarations: -@@ -282,6 +286,10 @@ static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock) - # include <linux/spinlock_api_up.h> - #endif - -+#ifdef CONFIG_PREEMPT_RT_FULL -+# include <linux/spinlock_rt.h> -+#else /* PREEMPT_RT_FULL */ -+ - /* - * Map the spin_lock functions to the raw variants for PREEMPT_RT=n - */ -@@ -416,4 +424,6 @@ extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock); - #define atomic_dec_and_lock(atomic, lock) \ - __cond_lock(lock, _atomic_dec_and_lock(atomic, lock)) - -+#endif /* !PREEMPT_RT_FULL */ -+ - #endif /* __LINUX_SPINLOCK_H */ -diff --git a/include/linux/spinlock_api_smp.h b/include/linux/spinlock_api_smp.h -index 5344268e6e62..043263f30e81 100644 ---- a/include/linux/spinlock_api_smp.h -+++ b/include/linux/spinlock_api_smp.h -@@ -189,6 +189,8 @@ static inline int __raw_spin_trylock_bh(raw_spinlock_t *lock) - return 0; - } - --#include <linux/rwlock_api_smp.h> -+#ifndef CONFIG_PREEMPT_RT_FULL -+# include <linux/rwlock_api_smp.h> -+#endif - - #endif /* __LINUX_SPINLOCK_API_SMP_H */ -diff --git a/include/linux/spinlock_rt.h b/include/linux/spinlock_rt.h -new file mode 100644 -index 000000000000..3b2825537531 ---- /dev/null -+++ b/include/linux/spinlock_rt.h -@@ -0,0 +1,163 @@ -+#ifndef __LINUX_SPINLOCK_RT_H -+#define __LINUX_SPINLOCK_RT_H -+ -+#ifndef __LINUX_SPINLOCK_H -+#error Do not include directly. Use spinlock.h -+#endif -+ -+#include <linux/bug.h> -+ -+extern void -+__rt_spin_lock_init(spinlock_t *lock, char *name, struct lock_class_key *key); -+ -+#define spin_lock_init(slock) \ -+do { \ -+ static struct lock_class_key __key; \ -+ \ -+ rt_mutex_init(&(slock)->lock); \ -+ __rt_spin_lock_init(slock, #slock, &__key); \ -+} while (0) -+ -+void __lockfunc rt_spin_lock__no_mg(spinlock_t *lock); -+void __lockfunc rt_spin_unlock__no_mg(spinlock_t *lock); -+int __lockfunc rt_spin_trylock__no_mg(spinlock_t *lock); -+ -+extern void __lockfunc rt_spin_lock(spinlock_t *lock); -+extern unsigned long __lockfunc rt_spin_lock_trace_flags(spinlock_t *lock); -+extern void __lockfunc rt_spin_lock_nested(spinlock_t *lock, int subclass); -+extern void __lockfunc rt_spin_unlock(spinlock_t *lock); -+extern void __lockfunc rt_spin_unlock_wait(spinlock_t *lock); -+extern int __lockfunc rt_spin_trylock_irqsave(spinlock_t *lock, unsigned long *flags); -+extern int __lockfunc rt_spin_trylock_bh(spinlock_t *lock); -+extern int __lockfunc rt_spin_trylock(spinlock_t *lock); -+extern int atomic_dec_and_spin_lock(atomic_t *atomic, spinlock_t *lock); -+ -+/* -+ * lockdep-less calls, for derived types like rwlock: -+ * (for trylock they can use rt_mutex_trylock() directly. -+ */ -+extern void __lockfunc __rt_spin_lock__no_mg(struct rt_mutex *lock); -+extern void __lockfunc __rt_spin_lock(struct rt_mutex *lock); -+extern void __lockfunc __rt_spin_unlock(struct rt_mutex *lock); -+extern int __lockfunc __rt_spin_trylock(struct rt_mutex *lock); -+ -+#define spin_lock(lock) rt_spin_lock(lock) -+ -+#define spin_lock_bh(lock) \ -+ do { \ -+ local_bh_disable(); \ -+ rt_spin_lock(lock); \ -+ } while (0) -+ -+#define spin_lock_irq(lock) spin_lock(lock) -+ -+#define spin_do_trylock(lock) __cond_lock(lock, rt_spin_trylock(lock)) -+ -+#define spin_trylock(lock) \ -+({ \ -+ int __locked; \ -+ __locked = spin_do_trylock(lock); \ -+ __locked; \ -+}) -+ -+#ifdef CONFIG_LOCKDEP -+# define spin_lock_nested(lock, subclass) \ -+ do { \ -+ rt_spin_lock_nested(lock, subclass); \ -+ } while (0) -+ -+#define spin_lock_bh_nested(lock, subclass) \ -+ do { \ -+ local_bh_disable(); \ -+ rt_spin_lock_nested(lock, subclass); \ -+ } while (0) -+ -+# define spin_lock_irqsave_nested(lock, flags, subclass) \ -+ do { \ -+ typecheck(unsigned long, flags); \ -+ flags = 0; \ -+ rt_spin_lock_nested(lock, subclass); \ -+ } while (0) -+#else -+# define spin_lock_nested(lock, subclass) spin_lock(lock) -+# define spin_lock_bh_nested(lock, subclass) spin_lock_bh(lock) -+ -+# define spin_lock_irqsave_nested(lock, flags, subclass) \ -+ do { \ -+ typecheck(unsigned long, flags); \ -+ flags = 0; \ -+ spin_lock(lock); \ -+ } while (0) -+#endif -+ -+#define spin_lock_irqsave(lock, flags) \ -+ do { \ -+ typecheck(unsigned long, flags); \ -+ flags = 0; \ -+ spin_lock(lock); \ -+ } while (0) -+ -+static inline unsigned long spin_lock_trace_flags(spinlock_t *lock) -+{ -+ unsigned long flags = 0; -+#ifdef CONFIG_TRACE_IRQFLAGS -+ flags = rt_spin_lock_trace_flags(lock); -+#else -+ spin_lock(lock); /* lock_local */ -+#endif -+ return flags; -+} -+ -+/* FIXME: we need rt_spin_lock_nest_lock */ -+#define spin_lock_nest_lock(lock, nest_lock) spin_lock_nested(lock, 0) -+ -+#define spin_unlock(lock) rt_spin_unlock(lock) -+ -+#define spin_unlock_bh(lock) \ -+ do { \ -+ rt_spin_unlock(lock); \ -+ local_bh_enable(); \ -+ } while (0) -+ -+#define spin_unlock_irq(lock) spin_unlock(lock) -+ -+#define spin_unlock_irqrestore(lock, flags) \ -+ do { \ -+ typecheck(unsigned long, flags); \ -+ (void) flags; \ -+ spin_unlock(lock); \ -+ } while (0) -+ -+#define spin_trylock_bh(lock) __cond_lock(lock, rt_spin_trylock_bh(lock)) -+#define spin_trylock_irq(lock) spin_trylock(lock) -+ -+#define spin_trylock_irqsave(lock, flags) \ -+ rt_spin_trylock_irqsave(lock, &(flags)) -+ -+#define spin_unlock_wait(lock) rt_spin_unlock_wait(lock) -+ -+#ifdef CONFIG_GENERIC_LOCKBREAK -+# define spin_is_contended(lock) ((lock)->break_lock) -+#else -+# define spin_is_contended(lock) (((void)(lock), 0)) -+#endif -+ -+static inline int spin_can_lock(spinlock_t *lock) -+{ -+ return !rt_mutex_is_locked(&lock->lock); -+} -+ -+static inline int spin_is_locked(spinlock_t *lock) -+{ -+ return rt_mutex_is_locked(&lock->lock); -+} -+ -+static inline void assert_spin_locked(spinlock_t *lock) -+{ -+ BUG_ON(!spin_is_locked(lock)); -+} -+ -+#define atomic_dec_and_lock(atomic, lock) \ -+ atomic_dec_and_spin_lock(atomic, lock) -+ -+#endif -diff --git a/include/linux/spinlock_types.h b/include/linux/spinlock_types.h -index 73548eb13a5d..10bac715ea96 100644 ---- a/include/linux/spinlock_types.h -+++ b/include/linux/spinlock_types.h -@@ -9,80 +9,15 @@ - * Released under the General Public License (GPL). - */ - --#if defined(CONFIG_SMP) --# include <asm/spinlock_types.h> -+#include <linux/spinlock_types_raw.h> -+ -+#ifndef CONFIG_PREEMPT_RT_FULL -+# include <linux/spinlock_types_nort.h> -+# include <linux/rwlock_types.h> - #else --# include <linux/spinlock_types_up.h> -+# include <linux/rtmutex.h> -+# include <linux/spinlock_types_rt.h> -+# include <linux/rwlock_types_rt.h> - #endif - --#include <linux/lockdep.h> -- --typedef struct raw_spinlock { -- arch_spinlock_t raw_lock; --#ifdef CONFIG_GENERIC_LOCKBREAK -- unsigned int break_lock; --#endif --#ifdef CONFIG_DEBUG_SPINLOCK -- unsigned int magic, owner_cpu; -- void *owner; --#endif --#ifdef CONFIG_DEBUG_LOCK_ALLOC -- struct lockdep_map dep_map; --#endif --} raw_spinlock_t; -- --#define SPINLOCK_MAGIC 0xdead4ead -- --#define SPINLOCK_OWNER_INIT ((void *)-1L) -- --#ifdef CONFIG_DEBUG_LOCK_ALLOC --# define SPIN_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname } --#else --# define SPIN_DEP_MAP_INIT(lockname) --#endif -- --#ifdef CONFIG_DEBUG_SPINLOCK --# define SPIN_DEBUG_INIT(lockname) \ -- .magic = SPINLOCK_MAGIC, \ -- .owner_cpu = -1, \ -- .owner = SPINLOCK_OWNER_INIT, --#else --# define SPIN_DEBUG_INIT(lockname) --#endif -- --#define __RAW_SPIN_LOCK_INITIALIZER(lockname) \ -- { \ -- .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED, \ -- SPIN_DEBUG_INIT(lockname) \ -- SPIN_DEP_MAP_INIT(lockname) } -- --#define __RAW_SPIN_LOCK_UNLOCKED(lockname) \ -- (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname) -- --#define DEFINE_RAW_SPINLOCK(x) raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x) -- --typedef struct spinlock { -- union { -- struct raw_spinlock rlock; -- --#ifdef CONFIG_DEBUG_LOCK_ALLOC --# define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map)) -- struct { -- u8 __padding[LOCK_PADSIZE]; -- struct lockdep_map dep_map; -- }; --#endif -- }; --} spinlock_t; -- --#define __SPIN_LOCK_INITIALIZER(lockname) \ -- { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } } -- --#define __SPIN_LOCK_UNLOCKED(lockname) \ -- (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname) -- --#define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x) -- --#include <linux/rwlock_types.h> -- - #endif /* __LINUX_SPINLOCK_TYPES_H */ -diff --git a/include/linux/spinlock_types_nort.h b/include/linux/spinlock_types_nort.h -new file mode 100644 -index 000000000000..f1dac1fb1d6a ---- /dev/null -+++ b/include/linux/spinlock_types_nort.h -@@ -0,0 +1,33 @@ -+#ifndef __LINUX_SPINLOCK_TYPES_NORT_H -+#define __LINUX_SPINLOCK_TYPES_NORT_H -+ -+#ifndef __LINUX_SPINLOCK_TYPES_H -+#error "Do not include directly. Include spinlock_types.h instead" -+#endif -+ -+/* -+ * The non RT version maps spinlocks to raw_spinlocks -+ */ -+typedef struct spinlock { -+ union { -+ struct raw_spinlock rlock; -+ -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+# define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map)) -+ struct { -+ u8 __padding[LOCK_PADSIZE]; -+ struct lockdep_map dep_map; -+ }; -+#endif -+ }; -+} spinlock_t; -+ -+#define __SPIN_LOCK_INITIALIZER(lockname) \ -+ { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } } -+ -+#define __SPIN_LOCK_UNLOCKED(lockname) \ -+ (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname) -+ -+#define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x) -+ -+#endif -diff --git a/include/linux/spinlock_types_raw.h b/include/linux/spinlock_types_raw.h -new file mode 100644 -index 000000000000..edffc4d53fc9 ---- /dev/null -+++ b/include/linux/spinlock_types_raw.h -@@ -0,0 +1,56 @@ -+#ifndef __LINUX_SPINLOCK_TYPES_RAW_H -+#define __LINUX_SPINLOCK_TYPES_RAW_H -+ -+#if defined(CONFIG_SMP) -+# include <asm/spinlock_types.h> -+#else -+# include <linux/spinlock_types_up.h> -+#endif -+ -+#include <linux/lockdep.h> -+ -+typedef struct raw_spinlock { -+ arch_spinlock_t raw_lock; -+#ifdef CONFIG_GENERIC_LOCKBREAK -+ unsigned int break_lock; -+#endif -+#ifdef CONFIG_DEBUG_SPINLOCK -+ unsigned int magic, owner_cpu; -+ void *owner; -+#endif -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+ struct lockdep_map dep_map; -+#endif -+} raw_spinlock_t; -+ -+#define SPINLOCK_MAGIC 0xdead4ead -+ -+#define SPINLOCK_OWNER_INIT ((void *)-1L) -+ -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+# define SPIN_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname } -+#else -+# define SPIN_DEP_MAP_INIT(lockname) -+#endif -+ -+#ifdef CONFIG_DEBUG_SPINLOCK -+# define SPIN_DEBUG_INIT(lockname) \ -+ .magic = SPINLOCK_MAGIC, \ -+ .owner_cpu = -1, \ -+ .owner = SPINLOCK_OWNER_INIT, -+#else -+# define SPIN_DEBUG_INIT(lockname) -+#endif -+ -+#define __RAW_SPIN_LOCK_INITIALIZER(lockname) \ -+ { \ -+ .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED, \ -+ SPIN_DEBUG_INIT(lockname) \ -+ SPIN_DEP_MAP_INIT(lockname) } -+ -+#define __RAW_SPIN_LOCK_UNLOCKED(lockname) \ -+ (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname) -+ -+#define DEFINE_RAW_SPINLOCK(x) raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x) -+ -+#endif -diff --git a/include/linux/spinlock_types_rt.h b/include/linux/spinlock_types_rt.h -new file mode 100644 -index 000000000000..3e3d8c5f7a9a ---- /dev/null -+++ b/include/linux/spinlock_types_rt.h -@@ -0,0 +1,48 @@ -+#ifndef __LINUX_SPINLOCK_TYPES_RT_H -+#define __LINUX_SPINLOCK_TYPES_RT_H -+ -+#ifndef __LINUX_SPINLOCK_TYPES_H -+#error "Do not include directly. Include spinlock_types.h instead" -+#endif -+ -+#include <linux/cache.h> -+ -+/* -+ * PREEMPT_RT: spinlocks - an RT mutex plus lock-break field: -+ */ -+typedef struct spinlock { -+ struct rt_mutex lock; -+ unsigned int break_lock; -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+ struct lockdep_map dep_map; -+#endif -+} spinlock_t; -+ -+#ifdef CONFIG_DEBUG_RT_MUTEXES -+# define __RT_SPIN_INITIALIZER(name) \ -+ { \ -+ .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(name.wait_lock), \ -+ .save_state = 1, \ -+ .file = __FILE__, \ -+ .line = __LINE__ , \ -+ } -+#else -+# define __RT_SPIN_INITIALIZER(name) \ -+ { \ -+ .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(name.wait_lock), \ -+ .save_state = 1, \ -+ } -+#endif -+ -+/* -+.wait_list = PLIST_HEAD_INIT_RAW((name).lock.wait_list, (name).lock.wait_lock) -+*/ -+ -+#define __SPIN_LOCK_UNLOCKED(name) \ -+ { .lock = __RT_SPIN_INITIALIZER(name.lock), \ -+ SPIN_DEP_MAP_INIT(name) } -+ -+#define DEFINE_SPINLOCK(name) \ -+ spinlock_t name = __SPIN_LOCK_UNLOCKED(name) -+ -+#endif -diff --git a/include/linux/srcu.h b/include/linux/srcu.h -index dc8eb63c6568..e793d3a257da 100644 ---- a/include/linux/srcu.h -+++ b/include/linux/srcu.h -@@ -84,10 +84,10 @@ int init_srcu_struct(struct srcu_struct *sp); - - void process_srcu(struct work_struct *work); - --#define __SRCU_STRUCT_INIT(name) \ -+#define __SRCU_STRUCT_INIT(name, pcpu_name) \ - { \ - .completed = -300, \ -- .per_cpu_ref = &name##_srcu_array, \ -+ .per_cpu_ref = &pcpu_name, \ - .queue_lock = __SPIN_LOCK_UNLOCKED(name.queue_lock), \ - .running = false, \ - .batch_queue = RCU_BATCH_INIT(name.batch_queue), \ -@@ -119,7 +119,7 @@ void process_srcu(struct work_struct *work); - */ - #define __DEFINE_SRCU(name, is_static) \ - static DEFINE_PER_CPU(struct srcu_struct_array, name##_srcu_array);\ -- is_static struct srcu_struct name = __SRCU_STRUCT_INIT(name) -+ is_static struct srcu_struct name = __SRCU_STRUCT_INIT(name, name##_srcu_array) - #define DEFINE_SRCU(name) __DEFINE_SRCU(name, /* not static */) - #define DEFINE_STATIC_SRCU(name) __DEFINE_SRCU(name, static) - -diff --git a/include/linux/suspend.h b/include/linux/suspend.h -index 8b6ec7ef0854..9b77d4cc929f 100644 ---- a/include/linux/suspend.h -+++ b/include/linux/suspend.h -@@ -194,6 +194,12 @@ struct platform_freeze_ops { - void (*end)(void); - }; - -+#if defined(CONFIG_SUSPEND) || defined(CONFIG_HIBERNATION) -+extern bool pm_in_action; -+#else -+# define pm_in_action false -+#endif -+ - #ifdef CONFIG_SUSPEND - /** - * suspend_set_ops - set platform dependent suspend operations -diff --git a/include/linux/swait.h b/include/linux/swait.h -index c1f9c62a8a50..83f004a72320 100644 ---- a/include/linux/swait.h -+++ b/include/linux/swait.h -@@ -87,6 +87,7 @@ static inline int swait_active(struct swait_queue_head *q) - extern void swake_up(struct swait_queue_head *q); - extern void swake_up_all(struct swait_queue_head *q); - extern void swake_up_locked(struct swait_queue_head *q); -+extern void swake_up_all_locked(struct swait_queue_head *q); - - extern void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait); - extern void prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait, int state); -diff --git a/include/linux/swap.h b/include/linux/swap.h -index ad220359f1b0..2b7721949dd5 100644 ---- a/include/linux/swap.h -+++ b/include/linux/swap.h -@@ -11,6 +11,7 @@ - #include <linux/fs.h> - #include <linux/atomic.h> - #include <linux/page-flags.h> -+#include <linux/locallock.h> - #include <asm/page.h> - - struct notifier_block; -@@ -252,7 +253,8 @@ struct swap_info_struct { - void *workingset_eviction(struct address_space *mapping, struct page *page); - bool workingset_refault(void *shadow); - void workingset_activation(struct page *page); --extern struct list_lru workingset_shadow_nodes; -+extern struct list_lru __workingset_shadow_nodes; -+DECLARE_LOCAL_IRQ_LOCK(workingset_shadow_lock); - - static inline unsigned int workingset_node_pages(struct radix_tree_node *node) - { -@@ -295,6 +297,7 @@ extern unsigned long nr_free_pagecache_pages(void); - - - /* linux/mm/swap.c */ -+DECLARE_LOCAL_IRQ_LOCK(swapvec_lock); - extern void lru_cache_add(struct page *); - extern void lru_cache_add_anon(struct page *page); - extern void lru_cache_add_file(struct page *page); -diff --git a/include/linux/swork.h b/include/linux/swork.h -new file mode 100644 -index 000000000000..f175fa9a6016 ---- /dev/null -+++ b/include/linux/swork.h -@@ -0,0 +1,24 @@ -+#ifndef _LINUX_SWORK_H -+#define _LINUX_SWORK_H -+ -+#include <linux/list.h> -+ -+struct swork_event { -+ struct list_head item; -+ unsigned long flags; -+ void (*func)(struct swork_event *); -+}; -+ -+static inline void INIT_SWORK(struct swork_event *event, -+ void (*func)(struct swork_event *)) -+{ -+ event->flags = 0; -+ event->func = func; -+} -+ -+bool swork_queue(struct swork_event *sev); -+ -+int swork_get(void); -+void swork_put(void); -+ -+#endif /* _LINUX_SWORK_H */ -diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h -index b4c2a485b28a..5580c2c8410d 100644 ---- a/include/linux/thread_info.h -+++ b/include/linux/thread_info.h -@@ -103,7 +103,17 @@ static inline int test_ti_thread_flag(struct thread_info *ti, int flag) - #define test_thread_flag(flag) \ - test_ti_thread_flag(current_thread_info(), flag) - --#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) -+#ifdef CONFIG_PREEMPT_LAZY -+#define tif_need_resched() (test_thread_flag(TIF_NEED_RESCHED) || \ -+ test_thread_flag(TIF_NEED_RESCHED_LAZY)) -+#define tif_need_resched_now() (test_thread_flag(TIF_NEED_RESCHED)) -+#define tif_need_resched_lazy() test_thread_flag(TIF_NEED_RESCHED_LAZY)) -+ -+#else -+#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) -+#define tif_need_resched_now() test_thread_flag(TIF_NEED_RESCHED) -+#define tif_need_resched_lazy() 0 -+#endif - - #if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK - /* -diff --git a/include/linux/timer.h b/include/linux/timer.h -index 61aa61dc410c..a915acbd0072 100644 ---- a/include/linux/timer.h -+++ b/include/linux/timer.h -@@ -19,7 +19,6 @@ struct timer_list { - void (*function)(unsigned long); - unsigned long data; - u32 flags; -- int slack; - - #ifdef CONFIG_TIMER_STATS - int start_pid; -@@ -58,11 +57,14 @@ struct timer_list { - * workqueue locking issues. It's not meant for executing random crap - * with interrupts disabled. Abuse is monitored! - */ --#define TIMER_CPUMASK 0x0007FFFF --#define TIMER_MIGRATING 0x00080000 -+#define TIMER_CPUMASK 0x0003FFFF -+#define TIMER_MIGRATING 0x00040000 - #define TIMER_BASEMASK (TIMER_CPUMASK | TIMER_MIGRATING) --#define TIMER_DEFERRABLE 0x00100000 -+#define TIMER_DEFERRABLE 0x00080000 -+#define TIMER_PINNED 0x00100000 - #define TIMER_IRQSAFE 0x00200000 -+#define TIMER_ARRAYSHIFT 22 -+#define TIMER_ARRAYMASK 0xFFC00000 - - #define __TIMER_INITIALIZER(_function, _expires, _data, _flags) { \ - .entry = { .next = TIMER_ENTRY_STATIC }, \ -@@ -70,7 +72,6 @@ struct timer_list { - .expires = (_expires), \ - .data = (_data), \ - .flags = (_flags), \ -- .slack = -1, \ - __TIMER_LOCKDEP_MAP_INITIALIZER( \ - __FILE__ ":" __stringify(__LINE__)) \ - } -@@ -78,9 +79,15 @@ struct timer_list { - #define TIMER_INITIALIZER(_function, _expires, _data) \ - __TIMER_INITIALIZER((_function), (_expires), (_data), 0) - -+#define TIMER_PINNED_INITIALIZER(_function, _expires, _data) \ -+ __TIMER_INITIALIZER((_function), (_expires), (_data), TIMER_PINNED) -+ - #define TIMER_DEFERRED_INITIALIZER(_function, _expires, _data) \ - __TIMER_INITIALIZER((_function), (_expires), (_data), TIMER_DEFERRABLE) - -+#define TIMER_PINNED_DEFERRED_INITIALIZER(_function, _expires, _data) \ -+ __TIMER_INITIALIZER((_function), (_expires), (_data), TIMER_DEFERRABLE | TIMER_PINNED) -+ - #define DEFINE_TIMER(_name, _function, _expires, _data) \ - struct timer_list _name = \ - TIMER_INITIALIZER(_function, _expires, _data) -@@ -124,8 +131,12 @@ static inline void init_timer_on_stack_key(struct timer_list *timer, - - #define init_timer(timer) \ - __init_timer((timer), 0) -+#define init_timer_pinned(timer) \ -+ __init_timer((timer), TIMER_PINNED) - #define init_timer_deferrable(timer) \ - __init_timer((timer), TIMER_DEFERRABLE) -+#define init_timer_pinned_deferrable(timer) \ -+ __init_timer((timer), TIMER_DEFERRABLE | TIMER_PINNED) - #define init_timer_on_stack(timer) \ - __init_timer_on_stack((timer), 0) - -@@ -145,10 +156,20 @@ static inline void init_timer_on_stack_key(struct timer_list *timer, - - #define setup_timer(timer, fn, data) \ - __setup_timer((timer), (fn), (data), 0) -+#define setup_pinned_timer(timer, fn, data) \ -+ __setup_timer((timer), (fn), (data), TIMER_PINNED) -+#define setup_deferrable_timer(timer, fn, data) \ -+ __setup_timer((timer), (fn), (data), TIMER_DEFERRABLE) -+#define setup_pinned_deferrable_timer(timer, fn, data) \ -+ __setup_timer((timer), (fn), (data), TIMER_DEFERRABLE | TIMER_PINNED) - #define setup_timer_on_stack(timer, fn, data) \ - __setup_timer_on_stack((timer), (fn), (data), 0) -+#define setup_pinned_timer_on_stack(timer, fn, data) \ -+ __setup_timer_on_stack((timer), (fn), (data), TIMER_PINNED) - #define setup_deferrable_timer_on_stack(timer, fn, data) \ - __setup_timer_on_stack((timer), (fn), (data), TIMER_DEFERRABLE) -+#define setup_pinned_deferrable_timer_on_stack(timer, fn, data) \ -+ __setup_timer_on_stack((timer), (fn), (data), TIMER_DEFERRABLE | TIMER_PINNED) - - /** - * timer_pending - is a timer pending? -@@ -169,12 +190,7 @@ extern void add_timer_on(struct timer_list *timer, int cpu); - extern int del_timer(struct timer_list * timer); - extern int mod_timer(struct timer_list *timer, unsigned long expires); - extern int mod_timer_pending(struct timer_list *timer, unsigned long expires); --extern int mod_timer_pinned(struct timer_list *timer, unsigned long expires); - --extern void set_timer_slack(struct timer_list *time, int slack_hz); -- --#define TIMER_NOT_PINNED 0 --#define TIMER_PINNED 1 - /* - * The jiffies value which is added to now, when there is no timer - * in the timer wheel: -@@ -225,7 +241,7 @@ extern void add_timer(struct timer_list *timer); - - extern int try_to_del_timer_sync(struct timer_list *timer); - --#ifdef CONFIG_SMP -+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL) - extern int del_timer_sync(struct timer_list *timer); - #else - # define del_timer_sync(t) del_timer(t) -diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h -index 0810f81b6db2..682bfdf20f16 100644 ---- a/include/linux/trace_events.h -+++ b/include/linux/trace_events.h -@@ -56,6 +56,9 @@ struct trace_entry { - unsigned char flags; - unsigned char preempt_count; - int pid; -+ unsigned short migrate_disable; -+ unsigned short padding; -+ unsigned char preempt_lazy_count; - }; - - #define TRACE_EVENT_TYPE_MAX \ -diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h -index 349557825428..1d65e4f0668e 100644 ---- a/include/linux/uaccess.h -+++ b/include/linux/uaccess.h -@@ -24,6 +24,7 @@ static __always_inline void pagefault_disabled_dec(void) - */ - static inline void pagefault_disable(void) - { -+ migrate_disable(); - pagefault_disabled_inc(); - /* - * make sure to have issued the store before a pagefault -@@ -40,6 +41,7 @@ static inline void pagefault_enable(void) - */ - barrier(); - pagefault_disabled_dec(); -+ migrate_enable(); - } - - /* -diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h -index 4a29c75b146e..0a294e950df8 100644 ---- a/include/linux/uprobes.h -+++ b/include/linux/uprobes.h -@@ -27,6 +27,7 @@ - #include <linux/errno.h> - #include <linux/rbtree.h> - #include <linux/types.h> -+#include <linux/wait.h> - - struct vm_area_struct; - struct mm_struct; -diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h -index 73fae8c4a5fb..de8a124fd65d 100644 ---- a/include/linux/vmstat.h -+++ b/include/linux/vmstat.h -@@ -33,7 +33,9 @@ DECLARE_PER_CPU(struct vm_event_state, vm_event_states); - */ - static inline void __count_vm_event(enum vm_event_item item) - { -+ preempt_disable_rt(); - raw_cpu_inc(vm_event_states.event[item]); -+ preempt_enable_rt(); - } - - static inline void count_vm_event(enum vm_event_item item) -@@ -43,7 +45,9 @@ static inline void count_vm_event(enum vm_event_item item) - - static inline void __count_vm_events(enum vm_event_item item, long delta) - { -+ preempt_disable_rt(); - raw_cpu_add(vm_event_states.event[item], delta); -+ preempt_enable_rt(); - } - - static inline void count_vm_events(enum vm_event_item item, long delta) -diff --git a/include/linux/wait.h b/include/linux/wait.h -index 27d7a0ab5da3..7b3542de6db2 100644 ---- a/include/linux/wait.h -+++ b/include/linux/wait.h -@@ -8,6 +8,7 @@ - #include <linux/spinlock.h> - #include <asm/current.h> - #include <uapi/linux/wait.h> -+#include <linux/atomic.h> - - typedef struct __wait_queue wait_queue_t; - typedef int (*wait_queue_func_t)(wait_queue_t *wait, unsigned mode, int flags, void *key); -diff --git a/include/net/dst.h b/include/net/dst.h -index 5c98443c1c9e..22b81c7cec27 100644 ---- a/include/net/dst.h -+++ b/include/net/dst.h -@@ -449,7 +449,7 @@ static inline void dst_confirm(struct dst_entry *dst) - static inline int dst_neigh_output(struct dst_entry *dst, struct neighbour *n, - struct sk_buff *skb) - { -- const struct hh_cache *hh; -+ struct hh_cache *hh; - - if (dst->pending_confirm) { - unsigned long now = jiffies; -diff --git a/include/net/neighbour.h b/include/net/neighbour.h -index 8b683841e574..bf656008f6e7 100644 ---- a/include/net/neighbour.h -+++ b/include/net/neighbour.h -@@ -446,7 +446,7 @@ static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb) - } - #endif - --static inline int neigh_hh_output(const struct hh_cache *hh, struct sk_buff *skb) -+static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb) - { - unsigned int seq; - int hh_len; -@@ -501,7 +501,7 @@ struct neighbour_cb { - - #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb) - --static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n, -+static inline void neigh_ha_snapshot(char *dst, struct neighbour *n, - const struct net_device *dev) - { - unsigned int seq; -diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h -index a69cde3ce460..bee40aadee1f 100644 ---- a/include/net/netns/ipv4.h -+++ b/include/net/netns/ipv4.h -@@ -70,6 +70,7 @@ struct netns_ipv4 { - - int sysctl_icmp_echo_ignore_all; - int sysctl_icmp_echo_ignore_broadcasts; -+ int sysctl_icmp_echo_sysrq; - int sysctl_icmp_ignore_bogus_error_responses; - int sysctl_icmp_ratelimit; - int sysctl_icmp_ratemask; -diff --git a/include/trace/events/hist.h b/include/trace/events/hist.h -new file mode 100644 -index 000000000000..f7710de1b1f3 ---- /dev/null -+++ b/include/trace/events/hist.h -@@ -0,0 +1,73 @@ -+#undef TRACE_SYSTEM -+#define TRACE_SYSTEM hist -+ -+#if !defined(_TRACE_HIST_H) || defined(TRACE_HEADER_MULTI_READ) -+#define _TRACE_HIST_H -+ -+#include "latency_hist.h" -+#include <linux/tracepoint.h> -+ -+#if !defined(CONFIG_PREEMPT_OFF_HIST) && !defined(CONFIG_INTERRUPT_OFF_HIST) -+#define trace_preemptirqsoff_hist(a, b) -+#define trace_preemptirqsoff_hist_rcuidle(a, b) -+#else -+TRACE_EVENT(preemptirqsoff_hist, -+ -+ TP_PROTO(int reason, int starthist), -+ -+ TP_ARGS(reason, starthist), -+ -+ TP_STRUCT__entry( -+ __field(int, reason) -+ __field(int, starthist) -+ ), -+ -+ TP_fast_assign( -+ __entry->reason = reason; -+ __entry->starthist = starthist; -+ ), -+ -+ TP_printk("reason=%s starthist=%s", getaction(__entry->reason), -+ __entry->starthist ? "start" : "stop") -+); -+#endif -+ -+#ifndef CONFIG_MISSED_TIMER_OFFSETS_HIST -+#define trace_hrtimer_interrupt(a, b, c, d) -+#else -+TRACE_EVENT(hrtimer_interrupt, -+ -+ TP_PROTO(int cpu, long long offset, struct task_struct *curr, -+ struct task_struct *task), -+ -+ TP_ARGS(cpu, offset, curr, task), -+ -+ TP_STRUCT__entry( -+ __field(int, cpu) -+ __field(long long, offset) -+ __array(char, ccomm, TASK_COMM_LEN) -+ __field(int, cprio) -+ __array(char, tcomm, TASK_COMM_LEN) -+ __field(int, tprio) -+ ), -+ -+ TP_fast_assign( -+ __entry->cpu = cpu; -+ __entry->offset = offset; -+ memcpy(__entry->ccomm, curr->comm, TASK_COMM_LEN); -+ __entry->cprio = curr->prio; -+ memcpy(__entry->tcomm, task != NULL ? task->comm : "<none>", -+ task != NULL ? TASK_COMM_LEN : 7); -+ __entry->tprio = task != NULL ? task->prio : -1; -+ ), -+ -+ TP_printk("cpu=%d offset=%lld curr=%s[%d] thread=%s[%d]", -+ __entry->cpu, __entry->offset, __entry->ccomm, -+ __entry->cprio, __entry->tcomm, __entry->tprio) -+); -+#endif -+ -+#endif /* _TRACE_HIST_H */ -+ -+/* This part must be outside protection */ -+#include <trace/define_trace.h> -diff --git a/include/trace/events/latency_hist.h b/include/trace/events/latency_hist.h -new file mode 100644 -index 000000000000..d3f2fbd560b1 ---- /dev/null -+++ b/include/trace/events/latency_hist.h -@@ -0,0 +1,29 @@ -+#ifndef _LATENCY_HIST_H -+#define _LATENCY_HIST_H -+ -+enum hist_action { -+ IRQS_ON, -+ PREEMPT_ON, -+ TRACE_STOP, -+ IRQS_OFF, -+ PREEMPT_OFF, -+ TRACE_START, -+}; -+ -+static char *actions[] = { -+ "IRQS_ON", -+ "PREEMPT_ON", -+ "TRACE_STOP", -+ "IRQS_OFF", -+ "PREEMPT_OFF", -+ "TRACE_START", -+}; -+ -+static inline char *getaction(int action) -+{ -+ if (action >= 0 && action <= sizeof(actions)/sizeof(actions[0])) -+ return actions[action]; -+ return "unknown"; -+} -+ -+#endif /* _LATENCY_HIST_H */ -diff --git a/init/Kconfig b/init/Kconfig -index 0dfd09d54c65..a74c5a0d8376 100644 ---- a/init/Kconfig -+++ b/init/Kconfig -@@ -494,7 +494,7 @@ config TINY_RCU - - config RCU_EXPERT - bool "Make expert-level adjustments to RCU configuration" -- default n -+ default y if PREEMPT_RT_FULL - help - This option needs to be enabled if you wish to make - expert-level adjustments to RCU configuration. By default, -@@ -610,7 +610,7 @@ config RCU_FANOUT_LEAF - - config RCU_FAST_NO_HZ - bool "Accelerate last non-dyntick-idle CPU's grace periods" -- depends on NO_HZ_COMMON && SMP && RCU_EXPERT -+ depends on NO_HZ_COMMON && SMP && RCU_EXPERT && !PREEMPT_RT_FULL - default n - help - This option permits CPUs to enter dynticks-idle state even if -@@ -637,7 +637,7 @@ config TREE_RCU_TRACE - config RCU_BOOST - bool "Enable RCU priority boosting" - depends on RT_MUTEXES && PREEMPT_RCU && RCU_EXPERT -- default n -+ default y if PREEMPT_RT_FULL - help - This option boosts the priority of preempted RCU readers that - block the current preemptible RCU grace period for too long. -@@ -1029,6 +1029,7 @@ config CFS_BANDWIDTH - config RT_GROUP_SCHED - bool "Group scheduling for SCHED_RR/FIFO" - depends on CGROUP_SCHED -+ depends on !PREEMPT_RT_FULL - default n - help - This feature lets you explicitly allocate real CPU bandwidth -@@ -1717,6 +1718,7 @@ choice - - config SLAB - bool "SLAB" -+ depends on !PREEMPT_RT_FULL - help - The regular slab allocator that is established and known to work - well in all environments. It organizes cache hot objects in -@@ -1735,6 +1737,7 @@ config SLUB - config SLOB - depends on EXPERT - bool "SLOB (Simple Allocator)" -+ depends on !PREEMPT_RT_FULL - help - SLOB replaces the stock allocator with a drastically simpler - allocator. SLOB is generally more space efficient but -@@ -1744,7 +1747,7 @@ endchoice - - config SLUB_CPU_PARTIAL - default y -- depends on SLUB && SMP -+ depends on SLUB && SMP && !PREEMPT_RT_FULL - bool "SLUB per cpu partial cache" - help - Per cpu partial caches accellerate objects allocation and freeing -diff --git a/init/Makefile b/init/Makefile -index 7bc47ee31c36..88cf473554e0 100644 ---- a/init/Makefile -+++ b/init/Makefile -@@ -33,4 +33,4 @@ $(obj)/version.o: include/generated/compile.h - include/generated/compile.h: FORCE - @$($(quiet)chk_compile.h) - $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@ \ -- "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" "$(CC) $(KBUILD_CFLAGS)" -+ "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" "$(CONFIG_PREEMPT_RT_FULL)" "$(CC) $(KBUILD_CFLAGS)" -diff --git a/init/main.c b/init/main.c -index b3c6e363ae18..920f9ebd3d95 100644 ---- a/init/main.c -+++ b/init/main.c -@@ -507,6 +507,7 @@ asmlinkage __visible void __init start_kernel(void) - setup_command_line(command_line); - setup_nr_cpu_ids(); - setup_per_cpu_areas(); -+ softirq_early_init(); - boot_cpu_state_init(); - smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ - -diff --git a/ipc/msg.c b/ipc/msg.c -index 1471db9a7e61..b8c5e7f2bebc 100644 ---- a/ipc/msg.c -+++ b/ipc/msg.c -@@ -183,20 +183,14 @@ static void ss_wakeup(struct list_head *h, int kill) - } - } - --static void expunge_all(struct msg_queue *msq, int res) -+static void expunge_all(struct msg_queue *msq, int res, -+ struct wake_q_head *wake_q) - { - struct msg_receiver *msr, *t; - - list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) { -- msr->r_msg = NULL; /* initialize expunge ordering */ -- wake_up_process(msr->r_tsk); -- /* -- * Ensure that the wakeup is visible before setting r_msg as -- * the receiving end depends on it: either spinning on a nil, -- * or dealing with -EAGAIN cases. See lockless receive part 1 -- * and 2 in do_msgrcv(). -- */ -- smp_wmb(); /* barrier (B) */ -+ -+ wake_q_add(wake_q, msr->r_tsk); - msr->r_msg = ERR_PTR(res); - } - } -@@ -213,11 +207,13 @@ static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp) - { - struct msg_msg *msg, *t; - struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm); -+ WAKE_Q(wake_q); - -- expunge_all(msq, -EIDRM); -+ expunge_all(msq, -EIDRM, &wake_q); - ss_wakeup(&msq->q_senders, 1); - msg_rmid(ns, msq); - ipc_unlock_object(&msq->q_perm); -+ wake_up_q(&wake_q); - rcu_read_unlock(); - - list_for_each_entry_safe(msg, t, &msq->q_messages, m_list) { -@@ -342,6 +338,7 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd, - struct kern_ipc_perm *ipcp; - struct msqid64_ds uninitialized_var(msqid64); - struct msg_queue *msq; -+ WAKE_Q(wake_q); - int err; - - if (cmd == IPC_SET) { -@@ -389,7 +386,7 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd, - /* sleeping receivers might be excluded by - * stricter permissions. - */ -- expunge_all(msq, -EAGAIN); -+ expunge_all(msq, -EAGAIN, &wake_q); - /* sleeping senders might be able to send - * due to a larger queue size. - */ -@@ -402,6 +399,7 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd, - - out_unlock0: - ipc_unlock_object(&msq->q_perm); -+ wake_up_q(&wake_q); - out_unlock1: - rcu_read_unlock(); - out_up: -@@ -566,7 +564,8 @@ static int testmsg(struct msg_msg *msg, long type, int mode) - return 0; - } - --static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg) -+static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg, -+ struct wake_q_head *wake_q) - { - struct msg_receiver *msr, *t; - -@@ -577,27 +576,13 @@ static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg) - - list_del(&msr->r_list); - if (msr->r_maxsize < msg->m_ts) { -- /* initialize pipelined send ordering */ -- msr->r_msg = NULL; -- wake_up_process(msr->r_tsk); -- /* barrier (B) see barrier comment below */ -- smp_wmb(); -+ wake_q_add(wake_q, msr->r_tsk); - msr->r_msg = ERR_PTR(-E2BIG); - } else { -- msr->r_msg = NULL; - msq->q_lrpid = task_pid_vnr(msr->r_tsk); - msq->q_rtime = get_seconds(); -- wake_up_process(msr->r_tsk); -- /* -- * Ensure that the wakeup is visible before -- * setting r_msg, as the receiving can otherwise -- * exit - once r_msg is set, the receiver can -- * continue. See lockless receive part 1 and 2 -- * in do_msgrcv(). Barrier (B). -- */ -- smp_wmb(); -+ wake_q_add(wake_q, msr->r_tsk); - msr->r_msg = msg; -- - return 1; - } - } -@@ -613,6 +598,7 @@ long do_msgsnd(int msqid, long mtype, void __user *mtext, - struct msg_msg *msg; - int err; - struct ipc_namespace *ns; -+ WAKE_Q(wake_q); - - ns = current->nsproxy->ipc_ns; - -@@ -698,7 +684,7 @@ long do_msgsnd(int msqid, long mtype, void __user *mtext, - msq->q_lspid = task_tgid_vnr(current); - msq->q_stime = get_seconds(); - -- if (!pipelined_send(msq, msg)) { -+ if (!pipelined_send(msq, msg, &wake_q)) { - /* no one is waiting for this message, enqueue it */ - list_add_tail(&msg->m_list, &msq->q_messages); - msq->q_cbytes += msgsz; -@@ -712,6 +698,7 @@ long do_msgsnd(int msqid, long mtype, void __user *mtext, - - out_unlock0: - ipc_unlock_object(&msq->q_perm); -+ wake_up_q(&wake_q); - out_unlock1: - rcu_read_unlock(); - if (msg != NULL) -@@ -932,57 +919,25 @@ long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, int msgfl - rcu_read_lock(); - - /* Lockless receive, part 2: -- * Wait until pipelined_send or expunge_all are outside of -- * wake_up_process(). There is a race with exit(), see -- * ipc/mqueue.c for the details. The correct serialization -- * ensures that a receiver cannot continue without the wakeup -- * being visibible _before_ setting r_msg: -+ * The work in pipelined_send() and expunge_all(): -+ * - Set pointer to message -+ * - Queue the receiver task for later wakeup -+ * - Wake up the process after the lock is dropped. - * -- * CPU 0 CPU 1 -- * <loop receiver> -- * smp_rmb(); (A) <-- pair -. <waker thread> -- * <load ->r_msg> | msr->r_msg = NULL; -- * | wake_up_process(); -- * <continue> `------> smp_wmb(); (B) -- * msr->r_msg = msg; -- * -- * Where (A) orders the message value read and where (B) orders -- * the write to the r_msg -- done in both pipelined_send and -- * expunge_all. -+ * Should the process wake up before this wakeup (due to a -+ * signal) it will either see the message and continue … - */ -- for (;;) { -- /* -- * Pairs with writer barrier in pipelined_send -- * or expunge_all. -- */ -- smp_rmb(); /* barrier (A) */ -- msg = (struct msg_msg *)msr_d.r_msg; -- if (msg) -- break; - -- /* -- * The cpu_relax() call is a compiler barrier -- * which forces everything in this loop to be -- * re-loaded. -- */ -- cpu_relax(); -- } -- -- /* Lockless receive, part 3: -- * If there is a message or an error then accept it without -- * locking. -- */ -+ msg = (struct msg_msg *)msr_d.r_msg; - if (msg != ERR_PTR(-EAGAIN)) - goto out_unlock1; - -- /* Lockless receive, part 3: -- * Acquire the queue spinlock. -- */ -+ /* -+ * … or see -EAGAIN, acquire the lock to check the message -+ * again. -+ */ - ipc_lock_object(&msq->q_perm); - -- /* Lockless receive, part 4: -- * Repeat test after acquiring the spinlock. -- */ - msg = (struct msg_msg *)msr_d.r_msg; - if (msg != ERR_PTR(-EAGAIN)) - goto out_unlock0; -diff --git a/ipc/sem.c b/ipc/sem.c -index b3757ea0694b..981a60ac6b6c 100644 ---- a/ipc/sem.c -+++ b/ipc/sem.c -@@ -697,6 +697,13 @@ static int perform_atomic_semop(struct sem_array *sma, struct sem_queue *q) - static void wake_up_sem_queue_prepare(struct list_head *pt, - struct sem_queue *q, int error) - { -+#ifdef CONFIG_PREEMPT_RT_BASE -+ struct task_struct *p = q->sleeper; -+ get_task_struct(p); -+ q->status = error; -+ wake_up_process(p); -+ put_task_struct(p); -+#else - if (list_empty(pt)) { - /* - * Hold preempt off so that we don't get preempted and have the -@@ -708,6 +715,7 @@ static void wake_up_sem_queue_prepare(struct list_head *pt, - q->pid = error; - - list_add_tail(&q->list, pt); -+#endif - } - - /** -@@ -721,6 +729,7 @@ static void wake_up_sem_queue_prepare(struct list_head *pt, - */ - static void wake_up_sem_queue_do(struct list_head *pt) - { -+#ifndef CONFIG_PREEMPT_RT_BASE - struct sem_queue *q, *t; - int did_something; - -@@ -733,6 +742,7 @@ static void wake_up_sem_queue_do(struct list_head *pt) - } - if (did_something) - preempt_enable(); -+#endif - } - - static void unlink_queue(struct sem_array *sma, struct sem_queue *q) -diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks -index ebdb0043203a..b9e6aa7e5aa6 100644 ---- a/kernel/Kconfig.locks -+++ b/kernel/Kconfig.locks -@@ -225,11 +225,11 @@ config ARCH_SUPPORTS_ATOMIC_RMW - - config MUTEX_SPIN_ON_OWNER - def_bool y -- depends on SMP && !DEBUG_MUTEXES && ARCH_SUPPORTS_ATOMIC_RMW -+ depends on SMP && !DEBUG_MUTEXES && ARCH_SUPPORTS_ATOMIC_RMW && !PREEMPT_RT_FULL - - config RWSEM_SPIN_ON_OWNER - def_bool y -- depends on SMP && RWSEM_XCHGADD_ALGORITHM && ARCH_SUPPORTS_ATOMIC_RMW -+ depends on SMP && RWSEM_XCHGADD_ALGORITHM && ARCH_SUPPORTS_ATOMIC_RMW && !PREEMPT_RT_FULL - - config LOCK_SPIN_ON_OWNER - def_bool y -diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt -index 3f9c97419f02..11dbe26a8279 100644 ---- a/kernel/Kconfig.preempt -+++ b/kernel/Kconfig.preempt -@@ -1,3 +1,16 @@ -+config PREEMPT -+ bool -+ select PREEMPT_COUNT -+ -+config PREEMPT_RT_BASE -+ bool -+ select PREEMPT -+ -+config HAVE_PREEMPT_LAZY -+ bool -+ -+config PREEMPT_LAZY -+ def_bool y if HAVE_PREEMPT_LAZY && PREEMPT_RT_FULL - - choice - prompt "Preemption Model" -@@ -33,9 +46,9 @@ config PREEMPT_VOLUNTARY - - Select this if you are building a kernel for a desktop system. - --config PREEMPT -+config PREEMPT__LL - bool "Preemptible Kernel (Low-Latency Desktop)" -- select PREEMPT_COUNT -+ select PREEMPT - select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK - help - This option reduces the latency of the kernel by making -@@ -52,6 +65,22 @@ config PREEMPT - embedded system with latency requirements in the milliseconds - range. - -+config PREEMPT_RTB -+ bool "Preemptible Kernel (Basic RT)" -+ select PREEMPT_RT_BASE -+ help -+ This option is basically the same as (Low-Latency Desktop) but -+ enables changes which are preliminary for the full preemptible -+ RT kernel. -+ -+config PREEMPT_RT_FULL -+ bool "Fully Preemptible Kernel (RT)" -+ depends on IRQ_FORCED_THREADING -+ select PREEMPT_RT_BASE -+ select PREEMPT_RCU -+ help -+ All and everything -+ - endchoice - - config PREEMPT_COUNT -diff --git a/kernel/cgroup.c b/kernel/cgroup.c -index 86cb5c6e8932..3920f49948f8 100644 ---- a/kernel/cgroup.c -+++ b/kernel/cgroup.c -@@ -5005,10 +5005,10 @@ static void css_free_rcu_fn(struct rcu_head *rcu_head) - queue_work(cgroup_destroy_wq, &css->destroy_work); - } - --static void css_release_work_fn(struct work_struct *work) -+static void css_release_work_fn(struct swork_event *sev) - { - struct cgroup_subsys_state *css = -- container_of(work, struct cgroup_subsys_state, destroy_work); -+ container_of(sev, struct cgroup_subsys_state, destroy_swork); - struct cgroup_subsys *ss = css->ss; - struct cgroup *cgrp = css->cgroup; - -@@ -5049,8 +5049,8 @@ static void css_release(struct percpu_ref *ref) - struct cgroup_subsys_state *css = - container_of(ref, struct cgroup_subsys_state, refcnt); - -- INIT_WORK(&css->destroy_work, css_release_work_fn); -- queue_work(cgroup_destroy_wq, &css->destroy_work); -+ INIT_SWORK(&css->destroy_swork, css_release_work_fn); -+ swork_queue(&css->destroy_swork); - } - - static void init_and_link_css(struct cgroup_subsys_state *css, -@@ -5694,6 +5694,7 @@ static int __init cgroup_wq_init(void) - */ - cgroup_destroy_wq = alloc_workqueue("cgroup_destroy", 0, 1); - BUG_ON(!cgroup_destroy_wq); -+ BUG_ON(swork_get()); - - /* - * Used to destroy pidlists and separate to serve as flush domain. -diff --git a/kernel/cpu.c b/kernel/cpu.c -index 3e3f6e49eabb..e4d7491c1c12 100644 ---- a/kernel/cpu.c -+++ b/kernel/cpu.c -@@ -152,8 +152,8 @@ static struct { - #endif - } cpu_hotplug = { - .active_writer = NULL, -- .wq = __WAIT_QUEUE_HEAD_INITIALIZER(cpu_hotplug.wq), - .lock = __MUTEX_INITIALIZER(cpu_hotplug.lock), -+ .wq = __WAIT_QUEUE_HEAD_INITIALIZER(cpu_hotplug.wq), - #ifdef CONFIG_DEBUG_LOCK_ALLOC - .dep_map = {.name = "cpu_hotplug.lock" }, - #endif -@@ -166,6 +166,289 @@ static struct { - #define cpuhp_lock_acquire() lock_map_acquire(&cpu_hotplug.dep_map) - #define cpuhp_lock_release() lock_map_release(&cpu_hotplug.dep_map) - -+/** -+ * hotplug_pcp - per cpu hotplug descriptor -+ * @unplug: set when pin_current_cpu() needs to sync tasks -+ * @sync_tsk: the task that waits for tasks to finish pinned sections -+ * @refcount: counter of tasks in pinned sections -+ * @grab_lock: set when the tasks entering pinned sections should wait -+ * @synced: notifier for @sync_tsk to tell cpu_down it's finished -+ * @mutex: the mutex to make tasks wait (used when @grab_lock is true) -+ * @mutex_init: zero if the mutex hasn't been initialized yet. -+ * -+ * Although @unplug and @sync_tsk may point to the same task, the @unplug -+ * is used as a flag and still exists after @sync_tsk has exited and -+ * @sync_tsk set to NULL. -+ */ -+struct hotplug_pcp { -+ struct task_struct *unplug; -+ struct task_struct *sync_tsk; -+ int refcount; -+ int grab_lock; -+ struct completion synced; -+ struct completion unplug_wait; -+#ifdef CONFIG_PREEMPT_RT_FULL -+ /* -+ * Note, on PREEMPT_RT, the hotplug lock must save the state of -+ * the task, otherwise the mutex will cause the task to fail -+ * to sleep when required. (Because it's called from migrate_disable()) -+ * -+ * The spinlock_t on PREEMPT_RT is a mutex that saves the task's -+ * state. -+ */ -+ spinlock_t lock; -+#else -+ struct mutex mutex; -+#endif -+ int mutex_init; -+}; -+ -+#ifdef CONFIG_PREEMPT_RT_FULL -+# define hotplug_lock(hp) rt_spin_lock__no_mg(&(hp)->lock) -+# define hotplug_unlock(hp) rt_spin_unlock__no_mg(&(hp)->lock) -+#else -+# define hotplug_lock(hp) mutex_lock(&(hp)->mutex) -+# define hotplug_unlock(hp) mutex_unlock(&(hp)->mutex) -+#endif -+ -+static DEFINE_PER_CPU(struct hotplug_pcp, hotplug_pcp); -+ -+/** -+ * pin_current_cpu - Prevent the current cpu from being unplugged -+ * -+ * Lightweight version of get_online_cpus() to prevent cpu from being -+ * unplugged when code runs in a migration disabled region. -+ * -+ * Must be called with preemption disabled (preempt_count = 1)! -+ */ -+void pin_current_cpu(void) -+{ -+ struct hotplug_pcp *hp; -+ int force = 0; -+ -+retry: -+ hp = this_cpu_ptr(&hotplug_pcp); -+ -+ if (!hp->unplug || hp->refcount || force || preempt_count() > 1 || -+ hp->unplug == current) { -+ hp->refcount++; -+ return; -+ } -+ if (hp->grab_lock) { -+ preempt_enable(); -+ hotplug_lock(hp); -+ hotplug_unlock(hp); -+ } else { -+ preempt_enable(); -+ /* -+ * Try to push this task off of this CPU. -+ */ -+ if (!migrate_me()) { -+ preempt_disable(); -+ hp = this_cpu_ptr(&hotplug_pcp); -+ if (!hp->grab_lock) { -+ /* -+ * Just let it continue it's already pinned -+ * or about to sleep. -+ */ -+ force = 1; -+ goto retry; -+ } -+ preempt_enable(); -+ } -+ } -+ preempt_disable(); -+ goto retry; -+} -+ -+/** -+ * unpin_current_cpu - Allow unplug of current cpu -+ * -+ * Must be called with preemption or interrupts disabled! -+ */ -+void unpin_current_cpu(void) -+{ -+ struct hotplug_pcp *hp = this_cpu_ptr(&hotplug_pcp); -+ -+ WARN_ON(hp->refcount <= 0); -+ -+ /* This is safe. sync_unplug_thread is pinned to this cpu */ -+ if (!--hp->refcount && hp->unplug && hp->unplug != current) -+ wake_up_process(hp->unplug); -+} -+ -+static void wait_for_pinned_cpus(struct hotplug_pcp *hp) -+{ -+ set_current_state(TASK_UNINTERRUPTIBLE); -+ while (hp->refcount) { -+ schedule_preempt_disabled(); -+ set_current_state(TASK_UNINTERRUPTIBLE); -+ } -+} -+ -+static int sync_unplug_thread(void *data) -+{ -+ struct hotplug_pcp *hp = data; -+ -+ wait_for_completion(&hp->unplug_wait); -+ preempt_disable(); -+ hp->unplug = current; -+ wait_for_pinned_cpus(hp); -+ -+ /* -+ * This thread will synchronize the cpu_down() with threads -+ * that have pinned the CPU. When the pinned CPU count reaches -+ * zero, we inform the cpu_down code to continue to the next step. -+ */ -+ set_current_state(TASK_UNINTERRUPTIBLE); -+ preempt_enable(); -+ complete(&hp->synced); -+ -+ /* -+ * If all succeeds, the next step will need tasks to wait till -+ * the CPU is offline before continuing. To do this, the grab_lock -+ * is set and tasks going into pin_current_cpu() will block on the -+ * mutex. But we still need to wait for those that are already in -+ * pinned CPU sections. If the cpu_down() failed, the kthread_should_stop() -+ * will kick this thread out. -+ */ -+ while (!hp->grab_lock && !kthread_should_stop()) { -+ schedule(); -+ set_current_state(TASK_UNINTERRUPTIBLE); -+ } -+ -+ /* Make sure grab_lock is seen before we see a stale completion */ -+ smp_mb(); -+ -+ /* -+ * Now just before cpu_down() enters stop machine, we need to make -+ * sure all tasks that are in pinned CPU sections are out, and new -+ * tasks will now grab the lock, keeping them from entering pinned -+ * CPU sections. -+ */ -+ if (!kthread_should_stop()) { -+ preempt_disable(); -+ wait_for_pinned_cpus(hp); -+ preempt_enable(); -+ complete(&hp->synced); -+ } -+ -+ set_current_state(TASK_UNINTERRUPTIBLE); -+ while (!kthread_should_stop()) { -+ schedule(); -+ set_current_state(TASK_UNINTERRUPTIBLE); -+ } -+ set_current_state(TASK_RUNNING); -+ -+ /* -+ * Force this thread off this CPU as it's going down and -+ * we don't want any more work on this CPU. -+ */ -+ current->flags &= ~PF_NO_SETAFFINITY; -+ set_cpus_allowed_ptr(current, cpu_present_mask); -+ migrate_me(); -+ return 0; -+} -+ -+static void __cpu_unplug_sync(struct hotplug_pcp *hp) -+{ -+ wake_up_process(hp->sync_tsk); -+ wait_for_completion(&hp->synced); -+} -+ -+static void __cpu_unplug_wait(unsigned int cpu) -+{ -+ struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu); -+ -+ complete(&hp->unplug_wait); -+ wait_for_completion(&hp->synced); -+} -+ -+/* -+ * Start the sync_unplug_thread on the target cpu and wait for it to -+ * complete. -+ */ -+static int cpu_unplug_begin(unsigned int cpu) -+{ -+ struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu); -+ int err; -+ -+ /* Protected by cpu_hotplug.lock */ -+ if (!hp->mutex_init) { -+#ifdef CONFIG_PREEMPT_RT_FULL -+ spin_lock_init(&hp->lock); -+#else -+ mutex_init(&hp->mutex); -+#endif -+ hp->mutex_init = 1; -+ } -+ -+ /* Inform the scheduler to migrate tasks off this CPU */ -+ tell_sched_cpu_down_begin(cpu); -+ -+ init_completion(&hp->synced); -+ init_completion(&hp->unplug_wait); -+ -+ hp->sync_tsk = kthread_create(sync_unplug_thread, hp, "sync_unplug/%d", cpu); -+ if (IS_ERR(hp->sync_tsk)) { -+ err = PTR_ERR(hp->sync_tsk); -+ hp->sync_tsk = NULL; -+ return err; -+ } -+ kthread_bind(hp->sync_tsk, cpu); -+ -+ /* -+ * Wait for tasks to get out of the pinned sections, -+ * it's still OK if new tasks enter. Some CPU notifiers will -+ * wait for tasks that are going to enter these sections and -+ * we must not have them block. -+ */ -+ wake_up_process(hp->sync_tsk); -+ return 0; -+} -+ -+static void cpu_unplug_sync(unsigned int cpu) -+{ -+ struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu); -+ -+ init_completion(&hp->synced); -+ /* The completion needs to be initialzied before setting grab_lock */ -+ smp_wmb(); -+ -+ /* Grab the mutex before setting grab_lock */ -+ hotplug_lock(hp); -+ hp->grab_lock = 1; -+ -+ /* -+ * The CPU notifiers have been completed. -+ * Wait for tasks to get out of pinned CPU sections and have new -+ * tasks block until the CPU is completely down. -+ */ -+ __cpu_unplug_sync(hp); -+ -+ /* All done with the sync thread */ -+ kthread_stop(hp->sync_tsk); -+ hp->sync_tsk = NULL; -+} -+ -+static void cpu_unplug_done(unsigned int cpu) -+{ -+ struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu); -+ -+ hp->unplug = NULL; -+ /* Let all tasks know cpu unplug is finished before cleaning up */ -+ smp_wmb(); -+ -+ if (hp->sync_tsk) -+ kthread_stop(hp->sync_tsk); -+ -+ if (hp->grab_lock) { -+ hotplug_unlock(hp); -+ /* protected by cpu_hotplug.lock */ -+ hp->grab_lock = 0; -+ } -+ tell_sched_cpu_down_done(cpu); -+} - - void get_online_cpus(void) - { -@@ -718,10 +1001,14 @@ static int takedown_cpu(unsigned int cpu) - else - synchronize_rcu(); - -+ __cpu_unplug_wait(cpu); - /* Park the smpboot threads */ - kthread_park(per_cpu_ptr(&cpuhp_state, cpu)->thread); - smpboot_park_threads(cpu); - -+ /* Notifiers are done. Don't let any more tasks pin this CPU. */ -+ cpu_unplug_sync(cpu); -+ - /* - * Prevent irq alloc/free while the dying cpu reorganizes the - * interrupt affinities. -@@ -807,6 +1094,9 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen, - struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); - int prev_state, ret = 0; - bool hasdied = false; -+ int mycpu; -+ cpumask_var_t cpumask; -+ cpumask_var_t cpumask_org; - - if (num_online_cpus() == 1) - return -EBUSY; -@@ -814,7 +1104,34 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen, - if (!cpu_present(cpu)) - return -EINVAL; - -+ /* Move the downtaker off the unplug cpu */ -+ if (!alloc_cpumask_var(&cpumask, GFP_KERNEL)) -+ return -ENOMEM; -+ if (!alloc_cpumask_var(&cpumask_org, GFP_KERNEL)) { -+ free_cpumask_var(cpumask); -+ return -ENOMEM; -+ } -+ -+ cpumask_copy(cpumask_org, tsk_cpus_allowed(current)); -+ cpumask_andnot(cpumask, cpu_online_mask, cpumask_of(cpu)); -+ set_cpus_allowed_ptr(current, cpumask); -+ free_cpumask_var(cpumask); -+ migrate_disable(); -+ mycpu = smp_processor_id(); -+ if (mycpu == cpu) { -+ printk(KERN_ERR "Yuck! Still on unplug CPU\n!"); -+ migrate_enable(); -+ ret = -EBUSY; -+ goto restore_cpus; -+ } -+ -+ migrate_enable(); - cpu_hotplug_begin(); -+ ret = cpu_unplug_begin(cpu); -+ if (ret) { -+ printk("cpu_unplug_begin(%d) failed\n", cpu); -+ goto out_cancel; -+ } - - cpuhp_tasks_frozen = tasks_frozen; - -@@ -853,10 +1170,15 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen, - - hasdied = prev_state != st->state && st->state == CPUHP_OFFLINE; - out: -+ cpu_unplug_done(cpu); -+out_cancel: - cpu_hotplug_done(); - /* This post dead nonsense must die */ - if (!ret && hasdied) - cpu_notify_nofail(CPU_POST_DEAD, cpu); -+restore_cpus: -+ set_cpus_allowed_ptr(current, cpumask_org); -+ free_cpumask_var(cpumask_org); - return ret; - } - -diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c -index fc1ef736253c..83c666537a7a 100644 ---- a/kernel/debug/kdb/kdb_io.c -+++ b/kernel/debug/kdb/kdb_io.c -@@ -554,7 +554,6 @@ int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap) - int linecount; - int colcount; - int logging, saved_loglevel = 0; -- int saved_trap_printk; - int got_printf_lock = 0; - int retlen = 0; - int fnd, len; -@@ -565,8 +564,6 @@ int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap) - unsigned long uninitialized_var(flags); - - preempt_disable(); -- saved_trap_printk = kdb_trap_printk; -- kdb_trap_printk = 0; - - /* Serialize kdb_printf if multiple cpus try to write at once. - * But if any cpu goes recursive in kdb, just print the output, -@@ -855,7 +852,6 @@ int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap) - } else { - __release(kdb_printf_lock); - } -- kdb_trap_printk = saved_trap_printk; - preempt_enable(); - return retlen; - } -@@ -865,9 +861,11 @@ int kdb_printf(const char *fmt, ...) - va_list ap; - int r; - -+ kdb_trap_printk++; - va_start(ap, fmt); - r = vkdb_printf(KDB_MSGSRC_INTERNAL, fmt, ap); - va_end(ap); -+ kdb_trap_printk--; - - return r; - } -diff --git a/kernel/events/core.c b/kernel/events/core.c -index a69c90cea05d..dc7b7c094abb 100644 ---- a/kernel/events/core.c -+++ b/kernel/events/core.c -@@ -963,6 +963,7 @@ static void __perf_mux_hrtimer_init(struct perf_cpu_context *cpuctx, int cpu) - raw_spin_lock_init(&cpuctx->hrtimer_lock); - hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED); - timer->function = perf_mux_hrtimer_handler; -+ timer->irqsafe = 1; - } - - static int perf_mux_hrtimer_restart(struct perf_cpu_context *cpuctx) -@@ -7261,6 +7262,7 @@ static void perf_swevent_init_hrtimer(struct perf_event *event) - - hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); - hwc->hrtimer.function = perf_swevent_hrtimer; -+ hwc->hrtimer.irqsafe = 1; - - /* - * Since hrtimers have a fixed rate, we can do a static freq->period -diff --git a/kernel/exit.c b/kernel/exit.c -index 79c7e38a203b..12da2d0ba120 100644 ---- a/kernel/exit.c -+++ b/kernel/exit.c -@@ -143,7 +143,7 @@ static void __exit_signal(struct task_struct *tsk) - * Do this under ->siglock, we can race with another thread - * doing sigqueue_free() if we have SIGQUEUE_PREALLOC signals. - */ -- flush_sigqueue(&tsk->pending); -+ flush_task_sigqueue(tsk); - tsk->sighand = NULL; - spin_unlock(&sighand->siglock); - -diff --git a/kernel/fork.c b/kernel/fork.c -index d277e83ed3e0..18cc63048297 100644 ---- a/kernel/fork.c -+++ b/kernel/fork.c -@@ -253,7 +253,9 @@ static inline void put_signal_struct(struct signal_struct *sig) - if (atomic_dec_and_test(&sig->sigcnt)) - free_signal_struct(sig); - } -- -+#ifdef CONFIG_PREEMPT_RT_BASE -+static -+#endif - void __put_task_struct(struct task_struct *tsk) - { - WARN_ON(!tsk->exit_state); -@@ -270,7 +272,18 @@ void __put_task_struct(struct task_struct *tsk) - if (!profile_handoff_task(tsk)) - free_task(tsk); - } -+#ifndef CONFIG_PREEMPT_RT_BASE - EXPORT_SYMBOL_GPL(__put_task_struct); -+#else -+void __put_task_struct_cb(struct rcu_head *rhp) -+{ -+ struct task_struct *tsk = container_of(rhp, struct task_struct, put_rcu); -+ -+ __put_task_struct(tsk); -+ -+} -+EXPORT_SYMBOL_GPL(__put_task_struct_cb); -+#endif - - void __init __weak arch_task_cache_init(void) { } - -@@ -699,6 +712,19 @@ void __mmdrop(struct mm_struct *mm) - } - EXPORT_SYMBOL_GPL(__mmdrop); - -+#ifdef CONFIG_PREEMPT_RT_BASE -+/* -+ * RCU callback for delayed mm drop. Not strictly rcu, but we don't -+ * want another facility to make this work. -+ */ -+void __mmdrop_delayed(struct rcu_head *rhp) -+{ -+ struct mm_struct *mm = container_of(rhp, struct mm_struct, delayed_drop); -+ -+ __mmdrop(mm); -+} -+#endif -+ - /* - * Decrement the use count and release all resources for an mm. - */ -@@ -1228,6 +1254,9 @@ static void rt_mutex_init_task(struct task_struct *p) - */ - static void posix_cpu_timers_init(struct task_struct *tsk) - { -+#ifdef CONFIG_PREEMPT_RT_BASE -+ tsk->posix_timer_list = NULL; -+#endif - tsk->cputime_expires.prof_exp = 0; - tsk->cputime_expires.virt_exp = 0; - tsk->cputime_expires.sched_exp = 0; -@@ -1352,6 +1381,7 @@ static struct task_struct *copy_process(unsigned long clone_flags, - spin_lock_init(&p->alloc_lock); - - init_sigpending(&p->pending); -+ p->sigqueue_cache = NULL; - - p->utime = p->stime = p->gtime = 0; - p->utimescaled = p->stimescaled = 0; -diff --git a/kernel/futex.c b/kernel/futex.c -index 6555d5459e98..2d572edcac53 100644 ---- a/kernel/futex.c -+++ b/kernel/futex.c -@@ -874,7 +874,9 @@ void exit_pi_state_list(struct task_struct *curr) - * task still owns the PI-state: - */ - if (head->next != next) { -+ raw_spin_unlock_irq(&curr->pi_lock); - spin_unlock(&hb->lock); -+ raw_spin_lock_irq(&curr->pi_lock); - continue; - } - -@@ -1269,6 +1271,7 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this, - struct futex_pi_state *pi_state = this->pi_state; - u32 uninitialized_var(curval), newval; - WAKE_Q(wake_q); -+ WAKE_Q(wake_sleeper_q); - bool deboost; - int ret = 0; - -@@ -1335,7 +1338,8 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this, - - raw_spin_unlock_irq(&pi_state->pi_mutex.wait_lock); - -- deboost = rt_mutex_futex_unlock(&pi_state->pi_mutex, &wake_q); -+ deboost = rt_mutex_futex_unlock(&pi_state->pi_mutex, &wake_q, -+ &wake_sleeper_q); - - /* - * First unlock HB so the waiter does not spin on it once he got woken -@@ -1345,6 +1349,7 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this, - */ - spin_unlock(&hb->lock); - wake_up_q(&wake_q); -+ wake_up_q_sleeper(&wake_sleeper_q); - if (deboost) - rt_mutex_adjust_prio(current); - -@@ -1894,6 +1899,16 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags, - requeue_pi_wake_futex(this, &key2, hb2); - drop_count++; - continue; -+ } else if (ret == -EAGAIN) { -+ /* -+ * Waiter was woken by timeout or -+ * signal and has set pi_blocked_on to -+ * PI_WAKEUP_INPROGRESS before we -+ * tried to enqueue it on the rtmutex. -+ */ -+ this->pi_state = NULL; -+ put_pi_state(pi_state); -+ continue; - } else if (ret) { - /* - * rt_mutex_start_proxy_lock() detected a -@@ -2784,7 +2799,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags, - struct hrtimer_sleeper timeout, *to = NULL; - struct rt_mutex_waiter rt_waiter; - struct rt_mutex *pi_mutex = NULL; -- struct futex_hash_bucket *hb; -+ struct futex_hash_bucket *hb, *hb2; - union futex_key key2 = FUTEX_KEY_INIT; - struct futex_q q = futex_q_init; - int res, ret; -@@ -2809,10 +2824,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags, - * The waiter is allocated on our stack, manipulated by the requeue - * code while we sleep on uaddr. - */ -- debug_rt_mutex_init_waiter(&rt_waiter); -- RB_CLEAR_NODE(&rt_waiter.pi_tree_entry); -- RB_CLEAR_NODE(&rt_waiter.tree_entry); -- rt_waiter.task = NULL; -+ rt_mutex_init_waiter(&rt_waiter, false); - - ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, VERIFY_WRITE); - if (unlikely(ret != 0)) -@@ -2843,20 +2855,55 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags, - /* Queue the futex_q, drop the hb lock, wait for wakeup. */ - futex_wait_queue_me(hb, &q, to); - -- spin_lock(&hb->lock); -- ret = handle_early_requeue_pi_wakeup(hb, &q, &key2, to); -- spin_unlock(&hb->lock); -- if (ret) -- goto out_put_keys; -+ /* -+ * On RT we must avoid races with requeue and trying to block -+ * on two mutexes (hb->lock and uaddr2's rtmutex) by -+ * serializing access to pi_blocked_on with pi_lock. -+ */ -+ raw_spin_lock_irq(¤t->pi_lock); -+ if (current->pi_blocked_on) { -+ /* -+ * We have been requeued or are in the process of -+ * being requeued. -+ */ -+ raw_spin_unlock_irq(¤t->pi_lock); -+ } else { -+ /* -+ * Setting pi_blocked_on to PI_WAKEUP_INPROGRESS -+ * prevents a concurrent requeue from moving us to the -+ * uaddr2 rtmutex. After that we can safely acquire -+ * (and possibly block on) hb->lock. -+ */ -+ current->pi_blocked_on = PI_WAKEUP_INPROGRESS; -+ raw_spin_unlock_irq(¤t->pi_lock); -+ -+ spin_lock(&hb->lock); -+ -+ /* -+ * Clean up pi_blocked_on. We might leak it otherwise -+ * when we succeeded with the hb->lock in the fast -+ * path. -+ */ -+ raw_spin_lock_irq(¤t->pi_lock); -+ current->pi_blocked_on = NULL; -+ raw_spin_unlock_irq(¤t->pi_lock); -+ -+ ret = handle_early_requeue_pi_wakeup(hb, &q, &key2, to); -+ spin_unlock(&hb->lock); -+ if (ret) -+ goto out_put_keys; -+ } - - /* -- * In order for us to be here, we know our q.key == key2, and since -- * we took the hb->lock above, we also know that futex_requeue() has -- * completed and we no longer have to concern ourselves with a wakeup -- * race with the atomic proxy lock acquisition by the requeue code. The -- * futex_requeue dropped our key1 reference and incremented our key2 -- * reference count. -+ * In order to be here, we have either been requeued, are in -+ * the process of being requeued, or requeue successfully -+ * acquired uaddr2 on our behalf. If pi_blocked_on was -+ * non-null above, we may be racing with a requeue. Do not -+ * rely on q->lock_ptr to be hb2->lock until after blocking on -+ * hb->lock or hb2->lock. The futex_requeue dropped our key1 -+ * reference and incremented our key2 reference count. - */ -+ hb2 = hash_futex(&key2); - - /* Check if the requeue code acquired the second futex for us. */ - if (!q.rt_waiter) { -@@ -2865,14 +2912,15 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags, - * did a lock-steal - fix up the PI-state in that case. - */ - if (q.pi_state && (q.pi_state->owner != current)) { -- spin_lock(q.lock_ptr); -+ spin_lock(&hb2->lock); -+ BUG_ON(&hb2->lock != q.lock_ptr); - ret = fixup_pi_state_owner(uaddr2, &q, current); - /* - * Drop the reference to the pi state which - * the requeue_pi() code acquired for us. - */ - put_pi_state(q.pi_state); -- spin_unlock(q.lock_ptr); -+ spin_unlock(&hb2->lock); - } - } else { - /* -@@ -2885,7 +2933,8 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags, - ret = rt_mutex_finish_proxy_lock(pi_mutex, to, &rt_waiter); - debug_rt_mutex_free_waiter(&rt_waiter); - -- spin_lock(q.lock_ptr); -+ spin_lock(&hb2->lock); -+ BUG_ON(&hb2->lock != q.lock_ptr); - /* - * Fixup the pi_state owner and possibly acquire the lock if we - * haven't already. -diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c -index a15b5485b446..28c39c16f989 100644 ---- a/kernel/irq/handle.c -+++ b/kernel/irq/handle.c -@@ -134,6 +134,8 @@ void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action) - - irqreturn_t handle_irq_event_percpu(struct irq_desc *desc) - { -+ struct pt_regs *regs = get_irq_regs(); -+ u64 ip = regs ? instruction_pointer(regs) : 0; - irqreturn_t retval = IRQ_NONE; - unsigned int flags = 0, irq = desc->irq_data.irq; - struct irqaction *action; -@@ -174,7 +176,11 @@ irqreturn_t handle_irq_event_percpu(struct irq_desc *desc) - retval |= res; - } - -- add_interrupt_randomness(irq, flags); -+#ifdef CONFIG_PREEMPT_RT_FULL -+ desc->random_ip = ip; -+#else -+ add_interrupt_randomness(irq, flags, ip); -+#endif - - if (!noirqdebug) - note_interrupt(desc, retval); -diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c -index cc1cc641d653..f5e9fd5408d6 100644 ---- a/kernel/irq/manage.c -+++ b/kernel/irq/manage.c -@@ -22,6 +22,7 @@ - #include "internals.h" - - #ifdef CONFIG_IRQ_FORCED_THREADING -+# ifndef CONFIG_PREEMPT_RT_BASE - __read_mostly bool force_irqthreads; - - static int __init setup_forced_irqthreads(char *arg) -@@ -30,6 +31,7 @@ static int __init setup_forced_irqthreads(char *arg) - return 0; - } - early_param("threadirqs", setup_forced_irqthreads); -+# endif - #endif - - static void __synchronize_hardirq(struct irq_desc *desc) -@@ -179,6 +181,62 @@ static inline void - irq_get_pending(struct cpumask *mask, struct irq_desc *desc) { } - #endif - -+#ifdef CONFIG_PREEMPT_RT_FULL -+static void _irq_affinity_notify(struct irq_affinity_notify *notify); -+static struct task_struct *set_affinity_helper; -+static LIST_HEAD(affinity_list); -+static DEFINE_RAW_SPINLOCK(affinity_list_lock); -+ -+static int set_affinity_thread(void *unused) -+{ -+ while (1) { -+ struct irq_affinity_notify *notify; -+ int empty; -+ -+ set_current_state(TASK_INTERRUPTIBLE); -+ -+ raw_spin_lock_irq(&affinity_list_lock); -+ empty = list_empty(&affinity_list); -+ raw_spin_unlock_irq(&affinity_list_lock); -+ -+ if (empty) -+ schedule(); -+ if (kthread_should_stop()) -+ break; -+ set_current_state(TASK_RUNNING); -+try_next: -+ notify = NULL; -+ -+ raw_spin_lock_irq(&affinity_list_lock); -+ if (!list_empty(&affinity_list)) { -+ notify = list_first_entry(&affinity_list, -+ struct irq_affinity_notify, list); -+ list_del_init(¬ify->list); -+ } -+ raw_spin_unlock_irq(&affinity_list_lock); -+ -+ if (!notify) -+ continue; -+ _irq_affinity_notify(notify); -+ goto try_next; -+ } -+ return 0; -+} -+ -+static void init_helper_thread(void) -+{ -+ if (set_affinity_helper) -+ return; -+ set_affinity_helper = kthread_run(set_affinity_thread, NULL, -+ "affinity-cb"); -+ WARN_ON(IS_ERR(set_affinity_helper)); -+} -+#else -+ -+static inline void init_helper_thread(void) { } -+ -+#endif -+ - int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask, - bool force) - { -@@ -218,7 +276,17 @@ int irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask, - - if (desc->affinity_notify) { - kref_get(&desc->affinity_notify->kref); -+ -+#ifdef CONFIG_PREEMPT_RT_FULL -+ raw_spin_lock(&affinity_list_lock); -+ if (list_empty(&desc->affinity_notify->list)) -+ list_add_tail(&affinity_list, -+ &desc->affinity_notify->list); -+ raw_spin_unlock(&affinity_list_lock); -+ wake_up_process(set_affinity_helper); -+#else - schedule_work(&desc->affinity_notify->work); -+#endif - } - irqd_set(data, IRQD_AFFINITY_SET); - -@@ -256,10 +324,8 @@ int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m) - } - EXPORT_SYMBOL_GPL(irq_set_affinity_hint); - --static void irq_affinity_notify(struct work_struct *work) -+static void _irq_affinity_notify(struct irq_affinity_notify *notify) - { -- struct irq_affinity_notify *notify = -- container_of(work, struct irq_affinity_notify, work); - struct irq_desc *desc = irq_to_desc(notify->irq); - cpumask_var_t cpumask; - unsigned long flags; -@@ -281,6 +347,13 @@ static void irq_affinity_notify(struct work_struct *work) - kref_put(¬ify->kref, notify->release); - } - -+static void irq_affinity_notify(struct work_struct *work) -+{ -+ struct irq_affinity_notify *notify = -+ container_of(work, struct irq_affinity_notify, work); -+ _irq_affinity_notify(notify); -+} -+ - /** - * irq_set_affinity_notifier - control notification of IRQ affinity changes - * @irq: Interrupt for which to enable/disable notification -@@ -310,6 +383,8 @@ irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify) - notify->irq = irq; - kref_init(¬ify->kref); - INIT_WORK(¬ify->work, irq_affinity_notify); -+ INIT_LIST_HEAD(¬ify->list); -+ init_helper_thread(); - } - - raw_spin_lock_irqsave(&desc->lock, flags); -@@ -863,7 +938,15 @@ irq_forced_thread_fn(struct irq_desc *desc, struct irqaction *action) - local_bh_disable(); - ret = action->thread_fn(action->irq, action->dev_id); - irq_finalize_oneshot(desc, action); -- local_bh_enable(); -+ /* -+ * Interrupts which have real time requirements can be set up -+ * to avoid softirq processing in the thread handler. This is -+ * safe as these interrupts do not raise soft interrupts. -+ */ -+ if (irq_settings_no_softirq_call(desc)) -+ _local_bh_enable(); -+ else -+ local_bh_enable(); - return ret; - } - -@@ -960,6 +1043,12 @@ static int irq_thread(void *data) - if (action_ret == IRQ_WAKE_THREAD) - irq_wake_secondary(desc, action); - -+#ifdef CONFIG_PREEMPT_RT_FULL -+ migrate_disable(); -+ add_interrupt_randomness(action->irq, 0, -+ desc->random_ip ^ (unsigned long) action); -+ migrate_enable(); -+#endif - wake_threads_waitq(desc); - } - -@@ -1313,6 +1402,9 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) - irqd_set(&desc->irq_data, IRQD_NO_BALANCING); - } - -+ if (new->flags & IRQF_NO_SOFTIRQ_CALL) -+ irq_settings_set_no_softirq_call(desc); -+ - /* Set default affinity mask once everything is setup */ - setup_affinity(desc, mask); - -@@ -1998,7 +2090,7 @@ EXPORT_SYMBOL_GPL(irq_get_irqchip_state); - * This call sets the internal irqchip state of an interrupt, - * depending on the value of @which. - * -- * This function should be called with preemption disabled if the -+ * This function should be called with migration disabled if the - * interrupt controller has per-cpu registers. - */ - int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which, -diff --git a/kernel/irq/settings.h b/kernel/irq/settings.h -index 320579d89091..2df2d4445b1e 100644 ---- a/kernel/irq/settings.h -+++ b/kernel/irq/settings.h -@@ -16,6 +16,7 @@ enum { - _IRQ_PER_CPU_DEVID = IRQ_PER_CPU_DEVID, - _IRQ_IS_POLLED = IRQ_IS_POLLED, - _IRQ_DISABLE_UNLAZY = IRQ_DISABLE_UNLAZY, -+ _IRQ_NO_SOFTIRQ_CALL = IRQ_NO_SOFTIRQ_CALL, - _IRQF_MODIFY_MASK = IRQF_MODIFY_MASK, - }; - -@@ -30,6 +31,7 @@ enum { - #define IRQ_PER_CPU_DEVID GOT_YOU_MORON - #define IRQ_IS_POLLED GOT_YOU_MORON - #define IRQ_DISABLE_UNLAZY GOT_YOU_MORON -+#define IRQ_NO_SOFTIRQ_CALL GOT_YOU_MORON - #undef IRQF_MODIFY_MASK - #define IRQF_MODIFY_MASK GOT_YOU_MORON - -@@ -40,6 +42,16 @@ irq_settings_clr_and_set(struct irq_desc *desc, u32 clr, u32 set) - desc->status_use_accessors |= (set & _IRQF_MODIFY_MASK); - } - -+static inline bool irq_settings_no_softirq_call(struct irq_desc *desc) -+{ -+ return desc->status_use_accessors & _IRQ_NO_SOFTIRQ_CALL; -+} -+ -+static inline void irq_settings_set_no_softirq_call(struct irq_desc *desc) -+{ -+ desc->status_use_accessors |= _IRQ_NO_SOFTIRQ_CALL; -+} -+ - static inline bool irq_settings_is_per_cpu(struct irq_desc *desc) - { - return desc->status_use_accessors & _IRQ_PER_CPU; -diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c -index 5707f97a3e6a..73f38dc7a7fb 100644 ---- a/kernel/irq/spurious.c -+++ b/kernel/irq/spurious.c -@@ -442,6 +442,10 @@ MODULE_PARM_DESC(noirqdebug, "Disable irq lockup detection when true"); - - static int __init irqfixup_setup(char *str) - { -+#ifdef CONFIG_PREEMPT_RT_BASE -+ pr_warn("irqfixup boot option not supported w/ CONFIG_PREEMPT_RT_BASE\n"); -+ return 1; -+#endif - irqfixup = 1; - printk(KERN_WARNING "Misrouted IRQ fixup support enabled.\n"); - printk(KERN_WARNING "This may impact system performance.\n"); -@@ -454,6 +458,10 @@ module_param(irqfixup, int, 0644); - - static int __init irqpoll_setup(char *str) - { -+#ifdef CONFIG_PREEMPT_RT_BASE -+ pr_warn("irqpoll boot option not supported w/ CONFIG_PREEMPT_RT_BASE\n"); -+ return 1; -+#endif - irqfixup = 2; - printk(KERN_WARNING "Misrouted IRQ fixup and polling support " - "enabled\n"); -diff --git a/kernel/irq_work.c b/kernel/irq_work.c -index bcf107ce0854..2899ba0d23d1 100644 ---- a/kernel/irq_work.c -+++ b/kernel/irq_work.c -@@ -17,6 +17,7 @@ - #include <linux/cpu.h> - #include <linux/notifier.h> - #include <linux/smp.h> -+#include <linux/interrupt.h> - #include <asm/processor.h> - - -@@ -65,6 +66,8 @@ void __weak arch_irq_work_raise(void) - */ - bool irq_work_queue_on(struct irq_work *work, int cpu) - { -+ struct llist_head *list; -+ - /* All work should have been flushed before going offline */ - WARN_ON_ONCE(cpu_is_offline(cpu)); - -@@ -75,7 +78,12 @@ bool irq_work_queue_on(struct irq_work *work, int cpu) - if (!irq_work_claim(work)) - return false; - -- if (llist_add(&work->llnode, &per_cpu(raised_list, cpu))) -+ if (IS_ENABLED(CONFIG_PREEMPT_RT_FULL) && !(work->flags & IRQ_WORK_HARD_IRQ)) -+ list = &per_cpu(lazy_list, cpu); -+ else -+ list = &per_cpu(raised_list, cpu); -+ -+ if (llist_add(&work->llnode, list)) - arch_send_call_function_single_ipi(cpu); - - return true; -@@ -86,6 +94,9 @@ EXPORT_SYMBOL_GPL(irq_work_queue_on); - /* Enqueue the irq work @work on the current CPU */ - bool irq_work_queue(struct irq_work *work) - { -+ struct llist_head *list; -+ bool lazy_work, realtime = IS_ENABLED(CONFIG_PREEMPT_RT_FULL); -+ - /* Only queue if not already pending */ - if (!irq_work_claim(work)) - return false; -@@ -93,13 +104,15 @@ bool irq_work_queue(struct irq_work *work) - /* Queue the entry and raise the IPI if needed. */ - preempt_disable(); - -- /* If the work is "lazy", handle it from next tick if any */ -- if (work->flags & IRQ_WORK_LAZY) { -- if (llist_add(&work->llnode, this_cpu_ptr(&lazy_list)) && -- tick_nohz_tick_stopped()) -- arch_irq_work_raise(); -- } else { -- if (llist_add(&work->llnode, this_cpu_ptr(&raised_list))) -+ lazy_work = work->flags & IRQ_WORK_LAZY; -+ -+ if (lazy_work || (realtime && !(work->flags & IRQ_WORK_HARD_IRQ))) -+ list = this_cpu_ptr(&lazy_list); -+ else -+ list = this_cpu_ptr(&raised_list); -+ -+ if (llist_add(&work->llnode, list)) { -+ if (!lazy_work || tick_nohz_tick_stopped()) - arch_irq_work_raise(); - } - -@@ -116,9 +129,8 @@ bool irq_work_needs_cpu(void) - raised = this_cpu_ptr(&raised_list); - lazy = this_cpu_ptr(&lazy_list); - -- if (llist_empty(raised) || arch_irq_work_has_interrupt()) -- if (llist_empty(lazy)) -- return false; -+ if (llist_empty(raised) && llist_empty(lazy)) -+ return false; - - /* All work should have been flushed before going offline */ - WARN_ON_ONCE(cpu_is_offline(smp_processor_id())); -@@ -132,7 +144,7 @@ static void irq_work_run_list(struct llist_head *list) - struct irq_work *work; - struct llist_node *llnode; - -- BUG_ON(!irqs_disabled()); -+ BUG_ON_NONRT(!irqs_disabled()); - - if (llist_empty(list)) - return; -@@ -169,7 +181,16 @@ static void irq_work_run_list(struct llist_head *list) - void irq_work_run(void) - { - irq_work_run_list(this_cpu_ptr(&raised_list)); -- irq_work_run_list(this_cpu_ptr(&lazy_list)); -+ if (IS_ENABLED(CONFIG_PREEMPT_RT_FULL)) { -+ /* -+ * NOTE: we raise softirq via IPI for safety, -+ * and execute in irq_work_tick() to move the -+ * overhead from hard to soft irq context. -+ */ -+ if (!llist_empty(this_cpu_ptr(&lazy_list))) -+ raise_softirq(TIMER_SOFTIRQ); -+ } else -+ irq_work_run_list(this_cpu_ptr(&lazy_list)); - } - EXPORT_SYMBOL_GPL(irq_work_run); - -@@ -179,8 +200,17 @@ void irq_work_tick(void) - - if (!llist_empty(raised) && !arch_irq_work_has_interrupt()) - irq_work_run_list(raised); -+ -+ if (!IS_ENABLED(CONFIG_PREEMPT_RT_FULL)) -+ irq_work_run_list(this_cpu_ptr(&lazy_list)); -+} -+ -+#if defined(CONFIG_IRQ_WORK) && defined(CONFIG_PREEMPT_RT_FULL) -+void irq_work_tick_soft(void) -+{ - irq_work_run_list(this_cpu_ptr(&lazy_list)); - } -+#endif - - /* - * Synchronize against the irq_work @entry, ensures the entry is not -diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c -index 152da4a48867..9fe46356ed47 100644 ---- a/kernel/ksysfs.c -+++ b/kernel/ksysfs.c -@@ -136,6 +136,15 @@ KERNEL_ATTR_RO(vmcoreinfo); - - #endif /* CONFIG_KEXEC_CORE */ - -+#if defined(CONFIG_PREEMPT_RT_FULL) -+static ssize_t realtime_show(struct kobject *kobj, -+ struct kobj_attribute *attr, char *buf) -+{ -+ return sprintf(buf, "%d\n", 1); -+} -+KERNEL_ATTR_RO(realtime); -+#endif -+ - /* whether file capabilities are enabled */ - static ssize_t fscaps_show(struct kobject *kobj, - struct kobj_attribute *attr, char *buf) -@@ -225,6 +234,9 @@ static struct attribute * kernel_attrs[] = { - &rcu_expedited_attr.attr, - &rcu_normal_attr.attr, - #endif -+#ifdef CONFIG_PREEMPT_RT_FULL -+ &realtime_attr.attr, -+#endif - NULL - }; - -diff --git a/kernel/locking/Makefile b/kernel/locking/Makefile -index 31322a4275cd..c6bba9299d8b 100644 ---- a/kernel/locking/Makefile -+++ b/kernel/locking/Makefile -@@ -2,7 +2,7 @@ - # and is generally not a function of system call inputs. - KCOV_INSTRUMENT := n - --obj-y += mutex.o semaphore.o rwsem.o percpu-rwsem.o -+obj-y += semaphore.o percpu-rwsem.o - - ifdef CONFIG_FUNCTION_TRACER - CFLAGS_REMOVE_lockdep.o = $(CC_FLAGS_FTRACE) -@@ -11,7 +11,11 @@ CFLAGS_REMOVE_mutex-debug.o = $(CC_FLAGS_FTRACE) - CFLAGS_REMOVE_rtmutex-debug.o = $(CC_FLAGS_FTRACE) - endif - -+ifneq ($(CONFIG_PREEMPT_RT_FULL),y) -+obj-y += mutex.o - obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o -+obj-y += rwsem.o -+endif - obj-$(CONFIG_LOCKDEP) += lockdep.o - ifeq ($(CONFIG_PROC_FS),y) - obj-$(CONFIG_LOCKDEP) += lockdep_proc.o -@@ -25,7 +29,10 @@ obj-$(CONFIG_RT_MUTEXES) += rtmutex.o - obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o - obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o - obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o -+ifneq ($(CONFIG_PREEMPT_RT_FULL),y) - obj-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o - obj-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem-xadd.o -+endif -+obj-$(CONFIG_PREEMPT_RT_FULL) += rt.o - obj-$(CONFIG_QUEUED_RWLOCKS) += qrwlock.o - obj-$(CONFIG_LOCK_TORTURE_TEST) += locktorture.o -diff --git a/kernel/locking/lglock.c b/kernel/locking/lglock.c -index 951cfcd10b4a..57e0ea72c28a 100644 ---- a/kernel/locking/lglock.c -+++ b/kernel/locking/lglock.c -@@ -4,6 +4,15 @@ - #include <linux/cpu.h> - #include <linux/string.h> - -+#ifndef CONFIG_PREEMPT_RT_FULL -+# define lg_lock_ptr arch_spinlock_t -+# define lg_do_lock(l) arch_spin_lock(l) -+# define lg_do_unlock(l) arch_spin_unlock(l) -+#else -+# define lg_lock_ptr struct rt_mutex -+# define lg_do_lock(l) __rt_spin_lock__no_mg(l) -+# define lg_do_unlock(l) __rt_spin_unlock(l) -+#endif - /* - * Note there is no uninit, so lglocks cannot be defined in - * modules (but it's fine to use them from there) -@@ -12,51 +21,60 @@ - - void lg_lock_init(struct lglock *lg, char *name) - { -+#ifdef CONFIG_PREEMPT_RT_FULL -+ int i; -+ -+ for_each_possible_cpu(i) { -+ struct rt_mutex *lock = per_cpu_ptr(lg->lock, i); -+ -+ rt_mutex_init(lock); -+ } -+#endif - LOCKDEP_INIT_MAP(&lg->lock_dep_map, name, &lg->lock_key, 0); - } - EXPORT_SYMBOL(lg_lock_init); - - void lg_local_lock(struct lglock *lg) - { -- arch_spinlock_t *lock; -+ lg_lock_ptr *lock; - -- preempt_disable(); -+ migrate_disable(); - lock_acquire_shared(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_); - lock = this_cpu_ptr(lg->lock); -- arch_spin_lock(lock); -+ lg_do_lock(lock); - } - EXPORT_SYMBOL(lg_local_lock); - - void lg_local_unlock(struct lglock *lg) - { -- arch_spinlock_t *lock; -+ lg_lock_ptr *lock; - - lock_release(&lg->lock_dep_map, 1, _RET_IP_); - lock = this_cpu_ptr(lg->lock); -- arch_spin_unlock(lock); -- preempt_enable(); -+ lg_do_unlock(lock); -+ migrate_enable(); - } - EXPORT_SYMBOL(lg_local_unlock); - - void lg_local_lock_cpu(struct lglock *lg, int cpu) - { -- arch_spinlock_t *lock; -+ lg_lock_ptr *lock; - -- preempt_disable(); -+ preempt_disable_nort(); - lock_acquire_shared(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_); - lock = per_cpu_ptr(lg->lock, cpu); -- arch_spin_lock(lock); -+ lg_do_lock(lock); - } - EXPORT_SYMBOL(lg_local_lock_cpu); - - void lg_local_unlock_cpu(struct lglock *lg, int cpu) - { -- arch_spinlock_t *lock; -+ lg_lock_ptr *lock; - - lock_release(&lg->lock_dep_map, 1, _RET_IP_); - lock = per_cpu_ptr(lg->lock, cpu); -- arch_spin_unlock(lock); -- preempt_enable(); -+ lg_do_unlock(lock); -+ preempt_enable_nort(); - } - EXPORT_SYMBOL(lg_local_unlock_cpu); - -@@ -68,30 +86,30 @@ void lg_double_lock(struct lglock *lg, int cpu1, int cpu2) - if (cpu2 < cpu1) - swap(cpu1, cpu2); - -- preempt_disable(); -+ preempt_disable_nort(); - lock_acquire_shared(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_); -- arch_spin_lock(per_cpu_ptr(lg->lock, cpu1)); -- arch_spin_lock(per_cpu_ptr(lg->lock, cpu2)); -+ lg_do_lock(per_cpu_ptr(lg->lock, cpu1)); -+ lg_do_lock(per_cpu_ptr(lg->lock, cpu2)); - } - - void lg_double_unlock(struct lglock *lg, int cpu1, int cpu2) - { - lock_release(&lg->lock_dep_map, 1, _RET_IP_); -- arch_spin_unlock(per_cpu_ptr(lg->lock, cpu1)); -- arch_spin_unlock(per_cpu_ptr(lg->lock, cpu2)); -- preempt_enable(); -+ lg_do_unlock(per_cpu_ptr(lg->lock, cpu1)); -+ lg_do_unlock(per_cpu_ptr(lg->lock, cpu2)); -+ preempt_enable_nort(); - } - - void lg_global_lock(struct lglock *lg) - { - int i; - -- preempt_disable(); -+ preempt_disable_nort(); - lock_acquire_exclusive(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_); - for_each_possible_cpu(i) { -- arch_spinlock_t *lock; -+ lg_lock_ptr *lock; - lock = per_cpu_ptr(lg->lock, i); -- arch_spin_lock(lock); -+ lg_do_lock(lock); - } - } - EXPORT_SYMBOL(lg_global_lock); -@@ -102,10 +120,35 @@ void lg_global_unlock(struct lglock *lg) - - lock_release(&lg->lock_dep_map, 1, _RET_IP_); - for_each_possible_cpu(i) { -- arch_spinlock_t *lock; -+ lg_lock_ptr *lock; - lock = per_cpu_ptr(lg->lock, i); -- arch_spin_unlock(lock); -+ lg_do_unlock(lock); - } -- preempt_enable(); -+ preempt_enable_nort(); - } - EXPORT_SYMBOL(lg_global_unlock); -+ -+#ifdef CONFIG_PREEMPT_RT_FULL -+/* -+ * HACK: If you use this, you get to keep the pieces. -+ * Used in queue_stop_cpus_work() when stop machinery -+ * is called from inactive CPU, so we can't schedule. -+ */ -+# define lg_do_trylock_relax(l) \ -+ do { \ -+ while (!__rt_spin_trylock(l)) \ -+ cpu_relax(); \ -+ } while (0) -+ -+void lg_global_trylock_relax(struct lglock *lg) -+{ -+ int i; -+ -+ lock_acquire_exclusive(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_); -+ for_each_possible_cpu(i) { -+ lg_lock_ptr *lock; -+ lock = per_cpu_ptr(lg->lock, i); -+ lg_do_trylock_relax(lock); -+ } -+} -+#endif -diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c -index 78c1c0ee6dc1..839175acc1c6 100644 ---- a/kernel/locking/lockdep.c -+++ b/kernel/locking/lockdep.c -@@ -3648,6 +3648,7 @@ static void check_flags(unsigned long flags) - } - } - -+#ifndef CONFIG_PREEMPT_RT_FULL - /* - * We dont accurately track softirq state in e.g. - * hardirq contexts (such as on 4KSTACKS), so only -@@ -3662,6 +3663,7 @@ static void check_flags(unsigned long flags) - DEBUG_LOCKS_WARN_ON(!current->softirqs_enabled); - } - } -+#endif - - if (!debug_locks) - print_irqtrace_events(current); -diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c -index 8ef1919d63b2..291fc19e28e0 100644 ---- a/kernel/locking/locktorture.c -+++ b/kernel/locking/locktorture.c -@@ -26,7 +26,6 @@ - #include <linux/kthread.h> - #include <linux/sched/rt.h> - #include <linux/spinlock.h> --#include <linux/rwlock.h> - #include <linux/mutex.h> - #include <linux/rwsem.h> - #include <linux/smp.h> -diff --git a/kernel/locking/rt.c b/kernel/locking/rt.c -new file mode 100644 -index 000000000000..d4ab61c1848b ---- /dev/null -+++ b/kernel/locking/rt.c -@@ -0,0 +1,474 @@ -+/* -+ * kernel/rt.c -+ * -+ * Real-Time Preemption Support -+ * -+ * started by Ingo Molnar: -+ * -+ * Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> -+ * Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com> -+ * -+ * historic credit for proving that Linux spinlocks can be implemented via -+ * RT-aware mutexes goes to many people: The Pmutex project (Dirk Grambow -+ * and others) who prototyped it on 2.4 and did lots of comparative -+ * research and analysis; TimeSys, for proving that you can implement a -+ * fully preemptible kernel via the use of IRQ threading and mutexes; -+ * Bill Huey for persuasively arguing on lkml that the mutex model is the -+ * right one; and to MontaVista, who ported pmutexes to 2.6. -+ * -+ * This code is a from-scratch implementation and is not based on pmutexes, -+ * but the idea of converting spinlocks to mutexes is used here too. -+ * -+ * lock debugging, locking tree, deadlock detection: -+ * -+ * Copyright (C) 2004, LynuxWorks, Inc., Igor Manyilov, Bill Huey -+ * Released under the General Public License (GPL). -+ * -+ * Includes portions of the generic R/W semaphore implementation from: -+ * -+ * Copyright (c) 2001 David Howells (dhowells@redhat.com). -+ * - Derived partially from idea by Andrea Arcangeli <andrea@suse.de> -+ * - Derived also from comments by Linus -+ * -+ * Pending ownership of locks and ownership stealing: -+ * -+ * Copyright (C) 2005, Kihon Technologies Inc., Steven Rostedt -+ * -+ * (also by Steven Rostedt) -+ * - Converted single pi_lock to individual task locks. -+ * -+ * By Esben Nielsen: -+ * Doing priority inheritance with help of the scheduler. -+ * -+ * Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com> -+ * - major rework based on Esben Nielsens initial patch -+ * - replaced thread_info references by task_struct refs -+ * - removed task->pending_owner dependency -+ * - BKL drop/reacquire for semaphore style locks to avoid deadlocks -+ * in the scheduler return path as discussed with Steven Rostedt -+ * -+ * Copyright (C) 2006, Kihon Technologies Inc. -+ * Steven Rostedt <rostedt@goodmis.org> -+ * - debugged and patched Thomas Gleixner's rework. -+ * - added back the cmpxchg to the rework. -+ * - turned atomic require back on for SMP. -+ */ -+ -+#include <linux/spinlock.h> -+#include <linux/rtmutex.h> -+#include <linux/sched.h> -+#include <linux/delay.h> -+#include <linux/module.h> -+#include <linux/kallsyms.h> -+#include <linux/syscalls.h> -+#include <linux/interrupt.h> -+#include <linux/plist.h> -+#include <linux/fs.h> -+#include <linux/futex.h> -+#include <linux/hrtimer.h> -+ -+#include "rtmutex_common.h" -+ -+/* -+ * struct mutex functions -+ */ -+void __mutex_do_init(struct mutex *mutex, const char *name, -+ struct lock_class_key *key) -+{ -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+ /* -+ * Make sure we are not reinitializing a held lock: -+ */ -+ debug_check_no_locks_freed((void *)mutex, sizeof(*mutex)); -+ lockdep_init_map(&mutex->dep_map, name, key, 0); -+#endif -+ mutex->lock.save_state = 0; -+} -+EXPORT_SYMBOL(__mutex_do_init); -+ -+void __lockfunc _mutex_lock(struct mutex *lock) -+{ -+ mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_); -+ rt_mutex_lock(&lock->lock); -+} -+EXPORT_SYMBOL(_mutex_lock); -+ -+int __lockfunc _mutex_lock_interruptible(struct mutex *lock) -+{ -+ int ret; -+ -+ mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_); -+ ret = rt_mutex_lock_interruptible(&lock->lock); -+ if (ret) -+ mutex_release(&lock->dep_map, 1, _RET_IP_); -+ return ret; -+} -+EXPORT_SYMBOL(_mutex_lock_interruptible); -+ -+int __lockfunc _mutex_lock_killable(struct mutex *lock) -+{ -+ int ret; -+ -+ mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_); -+ ret = rt_mutex_lock_killable(&lock->lock); -+ if (ret) -+ mutex_release(&lock->dep_map, 1, _RET_IP_); -+ return ret; -+} -+EXPORT_SYMBOL(_mutex_lock_killable); -+ -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+void __lockfunc _mutex_lock_nested(struct mutex *lock, int subclass) -+{ -+ mutex_acquire_nest(&lock->dep_map, subclass, 0, NULL, _RET_IP_); -+ rt_mutex_lock(&lock->lock); -+} -+EXPORT_SYMBOL(_mutex_lock_nested); -+ -+void __lockfunc _mutex_lock_nest_lock(struct mutex *lock, struct lockdep_map *nest) -+{ -+ mutex_acquire_nest(&lock->dep_map, 0, 0, nest, _RET_IP_); -+ rt_mutex_lock(&lock->lock); -+} -+EXPORT_SYMBOL(_mutex_lock_nest_lock); -+ -+int __lockfunc _mutex_lock_interruptible_nested(struct mutex *lock, int subclass) -+{ -+ int ret; -+ -+ mutex_acquire_nest(&lock->dep_map, subclass, 0, NULL, _RET_IP_); -+ ret = rt_mutex_lock_interruptible(&lock->lock); -+ if (ret) -+ mutex_release(&lock->dep_map, 1, _RET_IP_); -+ return ret; -+} -+EXPORT_SYMBOL(_mutex_lock_interruptible_nested); -+ -+int __lockfunc _mutex_lock_killable_nested(struct mutex *lock, int subclass) -+{ -+ int ret; -+ -+ mutex_acquire(&lock->dep_map, subclass, 0, _RET_IP_); -+ ret = rt_mutex_lock_killable(&lock->lock); -+ if (ret) -+ mutex_release(&lock->dep_map, 1, _RET_IP_); -+ return ret; -+} -+EXPORT_SYMBOL(_mutex_lock_killable_nested); -+#endif -+ -+int __lockfunc _mutex_trylock(struct mutex *lock) -+{ -+ int ret = rt_mutex_trylock(&lock->lock); -+ -+ if (ret) -+ mutex_acquire(&lock->dep_map, 0, 1, _RET_IP_); -+ -+ return ret; -+} -+EXPORT_SYMBOL(_mutex_trylock); -+ -+void __lockfunc _mutex_unlock(struct mutex *lock) -+{ -+ mutex_release(&lock->dep_map, 1, _RET_IP_); -+ rt_mutex_unlock(&lock->lock); -+} -+EXPORT_SYMBOL(_mutex_unlock); -+ -+/* -+ * rwlock_t functions -+ */ -+int __lockfunc rt_write_trylock(rwlock_t *rwlock) -+{ -+ int ret; -+ -+ migrate_disable(); -+ ret = rt_mutex_trylock(&rwlock->lock); -+ if (ret) -+ rwlock_acquire(&rwlock->dep_map, 0, 1, _RET_IP_); -+ else -+ migrate_enable(); -+ -+ return ret; -+} -+EXPORT_SYMBOL(rt_write_trylock); -+ -+int __lockfunc rt_write_trylock_irqsave(rwlock_t *rwlock, unsigned long *flags) -+{ -+ int ret; -+ -+ *flags = 0; -+ ret = rt_write_trylock(rwlock); -+ return ret; -+} -+EXPORT_SYMBOL(rt_write_trylock_irqsave); -+ -+int __lockfunc rt_read_trylock(rwlock_t *rwlock) -+{ -+ struct rt_mutex *lock = &rwlock->lock; -+ int ret = 1; -+ -+ /* -+ * recursive read locks succeed when current owns the lock, -+ * but not when read_depth == 0 which means that the lock is -+ * write locked. -+ */ -+ if (rt_mutex_owner(lock) != current) { -+ migrate_disable(); -+ ret = rt_mutex_trylock(lock); -+ if (ret) -+ rwlock_acquire(&rwlock->dep_map, 0, 1, _RET_IP_); -+ else -+ migrate_enable(); -+ -+ } else if (!rwlock->read_depth) { -+ ret = 0; -+ } -+ -+ if (ret) -+ rwlock->read_depth++; -+ -+ return ret; -+} -+EXPORT_SYMBOL(rt_read_trylock); -+ -+void __lockfunc rt_write_lock(rwlock_t *rwlock) -+{ -+ rwlock_acquire(&rwlock->dep_map, 0, 0, _RET_IP_); -+ __rt_spin_lock(&rwlock->lock); -+} -+EXPORT_SYMBOL(rt_write_lock); -+ -+void __lockfunc rt_read_lock(rwlock_t *rwlock) -+{ -+ struct rt_mutex *lock = &rwlock->lock; -+ -+ -+ /* -+ * recursive read locks succeed when current owns the lock -+ */ -+ if (rt_mutex_owner(lock) != current) { -+ rwlock_acquire(&rwlock->dep_map, 0, 0, _RET_IP_); -+ __rt_spin_lock(lock); -+ } -+ rwlock->read_depth++; -+} -+ -+EXPORT_SYMBOL(rt_read_lock); -+ -+void __lockfunc rt_write_unlock(rwlock_t *rwlock) -+{ -+ /* NOTE: we always pass in '1' for nested, for simplicity */ -+ rwlock_release(&rwlock->dep_map, 1, _RET_IP_); -+ __rt_spin_unlock(&rwlock->lock); -+ migrate_enable(); -+} -+EXPORT_SYMBOL(rt_write_unlock); -+ -+void __lockfunc rt_read_unlock(rwlock_t *rwlock) -+{ -+ /* Release the lock only when read_depth is down to 0 */ -+ if (--rwlock->read_depth == 0) { -+ rwlock_release(&rwlock->dep_map, 1, _RET_IP_); -+ __rt_spin_unlock(&rwlock->lock); -+ migrate_enable(); -+ } -+} -+EXPORT_SYMBOL(rt_read_unlock); -+ -+unsigned long __lockfunc rt_write_lock_irqsave(rwlock_t *rwlock) -+{ -+ rt_write_lock(rwlock); -+ -+ return 0; -+} -+EXPORT_SYMBOL(rt_write_lock_irqsave); -+ -+unsigned long __lockfunc rt_read_lock_irqsave(rwlock_t *rwlock) -+{ -+ rt_read_lock(rwlock); -+ -+ return 0; -+} -+EXPORT_SYMBOL(rt_read_lock_irqsave); -+ -+void __rt_rwlock_init(rwlock_t *rwlock, char *name, struct lock_class_key *key) -+{ -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+ /* -+ * Make sure we are not reinitializing a held lock: -+ */ -+ debug_check_no_locks_freed((void *)rwlock, sizeof(*rwlock)); -+ lockdep_init_map(&rwlock->dep_map, name, key, 0); -+#endif -+ rwlock->lock.save_state = 1; -+ rwlock->read_depth = 0; -+} -+EXPORT_SYMBOL(__rt_rwlock_init); -+ -+/* -+ * rw_semaphores -+ */ -+ -+void rt_up_write(struct rw_semaphore *rwsem) -+{ -+ rwsem_release(&rwsem->dep_map, 1, _RET_IP_); -+ rt_mutex_unlock(&rwsem->lock); -+} -+EXPORT_SYMBOL(rt_up_write); -+ -+void __rt_up_read(struct rw_semaphore *rwsem) -+{ -+ if (--rwsem->read_depth == 0) -+ rt_mutex_unlock(&rwsem->lock); -+} -+ -+void rt_up_read(struct rw_semaphore *rwsem) -+{ -+ rwsem_release(&rwsem->dep_map, 1, _RET_IP_); -+ __rt_up_read(rwsem); -+} -+EXPORT_SYMBOL(rt_up_read); -+ -+/* -+ * downgrade a write lock into a read lock -+ * - just wake up any readers at the front of the queue -+ */ -+void rt_downgrade_write(struct rw_semaphore *rwsem) -+{ -+ BUG_ON(rt_mutex_owner(&rwsem->lock) != current); -+ rwsem->read_depth = 1; -+} -+EXPORT_SYMBOL(rt_downgrade_write); -+ -+int rt_down_write_trylock(struct rw_semaphore *rwsem) -+{ -+ int ret = rt_mutex_trylock(&rwsem->lock); -+ -+ if (ret) -+ rwsem_acquire(&rwsem->dep_map, 0, 1, _RET_IP_); -+ return ret; -+} -+EXPORT_SYMBOL(rt_down_write_trylock); -+ -+void rt_down_write(struct rw_semaphore *rwsem) -+{ -+ rwsem_acquire(&rwsem->dep_map, 0, 0, _RET_IP_); -+ rt_mutex_lock(&rwsem->lock); -+} -+EXPORT_SYMBOL(rt_down_write); -+ -+void rt_down_write_nested(struct rw_semaphore *rwsem, int subclass) -+{ -+ rwsem_acquire(&rwsem->dep_map, subclass, 0, _RET_IP_); -+ rt_mutex_lock(&rwsem->lock); -+} -+EXPORT_SYMBOL(rt_down_write_nested); -+ -+void rt_down_write_nested_lock(struct rw_semaphore *rwsem, -+ struct lockdep_map *nest) -+{ -+ rwsem_acquire_nest(&rwsem->dep_map, 0, 0, nest, _RET_IP_); -+ rt_mutex_lock(&rwsem->lock); -+} -+EXPORT_SYMBOL(rt_down_write_nested_lock); -+ -+int rt__down_read_trylock(struct rw_semaphore *rwsem) -+{ -+ struct rt_mutex *lock = &rwsem->lock; -+ int ret = 1; -+ -+ /* -+ * recursive read locks succeed when current owns the rwsem, -+ * but not when read_depth == 0 which means that the rwsem is -+ * write locked. -+ */ -+ if (rt_mutex_owner(lock) != current) -+ ret = rt_mutex_trylock(&rwsem->lock); -+ else if (!rwsem->read_depth) -+ ret = 0; -+ -+ if (ret) -+ rwsem->read_depth++; -+ return ret; -+ -+} -+ -+int rt_down_read_trylock(struct rw_semaphore *rwsem) -+{ -+ int ret; -+ -+ ret = rt__down_read_trylock(rwsem); -+ if (ret) -+ rwsem_acquire(&rwsem->dep_map, 0, 1, _RET_IP_); -+ -+ return ret; -+} -+EXPORT_SYMBOL(rt_down_read_trylock); -+ -+void rt__down_read(struct rw_semaphore *rwsem) -+{ -+ struct rt_mutex *lock = &rwsem->lock; -+ -+ if (rt_mutex_owner(lock) != current) -+ rt_mutex_lock(&rwsem->lock); -+ rwsem->read_depth++; -+} -+EXPORT_SYMBOL(rt__down_read); -+ -+static void __rt_down_read(struct rw_semaphore *rwsem, int subclass) -+{ -+ rwsem_acquire_read(&rwsem->dep_map, subclass, 0, _RET_IP_); -+ rt__down_read(rwsem); -+} -+ -+void rt_down_read(struct rw_semaphore *rwsem) -+{ -+ __rt_down_read(rwsem, 0); -+} -+EXPORT_SYMBOL(rt_down_read); -+ -+void rt_down_read_nested(struct rw_semaphore *rwsem, int subclass) -+{ -+ __rt_down_read(rwsem, subclass); -+} -+EXPORT_SYMBOL(rt_down_read_nested); -+ -+void __rt_rwsem_init(struct rw_semaphore *rwsem, const char *name, -+ struct lock_class_key *key) -+{ -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+ /* -+ * Make sure we are not reinitializing a held lock: -+ */ -+ debug_check_no_locks_freed((void *)rwsem, sizeof(*rwsem)); -+ lockdep_init_map(&rwsem->dep_map, name, key, 0); -+#endif -+ rwsem->read_depth = 0; -+ rwsem->lock.save_state = 0; -+} -+EXPORT_SYMBOL(__rt_rwsem_init); -+ -+/** -+ * atomic_dec_and_mutex_lock - return holding mutex if we dec to 0 -+ * @cnt: the atomic which we are to dec -+ * @lock: the mutex to return holding if we dec to 0 -+ * -+ * return true and hold lock if we dec to 0, return false otherwise -+ */ -+int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock) -+{ -+ /* dec if we can't possibly hit 0 */ -+ if (atomic_add_unless(cnt, -1, 1)) -+ return 0; -+ /* we might hit 0, so take the lock */ -+ mutex_lock(lock); -+ if (!atomic_dec_and_test(cnt)) { -+ /* when we actually did the dec, we didn't hit 0 */ -+ mutex_unlock(lock); -+ return 0; -+ } -+ /* we hit 0, and we hold the lock */ -+ return 1; -+} -+EXPORT_SYMBOL(atomic_dec_and_mutex_lock); -diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c -index 3e746607abe5..fde5e54f1096 100644 ---- a/kernel/locking/rtmutex.c -+++ b/kernel/locking/rtmutex.c -@@ -7,6 +7,11 @@ - * Copyright (C) 2005-2006 Timesys Corp., Thomas Gleixner <tglx@timesys.com> - * Copyright (C) 2005 Kihon Technologies Inc., Steven Rostedt - * Copyright (C) 2006 Esben Nielsen -+ * Adaptive Spinlocks: -+ * Copyright (C) 2008 Novell, Inc., Gregory Haskins, Sven Dietrich, -+ * and Peter Morreale, -+ * Adaptive Spinlocks simplification: -+ * Copyright (C) 2008 Red Hat, Inc., Steven Rostedt <srostedt@redhat.com> - * - * See Documentation/locking/rt-mutex-design.txt for details. - */ -@@ -16,6 +21,7 @@ - #include <linux/sched/rt.h> - #include <linux/sched/deadline.h> - #include <linux/timer.h> -+#include <linux/ww_mutex.h> - - #include "rtmutex_common.h" - -@@ -69,6 +75,12 @@ static void fixup_rt_mutex_waiters(struct rt_mutex *lock) - clear_rt_mutex_waiters(lock); - } - -+static int rt_mutex_real_waiter(struct rt_mutex_waiter *waiter) -+{ -+ return waiter && waiter != PI_WAKEUP_INPROGRESS && -+ waiter != PI_REQUEUE_INPROGRESS; -+} -+ - /* - * We can speed up the acquire/release, if there's no debugging state to be - * set up. -@@ -350,6 +362,14 @@ static bool rt_mutex_cond_detect_deadlock(struct rt_mutex_waiter *waiter, - return debug_rt_mutex_detect_deadlock(waiter, chwalk); - } - -+static void rt_mutex_wake_waiter(struct rt_mutex_waiter *waiter) -+{ -+ if (waiter->savestate) -+ wake_up_lock_sleeper(waiter->task); -+ else -+ wake_up_process(waiter->task); -+} -+ - /* - * Max number of times we'll walk the boosting chain: - */ -@@ -357,7 +377,8 @@ int max_lock_depth = 1024; - - static inline struct rt_mutex *task_blocked_on_lock(struct task_struct *p) - { -- return p->pi_blocked_on ? p->pi_blocked_on->lock : NULL; -+ return rt_mutex_real_waiter(p->pi_blocked_on) ? -+ p->pi_blocked_on->lock : NULL; - } - - /* -@@ -493,7 +514,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task, - * reached or the state of the chain has changed while we - * dropped the locks. - */ -- if (!waiter) -+ if (!rt_mutex_real_waiter(waiter)) - goto out_unlock_pi; - - /* -@@ -655,13 +676,16 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task, - * follow here. This is the end of the chain we are walking. - */ - if (!rt_mutex_owner(lock)) { -+ struct rt_mutex_waiter *lock_top_waiter; -+ - /* - * If the requeue [7] above changed the top waiter, - * then we need to wake the new top waiter up to try - * to get the lock. - */ -- if (prerequeue_top_waiter != rt_mutex_top_waiter(lock)) -- wake_up_process(rt_mutex_top_waiter(lock)->task); -+ lock_top_waiter = rt_mutex_top_waiter(lock); -+ if (prerequeue_top_waiter != lock_top_waiter) -+ rt_mutex_wake_waiter(lock_top_waiter); - raw_spin_unlock_irq(&lock->wait_lock); - return 0; - } -@@ -754,6 +778,25 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task, - return ret; - } - -+ -+#define STEAL_NORMAL 0 -+#define STEAL_LATERAL 1 -+ -+/* -+ * Note that RT tasks are excluded from lateral-steals to prevent the -+ * introduction of an unbounded latency -+ */ -+static inline int lock_is_stealable(struct task_struct *task, -+ struct task_struct *pendowner, int mode) -+{ -+ if (mode == STEAL_NORMAL || rt_task(task)) { -+ if (task->prio >= pendowner->prio) -+ return 0; -+ } else if (task->prio > pendowner->prio) -+ return 0; -+ return 1; -+} -+ - /* - * Try to take an rt-mutex - * -@@ -764,8 +807,9 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task, - * @waiter: The waiter that is queued to the lock's wait tree if the - * callsite called task_blocked_on_lock(), otherwise NULL - */ --static int try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task, -- struct rt_mutex_waiter *waiter) -+static int __try_to_take_rt_mutex(struct rt_mutex *lock, -+ struct task_struct *task, -+ struct rt_mutex_waiter *waiter, int mode) - { - /* - * Before testing whether we can acquire @lock, we set the -@@ -802,8 +846,10 @@ static int try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task, - * If waiter is not the highest priority waiter of - * @lock, give up. - */ -- if (waiter != rt_mutex_top_waiter(lock)) -+ if (waiter != rt_mutex_top_waiter(lock)) { -+ /* XXX lock_is_stealable() ? */ - return 0; -+ } - - /* - * We can acquire the lock. Remove the waiter from the -@@ -821,14 +867,10 @@ static int try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task, - * not need to be dequeued. - */ - if (rt_mutex_has_waiters(lock)) { -- /* -- * If @task->prio is greater than or equal to -- * the top waiter priority (kernel view), -- * @task lost. -- */ -- if (task->prio >= rt_mutex_top_waiter(lock)->prio) -- return 0; -+ struct task_struct *pown = rt_mutex_top_waiter(lock)->task; - -+ if (task != pown && !lock_is_stealable(task, pown, mode)) -+ return 0; - /* - * The current top waiter stays enqueued. We - * don't have to change anything in the lock -@@ -877,6 +919,399 @@ static int try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task, - return 1; - } - -+#ifdef CONFIG_PREEMPT_RT_FULL -+/* -+ * preemptible spin_lock functions: -+ */ -+static inline void rt_spin_lock_fastlock(struct rt_mutex *lock, -+ void (*slowfn)(struct rt_mutex *lock, -+ bool mg_off), -+ bool do_mig_dis) -+{ -+ might_sleep_no_state_check(); -+ -+ if (do_mig_dis) -+ migrate_disable(); -+ -+ if (likely(rt_mutex_cmpxchg_acquire(lock, NULL, current))) -+ rt_mutex_deadlock_account_lock(lock, current); -+ else -+ slowfn(lock, do_mig_dis); -+} -+ -+static inline void rt_spin_lock_fastunlock(struct rt_mutex *lock, -+ void (*slowfn)(struct rt_mutex *lock)) -+{ -+ if (likely(rt_mutex_cmpxchg_release(lock, current, NULL))) -+ rt_mutex_deadlock_account_unlock(current); -+ else -+ slowfn(lock); -+} -+#ifdef CONFIG_SMP -+/* -+ * Note that owner is a speculative pointer and dereferencing relies -+ * on rcu_read_lock() and the check against the lock owner. -+ */ -+static int adaptive_wait(struct rt_mutex *lock, -+ struct task_struct *owner) -+{ -+ int res = 0; -+ -+ rcu_read_lock(); -+ for (;;) { -+ if (owner != rt_mutex_owner(lock)) -+ break; -+ /* -+ * Ensure that owner->on_cpu is dereferenced _after_ -+ * checking the above to be valid. -+ */ -+ barrier(); -+ if (!owner->on_cpu) { -+ res = 1; -+ break; -+ } -+ cpu_relax(); -+ } -+ rcu_read_unlock(); -+ return res; -+} -+#else -+static int adaptive_wait(struct rt_mutex *lock, -+ struct task_struct *orig_owner) -+{ -+ return 1; -+} -+#endif -+ -+static int task_blocks_on_rt_mutex(struct rt_mutex *lock, -+ struct rt_mutex_waiter *waiter, -+ struct task_struct *task, -+ enum rtmutex_chainwalk chwalk); -+/* -+ * Slow path lock function spin_lock style: this variant is very -+ * careful not to miss any non-lock wakeups. -+ * -+ * We store the current state under p->pi_lock in p->saved_state and -+ * the try_to_wake_up() code handles this accordingly. -+ */ -+static void noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock, -+ bool mg_off) -+{ -+ struct task_struct *lock_owner, *self = current; -+ struct rt_mutex_waiter waiter, *top_waiter; -+ unsigned long flags; -+ int ret; -+ -+ rt_mutex_init_waiter(&waiter, true); -+ -+ raw_spin_lock_irqsave(&lock->wait_lock, flags); -+ -+ if (__try_to_take_rt_mutex(lock, self, NULL, STEAL_LATERAL)) { -+ raw_spin_unlock_irqrestore(&lock->wait_lock, flags); -+ return; -+ } -+ -+ BUG_ON(rt_mutex_owner(lock) == self); -+ -+ /* -+ * We save whatever state the task is in and we'll restore it -+ * after acquiring the lock taking real wakeups into account -+ * as well. We are serialized via pi_lock against wakeups. See -+ * try_to_wake_up(). -+ */ -+ raw_spin_lock(&self->pi_lock); -+ self->saved_state = self->state; -+ __set_current_state_no_track(TASK_UNINTERRUPTIBLE); -+ raw_spin_unlock(&self->pi_lock); -+ -+ ret = task_blocks_on_rt_mutex(lock, &waiter, self, RT_MUTEX_MIN_CHAINWALK); -+ BUG_ON(ret); -+ -+ for (;;) { -+ /* Try to acquire the lock again. */ -+ if (__try_to_take_rt_mutex(lock, self, &waiter, STEAL_LATERAL)) -+ break; -+ -+ top_waiter = rt_mutex_top_waiter(lock); -+ lock_owner = rt_mutex_owner(lock); -+ -+ raw_spin_unlock_irqrestore(&lock->wait_lock, flags); -+ -+ debug_rt_mutex_print_deadlock(&waiter); -+ -+ if (top_waiter != &waiter || adaptive_wait(lock, lock_owner)) { -+ if (mg_off) -+ migrate_enable(); -+ schedule(); -+ if (mg_off) -+ migrate_disable(); -+ } -+ -+ raw_spin_lock_irqsave(&lock->wait_lock, flags); -+ -+ raw_spin_lock(&self->pi_lock); -+ __set_current_state_no_track(TASK_UNINTERRUPTIBLE); -+ raw_spin_unlock(&self->pi_lock); -+ } -+ -+ /* -+ * Restore the task state to current->saved_state. We set it -+ * to the original state above and the try_to_wake_up() code -+ * has possibly updated it when a real (non-rtmutex) wakeup -+ * happened while we were blocked. Clear saved_state so -+ * try_to_wakeup() does not get confused. -+ */ -+ raw_spin_lock(&self->pi_lock); -+ __set_current_state_no_track(self->saved_state); -+ self->saved_state = TASK_RUNNING; -+ raw_spin_unlock(&self->pi_lock); -+ -+ /* -+ * try_to_take_rt_mutex() sets the waiter bit -+ * unconditionally. We might have to fix that up: -+ */ -+ fixup_rt_mutex_waiters(lock); -+ -+ BUG_ON(rt_mutex_has_waiters(lock) && &waiter == rt_mutex_top_waiter(lock)); -+ BUG_ON(!RB_EMPTY_NODE(&waiter.tree_entry)); -+ -+ raw_spin_unlock_irqrestore(&lock->wait_lock, flags); -+ -+ debug_rt_mutex_free_waiter(&waiter); -+} -+ -+static void mark_wakeup_next_waiter(struct wake_q_head *wake_q, -+ struct wake_q_head *wake_sleeper_q, -+ struct rt_mutex *lock); -+/* -+ * Slow path to release a rt_mutex spin_lock style -+ */ -+static void noinline __sched rt_spin_lock_slowunlock(struct rt_mutex *lock) -+{ -+ unsigned long flags; -+ WAKE_Q(wake_q); -+ WAKE_Q(wake_sleeper_q); -+ -+ raw_spin_lock_irqsave(&lock->wait_lock, flags); -+ -+ debug_rt_mutex_unlock(lock); -+ -+ rt_mutex_deadlock_account_unlock(current); -+ -+ if (!rt_mutex_has_waiters(lock)) { -+ lock->owner = NULL; -+ raw_spin_unlock_irqrestore(&lock->wait_lock, flags); -+ return; -+ } -+ -+ mark_wakeup_next_waiter(&wake_q, &wake_sleeper_q, lock); -+ -+ raw_spin_unlock_irqrestore(&lock->wait_lock, flags); -+ wake_up_q(&wake_q); -+ wake_up_q_sleeper(&wake_sleeper_q); -+ -+ /* Undo pi boosting.when necessary */ -+ rt_mutex_adjust_prio(current); -+} -+ -+void __lockfunc rt_spin_lock__no_mg(spinlock_t *lock) -+{ -+ rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock, false); -+ spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); -+} -+EXPORT_SYMBOL(rt_spin_lock__no_mg); -+ -+void __lockfunc rt_spin_lock(spinlock_t *lock) -+{ -+ rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock, true); -+ spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); -+} -+EXPORT_SYMBOL(rt_spin_lock); -+ -+void __lockfunc __rt_spin_lock(struct rt_mutex *lock) -+{ -+ rt_spin_lock_fastlock(lock, rt_spin_lock_slowlock, true); -+} -+EXPORT_SYMBOL(__rt_spin_lock); -+ -+void __lockfunc __rt_spin_lock__no_mg(struct rt_mutex *lock) -+{ -+ rt_spin_lock_fastlock(lock, rt_spin_lock_slowlock, false); -+} -+EXPORT_SYMBOL(__rt_spin_lock__no_mg); -+ -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+void __lockfunc rt_spin_lock_nested(spinlock_t *lock, int subclass) -+{ -+ spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_); -+ rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock, true); -+} -+EXPORT_SYMBOL(rt_spin_lock_nested); -+#endif -+ -+void __lockfunc rt_spin_unlock__no_mg(spinlock_t *lock) -+{ -+ /* NOTE: we always pass in '1' for nested, for simplicity */ -+ spin_release(&lock->dep_map, 1, _RET_IP_); -+ rt_spin_lock_fastunlock(&lock->lock, rt_spin_lock_slowunlock); -+} -+EXPORT_SYMBOL(rt_spin_unlock__no_mg); -+ -+void __lockfunc rt_spin_unlock(spinlock_t *lock) -+{ -+ /* NOTE: we always pass in '1' for nested, for simplicity */ -+ spin_release(&lock->dep_map, 1, _RET_IP_); -+ rt_spin_lock_fastunlock(&lock->lock, rt_spin_lock_slowunlock); -+ migrate_enable(); -+} -+EXPORT_SYMBOL(rt_spin_unlock); -+ -+void __lockfunc __rt_spin_unlock(struct rt_mutex *lock) -+{ -+ rt_spin_lock_fastunlock(lock, rt_spin_lock_slowunlock); -+} -+EXPORT_SYMBOL(__rt_spin_unlock); -+ -+/* -+ * Wait for the lock to get unlocked: instead of polling for an unlock -+ * (like raw spinlocks do), we lock and unlock, to force the kernel to -+ * schedule if there's contention: -+ */ -+void __lockfunc rt_spin_unlock_wait(spinlock_t *lock) -+{ -+ spin_lock(lock); -+ spin_unlock(lock); -+} -+EXPORT_SYMBOL(rt_spin_unlock_wait); -+ -+int __lockfunc __rt_spin_trylock(struct rt_mutex *lock) -+{ -+ return rt_mutex_trylock(lock); -+} -+ -+int __lockfunc rt_spin_trylock__no_mg(spinlock_t *lock) -+{ -+ int ret; -+ -+ ret = rt_mutex_trylock(&lock->lock); -+ if (ret) -+ spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); -+ return ret; -+} -+EXPORT_SYMBOL(rt_spin_trylock__no_mg); -+ -+int __lockfunc rt_spin_trylock(spinlock_t *lock) -+{ -+ int ret; -+ -+ migrate_disable(); -+ ret = rt_mutex_trylock(&lock->lock); -+ if (ret) -+ spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); -+ else -+ migrate_enable(); -+ return ret; -+} -+EXPORT_SYMBOL(rt_spin_trylock); -+ -+int __lockfunc rt_spin_trylock_bh(spinlock_t *lock) -+{ -+ int ret; -+ -+ local_bh_disable(); -+ ret = rt_mutex_trylock(&lock->lock); -+ if (ret) { -+ migrate_disable(); -+ spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); -+ } else -+ local_bh_enable(); -+ return ret; -+} -+EXPORT_SYMBOL(rt_spin_trylock_bh); -+ -+int __lockfunc rt_spin_trylock_irqsave(spinlock_t *lock, unsigned long *flags) -+{ -+ int ret; -+ -+ *flags = 0; -+ ret = rt_mutex_trylock(&lock->lock); -+ if (ret) { -+ migrate_disable(); -+ spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); -+ } -+ return ret; -+} -+EXPORT_SYMBOL(rt_spin_trylock_irqsave); -+ -+int atomic_dec_and_spin_lock(atomic_t *atomic, spinlock_t *lock) -+{ -+ /* Subtract 1 from counter unless that drops it to 0 (ie. it was 1) */ -+ if (atomic_add_unless(atomic, -1, 1)) -+ return 0; -+ rt_spin_lock(lock); -+ if (atomic_dec_and_test(atomic)) -+ return 1; -+ rt_spin_unlock(lock); -+ return 0; -+} -+EXPORT_SYMBOL(atomic_dec_and_spin_lock); -+ -+ void -+__rt_spin_lock_init(spinlock_t *lock, char *name, struct lock_class_key *key) -+{ -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+ /* -+ * Make sure we are not reinitializing a held lock: -+ */ -+ debug_check_no_locks_freed((void *)lock, sizeof(*lock)); -+ lockdep_init_map(&lock->dep_map, name, key, 0); -+#endif -+} -+EXPORT_SYMBOL(__rt_spin_lock_init); -+ -+#endif /* PREEMPT_RT_FULL */ -+ -+#ifdef CONFIG_PREEMPT_RT_FULL -+ static inline int __sched -+__mutex_lock_check_stamp(struct rt_mutex *lock, struct ww_acquire_ctx *ctx) -+{ -+ struct ww_mutex *ww = container_of(lock, struct ww_mutex, base.lock); -+ struct ww_acquire_ctx *hold_ctx = ACCESS_ONCE(ww->ctx); -+ -+ if (!hold_ctx) -+ return 0; -+ -+ if (unlikely(ctx == hold_ctx)) -+ return -EALREADY; -+ -+ if (ctx->stamp - hold_ctx->stamp <= LONG_MAX && -+ (ctx->stamp != hold_ctx->stamp || ctx > hold_ctx)) { -+#ifdef CONFIG_DEBUG_MUTEXES -+ DEBUG_LOCKS_WARN_ON(ctx->contending_lock); -+ ctx->contending_lock = ww; -+#endif -+ return -EDEADLK; -+ } -+ -+ return 0; -+} -+#else -+ static inline int __sched -+__mutex_lock_check_stamp(struct rt_mutex *lock, struct ww_acquire_ctx *ctx) -+{ -+ BUG(); -+ return 0; -+} -+ -+#endif -+ -+static inline int -+try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task, -+ struct rt_mutex_waiter *waiter) -+{ -+ return __try_to_take_rt_mutex(lock, task, waiter, STEAL_NORMAL); -+} -+ - /* - * Task blocks on lock. - * -@@ -907,6 +1342,23 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock, - return -EDEADLK; - - raw_spin_lock(&task->pi_lock); -+ -+ /* -+ * In the case of futex requeue PI, this will be a proxy -+ * lock. The task will wake unaware that it is enqueueed on -+ * this lock. Avoid blocking on two locks and corrupting -+ * pi_blocked_on via the PI_WAKEUP_INPROGRESS -+ * flag. futex_wait_requeue_pi() sets this when it wakes up -+ * before requeue (due to a signal or timeout). Do not enqueue -+ * the task if PI_WAKEUP_INPROGRESS is set. -+ */ -+ if (task != current && task->pi_blocked_on == PI_WAKEUP_INPROGRESS) { -+ raw_spin_unlock(&task->pi_lock); -+ return -EAGAIN; -+ } -+ -+ BUG_ON(rt_mutex_real_waiter(task->pi_blocked_on)); -+ - __rt_mutex_adjust_prio(task); - waiter->task = task; - waiter->lock = lock; -@@ -930,7 +1382,7 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock, - rt_mutex_enqueue_pi(owner, waiter); - - __rt_mutex_adjust_prio(owner); -- if (owner->pi_blocked_on) -+ if (rt_mutex_real_waiter(owner->pi_blocked_on)) - chain_walk = 1; - } else if (rt_mutex_cond_detect_deadlock(waiter, chwalk)) { - chain_walk = 1; -@@ -972,6 +1424,7 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock, - * Called with lock->wait_lock held and interrupts disabled. - */ - static void mark_wakeup_next_waiter(struct wake_q_head *wake_q, -+ struct wake_q_head *wake_sleeper_q, - struct rt_mutex *lock) - { - struct rt_mutex_waiter *waiter; -@@ -1000,7 +1453,10 @@ static void mark_wakeup_next_waiter(struct wake_q_head *wake_q, - - raw_spin_unlock(¤t->pi_lock); - -- wake_q_add(wake_q, waiter->task); -+ if (waiter->savestate) -+ wake_q_add(wake_sleeper_q, waiter->task); -+ else -+ wake_q_add(wake_q, waiter->task); - } - - /* -@@ -1014,7 +1470,7 @@ static void remove_waiter(struct rt_mutex *lock, - { - bool is_top_waiter = (waiter == rt_mutex_top_waiter(lock)); - struct task_struct *owner = rt_mutex_owner(lock); -- struct rt_mutex *next_lock; -+ struct rt_mutex *next_lock = NULL; - - raw_spin_lock(¤t->pi_lock); - rt_mutex_dequeue(lock, waiter); -@@ -1038,7 +1494,8 @@ static void remove_waiter(struct rt_mutex *lock, - __rt_mutex_adjust_prio(owner); - - /* Store the lock on which owner is blocked or NULL */ -- next_lock = task_blocked_on_lock(owner); -+ if (rt_mutex_real_waiter(owner->pi_blocked_on)) -+ next_lock = task_blocked_on_lock(owner); - - raw_spin_unlock(&owner->pi_lock); - -@@ -1074,17 +1531,17 @@ void rt_mutex_adjust_pi(struct task_struct *task) - raw_spin_lock_irqsave(&task->pi_lock, flags); - - waiter = task->pi_blocked_on; -- if (!waiter || (waiter->prio == task->prio && -+ if (!rt_mutex_real_waiter(waiter) || (waiter->prio == task->prio && - !dl_prio(task->prio))) { - raw_spin_unlock_irqrestore(&task->pi_lock, flags); - return; - } - next_lock = waiter->lock; -- raw_spin_unlock_irqrestore(&task->pi_lock, flags); - - /* gets dropped in rt_mutex_adjust_prio_chain()! */ - get_task_struct(task); - -+ raw_spin_unlock_irqrestore(&task->pi_lock, flags); - rt_mutex_adjust_prio_chain(task, RT_MUTEX_MIN_CHAINWALK, NULL, - next_lock, NULL, task); - } -@@ -1102,7 +1559,8 @@ void rt_mutex_adjust_pi(struct task_struct *task) - static int __sched - __rt_mutex_slowlock(struct rt_mutex *lock, int state, - struct hrtimer_sleeper *timeout, -- struct rt_mutex_waiter *waiter) -+ struct rt_mutex_waiter *waiter, -+ struct ww_acquire_ctx *ww_ctx) - { - int ret = 0; - -@@ -1125,6 +1583,12 @@ __rt_mutex_slowlock(struct rt_mutex *lock, int state, - break; - } - -+ if (ww_ctx && ww_ctx->acquired > 0) { -+ ret = __mutex_lock_check_stamp(lock, ww_ctx); -+ if (ret) -+ break; -+ } -+ - raw_spin_unlock_irq(&lock->wait_lock); - - debug_rt_mutex_print_deadlock(waiter); -@@ -1159,21 +1623,96 @@ static void rt_mutex_handle_deadlock(int res, int detect_deadlock, - } - } - -+static __always_inline void ww_mutex_lock_acquired(struct ww_mutex *ww, -+ struct ww_acquire_ctx *ww_ctx) -+{ -+#ifdef CONFIG_DEBUG_MUTEXES -+ /* -+ * If this WARN_ON triggers, you used ww_mutex_lock to acquire, -+ * but released with a normal mutex_unlock in this call. -+ * -+ * This should never happen, always use ww_mutex_unlock. -+ */ -+ DEBUG_LOCKS_WARN_ON(ww->ctx); -+ -+ /* -+ * Not quite done after calling ww_acquire_done() ? -+ */ -+ DEBUG_LOCKS_WARN_ON(ww_ctx->done_acquire); -+ -+ if (ww_ctx->contending_lock) { -+ /* -+ * After -EDEADLK you tried to -+ * acquire a different ww_mutex? Bad! -+ */ -+ DEBUG_LOCKS_WARN_ON(ww_ctx->contending_lock != ww); -+ -+ /* -+ * You called ww_mutex_lock after receiving -EDEADLK, -+ * but 'forgot' to unlock everything else first? -+ */ -+ DEBUG_LOCKS_WARN_ON(ww_ctx->acquired > 0); -+ ww_ctx->contending_lock = NULL; -+ } -+ -+ /* -+ * Naughty, using a different class will lead to undefined behavior! -+ */ -+ DEBUG_LOCKS_WARN_ON(ww_ctx->ww_class != ww->ww_class); -+#endif -+ ww_ctx->acquired++; -+} -+ -+#ifdef CONFIG_PREEMPT_RT_FULL -+static void ww_mutex_account_lock(struct rt_mutex *lock, -+ struct ww_acquire_ctx *ww_ctx) -+{ -+ struct ww_mutex *ww = container_of(lock, struct ww_mutex, base.lock); -+ struct rt_mutex_waiter *waiter, *n; -+ -+ /* -+ * This branch gets optimized out for the common case, -+ * and is only important for ww_mutex_lock. -+ */ -+ ww_mutex_lock_acquired(ww, ww_ctx); -+ ww->ctx = ww_ctx; -+ -+ /* -+ * Give any possible sleeping processes the chance to wake up, -+ * so they can recheck if they have to back off. -+ */ -+ rbtree_postorder_for_each_entry_safe(waiter, n, &lock->waiters, -+ tree_entry) { -+ /* XXX debug rt mutex waiter wakeup */ -+ -+ BUG_ON(waiter->lock != lock); -+ rt_mutex_wake_waiter(waiter); -+ } -+} -+ -+#else -+ -+static void ww_mutex_account_lock(struct rt_mutex *lock, -+ struct ww_acquire_ctx *ww_ctx) -+{ -+ BUG(); -+} -+#endif -+ - /* - * Slow path lock function: - */ - static int __sched - rt_mutex_slowlock(struct rt_mutex *lock, int state, - struct hrtimer_sleeper *timeout, -- enum rtmutex_chainwalk chwalk) -+ enum rtmutex_chainwalk chwalk, -+ struct ww_acquire_ctx *ww_ctx) - { - struct rt_mutex_waiter waiter; - unsigned long flags; - int ret = 0; - -- debug_rt_mutex_init_waiter(&waiter); -- RB_CLEAR_NODE(&waiter.pi_tree_entry); -- RB_CLEAR_NODE(&waiter.tree_entry); -+ rt_mutex_init_waiter(&waiter, false); - - /* - * Technically we could use raw_spin_[un]lock_irq() here, but this can -@@ -1187,6 +1726,8 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state, - - /* Try to acquire the lock again: */ - if (try_to_take_rt_mutex(lock, current, NULL)) { -+ if (ww_ctx) -+ ww_mutex_account_lock(lock, ww_ctx); - raw_spin_unlock_irqrestore(&lock->wait_lock, flags); - return 0; - } -@@ -1201,13 +1742,23 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state, - - if (likely(!ret)) - /* sleep on the mutex */ -- ret = __rt_mutex_slowlock(lock, state, timeout, &waiter); -+ ret = __rt_mutex_slowlock(lock, state, timeout, &waiter, -+ ww_ctx); -+ else if (ww_ctx) { -+ /* ww_mutex received EDEADLK, let it become EALREADY */ -+ ret = __mutex_lock_check_stamp(lock, ww_ctx); -+ BUG_ON(!ret); -+ } - - if (unlikely(ret)) { - __set_current_state(TASK_RUNNING); - if (rt_mutex_has_waiters(lock)) - remove_waiter(lock, &waiter); -- rt_mutex_handle_deadlock(ret, chwalk, &waiter); -+ /* ww_mutex want to report EDEADLK/EALREADY, let them */ -+ if (!ww_ctx) -+ rt_mutex_handle_deadlock(ret, chwalk, &waiter); -+ } else if (ww_ctx) { -+ ww_mutex_account_lock(lock, ww_ctx); - } - - /* -@@ -1267,7 +1818,8 @@ static inline int rt_mutex_slowtrylock(struct rt_mutex *lock) - * Return whether the current task needs to undo a potential priority boosting. - */ - static bool __sched rt_mutex_slowunlock(struct rt_mutex *lock, -- struct wake_q_head *wake_q) -+ struct wake_q_head *wake_q, -+ struct wake_q_head *wake_sleeper_q) - { - unsigned long flags; - -@@ -1323,7 +1875,7 @@ static bool __sched rt_mutex_slowunlock(struct rt_mutex *lock, - * - * Queue the next waiter for wakeup once we release the wait_lock. - */ -- mark_wakeup_next_waiter(wake_q, lock); -+ mark_wakeup_next_waiter(wake_q, wake_sleeper_q, lock); - - raw_spin_unlock_irqrestore(&lock->wait_lock, flags); - -@@ -1339,31 +1891,36 @@ static bool __sched rt_mutex_slowunlock(struct rt_mutex *lock, - */ - static inline int - rt_mutex_fastlock(struct rt_mutex *lock, int state, -+ struct ww_acquire_ctx *ww_ctx, - int (*slowfn)(struct rt_mutex *lock, int state, - struct hrtimer_sleeper *timeout, -- enum rtmutex_chainwalk chwalk)) -+ enum rtmutex_chainwalk chwalk, -+ struct ww_acquire_ctx *ww_ctx)) - { - if (likely(rt_mutex_cmpxchg_acquire(lock, NULL, current))) { - rt_mutex_deadlock_account_lock(lock, current); - return 0; - } else -- return slowfn(lock, state, NULL, RT_MUTEX_MIN_CHAINWALK); -+ return slowfn(lock, state, NULL, RT_MUTEX_MIN_CHAINWALK, -+ ww_ctx); - } - - static inline int - rt_mutex_timed_fastlock(struct rt_mutex *lock, int state, - struct hrtimer_sleeper *timeout, - enum rtmutex_chainwalk chwalk, -+ struct ww_acquire_ctx *ww_ctx, - int (*slowfn)(struct rt_mutex *lock, int state, - struct hrtimer_sleeper *timeout, -- enum rtmutex_chainwalk chwalk)) -+ enum rtmutex_chainwalk chwalk, -+ struct ww_acquire_ctx *ww_ctx)) - { - if (chwalk == RT_MUTEX_MIN_CHAINWALK && - likely(rt_mutex_cmpxchg_acquire(lock, NULL, current))) { - rt_mutex_deadlock_account_lock(lock, current); - return 0; - } else -- return slowfn(lock, state, timeout, chwalk); -+ return slowfn(lock, state, timeout, chwalk, ww_ctx); - } - - static inline int -@@ -1380,17 +1937,20 @@ rt_mutex_fasttrylock(struct rt_mutex *lock, - static inline void - rt_mutex_fastunlock(struct rt_mutex *lock, - bool (*slowfn)(struct rt_mutex *lock, -- struct wake_q_head *wqh)) -+ struct wake_q_head *wqh, -+ struct wake_q_head *wq_sleeper)) - { - WAKE_Q(wake_q); -+ WAKE_Q(wake_sleeper_q); - - if (likely(rt_mutex_cmpxchg_release(lock, current, NULL))) { - rt_mutex_deadlock_account_unlock(current); - - } else { -- bool deboost = slowfn(lock, &wake_q); -+ bool deboost = slowfn(lock, &wake_q, &wake_sleeper_q); - - wake_up_q(&wake_q); -+ wake_up_q_sleeper(&wake_sleeper_q); - - /* Undo pi boosting if necessary: */ - if (deboost) -@@ -1407,7 +1967,7 @@ void __sched rt_mutex_lock(struct rt_mutex *lock) - { - might_sleep(); - -- rt_mutex_fastlock(lock, TASK_UNINTERRUPTIBLE, rt_mutex_slowlock); -+ rt_mutex_fastlock(lock, TASK_UNINTERRUPTIBLE, NULL, rt_mutex_slowlock); - } - EXPORT_SYMBOL_GPL(rt_mutex_lock); - -@@ -1424,7 +1984,7 @@ int __sched rt_mutex_lock_interruptible(struct rt_mutex *lock) - { - might_sleep(); - -- return rt_mutex_fastlock(lock, TASK_INTERRUPTIBLE, rt_mutex_slowlock); -+ return rt_mutex_fastlock(lock, TASK_INTERRUPTIBLE, NULL, rt_mutex_slowlock); - } - EXPORT_SYMBOL_GPL(rt_mutex_lock_interruptible); - -@@ -1437,11 +1997,30 @@ int rt_mutex_timed_futex_lock(struct rt_mutex *lock, - might_sleep(); - - return rt_mutex_timed_fastlock(lock, TASK_INTERRUPTIBLE, timeout, -- RT_MUTEX_FULL_CHAINWALK, -+ RT_MUTEX_FULL_CHAINWALK, NULL, - rt_mutex_slowlock); - } - - /** -+ * rt_mutex_lock_killable - lock a rt_mutex killable -+ * -+ * @lock: the rt_mutex to be locked -+ * @detect_deadlock: deadlock detection on/off -+ * -+ * Returns: -+ * 0 on success -+ * -EINTR when interrupted by a signal -+ * -EDEADLK when the lock would deadlock (when deadlock detection is on) -+ */ -+int __sched rt_mutex_lock_killable(struct rt_mutex *lock) -+{ -+ might_sleep(); -+ -+ return rt_mutex_fastlock(lock, TASK_KILLABLE, NULL, rt_mutex_slowlock); -+} -+EXPORT_SYMBOL_GPL(rt_mutex_lock_killable); -+ -+/** - * rt_mutex_timed_lock - lock a rt_mutex interruptible - * the timeout structure is provided - * by the caller -@@ -1461,6 +2040,7 @@ rt_mutex_timed_lock(struct rt_mutex *lock, struct hrtimer_sleeper *timeout) - - return rt_mutex_timed_fastlock(lock, TASK_INTERRUPTIBLE, timeout, - RT_MUTEX_MIN_CHAINWALK, -+ NULL, - rt_mutex_slowlock); - } - EXPORT_SYMBOL_GPL(rt_mutex_timed_lock); -@@ -1478,7 +2058,11 @@ EXPORT_SYMBOL_GPL(rt_mutex_timed_lock); - */ - int __sched rt_mutex_trylock(struct rt_mutex *lock) - { -+#ifdef CONFIG_PREEMPT_RT_FULL -+ if (WARN_ON_ONCE(in_irq() || in_nmi())) -+#else - if (WARN_ON(in_irq() || in_nmi() || in_serving_softirq())) -+#endif - return 0; - - return rt_mutex_fasttrylock(lock, rt_mutex_slowtrylock); -@@ -1504,13 +2088,14 @@ EXPORT_SYMBOL_GPL(rt_mutex_unlock); - * required or not. - */ - bool __sched rt_mutex_futex_unlock(struct rt_mutex *lock, -- struct wake_q_head *wqh) -+ struct wake_q_head *wqh, -+ struct wake_q_head *wq_sleeper) - { - if (likely(rt_mutex_cmpxchg_release(lock, current, NULL))) { - rt_mutex_deadlock_account_unlock(current); - return false; - } -- return rt_mutex_slowunlock(lock, wqh); -+ return rt_mutex_slowunlock(lock, wqh, wq_sleeper); - } - - /** -@@ -1543,13 +2128,12 @@ EXPORT_SYMBOL_GPL(rt_mutex_destroy); - void __rt_mutex_init(struct rt_mutex *lock, const char *name) - { - lock->owner = NULL; -- raw_spin_lock_init(&lock->wait_lock); - lock->waiters = RB_ROOT; - lock->waiters_leftmost = NULL; - - debug_rt_mutex_init(lock, name); - } --EXPORT_SYMBOL_GPL(__rt_mutex_init); -+EXPORT_SYMBOL(__rt_mutex_init); - - /** - * rt_mutex_init_proxy_locked - initialize and lock a rt_mutex on behalf of a -@@ -1564,7 +2148,7 @@ EXPORT_SYMBOL_GPL(__rt_mutex_init); - void rt_mutex_init_proxy_locked(struct rt_mutex *lock, - struct task_struct *proxy_owner) - { -- __rt_mutex_init(lock, NULL); -+ rt_mutex_init(lock); - debug_rt_mutex_proxy_lock(lock, proxy_owner); - rt_mutex_set_owner(lock, proxy_owner); - rt_mutex_deadlock_account_lock(lock, proxy_owner); -@@ -1612,6 +2196,35 @@ int rt_mutex_start_proxy_lock(struct rt_mutex *lock, - return 1; - } - -+#ifdef CONFIG_PREEMPT_RT_FULL -+ /* -+ * In PREEMPT_RT there's an added race. -+ * If the task, that we are about to requeue, times out, -+ * it can set the PI_WAKEUP_INPROGRESS. This tells the requeue -+ * to skip this task. But right after the task sets -+ * its pi_blocked_on to PI_WAKEUP_INPROGRESS it can then -+ * block on the spin_lock(&hb->lock), which in RT is an rtmutex. -+ * This will replace the PI_WAKEUP_INPROGRESS with the actual -+ * lock that it blocks on. We *must not* place this task -+ * on this proxy lock in that case. -+ * -+ * To prevent this race, we first take the task's pi_lock -+ * and check if it has updated its pi_blocked_on. If it has, -+ * we assume that it woke up and we return -EAGAIN. -+ * Otherwise, we set the task's pi_blocked_on to -+ * PI_REQUEUE_INPROGRESS, so that if the task is waking up -+ * it will know that we are in the process of requeuing it. -+ */ -+ raw_spin_lock(&task->pi_lock); -+ if (task->pi_blocked_on) { -+ raw_spin_unlock(&task->pi_lock); -+ raw_spin_unlock_irq(&lock->wait_lock); -+ return -EAGAIN; -+ } -+ task->pi_blocked_on = PI_REQUEUE_INPROGRESS; -+ raw_spin_unlock(&task->pi_lock); -+#endif -+ - /* We enforce deadlock detection for futexes */ - ret = task_blocks_on_rt_mutex(lock, waiter, task, - RT_MUTEX_FULL_CHAINWALK); -@@ -1626,7 +2239,7 @@ int rt_mutex_start_proxy_lock(struct rt_mutex *lock, - ret = 0; - } - -- if (unlikely(ret)) -+ if (ret && rt_mutex_has_waiters(lock)) - remove_waiter(lock, waiter); - - raw_spin_unlock_irq(&lock->wait_lock); -@@ -1682,7 +2295,7 @@ int rt_mutex_finish_proxy_lock(struct rt_mutex *lock, - set_current_state(TASK_INTERRUPTIBLE); - - /* sleep on the mutex */ -- ret = __rt_mutex_slowlock(lock, TASK_INTERRUPTIBLE, to, waiter); -+ ret = __rt_mutex_slowlock(lock, TASK_INTERRUPTIBLE, to, waiter, NULL); - - if (unlikely(ret)) - remove_waiter(lock, waiter); -@@ -1697,3 +2310,89 @@ int rt_mutex_finish_proxy_lock(struct rt_mutex *lock, - - return ret; - } -+ -+static inline int -+ww_mutex_deadlock_injection(struct ww_mutex *lock, struct ww_acquire_ctx *ctx) -+{ -+#ifdef CONFIG_DEBUG_WW_MUTEX_SLOWPATH -+ unsigned tmp; -+ -+ if (ctx->deadlock_inject_countdown-- == 0) { -+ tmp = ctx->deadlock_inject_interval; -+ if (tmp > UINT_MAX/4) -+ tmp = UINT_MAX; -+ else -+ tmp = tmp*2 + tmp + tmp/2; -+ -+ ctx->deadlock_inject_interval = tmp; -+ ctx->deadlock_inject_countdown = tmp; -+ ctx->contending_lock = lock; -+ -+ ww_mutex_unlock(lock); -+ -+ return -EDEADLK; -+ } -+#endif -+ -+ return 0; -+} -+ -+#ifdef CONFIG_PREEMPT_RT_FULL -+int __sched -+__ww_mutex_lock_interruptible(struct ww_mutex *lock, struct ww_acquire_ctx *ww_ctx) -+{ -+ int ret; -+ -+ might_sleep(); -+ -+ mutex_acquire_nest(&lock->base.dep_map, 0, 0, &ww_ctx->dep_map, _RET_IP_); -+ ret = rt_mutex_slowlock(&lock->base.lock, TASK_INTERRUPTIBLE, NULL, 0, ww_ctx); -+ if (ret) -+ mutex_release(&lock->base.dep_map, 1, _RET_IP_); -+ else if (!ret && ww_ctx->acquired > 1) -+ return ww_mutex_deadlock_injection(lock, ww_ctx); -+ -+ return ret; -+} -+EXPORT_SYMBOL_GPL(__ww_mutex_lock_interruptible); -+ -+int __sched -+__ww_mutex_lock(struct ww_mutex *lock, struct ww_acquire_ctx *ww_ctx) -+{ -+ int ret; -+ -+ might_sleep(); -+ -+ mutex_acquire_nest(&lock->base.dep_map, 0, 0, &ww_ctx->dep_map, _RET_IP_); -+ ret = rt_mutex_slowlock(&lock->base.lock, TASK_UNINTERRUPTIBLE, NULL, 0, ww_ctx); -+ if (ret) -+ mutex_release(&lock->base.dep_map, 1, _RET_IP_); -+ else if (!ret && ww_ctx->acquired > 1) -+ return ww_mutex_deadlock_injection(lock, ww_ctx); -+ -+ return ret; -+} -+EXPORT_SYMBOL_GPL(__ww_mutex_lock); -+ -+void __sched ww_mutex_unlock(struct ww_mutex *lock) -+{ -+ int nest = !!lock->ctx; -+ -+ /* -+ * The unlocking fastpath is the 0->1 transition from 'locked' -+ * into 'unlocked' state: -+ */ -+ if (nest) { -+#ifdef CONFIG_DEBUG_MUTEXES -+ DEBUG_LOCKS_WARN_ON(!lock->ctx->acquired); -+#endif -+ if (lock->ctx->acquired > 0) -+ lock->ctx->acquired--; -+ lock->ctx = NULL; -+ } -+ -+ mutex_release(&lock->base.dep_map, nest, _RET_IP_); -+ rt_mutex_unlock(&lock->base.lock); -+} -+EXPORT_SYMBOL(ww_mutex_unlock); -+#endif -diff --git a/kernel/locking/rtmutex_common.h b/kernel/locking/rtmutex_common.h -index 4f5f83c7d2d3..289f062f26cd 100644 ---- a/kernel/locking/rtmutex_common.h -+++ b/kernel/locking/rtmutex_common.h -@@ -27,6 +27,7 @@ struct rt_mutex_waiter { - struct rb_node pi_tree_entry; - struct task_struct *task; - struct rt_mutex *lock; -+ bool savestate; - #ifdef CONFIG_DEBUG_RT_MUTEXES - unsigned long ip; - struct pid *deadlock_task_pid; -@@ -97,6 +98,9 @@ enum rtmutex_chainwalk { - /* - * PI-futex support (proxy locking functions, etc.): - */ -+#define PI_WAKEUP_INPROGRESS ((struct rt_mutex_waiter *) 1) -+#define PI_REQUEUE_INPROGRESS ((struct rt_mutex_waiter *) 2) -+ - extern struct task_struct *rt_mutex_next_owner(struct rt_mutex *lock); - extern void rt_mutex_init_proxy_locked(struct rt_mutex *lock, - struct task_struct *proxy_owner); -@@ -110,7 +114,8 @@ extern int rt_mutex_finish_proxy_lock(struct rt_mutex *lock, - struct rt_mutex_waiter *waiter); - extern int rt_mutex_timed_futex_lock(struct rt_mutex *l, struct hrtimer_sleeper *to); - extern bool rt_mutex_futex_unlock(struct rt_mutex *lock, -- struct wake_q_head *wqh); -+ struct wake_q_head *wqh, -+ struct wake_q_head *wq_sleeper); - extern void rt_mutex_adjust_prio(struct task_struct *task); - - #ifdef CONFIG_DEBUG_RT_MUTEXES -@@ -119,4 +124,14 @@ extern void rt_mutex_adjust_prio(struct task_struct *task); - # include "rtmutex.h" - #endif - -+static inline void -+rt_mutex_init_waiter(struct rt_mutex_waiter *waiter, bool savestate) -+{ -+ debug_rt_mutex_init_waiter(waiter); -+ waiter->task = NULL; -+ waiter->savestate = savestate; -+ RB_CLEAR_NODE(&waiter->pi_tree_entry); -+ RB_CLEAR_NODE(&waiter->tree_entry); -+} -+ - #endif -diff --git a/kernel/locking/spinlock.c b/kernel/locking/spinlock.c -index db3ccb1dd614..909779647bd1 100644 ---- a/kernel/locking/spinlock.c -+++ b/kernel/locking/spinlock.c -@@ -124,8 +124,11 @@ void __lockfunc __raw_##op##_lock_bh(locktype##_t *lock) \ - * __[spin|read|write]_lock_bh() - */ - BUILD_LOCK_OPS(spin, raw_spinlock); -+ -+#ifndef CONFIG_PREEMPT_RT_FULL - BUILD_LOCK_OPS(read, rwlock); - BUILD_LOCK_OPS(write, rwlock); -+#endif - - #endif - -@@ -209,6 +212,8 @@ void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock) - EXPORT_SYMBOL(_raw_spin_unlock_bh); - #endif - -+#ifndef CONFIG_PREEMPT_RT_FULL -+ - #ifndef CONFIG_INLINE_READ_TRYLOCK - int __lockfunc _raw_read_trylock(rwlock_t *lock) - { -@@ -353,6 +358,8 @@ void __lockfunc _raw_write_unlock_bh(rwlock_t *lock) - EXPORT_SYMBOL(_raw_write_unlock_bh); - #endif - -+#endif /* !PREEMPT_RT_FULL */ -+ - #ifdef CONFIG_DEBUG_LOCK_ALLOC - - void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass) -diff --git a/kernel/locking/spinlock_debug.c b/kernel/locking/spinlock_debug.c -index 0374a596cffa..94970338d518 100644 ---- a/kernel/locking/spinlock_debug.c -+++ b/kernel/locking/spinlock_debug.c -@@ -31,6 +31,7 @@ void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name, - - EXPORT_SYMBOL(__raw_spin_lock_init); - -+#ifndef CONFIG_PREEMPT_RT_FULL - void __rwlock_init(rwlock_t *lock, const char *name, - struct lock_class_key *key) - { -@@ -48,6 +49,7 @@ void __rwlock_init(rwlock_t *lock, const char *name, - } - - EXPORT_SYMBOL(__rwlock_init); -+#endif - - static void spin_dump(raw_spinlock_t *lock, const char *msg) - { -@@ -159,6 +161,7 @@ void do_raw_spin_unlock(raw_spinlock_t *lock) - arch_spin_unlock(&lock->raw_lock); - } - -+#ifndef CONFIG_PREEMPT_RT_FULL - static void rwlock_bug(rwlock_t *lock, const char *msg) - { - if (!debug_locks_off()) -@@ -300,3 +303,5 @@ void do_raw_write_unlock(rwlock_t *lock) - debug_write_unlock(lock); - arch_write_unlock(&lock->raw_lock); - } -+ -+#endif -diff --git a/kernel/panic.c b/kernel/panic.c -index 535c96510a44..3373a70ac3f0 100644 ---- a/kernel/panic.c -+++ b/kernel/panic.c -@@ -444,9 +444,11 @@ static u64 oops_id; - - static int init_oops_id(void) - { -+#ifndef CONFIG_PREEMPT_RT_FULL - if (!oops_id) - get_random_bytes(&oops_id, sizeof(oops_id)); - else -+#endif - oops_id++; - - return 0; -diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c -index fca9254280ee..4e4063e7b5cc 100644 ---- a/kernel/power/hibernate.c -+++ b/kernel/power/hibernate.c -@@ -285,6 +285,8 @@ static int create_image(int platform_mode) - - local_irq_disable(); - -+ system_state = SYSTEM_SUSPEND; -+ - error = syscore_suspend(); - if (error) { - printk(KERN_ERR "PM: Some system devices failed to power down, " -@@ -314,6 +316,7 @@ static int create_image(int platform_mode) - syscore_resume(); - - Enable_irqs: -+ system_state = SYSTEM_RUNNING; - local_irq_enable(); - - Enable_cpus: -@@ -438,6 +441,7 @@ static int resume_target_kernel(bool platform_mode) - goto Enable_cpus; - - local_irq_disable(); -+ system_state = SYSTEM_SUSPEND; - - error = syscore_suspend(); - if (error) -@@ -471,6 +475,7 @@ static int resume_target_kernel(bool platform_mode) - syscore_resume(); - - Enable_irqs: -+ system_state = SYSTEM_RUNNING; - local_irq_enable(); - - Enable_cpus: -@@ -556,6 +561,7 @@ int hibernation_platform_enter(void) - goto Enable_cpus; - - local_irq_disable(); -+ system_state = SYSTEM_SUSPEND; - syscore_suspend(); - if (pm_wakeup_pending()) { - error = -EAGAIN; -@@ -568,6 +574,7 @@ int hibernation_platform_enter(void) - - Power_up: - syscore_resume(); -+ system_state = SYSTEM_RUNNING; - local_irq_enable(); - - Enable_cpus: -@@ -642,6 +649,10 @@ static void power_down(void) - cpu_relax(); - } - -+#ifndef CONFIG_SUSPEND -+bool pm_in_action; -+#endif -+ - /** - * hibernate - Carry out system hibernation, including saving the image. - */ -@@ -654,6 +665,8 @@ int hibernate(void) - return -EPERM; - } - -+ pm_in_action = true; -+ - lock_system_sleep(); - /* The snapshot device should not be opened while we're running */ - if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { -@@ -719,6 +732,7 @@ int hibernate(void) - atomic_inc(&snapshot_device_available); - Unlock: - unlock_system_sleep(); -+ pm_in_action = false; - return error; - } - -diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c -index 5b70d64b871e..e25382cfb249 100644 ---- a/kernel/power/suspend.c -+++ b/kernel/power/suspend.c -@@ -359,6 +359,8 @@ static int suspend_enter(suspend_state_t state, bool *wakeup) - arch_suspend_disable_irqs(); - BUG_ON(!irqs_disabled()); - -+ system_state = SYSTEM_SUSPEND; -+ - error = syscore_suspend(); - if (!error) { - *wakeup = pm_wakeup_pending(); -@@ -375,6 +377,8 @@ static int suspend_enter(suspend_state_t state, bool *wakeup) - syscore_resume(); - } - -+ system_state = SYSTEM_RUNNING; -+ - arch_suspend_enable_irqs(); - BUG_ON(irqs_disabled()); - -@@ -517,6 +521,8 @@ static int enter_state(suspend_state_t state) - return error; - } - -+bool pm_in_action; -+ - /** - * pm_suspend - Externally visible function for suspending the system. - * @state: System sleep state to enter. -@@ -531,6 +537,8 @@ int pm_suspend(suspend_state_t state) - if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX) - return -EINVAL; - -+ pm_in_action = true; -+ - error = enter_state(state); - if (error) { - suspend_stats.fail++; -@@ -538,6 +546,7 @@ int pm_suspend(suspend_state_t state) - } else { - suspend_stats.success++; - } -+ pm_in_action = false; - return error; - } - EXPORT_SYMBOL(pm_suspend); -diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c -index bfbf284e4218..ba5e3381a8cc 100644 ---- a/kernel/printk/printk.c -+++ b/kernel/printk/printk.c -@@ -246,6 +246,65 @@ __packed __aligned(4) - */ - static DEFINE_RAW_SPINLOCK(logbuf_lock); - -+#ifdef CONFIG_EARLY_PRINTK -+struct console *early_console; -+ -+static void early_vprintk(const char *fmt, va_list ap) -+{ -+ if (early_console) { -+ char buf[512]; -+ int n = vscnprintf(buf, sizeof(buf), fmt, ap); -+ -+ early_console->write(early_console, buf, n); -+ } -+} -+ -+asmlinkage void early_printk(const char *fmt, ...) -+{ -+ va_list ap; -+ -+ va_start(ap, fmt); -+ early_vprintk(fmt, ap); -+ va_end(ap); -+} -+ -+/* -+ * This is independent of any log levels - a global -+ * kill switch that turns off all of printk. -+ * -+ * Used by the NMI watchdog if early-printk is enabled. -+ */ -+static bool __read_mostly printk_killswitch; -+ -+static int __init force_early_printk_setup(char *str) -+{ -+ printk_killswitch = true; -+ return 0; -+} -+early_param("force_early_printk", force_early_printk_setup); -+ -+void printk_kill(void) -+{ -+ printk_killswitch = true; -+} -+ -+#ifdef CONFIG_PRINTK -+static int forced_early_printk(const char *fmt, va_list ap) -+{ -+ if (!printk_killswitch) -+ return 0; -+ early_vprintk(fmt, ap); -+ return 1; -+} -+#endif -+ -+#else -+static inline int forced_early_printk(const char *fmt, va_list ap) -+{ -+ return 0; -+} -+#endif -+ - #ifdef CONFIG_PRINTK - DECLARE_WAIT_QUEUE_HEAD(log_wait); - /* the next printk record to read by syslog(READ) or /proc/kmsg */ -@@ -1209,6 +1268,7 @@ static int syslog_print_all(char __user *buf, int size, bool clear) - { - char *text; - int len = 0; -+ int attempts = 0; - - text = kmalloc(LOG_LINE_MAX + PREFIX_MAX, GFP_KERNEL); - if (!text) -@@ -1220,6 +1280,14 @@ static int syslog_print_all(char __user *buf, int size, bool clear) - u64 seq; - u32 idx; - enum log_flags prev; -+ int num_msg; -+try_again: -+ attempts++; -+ if (attempts > 10) { -+ len = -EBUSY; -+ goto out; -+ } -+ num_msg = 0; - - /* - * Find first record that fits, including all following records, -@@ -1235,6 +1303,14 @@ static int syslog_print_all(char __user *buf, int size, bool clear) - prev = msg->flags; - idx = log_next(idx); - seq++; -+ num_msg++; -+ if (num_msg > 5) { -+ num_msg = 0; -+ raw_spin_unlock_irq(&logbuf_lock); -+ raw_spin_lock_irq(&logbuf_lock); -+ if (clear_seq < log_first_seq) -+ goto try_again; -+ } - } - - /* move first record forward until length fits into the buffer */ -@@ -1248,6 +1324,14 @@ static int syslog_print_all(char __user *buf, int size, bool clear) - prev = msg->flags; - idx = log_next(idx); - seq++; -+ num_msg++; -+ if (num_msg > 5) { -+ num_msg = 0; -+ raw_spin_unlock_irq(&logbuf_lock); -+ raw_spin_lock_irq(&logbuf_lock); -+ if (clear_seq < log_first_seq) -+ goto try_again; -+ } - } - - /* last message fitting into this dump */ -@@ -1288,6 +1372,7 @@ static int syslog_print_all(char __user *buf, int size, bool clear) - clear_seq = log_next_seq; - clear_idx = log_next_idx; - } -+out: - raw_spin_unlock_irq(&logbuf_lock); - - kfree(text); -@@ -1443,6 +1528,12 @@ static void call_console_drivers(int level, - if (!console_drivers) - return; - -+ if (IS_ENABLED(CONFIG_PREEMPT_RT_BASE)) { -+ if (in_irq() || in_nmi()) -+ return; -+ } -+ -+ migrate_disable(); - for_each_console(con) { - if (exclusive_console && con != exclusive_console) - continue; -@@ -1458,6 +1549,7 @@ static void call_console_drivers(int level, - else - con->write(con, text, len); - } -+ migrate_enable(); - } - - /* -@@ -1620,6 +1712,13 @@ asmlinkage int vprintk_emit(int facility, int level, - /* cpu currently holding logbuf_lock in this function */ - static unsigned int logbuf_cpu = UINT_MAX; - -+ /* -+ * Fall back to early_printk if a debugging subsystem has -+ * killed printk output -+ */ -+ if (unlikely(forced_early_printk(fmt, args))) -+ return 1; -+ - if (level == LOGLEVEL_SCHED) { - level = LOGLEVEL_DEFAULT; - in_sched = true; -@@ -1755,13 +1854,23 @@ asmlinkage int vprintk_emit(int facility, int level, - - /* If called from the scheduler, we can not call up(). */ - if (!in_sched) { -+ int may_trylock = 1; -+ - lockdep_off(); -+#ifdef CONFIG_PREEMPT_RT_FULL -+ /* -+ * we can't take a sleeping lock with IRQs or preeption disabled -+ * so we can't print in these contexts -+ */ -+ if (!(preempt_count() == 0 && !irqs_disabled())) -+ may_trylock = 0; -+#endif - /* - * Try to acquire and then immediately release the console - * semaphore. The release will print out buffers and wake up - * /dev/kmsg and syslog() users. - */ -- if (console_trylock()) -+ if (may_trylock && console_trylock()) - console_unlock(); - lockdep_on(); - } -@@ -1901,26 +2010,6 @@ DEFINE_PER_CPU(printk_func_t, printk_func); - - #endif /* CONFIG_PRINTK */ - --#ifdef CONFIG_EARLY_PRINTK --struct console *early_console; -- --asmlinkage __visible void early_printk(const char *fmt, ...) --{ -- va_list ap; -- char buf[512]; -- int n; -- -- if (!early_console) -- return; -- -- va_start(ap, fmt); -- n = vscnprintf(buf, sizeof(buf), fmt, ap); -- va_end(ap); -- -- early_console->write(early_console, buf, n); --} --#endif -- - static int __add_preferred_console(char *name, int idx, char *options, - char *brl_options) - { -@@ -2183,11 +2272,16 @@ static void console_cont_flush(char *text, size_t size) - goto out; - - len = cont_print_text(text, size); -+#ifdef CONFIG_PREEMPT_RT_FULL -+ raw_spin_unlock_irqrestore(&logbuf_lock, flags); -+ call_console_drivers(cont.level, NULL, 0, text, len); -+#else - raw_spin_unlock(&logbuf_lock); - stop_critical_timings(); - call_console_drivers(cont.level, NULL, 0, text, len); - start_critical_timings(); - local_irq_restore(flags); -+#endif - return; - out: - raw_spin_unlock_irqrestore(&logbuf_lock, flags); -@@ -2309,13 +2403,17 @@ void console_unlock(void) - console_idx = log_next(console_idx); - console_seq++; - console_prev = msg->flags; -+#ifdef CONFIG_PREEMPT_RT_FULL -+ raw_spin_unlock_irqrestore(&logbuf_lock, flags); -+ call_console_drivers(level, ext_text, ext_len, text, len); -+#else - raw_spin_unlock(&logbuf_lock); - - stop_critical_timings(); /* don't trace print latency */ - call_console_drivers(level, ext_text, ext_len, text, len); - start_critical_timings(); - local_irq_restore(flags); -- -+#endif - if (do_cond_resched) - cond_resched(); - } -@@ -2367,6 +2465,11 @@ void console_unblank(void) - { - struct console *c; - -+ if (IS_ENABLED(CONFIG_PREEMPT_RT_BASE)) { -+ if (in_irq() || in_nmi()) -+ return; -+ } -+ - /* - * console_unblank can no longer be called in interrupt context unless - * oops_in_progress is set to 1.. -diff --git a/kernel/ptrace.c b/kernel/ptrace.c -index d49bfa1e53e6..b8cf7a82f4e2 100644 ---- a/kernel/ptrace.c -+++ b/kernel/ptrace.c -@@ -128,7 +128,14 @@ static bool ptrace_freeze_traced(struct task_struct *task) - - spin_lock_irq(&task->sighand->siglock); - if (task_is_traced(task) && !__fatal_signal_pending(task)) { -- task->state = __TASK_TRACED; -+ unsigned long flags; -+ -+ raw_spin_lock_irqsave(&task->pi_lock, flags); -+ if (task->state & __TASK_TRACED) -+ task->state = __TASK_TRACED; -+ else -+ task->saved_state = __TASK_TRACED; -+ raw_spin_unlock_irqrestore(&task->pi_lock, flags); - ret = true; - } - spin_unlock_irq(&task->sighand->siglock); -diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c -index 250ea67c1615..6349c9affa4d 100644 ---- a/kernel/rcu/rcutorture.c -+++ b/kernel/rcu/rcutorture.c -@@ -409,6 +409,7 @@ static struct rcu_torture_ops rcu_ops = { - .name = "rcu" - }; - -+#ifndef CONFIG_PREEMPT_RT_FULL - /* - * Definitions for rcu_bh torture testing. - */ -@@ -448,6 +449,12 @@ static struct rcu_torture_ops rcu_bh_ops = { - .name = "rcu_bh" - }; - -+#else -+static struct rcu_torture_ops rcu_bh_ops = { -+ .ttype = INVALID_RCU_FLAVOR, -+}; -+#endif -+ - /* - * Don't even think about trying any of these in real life!!! - * The names includes "busted", and they really means it! -diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c -index 9a535a86e732..ae568fd4885b 100644 ---- a/kernel/rcu/tree.c -+++ b/kernel/rcu/tree.c -@@ -56,6 +56,11 @@ - #include <linux/random.h> - #include <linux/trace_events.h> - #include <linux/suspend.h> -+#include <linux/delay.h> -+#include <linux/gfp.h> -+#include <linux/oom.h> -+#include <linux/smpboot.h> -+#include "../time/tick-internal.h" - - #include "tree.h" - #include "rcu.h" -@@ -254,6 +259,19 @@ void rcu_sched_qs(void) - this_cpu_ptr(&rcu_sched_data), true); - } - -+#ifdef CONFIG_PREEMPT_RT_FULL -+static void rcu_preempt_qs(void); -+ -+void rcu_bh_qs(void) -+{ -+ unsigned long flags; -+ -+ /* Callers to this function, rcu_preempt_qs(), must disable irqs. */ -+ local_irq_save(flags); -+ rcu_preempt_qs(); -+ local_irq_restore(flags); -+} -+#else - void rcu_bh_qs(void) - { - if (__this_cpu_read(rcu_bh_data.cpu_no_qs.s)) { -@@ -263,6 +281,7 @@ void rcu_bh_qs(void) - __this_cpu_write(rcu_bh_data.cpu_no_qs.b.norm, false); - } - } -+#endif - - static DEFINE_PER_CPU(int, rcu_sched_qs_mask); - -@@ -426,11 +445,13 @@ EXPORT_SYMBOL_GPL(rcu_batches_started_sched); - /* - * Return the number of RCU BH batches started thus far for debug & stats. - */ -+#ifndef CONFIG_PREEMPT_RT_FULL - unsigned long rcu_batches_started_bh(void) - { - return rcu_bh_state.gpnum; - } - EXPORT_SYMBOL_GPL(rcu_batches_started_bh); -+#endif - - /* - * Return the number of RCU batches completed thus far for debug & stats. -@@ -450,6 +471,7 @@ unsigned long rcu_batches_completed_sched(void) - } - EXPORT_SYMBOL_GPL(rcu_batches_completed_sched); - -+#ifndef CONFIG_PREEMPT_RT_FULL - /* - * Return the number of RCU BH batches completed thus far for debug & stats. - */ -@@ -477,6 +499,13 @@ void rcu_bh_force_quiescent_state(void) - } - EXPORT_SYMBOL_GPL(rcu_bh_force_quiescent_state); - -+#else -+void rcu_force_quiescent_state(void) -+{ -+} -+EXPORT_SYMBOL_GPL(rcu_force_quiescent_state); -+#endif -+ - /* - * Force a quiescent state for RCU-sched. - */ -@@ -527,9 +556,11 @@ void rcutorture_get_gp_data(enum rcutorture_type test_type, int *flags, - case RCU_FLAVOR: - rsp = rcu_state_p; - break; -+#ifndef CONFIG_PREEMPT_RT_FULL - case RCU_BH_FLAVOR: - rsp = &rcu_bh_state; - break; -+#endif - case RCU_SCHED_FLAVOR: - rsp = &rcu_sched_state; - break; -@@ -2920,18 +2951,17 @@ __rcu_process_callbacks(struct rcu_state *rsp) - /* - * Do RCU core processing for the current CPU. - */ --static void rcu_process_callbacks(struct softirq_action *unused) -+static void rcu_process_callbacks(void) - { - struct rcu_state *rsp; - - if (cpu_is_offline(smp_processor_id())) - return; -- trace_rcu_utilization(TPS("Start RCU core")); - for_each_rcu_flavor(rsp) - __rcu_process_callbacks(rsp); -- trace_rcu_utilization(TPS("End RCU core")); - } - -+static DEFINE_PER_CPU(struct task_struct *, rcu_cpu_kthread_task); - /* - * Schedule RCU callback invocation. If the specified type of RCU - * does not support RCU priority boosting, just do a direct call, -@@ -2943,19 +2973,106 @@ static void invoke_rcu_callbacks(struct rcu_state *rsp, struct rcu_data *rdp) - { - if (unlikely(!READ_ONCE(rcu_scheduler_fully_active))) - return; -- if (likely(!rsp->boost)) { -- rcu_do_batch(rsp, rdp); -- return; -- } -- invoke_rcu_callbacks_kthread(); -+ rcu_do_batch(rsp, rdp); - } - -+static void rcu_wake_cond(struct task_struct *t, int status) -+{ -+ /* -+ * If the thread is yielding, only wake it when this -+ * is invoked from idle -+ */ -+ if (t && (status != RCU_KTHREAD_YIELDING || is_idle_task(current))) -+ wake_up_process(t); -+} -+ -+/* -+ * Wake up this CPU's rcuc kthread to do RCU core processing. -+ */ - static void invoke_rcu_core(void) - { -- if (cpu_online(smp_processor_id())) -- raise_softirq(RCU_SOFTIRQ); -+ unsigned long flags; -+ struct task_struct *t; -+ -+ if (!cpu_online(smp_processor_id())) -+ return; -+ local_irq_save(flags); -+ __this_cpu_write(rcu_cpu_has_work, 1); -+ t = __this_cpu_read(rcu_cpu_kthread_task); -+ if (t != NULL && current != t) -+ rcu_wake_cond(t, __this_cpu_read(rcu_cpu_kthread_status)); -+ local_irq_restore(flags); - } - -+static void rcu_cpu_kthread_park(unsigned int cpu) -+{ -+ per_cpu(rcu_cpu_kthread_status, cpu) = RCU_KTHREAD_OFFCPU; -+} -+ -+static int rcu_cpu_kthread_should_run(unsigned int cpu) -+{ -+ return __this_cpu_read(rcu_cpu_has_work); -+} -+ -+/* -+ * Per-CPU kernel thread that invokes RCU callbacks. This replaces the -+ * RCU softirq used in flavors and configurations of RCU that do not -+ * support RCU priority boosting. -+ */ -+static void rcu_cpu_kthread(unsigned int cpu) -+{ -+ unsigned int *statusp = this_cpu_ptr(&rcu_cpu_kthread_status); -+ char work, *workp = this_cpu_ptr(&rcu_cpu_has_work); -+ int spincnt; -+ -+ for (spincnt = 0; spincnt < 10; spincnt++) { -+ trace_rcu_utilization(TPS("Start CPU kthread@rcu_wait")); -+ local_bh_disable(); -+ *statusp = RCU_KTHREAD_RUNNING; -+ this_cpu_inc(rcu_cpu_kthread_loops); -+ local_irq_disable(); -+ work = *workp; -+ *workp = 0; -+ local_irq_enable(); -+ if (work) -+ rcu_process_callbacks(); -+ local_bh_enable(); -+ if (*workp == 0) { -+ trace_rcu_utilization(TPS("End CPU kthread@rcu_wait")); -+ *statusp = RCU_KTHREAD_WAITING; -+ return; -+ } -+ } -+ *statusp = RCU_KTHREAD_YIELDING; -+ trace_rcu_utilization(TPS("Start CPU kthread@rcu_yield")); -+ schedule_timeout_interruptible(2); -+ trace_rcu_utilization(TPS("End CPU kthread@rcu_yield")); -+ *statusp = RCU_KTHREAD_WAITING; -+} -+ -+static struct smp_hotplug_thread rcu_cpu_thread_spec = { -+ .store = &rcu_cpu_kthread_task, -+ .thread_should_run = rcu_cpu_kthread_should_run, -+ .thread_fn = rcu_cpu_kthread, -+ .thread_comm = "rcuc/%u", -+ .setup = rcu_cpu_kthread_setup, -+ .park = rcu_cpu_kthread_park, -+}; -+ -+/* -+ * Spawn per-CPU RCU core processing kthreads. -+ */ -+static int __init rcu_spawn_core_kthreads(void) -+{ -+ int cpu; -+ -+ for_each_possible_cpu(cpu) -+ per_cpu(rcu_cpu_has_work, cpu) = 0; -+ BUG_ON(smpboot_register_percpu_thread(&rcu_cpu_thread_spec)); -+ return 0; -+} -+early_initcall(rcu_spawn_core_kthreads); -+ - /* - * Handle any core-RCU processing required by a call_rcu() invocation. - */ -@@ -3099,6 +3216,7 @@ void call_rcu_sched(struct rcu_head *head, rcu_callback_t func) - } - EXPORT_SYMBOL_GPL(call_rcu_sched); - -+#ifndef CONFIG_PREEMPT_RT_FULL - /* - * Queue an RCU callback for invocation after a quicker grace period. - */ -@@ -3107,6 +3225,7 @@ void call_rcu_bh(struct rcu_head *head, rcu_callback_t func) - __call_rcu(head, func, &rcu_bh_state, -1, 0); - } - EXPORT_SYMBOL_GPL(call_rcu_bh); -+#endif - - /* - * Queue an RCU callback for lazy invocation after a grace period. -@@ -3198,6 +3317,7 @@ void synchronize_sched(void) - } - EXPORT_SYMBOL_GPL(synchronize_sched); - -+#ifndef CONFIG_PREEMPT_RT_FULL - /** - * synchronize_rcu_bh - wait until an rcu_bh grace period has elapsed. - * -@@ -3224,6 +3344,7 @@ void synchronize_rcu_bh(void) - wait_rcu_gp(call_rcu_bh); - } - EXPORT_SYMBOL_GPL(synchronize_rcu_bh); -+#endif - - /** - * get_state_synchronize_rcu - Snapshot current RCU state -@@ -4104,6 +4225,7 @@ static void _rcu_barrier(struct rcu_state *rsp) - mutex_unlock(&rsp->barrier_mutex); - } - -+#ifndef CONFIG_PREEMPT_RT_FULL - /** - * rcu_barrier_bh - Wait until all in-flight call_rcu_bh() callbacks complete. - */ -@@ -4112,6 +4234,7 @@ void rcu_barrier_bh(void) - _rcu_barrier(&rcu_bh_state); - } - EXPORT_SYMBOL_GPL(rcu_barrier_bh); -+#endif - - /** - * rcu_barrier_sched - Wait for in-flight call_rcu_sched() callbacks. -@@ -4609,12 +4732,13 @@ void __init rcu_init(void) - - rcu_bootup_announce(); - rcu_init_geometry(); -+#ifndef CONFIG_PREEMPT_RT_FULL - rcu_init_one(&rcu_bh_state); -+#endif - rcu_init_one(&rcu_sched_state); - if (dump_tree) - rcu_dump_rcu_node_tree(&rcu_sched_state); - __rcu_init_preempt(); -- open_softirq(RCU_SOFTIRQ, rcu_process_callbacks); - - /* - * We don't need protection against CPU-hotplug here because -diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h -index df668c0f9e64..dd3efa3402fc 100644 ---- a/kernel/rcu/tree.h -+++ b/kernel/rcu/tree.h -@@ -572,18 +572,18 @@ extern struct list_head rcu_struct_flavors; - */ - extern struct rcu_state rcu_sched_state; - -+#ifndef CONFIG_PREEMPT_RT_FULL - extern struct rcu_state rcu_bh_state; -+#endif - - #ifdef CONFIG_PREEMPT_RCU - extern struct rcu_state rcu_preempt_state; - #endif /* #ifdef CONFIG_PREEMPT_RCU */ - --#ifdef CONFIG_RCU_BOOST - DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_status); - DECLARE_PER_CPU(int, rcu_cpu_kthread_cpu); - DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_loops); - DECLARE_PER_CPU(char, rcu_cpu_has_work); --#endif /* #ifdef CONFIG_RCU_BOOST */ - - #ifndef RCU_TREE_NONCORE - -@@ -603,10 +603,9 @@ void call_rcu(struct rcu_head *head, rcu_callback_t func); - static void __init __rcu_init_preempt(void); - static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags); - static void rcu_preempt_boost_start_gp(struct rcu_node *rnp); --static void invoke_rcu_callbacks_kthread(void); - static bool rcu_is_callbacks_kthread(void); -+static void rcu_cpu_kthread_setup(unsigned int cpu); - #ifdef CONFIG_RCU_BOOST --static void rcu_preempt_do_callbacks(void); - static int rcu_spawn_one_boost_kthread(struct rcu_state *rsp, - struct rcu_node *rnp); - #endif /* #ifdef CONFIG_RCU_BOOST */ -diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h -index efdf7b61ce12..6a4158a83375 100644 ---- a/kernel/rcu/tree_plugin.h -+++ b/kernel/rcu/tree_plugin.h -@@ -24,25 +24,10 @@ - * Paul E. McKenney <paulmck@linux.vnet.ibm.com> - */ - --#include <linux/delay.h> --#include <linux/gfp.h> --#include <linux/oom.h> --#include <linux/smpboot.h> --#include "../time/tick-internal.h" -- - #ifdef CONFIG_RCU_BOOST - - #include "../locking/rtmutex_common.h" - --/* -- * Control variables for per-CPU and per-rcu_node kthreads. These -- * handle all flavors of RCU. -- */ --static DEFINE_PER_CPU(struct task_struct *, rcu_cpu_kthread_task); --DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_status); --DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_loops); --DEFINE_PER_CPU(char, rcu_cpu_has_work); -- - #else /* #ifdef CONFIG_RCU_BOOST */ - - /* -@@ -55,6 +40,14 @@ DEFINE_PER_CPU(char, rcu_cpu_has_work); - - #endif /* #else #ifdef CONFIG_RCU_BOOST */ - -+/* -+ * Control variables for per-CPU and per-rcu_node kthreads. These -+ * handle all flavors of RCU. -+ */ -+DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_status); -+DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_loops); -+DEFINE_PER_CPU(char, rcu_cpu_has_work); -+ - #ifdef CONFIG_RCU_NOCB_CPU - static cpumask_var_t rcu_nocb_mask; /* CPUs to have callbacks offloaded. */ - static bool have_rcu_nocb_mask; /* Was rcu_nocb_mask allocated? */ -@@ -428,7 +421,7 @@ void rcu_read_unlock_special(struct task_struct *t) - } - - /* Hardware IRQ handlers cannot block, complain if they get here. */ -- if (in_irq() || in_serving_softirq()) { -+ if (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_OFFSET)) { - lockdep_rcu_suspicious(__FILE__, __LINE__, - "rcu_read_unlock() from irq or softirq with blocking in critical section!!!\n"); - pr_alert("->rcu_read_unlock_special: %#x (b: %d, enq: %d nq: %d)\n", -@@ -634,15 +627,6 @@ static void rcu_preempt_check_callbacks(void) - t->rcu_read_unlock_special.b.need_qs = true; - } - --#ifdef CONFIG_RCU_BOOST -- --static void rcu_preempt_do_callbacks(void) --{ -- rcu_do_batch(rcu_state_p, this_cpu_ptr(rcu_data_p)); --} -- --#endif /* #ifdef CONFIG_RCU_BOOST */ -- - /* - * Queue a preemptible-RCU callback for invocation after a grace period. - */ -@@ -924,6 +908,19 @@ void exit_rcu(void) - - #endif /* #else #ifdef CONFIG_PREEMPT_RCU */ - -+/* -+ * If boosting, set rcuc kthreads to realtime priority. -+ */ -+static void rcu_cpu_kthread_setup(unsigned int cpu) -+{ -+#ifdef CONFIG_RCU_BOOST -+ struct sched_param sp; -+ -+ sp.sched_priority = kthread_prio; -+ sched_setscheduler_nocheck(current, SCHED_FIFO, &sp); -+#endif /* #ifdef CONFIG_RCU_BOOST */ -+} -+ - #ifdef CONFIG_RCU_BOOST - - #include "../locking/rtmutex_common.h" -@@ -955,16 +952,6 @@ static void rcu_initiate_boost_trace(struct rcu_node *rnp) - - #endif /* #else #ifdef CONFIG_RCU_TRACE */ - --static void rcu_wake_cond(struct task_struct *t, int status) --{ -- /* -- * If the thread is yielding, only wake it when this -- * is invoked from idle -- */ -- if (status != RCU_KTHREAD_YIELDING || is_idle_task(current)) -- wake_up_process(t); --} -- - /* - * Carry out RCU priority boosting on the task indicated by ->exp_tasks - * or ->boost_tasks, advancing the pointer to the next task in the -@@ -1108,23 +1095,6 @@ static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags) - } - - /* -- * Wake up the per-CPU kthread to invoke RCU callbacks. -- */ --static void invoke_rcu_callbacks_kthread(void) --{ -- unsigned long flags; -- -- local_irq_save(flags); -- __this_cpu_write(rcu_cpu_has_work, 1); -- if (__this_cpu_read(rcu_cpu_kthread_task) != NULL && -- current != __this_cpu_read(rcu_cpu_kthread_task)) { -- rcu_wake_cond(__this_cpu_read(rcu_cpu_kthread_task), -- __this_cpu_read(rcu_cpu_kthread_status)); -- } -- local_irq_restore(flags); --} -- --/* - * Is the current CPU running the RCU-callbacks kthread? - * Caller must have preemption disabled. - */ -@@ -1178,67 +1148,6 @@ static int rcu_spawn_one_boost_kthread(struct rcu_state *rsp, - return 0; - } - --static void rcu_kthread_do_work(void) --{ -- rcu_do_batch(&rcu_sched_state, this_cpu_ptr(&rcu_sched_data)); -- rcu_do_batch(&rcu_bh_state, this_cpu_ptr(&rcu_bh_data)); -- rcu_preempt_do_callbacks(); --} -- --static void rcu_cpu_kthread_setup(unsigned int cpu) --{ -- struct sched_param sp; -- -- sp.sched_priority = kthread_prio; -- sched_setscheduler_nocheck(current, SCHED_FIFO, &sp); --} -- --static void rcu_cpu_kthread_park(unsigned int cpu) --{ -- per_cpu(rcu_cpu_kthread_status, cpu) = RCU_KTHREAD_OFFCPU; --} -- --static int rcu_cpu_kthread_should_run(unsigned int cpu) --{ -- return __this_cpu_read(rcu_cpu_has_work); --} -- --/* -- * Per-CPU kernel thread that invokes RCU callbacks. This replaces the -- * RCU softirq used in flavors and configurations of RCU that do not -- * support RCU priority boosting. -- */ --static void rcu_cpu_kthread(unsigned int cpu) --{ -- unsigned int *statusp = this_cpu_ptr(&rcu_cpu_kthread_status); -- char work, *workp = this_cpu_ptr(&rcu_cpu_has_work); -- int spincnt; -- -- for (spincnt = 0; spincnt < 10; spincnt++) { -- trace_rcu_utilization(TPS("Start CPU kthread@rcu_wait")); -- local_bh_disable(); -- *statusp = RCU_KTHREAD_RUNNING; -- this_cpu_inc(rcu_cpu_kthread_loops); -- local_irq_disable(); -- work = *workp; -- *workp = 0; -- local_irq_enable(); -- if (work) -- rcu_kthread_do_work(); -- local_bh_enable(); -- if (*workp == 0) { -- trace_rcu_utilization(TPS("End CPU kthread@rcu_wait")); -- *statusp = RCU_KTHREAD_WAITING; -- return; -- } -- } -- *statusp = RCU_KTHREAD_YIELDING; -- trace_rcu_utilization(TPS("Start CPU kthread@rcu_yield")); -- schedule_timeout_interruptible(2); -- trace_rcu_utilization(TPS("End CPU kthread@rcu_yield")); -- *statusp = RCU_KTHREAD_WAITING; --} -- - /* - * Set the per-rcu_node kthread's affinity to cover all CPUs that are - * served by the rcu_node in question. The CPU hotplug lock is still -@@ -1268,26 +1177,12 @@ static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu) - free_cpumask_var(cm); - } - --static struct smp_hotplug_thread rcu_cpu_thread_spec = { -- .store = &rcu_cpu_kthread_task, -- .thread_should_run = rcu_cpu_kthread_should_run, -- .thread_fn = rcu_cpu_kthread, -- .thread_comm = "rcuc/%u", -- .setup = rcu_cpu_kthread_setup, -- .park = rcu_cpu_kthread_park, --}; -- - /* - * Spawn boost kthreads -- called as soon as the scheduler is running. - */ - static void __init rcu_spawn_boost_kthreads(void) - { - struct rcu_node *rnp; -- int cpu; -- -- for_each_possible_cpu(cpu) -- per_cpu(rcu_cpu_has_work, cpu) = 0; -- BUG_ON(smpboot_register_percpu_thread(&rcu_cpu_thread_spec)); - rcu_for_each_leaf_node(rcu_state_p, rnp) - (void)rcu_spawn_one_boost_kthread(rcu_state_p, rnp); - } -@@ -1310,11 +1205,6 @@ static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags) - raw_spin_unlock_irqrestore_rcu_node(rnp, flags); - } - --static void invoke_rcu_callbacks_kthread(void) --{ -- WARN_ON_ONCE(1); --} -- - static bool rcu_is_callbacks_kthread(void) - { - return false; -@@ -1338,7 +1228,7 @@ static void rcu_prepare_kthreads(int cpu) - - #endif /* #else #ifdef CONFIG_RCU_BOOST */ - --#if !defined(CONFIG_RCU_FAST_NO_HZ) -+#if !defined(CONFIG_RCU_FAST_NO_HZ) || defined(CONFIG_PREEMPT_RT_FULL) - - /* - * Check to see if any future RCU-related work will need to be done -@@ -1355,7 +1245,9 @@ int rcu_needs_cpu(u64 basemono, u64 *nextevt) - return IS_ENABLED(CONFIG_RCU_NOCB_CPU_ALL) - ? 0 : rcu_cpu_has_callbacks(NULL); - } -+#endif /* !defined(CONFIG_RCU_FAST_NO_HZ) || defined(CONFIG_PREEMPT_RT_FULL) */ - -+#if !defined(CONFIG_RCU_FAST_NO_HZ) - /* - * Because we do not have RCU_FAST_NO_HZ, don't bother cleaning up - * after it. -@@ -1451,6 +1343,8 @@ static bool __maybe_unused rcu_try_advance_all_cbs(void) - return cbs_ready; - } - -+#ifndef CONFIG_PREEMPT_RT_FULL -+ - /* - * Allow the CPU to enter dyntick-idle mode unless it has callbacks ready - * to invoke. If the CPU has callbacks, try to advance them. Tell the -@@ -1496,6 +1390,7 @@ int rcu_needs_cpu(u64 basemono, u64 *nextevt) - *nextevt = basemono + dj * TICK_NSEC; - return 0; - } -+#endif /* #ifndef CONFIG_PREEMPT_RT_FULL */ - - /* - * Prepare a CPU for idle from an RCU perspective. The first major task -diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c -index ca828b41c938..6cbf7a9aa70f 100644 ---- a/kernel/rcu/update.c -+++ b/kernel/rcu/update.c -@@ -295,6 +295,7 @@ int rcu_read_lock_held(void) - } - EXPORT_SYMBOL_GPL(rcu_read_lock_held); - -+#ifndef CONFIG_PREEMPT_RT_FULL - /** - * rcu_read_lock_bh_held() - might we be in RCU-bh read-side critical section? - * -@@ -321,6 +322,7 @@ int rcu_read_lock_bh_held(void) - return in_softirq() || irqs_disabled(); - } - EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held); -+#endif - - #endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ - -diff --git a/kernel/relay.c b/kernel/relay.c -index 074994bcfa9b..7206cef7d6da 100644 ---- a/kernel/relay.c -+++ b/kernel/relay.c -@@ -336,6 +336,10 @@ static void wakeup_readers(unsigned long data) - { - struct rchan_buf *buf = (struct rchan_buf *)data; - wake_up_interruptible(&buf->read_wait); -+ /* -+ * Stupid polling for now: -+ */ -+ mod_timer(&buf->timer, jiffies + 1); - } - - /** -@@ -353,6 +357,7 @@ static void __relay_reset(struct rchan_buf *buf, unsigned int init) - init_waitqueue_head(&buf->read_wait); - kref_init(&buf->kref); - setup_timer(&buf->timer, wakeup_readers, (unsigned long)buf); -+ mod_timer(&buf->timer, jiffies + 1); - } else - del_timer_sync(&buf->timer); - -@@ -736,15 +741,6 @@ size_t relay_switch_subbuf(struct rchan_buf *buf, size_t length) - else - buf->early_bytes += buf->chan->subbuf_size - - buf->padding[old_subbuf]; -- smp_mb(); -- if (waitqueue_active(&buf->read_wait)) -- /* -- * Calling wake_up_interruptible() from here -- * will deadlock if we happen to be logging -- * from the scheduler (trying to re-grab -- * rq->lock), so defer it. -- */ -- mod_timer(&buf->timer, jiffies + 1); - } - - old = buf->data; -diff --git a/kernel/sched/Makefile b/kernel/sched/Makefile -index 414d9c16da42..5aaddf5838e9 100644 ---- a/kernel/sched/Makefile -+++ b/kernel/sched/Makefile -@@ -17,7 +17,7 @@ endif - - obj-y += core.o loadavg.o clock.o cputime.o - obj-y += idle_task.o fair.o rt.o deadline.o stop_task.o --obj-y += wait.o swait.o completion.o idle.o -+obj-y += wait.o swait.o swork.o completion.o idle.o - obj-$(CONFIG_SMP) += cpupri.o cpudeadline.o - obj-$(CONFIG_SCHED_AUTOGROUP) += auto_group.o - obj-$(CONFIG_SCHEDSTATS) += stats.o -diff --git a/kernel/sched/completion.c b/kernel/sched/completion.c -index 8d0f35debf35..b62cf6400fe0 100644 ---- a/kernel/sched/completion.c -+++ b/kernel/sched/completion.c -@@ -30,10 +30,10 @@ void complete(struct completion *x) - { - unsigned long flags; - -- spin_lock_irqsave(&x->wait.lock, flags); -+ raw_spin_lock_irqsave(&x->wait.lock, flags); - x->done++; -- __wake_up_locked(&x->wait, TASK_NORMAL, 1); -- spin_unlock_irqrestore(&x->wait.lock, flags); -+ swake_up_locked(&x->wait); -+ raw_spin_unlock_irqrestore(&x->wait.lock, flags); - } - EXPORT_SYMBOL(complete); - -@@ -50,10 +50,10 @@ void complete_all(struct completion *x) - { - unsigned long flags; - -- spin_lock_irqsave(&x->wait.lock, flags); -+ raw_spin_lock_irqsave(&x->wait.lock, flags); - x->done += UINT_MAX/2; -- __wake_up_locked(&x->wait, TASK_NORMAL, 0); -- spin_unlock_irqrestore(&x->wait.lock, flags); -+ swake_up_all_locked(&x->wait); -+ raw_spin_unlock_irqrestore(&x->wait.lock, flags); - } - EXPORT_SYMBOL(complete_all); - -@@ -62,20 +62,20 @@ do_wait_for_common(struct completion *x, - long (*action)(long), long timeout, int state) - { - if (!x->done) { -- DECLARE_WAITQUEUE(wait, current); -+ DECLARE_SWAITQUEUE(wait); - -- __add_wait_queue_tail_exclusive(&x->wait, &wait); -+ __prepare_to_swait(&x->wait, &wait); - do { - if (signal_pending_state(state, current)) { - timeout = -ERESTARTSYS; - break; - } - __set_current_state(state); -- spin_unlock_irq(&x->wait.lock); -+ raw_spin_unlock_irq(&x->wait.lock); - timeout = action(timeout); -- spin_lock_irq(&x->wait.lock); -+ raw_spin_lock_irq(&x->wait.lock); - } while (!x->done && timeout); -- __remove_wait_queue(&x->wait, &wait); -+ __finish_swait(&x->wait, &wait); - if (!x->done) - return timeout; - } -@@ -89,9 +89,9 @@ __wait_for_common(struct completion *x, - { - might_sleep(); - -- spin_lock_irq(&x->wait.lock); -+ raw_spin_lock_irq(&x->wait.lock); - timeout = do_wait_for_common(x, action, timeout, state); -- spin_unlock_irq(&x->wait.lock); -+ raw_spin_unlock_irq(&x->wait.lock); - return timeout; - } - -@@ -277,12 +277,12 @@ bool try_wait_for_completion(struct completion *x) - if (!READ_ONCE(x->done)) - return 0; - -- spin_lock_irqsave(&x->wait.lock, flags); -+ raw_spin_lock_irqsave(&x->wait.lock, flags); - if (!x->done) - ret = 0; - else - x->done--; -- spin_unlock_irqrestore(&x->wait.lock, flags); -+ raw_spin_unlock_irqrestore(&x->wait.lock, flags); - return ret; - } - EXPORT_SYMBOL(try_wait_for_completion); -@@ -311,7 +311,7 @@ bool completion_done(struct completion *x) - * after it's acquired the lock. - */ - smp_rmb(); -- spin_unlock_wait(&x->wait.lock); -+ raw_spin_unlock_wait(&x->wait.lock); - return true; - } - EXPORT_SYMBOL(completion_done); -diff --git a/kernel/sched/core.c b/kernel/sched/core.c -index 11546a6ed5df..140ee06079b6 100644 ---- a/kernel/sched/core.c -+++ b/kernel/sched/core.c -@@ -128,7 +128,11 @@ const_debug unsigned int sysctl_sched_features = - * Number of tasks to iterate in a single balance run. - * Limited because this is done with IRQs disabled. - */ -+#ifndef CONFIG_PREEMPT_RT_FULL - const_debug unsigned int sysctl_sched_nr_migrate = 32; -+#else -+const_debug unsigned int sysctl_sched_nr_migrate = 8; -+#endif - - /* - * period over which we average the RT time consumption, measured -@@ -306,6 +310,7 @@ static void init_rq_hrtick(struct rq *rq) - - hrtimer_init(&rq->hrtick_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); - rq->hrtick_timer.function = hrtick; -+ rq->hrtick_timer.irqsafe = 1; - } - #else /* CONFIG_SCHED_HRTICK */ - static inline void hrtick_clear(struct rq *rq) -@@ -414,7 +419,7 @@ void wake_q_add(struct wake_q_head *head, struct task_struct *task) - head->lastp = &node->next; - } - --void wake_up_q(struct wake_q_head *head) -+void __wake_up_q(struct wake_q_head *head, bool sleeper) - { - struct wake_q_node *node = head->first; - -@@ -431,7 +436,10 @@ void wake_up_q(struct wake_q_head *head) - * wake_up_process() implies a wmb() to pair with the queueing - * in wake_q_add() so as not to miss wakeups. - */ -- wake_up_process(task); -+ if (sleeper) -+ wake_up_lock_sleeper(task); -+ else -+ wake_up_process(task); - put_task_struct(task); - } - } -@@ -467,6 +475,38 @@ void resched_curr(struct rq *rq) - trace_sched_wake_idle_without_ipi(cpu); - } - -+#ifdef CONFIG_PREEMPT_LAZY -+void resched_curr_lazy(struct rq *rq) -+{ -+ struct task_struct *curr = rq->curr; -+ int cpu; -+ -+ if (!sched_feat(PREEMPT_LAZY)) { -+ resched_curr(rq); -+ return; -+ } -+ -+ lockdep_assert_held(&rq->lock); -+ -+ if (test_tsk_need_resched(curr)) -+ return; -+ -+ if (test_tsk_need_resched_lazy(curr)) -+ return; -+ -+ set_tsk_need_resched_lazy(curr); -+ -+ cpu = cpu_of(rq); -+ if (cpu == smp_processor_id()) -+ return; -+ -+ /* NEED_RESCHED_LAZY must be visible before we test polling */ -+ smp_mb(); -+ if (!tsk_is_polling(curr)) -+ smp_send_reschedule(cpu); -+} -+#endif -+ - void resched_cpu(int cpu) - { - struct rq *rq = cpu_rq(cpu); -@@ -490,11 +530,14 @@ void resched_cpu(int cpu) - */ - int get_nohz_timer_target(void) - { -- int i, cpu = smp_processor_id(); -+ int i, cpu; - struct sched_domain *sd; - -+ preempt_disable_rt(); -+ cpu = smp_processor_id(); -+ - if (!idle_cpu(cpu) && is_housekeeping_cpu(cpu)) -- return cpu; -+ goto preempt_en_rt; - - rcu_read_lock(); - for_each_domain(cpu, sd) { -@@ -510,6 +553,8 @@ int get_nohz_timer_target(void) - cpu = housekeeping_any_cpu(); - unlock: - rcu_read_unlock(); -+preempt_en_rt: -+ preempt_enable_rt(); - return cpu; - } - /* -@@ -1051,6 +1096,11 @@ void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) - - lockdep_assert_held(&p->pi_lock); - -+ if (__migrate_disabled(p)) { -+ cpumask_copy(&p->cpus_allowed, new_mask); -+ return; -+ } -+ - queued = task_on_rq_queued(p); - running = task_current(rq, p); - -@@ -1073,6 +1123,84 @@ void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) - enqueue_task(rq, p, ENQUEUE_RESTORE); - } - -+static DEFINE_PER_CPU(struct cpumask, sched_cpumasks); -+static DEFINE_MUTEX(sched_down_mutex); -+static cpumask_t sched_down_cpumask; -+ -+void tell_sched_cpu_down_begin(int cpu) -+{ -+ mutex_lock(&sched_down_mutex); -+ cpumask_set_cpu(cpu, &sched_down_cpumask); -+ mutex_unlock(&sched_down_mutex); -+} -+ -+void tell_sched_cpu_down_done(int cpu) -+{ -+ mutex_lock(&sched_down_mutex); -+ cpumask_clear_cpu(cpu, &sched_down_cpumask); -+ mutex_unlock(&sched_down_mutex); -+} -+ -+/** -+ * migrate_me - try to move the current task off this cpu -+ * -+ * Used by the pin_current_cpu() code to try to get tasks -+ * to move off the current CPU as it is going down. -+ * It will only move the task if the task isn't pinned to -+ * the CPU (with migrate_disable, affinity or NO_SETAFFINITY) -+ * and the task has to be in a RUNNING state. Otherwise the -+ * movement of the task will wake it up (change its state -+ * to running) when the task did not expect it. -+ * -+ * Returns 1 if it succeeded in moving the current task -+ * 0 otherwise. -+ */ -+int migrate_me(void) -+{ -+ struct task_struct *p = current; -+ struct migration_arg arg; -+ struct cpumask *cpumask; -+ struct cpumask *mask; -+ unsigned long flags; -+ unsigned int dest_cpu; -+ struct rq *rq; -+ -+ /* -+ * We can not migrate tasks bounded to a CPU or tasks not -+ * running. The movement of the task will wake it up. -+ */ -+ if (p->flags & PF_NO_SETAFFINITY || p->state) -+ return 0; -+ -+ mutex_lock(&sched_down_mutex); -+ rq = task_rq_lock(p, &flags); -+ -+ cpumask = this_cpu_ptr(&sched_cpumasks); -+ mask = &p->cpus_allowed; -+ -+ cpumask_andnot(cpumask, mask, &sched_down_cpumask); -+ -+ if (!cpumask_weight(cpumask)) { -+ /* It's only on this CPU? */ -+ task_rq_unlock(rq, p, &flags); -+ mutex_unlock(&sched_down_mutex); -+ return 0; -+ } -+ -+ dest_cpu = cpumask_any_and(cpu_active_mask, cpumask); -+ -+ arg.task = p; -+ arg.dest_cpu = dest_cpu; -+ -+ task_rq_unlock(rq, p, &flags); -+ -+ stop_one_cpu(cpu_of(rq), migration_cpu_stop, &arg); -+ tlb_migrate_finish(p->mm); -+ mutex_unlock(&sched_down_mutex); -+ -+ return 1; -+} -+ - /* - * Change a given task's CPU affinity. Migrate the thread to a - * proper CPU and schedule it away if the CPU it's executing on -@@ -1112,7 +1240,7 @@ static int __set_cpus_allowed_ptr(struct task_struct *p, - do_set_cpus_allowed(p, new_mask); - - /* Can the task run on the task's current CPU? If so, we're done */ -- if (cpumask_test_cpu(task_cpu(p), new_mask)) -+ if (cpumask_test_cpu(task_cpu(p), new_mask) || __migrate_disabled(p)) - goto out; - - dest_cpu = cpumask_any_and(cpu_active_mask, new_mask); -@@ -1299,6 +1427,18 @@ int migrate_swap(struct task_struct *cur, struct task_struct *p) - return ret; - } - -+static bool check_task_state(struct task_struct *p, long match_state) -+{ -+ bool match = false; -+ -+ raw_spin_lock_irq(&p->pi_lock); -+ if (p->state == match_state || p->saved_state == match_state) -+ match = true; -+ raw_spin_unlock_irq(&p->pi_lock); -+ -+ return match; -+} -+ - /* - * wait_task_inactive - wait for a thread to unschedule. - * -@@ -1343,7 +1483,7 @@ unsigned long wait_task_inactive(struct task_struct *p, long match_state) - * is actually now running somewhere else! - */ - while (task_running(rq, p)) { -- if (match_state && unlikely(p->state != match_state)) -+ if (match_state && !check_task_state(p, match_state)) - return 0; - cpu_relax(); - } -@@ -1358,7 +1498,8 @@ unsigned long wait_task_inactive(struct task_struct *p, long match_state) - running = task_running(rq, p); - queued = task_on_rq_queued(p); - ncsw = 0; -- if (!match_state || p->state == match_state) -+ if (!match_state || p->state == match_state || -+ p->saved_state == match_state) - ncsw = p->nvcsw | LONG_MIN; /* sets MSB */ - task_rq_unlock(rq, p, &flags); - -@@ -1515,7 +1656,7 @@ int select_task_rq(struct task_struct *p, int cpu, int sd_flags, int wake_flags) - { - lockdep_assert_held(&p->pi_lock); - -- if (p->nr_cpus_allowed > 1) -+ if (tsk_nr_cpus_allowed(p) > 1) - cpu = p->sched_class->select_task_rq(p, cpu, sd_flags, wake_flags); - - /* -@@ -1595,10 +1736,6 @@ static inline void ttwu_activate(struct rq *rq, struct task_struct *p, int en_fl - { - activate_task(rq, p, en_flags); - p->on_rq = TASK_ON_RQ_QUEUED; -- -- /* if a worker is waking up, notify workqueue */ -- if (p->flags & PF_WQ_WORKER) -- wq_worker_waking_up(p, cpu_of(rq)); - } - - /* -@@ -1916,8 +2053,27 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags) - */ - smp_mb__before_spinlock(); - raw_spin_lock_irqsave(&p->pi_lock, flags); -- if (!(p->state & state)) -+ if (!(p->state & state)) { -+ /* -+ * The task might be running due to a spinlock sleeper -+ * wakeup. Check the saved state and set it to running -+ * if the wakeup condition is true. -+ */ -+ if (!(wake_flags & WF_LOCK_SLEEPER)) { -+ if (p->saved_state & state) { -+ p->saved_state = TASK_RUNNING; -+ success = 1; -+ } -+ } - goto out; -+ } -+ -+ /* -+ * If this is a regular wakeup, then we can unconditionally -+ * clear the saved state of a "lock sleeper". -+ */ -+ if (!(wake_flags & WF_LOCK_SLEEPER)) -+ p->saved_state = TASK_RUNNING; - - trace_sched_waking(p); - -@@ -1982,53 +2138,6 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags) - } - - /** -- * try_to_wake_up_local - try to wake up a local task with rq lock held -- * @p: the thread to be awakened -- * -- * Put @p on the run-queue if it's not already there. The caller must -- * ensure that this_rq() is locked, @p is bound to this_rq() and not -- * the current task. -- */ --static void try_to_wake_up_local(struct task_struct *p) --{ -- struct rq *rq = task_rq(p); -- -- if (WARN_ON_ONCE(rq != this_rq()) || -- WARN_ON_ONCE(p == current)) -- return; -- -- lockdep_assert_held(&rq->lock); -- -- if (!raw_spin_trylock(&p->pi_lock)) { -- /* -- * This is OK, because current is on_cpu, which avoids it being -- * picked for load-balance and preemption/IRQs are still -- * disabled avoiding further scheduler activity on it and we've -- * not yet picked a replacement task. -- */ -- lockdep_unpin_lock(&rq->lock); -- raw_spin_unlock(&rq->lock); -- raw_spin_lock(&p->pi_lock); -- raw_spin_lock(&rq->lock); -- lockdep_pin_lock(&rq->lock); -- } -- -- if (!(p->state & TASK_NORMAL)) -- goto out; -- -- trace_sched_waking(p); -- -- if (!task_on_rq_queued(p)) -- ttwu_activate(rq, p, ENQUEUE_WAKEUP); -- -- ttwu_do_wakeup(rq, p, 0); -- if (schedstat_enabled()) -- ttwu_stat(p, smp_processor_id(), 0); --out: -- raw_spin_unlock(&p->pi_lock); --} -- --/** - * wake_up_process - Wake up a specific process - * @p: The process to be woken up. - * -@@ -2046,6 +2155,18 @@ int wake_up_process(struct task_struct *p) - } - EXPORT_SYMBOL(wake_up_process); - -+/** -+ * wake_up_lock_sleeper - Wake up a specific process blocked on a "sleeping lock" -+ * @p: The process to be woken up. -+ * -+ * Same as wake_up_process() above, but wake_flags=WF_LOCK_SLEEPER to indicate -+ * the nature of the wakeup. -+ */ -+int wake_up_lock_sleeper(struct task_struct *p) -+{ -+ return try_to_wake_up(p, TASK_ALL, WF_LOCK_SLEEPER); -+} -+ - int wake_up_state(struct task_struct *p, unsigned int state) - { - return try_to_wake_up(p, state, 0); -@@ -2303,6 +2424,9 @@ int sched_fork(unsigned long clone_flags, struct task_struct *p) - p->on_cpu = 0; - #endif - init_task_preempt_count(p); -+#ifdef CONFIG_HAVE_PREEMPT_LAZY -+ task_thread_info(p)->preempt_lazy_count = 0; -+#endif - #ifdef CONFIG_SMP - plist_node_init(&p->pushable_tasks, MAX_PRIO); - RB_CLEAR_NODE(&p->pushable_dl_tasks); -@@ -2627,8 +2751,12 @@ static struct rq *finish_task_switch(struct task_struct *prev) - finish_arch_post_lock_switch(); - - fire_sched_in_preempt_notifiers(current); -+ /* -+ * We use mmdrop_delayed() here so we don't have to do the -+ * full __mmdrop() when we are the last user. -+ */ - if (mm) -- mmdrop(mm); -+ mmdrop_delayed(mm); - if (unlikely(prev_state == TASK_DEAD)) { - if (prev->sched_class->task_dead) - prev->sched_class->task_dead(prev); -@@ -3062,6 +3190,77 @@ static inline void schedule_debug(struct task_struct *prev) - schedstat_inc(this_rq(), sched_count); - } - -+#if defined(CONFIG_PREEMPT_RT_FULL) && defined(CONFIG_SMP) -+ -+void migrate_disable(void) -+{ -+ struct task_struct *p = current; -+ -+ if (in_atomic() || irqs_disabled()) { -+#ifdef CONFIG_SCHED_DEBUG -+ p->migrate_disable_atomic++; -+#endif -+ return; -+ } -+ -+#ifdef CONFIG_SCHED_DEBUG -+ if (unlikely(p->migrate_disable_atomic)) { -+ tracing_off(); -+ WARN_ON_ONCE(1); -+ } -+#endif -+ -+ if (p->migrate_disable) { -+ p->migrate_disable++; -+ return; -+ } -+ -+ preempt_disable(); -+ preempt_lazy_disable(); -+ pin_current_cpu(); -+ p->migrate_disable = 1; -+ preempt_enable(); -+} -+EXPORT_SYMBOL(migrate_disable); -+ -+void migrate_enable(void) -+{ -+ struct task_struct *p = current; -+ -+ if (in_atomic() || irqs_disabled()) { -+#ifdef CONFIG_SCHED_DEBUG -+ p->migrate_disable_atomic--; -+#endif -+ return; -+ } -+ -+#ifdef CONFIG_SCHED_DEBUG -+ if (unlikely(p->migrate_disable_atomic)) { -+ tracing_off(); -+ WARN_ON_ONCE(1); -+ } -+#endif -+ WARN_ON_ONCE(p->migrate_disable <= 0); -+ -+ if (p->migrate_disable > 1) { -+ p->migrate_disable--; -+ return; -+ } -+ -+ preempt_disable(); -+ /* -+ * Clearing migrate_disable causes tsk_cpus_allowed to -+ * show the tasks original cpu affinity. -+ */ -+ p->migrate_disable = 0; -+ -+ unpin_current_cpu(); -+ preempt_enable(); -+ preempt_lazy_enable(); -+} -+EXPORT_SYMBOL(migrate_enable); -+#endif -+ - /* - * Pick up the highest-prio task: - */ -@@ -3188,19 +3387,6 @@ static void __sched notrace __schedule(bool preempt) - } else { - deactivate_task(rq, prev, DEQUEUE_SLEEP); - prev->on_rq = 0; -- -- /* -- * If a worker went to sleep, notify and ask workqueue -- * whether it wants to wake up a task to maintain -- * concurrency. -- */ -- if (prev->flags & PF_WQ_WORKER) { -- struct task_struct *to_wakeup; -- -- to_wakeup = wq_worker_sleeping(prev); -- if (to_wakeup) -- try_to_wake_up_local(to_wakeup); -- } - } - switch_count = &prev->nvcsw; - } -@@ -3210,6 +3396,7 @@ static void __sched notrace __schedule(bool preempt) - - next = pick_next_task(rq, prev); - clear_tsk_need_resched(prev); -+ clear_tsk_need_resched_lazy(prev); - clear_preempt_need_resched(); - rq->clock_skip_update = 0; - -@@ -3231,9 +3418,20 @@ STACK_FRAME_NON_STANDARD(__schedule); /* switch_to() */ - - static inline void sched_submit_work(struct task_struct *tsk) - { -- if (!tsk->state || tsk_is_pi_blocked(tsk)) -+ if (!tsk->state) - return; - /* -+ * If a worker went to sleep, notify and ask workqueue whether -+ * it wants to wake up a task to maintain concurrency. -+ */ -+ if (tsk->flags & PF_WQ_WORKER) -+ wq_worker_sleeping(tsk); -+ -+ -+ if (tsk_is_pi_blocked(tsk)) -+ return; -+ -+ /* - * If we are going to sleep and we have plugged IO queued, - * make sure to submit it to avoid deadlocks. - */ -@@ -3241,6 +3439,12 @@ static inline void sched_submit_work(struct task_struct *tsk) - blk_schedule_flush_plug(tsk); - } - -+static void sched_update_worker(struct task_struct *tsk) -+{ -+ if (tsk->flags & PF_WQ_WORKER) -+ wq_worker_running(tsk); -+} -+ - asmlinkage __visible void __sched schedule(void) - { - struct task_struct *tsk = current; -@@ -3251,6 +3455,7 @@ asmlinkage __visible void __sched schedule(void) - __schedule(false); - sched_preempt_enable_no_resched(); - } while (need_resched()); -+ sched_update_worker(tsk); - } - EXPORT_SYMBOL(schedule); - -@@ -3299,6 +3504,30 @@ static void __sched notrace preempt_schedule_common(void) - } while (need_resched()); - } - -+#ifdef CONFIG_PREEMPT_LAZY -+/* -+ * If TIF_NEED_RESCHED is then we allow to be scheduled away since this is -+ * set by a RT task. Oterwise we try to avoid beeing scheduled out as long as -+ * preempt_lazy_count counter >0. -+ */ -+static __always_inline int preemptible_lazy(void) -+{ -+ if (test_thread_flag(TIF_NEED_RESCHED)) -+ return 1; -+ if (current_thread_info()->preempt_lazy_count) -+ return 0; -+ return 1; -+} -+ -+#else -+ -+static inline int preemptible_lazy(void) -+{ -+ return 1; -+} -+ -+#endif -+ - #ifdef CONFIG_PREEMPT - /* - * this is the entry point to schedule() from in-kernel preemption -@@ -3313,6 +3542,8 @@ asmlinkage __visible void __sched notrace preempt_schedule(void) - */ - if (likely(!preemptible())) - return; -+ if (!preemptible_lazy()) -+ return; - - preempt_schedule_common(); - } -@@ -3339,6 +3570,8 @@ asmlinkage __visible void __sched notrace preempt_schedule_notrace(void) - - if (likely(!preemptible())) - return; -+ if (!preemptible_lazy()) -+ return; - - do { - preempt_disable_notrace(); -@@ -3348,7 +3581,16 @@ asmlinkage __visible void __sched notrace preempt_schedule_notrace(void) - * an infinite recursion. - */ - prev_ctx = exception_enter(); -+ /* -+ * The add/subtract must not be traced by the function -+ * tracer. But we still want to account for the -+ * preempt off latency tracer. Since the _notrace versions -+ * of add/subtract skip the accounting for latency tracer -+ * we must force it manually. -+ */ -+ start_critical_timings(); - __schedule(true); -+ stop_critical_timings(); - exception_exit(prev_ctx); - - preempt_enable_no_resched_notrace(); -@@ -4693,6 +4935,7 @@ int __cond_resched_lock(spinlock_t *lock) - } - EXPORT_SYMBOL(__cond_resched_lock); - -+#ifndef CONFIG_PREEMPT_RT_FULL - int __sched __cond_resched_softirq(void) - { - BUG_ON(!in_softirq()); -@@ -4706,6 +4949,7 @@ int __sched __cond_resched_softirq(void) - return 0; - } - EXPORT_SYMBOL(__cond_resched_softirq); -+#endif - - /** - * yield - yield the current processor to other threads. -@@ -5072,7 +5316,9 @@ void init_idle(struct task_struct *idle, int cpu) - - /* Set the preempt count _outside_ the spinlocks! */ - init_idle_preempt_count(idle, cpu); -- -+#ifdef CONFIG_HAVE_PREEMPT_LAZY -+ task_thread_info(idle)->preempt_lazy_count = 0; -+#endif - /* - * The idle tasks have their own, simple scheduling class: - */ -@@ -5213,6 +5459,8 @@ void sched_setnuma(struct task_struct *p, int nid) - #endif /* CONFIG_NUMA_BALANCING */ - - #ifdef CONFIG_HOTPLUG_CPU -+static DEFINE_PER_CPU(struct mm_struct *, idle_last_mm); -+ - /* - * Ensures that the idle task is using init_mm right before its cpu goes - * offline. -@@ -5227,7 +5475,11 @@ void idle_task_exit(void) - switch_mm(mm, &init_mm, current); - finish_arch_post_lock_switch(); - } -- mmdrop(mm); -+ /* -+ * Defer the cleanup to an alive cpu. On RT we can neither -+ * call mmdrop() nor mmdrop_delayed() from here. -+ */ -+ per_cpu(idle_last_mm, smp_processor_id()) = mm; - } - - /* -@@ -5423,6 +5675,10 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu) - - case CPU_DEAD: - calc_load_migrate(rq); -+ if (per_cpu(idle_last_mm, cpu)) { -+ mmdrop(per_cpu(idle_last_mm, cpu)); -+ per_cpu(idle_last_mm, cpu) = NULL; -+ } - break; - #endif - } -@@ -7405,7 +7661,7 @@ void __init sched_init(void) - #ifdef CONFIG_DEBUG_ATOMIC_SLEEP - static inline int preempt_count_equals(int preempt_offset) - { -- int nested = preempt_count() + rcu_preempt_depth(); -+ int nested = preempt_count() + sched_rcu_preempt_depth(); - - return (nested == preempt_offset); - } -diff --git a/kernel/sched/cpudeadline.c b/kernel/sched/cpudeadline.c -index 5a75b08cfd85..5be58820465c 100644 ---- a/kernel/sched/cpudeadline.c -+++ b/kernel/sched/cpudeadline.c -@@ -103,10 +103,10 @@ int cpudl_find(struct cpudl *cp, struct task_struct *p, - const struct sched_dl_entity *dl_se = &p->dl; - - if (later_mask && -- cpumask_and(later_mask, cp->free_cpus, &p->cpus_allowed)) { -+ cpumask_and(later_mask, cp->free_cpus, tsk_cpus_allowed(p))) { - best_cpu = cpumask_any(later_mask); - goto out; -- } else if (cpumask_test_cpu(cpudl_maximum(cp), &p->cpus_allowed) && -+ } else if (cpumask_test_cpu(cpudl_maximum(cp), tsk_cpus_allowed(p)) && - dl_time_before(dl_se->deadline, cp->elements[0].dl)) { - best_cpu = cpudl_maximum(cp); - if (later_mask) -diff --git a/kernel/sched/cpupri.c b/kernel/sched/cpupri.c -index 981fcd7dc394..11e9705bf937 100644 ---- a/kernel/sched/cpupri.c -+++ b/kernel/sched/cpupri.c -@@ -103,11 +103,11 @@ int cpupri_find(struct cpupri *cp, struct task_struct *p, - if (skip) - continue; - -- if (cpumask_any_and(&p->cpus_allowed, vec->mask) >= nr_cpu_ids) -+ if (cpumask_any_and(tsk_cpus_allowed(p), vec->mask) >= nr_cpu_ids) - continue; - - if (lowest_mask) { -- cpumask_and(lowest_mask, &p->cpus_allowed, vec->mask); -+ cpumask_and(lowest_mask, tsk_cpus_allowed(p), vec->mask); - - /* - * We have to ensure that we have at least one bit -diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c -index 686ec8adf952..8099333b5e1d 100644 ---- a/kernel/sched/deadline.c -+++ b/kernel/sched/deadline.c -@@ -134,7 +134,7 @@ static void inc_dl_migration(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq) - { - struct task_struct *p = dl_task_of(dl_se); - -- if (p->nr_cpus_allowed > 1) -+ if (tsk_nr_cpus_allowed(p) > 1) - dl_rq->dl_nr_migratory++; - - update_dl_migration(dl_rq); -@@ -144,7 +144,7 @@ static void dec_dl_migration(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq) - { - struct task_struct *p = dl_task_of(dl_se); - -- if (p->nr_cpus_allowed > 1) -+ if (tsk_nr_cpus_allowed(p) > 1) - dl_rq->dl_nr_migratory--; - - update_dl_migration(dl_rq); -@@ -694,6 +694,7 @@ void init_dl_task_timer(struct sched_dl_entity *dl_se) - - hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); - timer->function = dl_task_timer; -+ timer->irqsafe = 1; - } - - static -@@ -966,7 +967,7 @@ static void enqueue_task_dl(struct rq *rq, struct task_struct *p, int flags) - - enqueue_dl_entity(&p->dl, pi_se, flags); - -- if (!task_current(rq, p) && p->nr_cpus_allowed > 1) -+ if (!task_current(rq, p) && tsk_nr_cpus_allowed(p) > 1) - enqueue_pushable_dl_task(rq, p); - } - -@@ -1040,9 +1041,9 @@ select_task_rq_dl(struct task_struct *p, int cpu, int sd_flag, int flags) - * try to make it stay here, it might be important. - */ - if (unlikely(dl_task(curr)) && -- (curr->nr_cpus_allowed < 2 || -+ (tsk_nr_cpus_allowed(curr) < 2 || - !dl_entity_preempt(&p->dl, &curr->dl)) && -- (p->nr_cpus_allowed > 1)) { -+ (tsk_nr_cpus_allowed(p) > 1)) { - int target = find_later_rq(p); - - if (target != -1 && -@@ -1063,7 +1064,7 @@ static void check_preempt_equal_dl(struct rq *rq, struct task_struct *p) - * Current can't be migrated, useless to reschedule, - * let's hope p can move out. - */ -- if (rq->curr->nr_cpus_allowed == 1 || -+ if (tsk_nr_cpus_allowed(rq->curr) == 1 || - cpudl_find(&rq->rd->cpudl, rq->curr, NULL) == -1) - return; - -@@ -1071,7 +1072,7 @@ static void check_preempt_equal_dl(struct rq *rq, struct task_struct *p) - * p is migratable, so let's not schedule it and - * see if it is pushed or pulled somewhere else. - */ -- if (p->nr_cpus_allowed != 1 && -+ if (tsk_nr_cpus_allowed(p) != 1 && - cpudl_find(&rq->rd->cpudl, p, NULL) != -1) - return; - -@@ -1185,7 +1186,7 @@ static void put_prev_task_dl(struct rq *rq, struct task_struct *p) - { - update_curr_dl(rq); - -- if (on_dl_rq(&p->dl) && p->nr_cpus_allowed > 1) -+ if (on_dl_rq(&p->dl) && tsk_nr_cpus_allowed(p) > 1) - enqueue_pushable_dl_task(rq, p); - } - -@@ -1286,7 +1287,7 @@ static int find_later_rq(struct task_struct *task) - if (unlikely(!later_mask)) - return -1; - -- if (task->nr_cpus_allowed == 1) -+ if (tsk_nr_cpus_allowed(task) == 1) - return -1; - - /* -@@ -1392,7 +1393,7 @@ static struct rq *find_lock_later_rq(struct task_struct *task, struct rq *rq) - if (double_lock_balance(rq, later_rq)) { - if (unlikely(task_rq(task) != rq || - !cpumask_test_cpu(later_rq->cpu, -- &task->cpus_allowed) || -+ tsk_cpus_allowed(task)) || - task_running(rq, task) || - !dl_task(task) || - !task_on_rq_queued(task))) { -@@ -1432,7 +1433,7 @@ static struct task_struct *pick_next_pushable_dl_task(struct rq *rq) - - BUG_ON(rq->cpu != task_cpu(p)); - BUG_ON(task_current(rq, p)); -- BUG_ON(p->nr_cpus_allowed <= 1); -+ BUG_ON(tsk_nr_cpus_allowed(p) <= 1); - - BUG_ON(!task_on_rq_queued(p)); - BUG_ON(!dl_task(p)); -@@ -1471,7 +1472,7 @@ static int push_dl_task(struct rq *rq) - */ - if (dl_task(rq->curr) && - dl_time_before(next_task->dl.deadline, rq->curr->dl.deadline) && -- rq->curr->nr_cpus_allowed > 1) { -+ tsk_nr_cpus_allowed(rq->curr) > 1) { - resched_curr(rq); - return 0; - } -@@ -1618,9 +1619,9 @@ static void task_woken_dl(struct rq *rq, struct task_struct *p) - { - if (!task_running(rq, p) && - !test_tsk_need_resched(rq->curr) && -- p->nr_cpus_allowed > 1 && -+ tsk_nr_cpus_allowed(p) > 1 && - dl_task(rq->curr) && -- (rq->curr->nr_cpus_allowed < 2 || -+ (tsk_nr_cpus_allowed(rq->curr) < 2 || - !dl_entity_preempt(&p->dl, &rq->curr->dl))) { - push_dl_tasks(rq); - } -@@ -1724,7 +1725,7 @@ static void switched_to_dl(struct rq *rq, struct task_struct *p) - - if (task_on_rq_queued(p) && rq->curr != p) { - #ifdef CONFIG_SMP -- if (p->nr_cpus_allowed > 1 && rq->dl.overloaded) -+ if (tsk_nr_cpus_allowed(p) > 1 && rq->dl.overloaded) - queue_push_tasks(rq); - #else - if (dl_task(rq->curr)) -diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c -index 4fbc3bd5ff60..5503c1f4290a 100644 ---- a/kernel/sched/debug.c -+++ b/kernel/sched/debug.c -@@ -559,6 +559,9 @@ void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq) - P(rt_throttled); - PN(rt_time); - PN(rt_runtime); -+#ifdef CONFIG_SMP -+ P(rt_nr_migratory); -+#endif - - #undef PN - #undef P -@@ -954,6 +957,10 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m) - #endif - P(policy); - P(prio); -+#ifdef CONFIG_PREEMPT_RT_FULL -+ P(migrate_disable); -+#endif -+ P(nr_cpus_allowed); - #undef PN - #undef __PN - #undef P -diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c -index eeaf920f46b9..3b66683e5b3f 100644 ---- a/kernel/sched/fair.c -+++ b/kernel/sched/fair.c -@@ -3335,7 +3335,7 @@ check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr) - ideal_runtime = sched_slice(cfs_rq, curr); - delta_exec = curr->sum_exec_runtime - curr->prev_sum_exec_runtime; - if (delta_exec > ideal_runtime) { -- resched_curr(rq_of(cfs_rq)); -+ resched_curr_lazy(rq_of(cfs_rq)); - /* - * The current task ran long enough, ensure it doesn't get - * re-elected due to buddy favours. -@@ -3359,7 +3359,7 @@ check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr) - return; - - if (delta > ideal_runtime) -- resched_curr(rq_of(cfs_rq)); -+ resched_curr_lazy(rq_of(cfs_rq)); - } - - static void -@@ -3504,7 +3504,7 @@ entity_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr, int queued) - * validating it and just reschedule. - */ - if (queued) { -- resched_curr(rq_of(cfs_rq)); -+ resched_curr_lazy(rq_of(cfs_rq)); - return; - } - /* -@@ -3686,7 +3686,7 @@ static void __account_cfs_rq_runtime(struct cfs_rq *cfs_rq, u64 delta_exec) - * hierarchy can be throttled - */ - if (!assign_cfs_rq_runtime(cfs_rq) && likely(cfs_rq->curr)) -- resched_curr(rq_of(cfs_rq)); -+ resched_curr_lazy(rq_of(cfs_rq)); - } - - static __always_inline -@@ -4298,7 +4298,7 @@ static void hrtick_start_fair(struct rq *rq, struct task_struct *p) - - if (delta < 0) { - if (rq->curr == p) -- resched_curr(rq); -+ resched_curr_lazy(rq); - return; - } - hrtick_start(rq, delta); -@@ -5438,7 +5438,7 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int wake_ - return; - - preempt: -- resched_curr(rq); -+ resched_curr_lazy(rq); - /* - * Only set the backward buddy when the current task is still - * on the rq. This can happen when a wakeup gets interleaved -@@ -8189,7 +8189,7 @@ static void task_fork_fair(struct task_struct *p) - * 'current' within the tree based on its new key value. - */ - swap(curr->vruntime, se->vruntime); -- resched_curr(rq); -+ resched_curr_lazy(rq); - } - - se->vruntime -= cfs_rq->min_vruntime; -@@ -8214,7 +8214,7 @@ prio_changed_fair(struct rq *rq, struct task_struct *p, int oldprio) - */ - if (rq->curr == p) { - if (p->prio > oldprio) -- resched_curr(rq); -+ resched_curr_lazy(rq); - } else - check_preempt_curr(rq, p, 0); - } -diff --git a/kernel/sched/features.h b/kernel/sched/features.h -index 69631fa46c2f..6d28fcd08872 100644 ---- a/kernel/sched/features.h -+++ b/kernel/sched/features.h -@@ -45,11 +45,19 @@ SCHED_FEAT(LB_BIAS, true) - */ - SCHED_FEAT(NONTASK_CAPACITY, true) - -+#ifdef CONFIG_PREEMPT_RT_FULL -+SCHED_FEAT(TTWU_QUEUE, false) -+# ifdef CONFIG_PREEMPT_LAZY -+SCHED_FEAT(PREEMPT_LAZY, true) -+# endif -+#else -+ - /* - * Queue remote wakeups on the target CPU and process them - * using the scheduler IPI. Reduces rq->lock contention/bounces. - */ - SCHED_FEAT(TTWU_QUEUE, true) -+#endif - - #ifdef HAVE_RT_PUSH_IPI - /* -diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c -index ec4f538d4396..f7b281059ddf 100644 ---- a/kernel/sched/rt.c -+++ b/kernel/sched/rt.c -@@ -47,6 +47,7 @@ void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime) - - hrtimer_init(&rt_b->rt_period_timer, - CLOCK_MONOTONIC, HRTIMER_MODE_REL); -+ rt_b->rt_period_timer.irqsafe = 1; - rt_b->rt_period_timer.function = sched_rt_period_timer; - } - -@@ -101,6 +102,7 @@ void init_rt_rq(struct rt_rq *rt_rq) - rt_rq->push_cpu = nr_cpu_ids; - raw_spin_lock_init(&rt_rq->push_lock); - init_irq_work(&rt_rq->push_work, push_irq_work_func); -+ rt_rq->push_work.flags |= IRQ_WORK_HARD_IRQ; - #endif - #endif /* CONFIG_SMP */ - /* We start is dequeued state, because no RT tasks are queued */ -@@ -334,7 +336,7 @@ static void inc_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq) - rt_rq = &rq_of_rt_rq(rt_rq)->rt; - - rt_rq->rt_nr_total++; -- if (p->nr_cpus_allowed > 1) -+ if (tsk_nr_cpus_allowed(p) > 1) - rt_rq->rt_nr_migratory++; - - update_rt_migration(rt_rq); -@@ -351,7 +353,7 @@ static void dec_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq) - rt_rq = &rq_of_rt_rq(rt_rq)->rt; - - rt_rq->rt_nr_total--; -- if (p->nr_cpus_allowed > 1) -+ if (tsk_nr_cpus_allowed(p) > 1) - rt_rq->rt_nr_migratory--; - - update_rt_migration(rt_rq); -@@ -1324,7 +1326,7 @@ enqueue_task_rt(struct rq *rq, struct task_struct *p, int flags) - - enqueue_rt_entity(rt_se, flags); - -- if (!task_current(rq, p) && p->nr_cpus_allowed > 1) -+ if (!task_current(rq, p) && tsk_nr_cpus_allowed(p) > 1) - enqueue_pushable_task(rq, p); - } - -@@ -1413,7 +1415,7 @@ select_task_rq_rt(struct task_struct *p, int cpu, int sd_flag, int flags) - * will have to sort it out. - */ - if (curr && unlikely(rt_task(curr)) && -- (curr->nr_cpus_allowed < 2 || -+ (tsk_nr_cpus_allowed(curr) < 2 || - curr->prio <= p->prio)) { - int target = find_lowest_rq(p); - -@@ -1437,7 +1439,7 @@ static void check_preempt_equal_prio(struct rq *rq, struct task_struct *p) - * Current can't be migrated, useless to reschedule, - * let's hope p can move out. - */ -- if (rq->curr->nr_cpus_allowed == 1 || -+ if (tsk_nr_cpus_allowed(rq->curr) == 1 || - !cpupri_find(&rq->rd->cpupri, rq->curr, NULL)) - return; - -@@ -1445,7 +1447,7 @@ static void check_preempt_equal_prio(struct rq *rq, struct task_struct *p) - * p is migratable, so let's not schedule it and - * see if it is pushed or pulled somewhere else. - */ -- if (p->nr_cpus_allowed != 1 -+ if (tsk_nr_cpus_allowed(p) != 1 - && cpupri_find(&rq->rd->cpupri, p, NULL)) - return; - -@@ -1579,7 +1581,7 @@ static void put_prev_task_rt(struct rq *rq, struct task_struct *p) - * The previous task needs to be made eligible for pushing - * if it is still active - */ -- if (on_rt_rq(&p->rt) && p->nr_cpus_allowed > 1) -+ if (on_rt_rq(&p->rt) && tsk_nr_cpus_allowed(p) > 1) - enqueue_pushable_task(rq, p); - } - -@@ -1629,7 +1631,7 @@ static int find_lowest_rq(struct task_struct *task) - if (unlikely(!lowest_mask)) - return -1; - -- if (task->nr_cpus_allowed == 1) -+ if (tsk_nr_cpus_allowed(task) == 1) - return -1; /* No other targets possible */ - - if (!cpupri_find(&task_rq(task)->rd->cpupri, task, lowest_mask)) -@@ -1762,7 +1764,7 @@ static struct task_struct *pick_next_pushable_task(struct rq *rq) - - BUG_ON(rq->cpu != task_cpu(p)); - BUG_ON(task_current(rq, p)); -- BUG_ON(p->nr_cpus_allowed <= 1); -+ BUG_ON(tsk_nr_cpus_allowed(p) <= 1); - - BUG_ON(!task_on_rq_queued(p)); - BUG_ON(!rt_task(p)); -@@ -2122,9 +2124,9 @@ static void task_woken_rt(struct rq *rq, struct task_struct *p) - { - if (!task_running(rq, p) && - !test_tsk_need_resched(rq->curr) && -- p->nr_cpus_allowed > 1 && -+ tsk_nr_cpus_allowed(p) > 1 && - (dl_task(rq->curr) || rt_task(rq->curr)) && -- (rq->curr->nr_cpus_allowed < 2 || -+ (tsk_nr_cpus_allowed(rq->curr) < 2 || - rq->curr->prio <= p->prio)) - push_rt_tasks(rq); - } -@@ -2197,7 +2199,7 @@ static void switched_to_rt(struct rq *rq, struct task_struct *p) - */ - if (task_on_rq_queued(p) && rq->curr != p) { - #ifdef CONFIG_SMP -- if (p->nr_cpus_allowed > 1 && rq->rt.overloaded) -+ if (tsk_nr_cpus_allowed(p) > 1 && rq->rt.overloaded) - queue_push_tasks(rq); - #else - if (p->prio < rq->curr->prio) -diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h -index ec2e8d23527e..93c999cbe58f 100644 ---- a/kernel/sched/sched.h -+++ b/kernel/sched/sched.h -@@ -1128,6 +1128,7 @@ static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev) - #define WF_SYNC 0x01 /* waker goes to sleep after wakeup */ - #define WF_FORK 0x02 /* child wakeup after fork */ - #define WF_MIGRATED 0x4 /* internal use, task got migrated */ -+#define WF_LOCK_SLEEPER 0x08 /* wakeup spinlock "sleeper" */ - - /* - * To aid in avoiding the subversion of "niceness" due to uneven distribution -@@ -1303,6 +1304,15 @@ extern void init_sched_fair_class(void); - extern void resched_curr(struct rq *rq); - extern void resched_cpu(int cpu); - -+#ifdef CONFIG_PREEMPT_LAZY -+extern void resched_curr_lazy(struct rq *rq); -+#else -+static inline void resched_curr_lazy(struct rq *rq) -+{ -+ resched_curr(rq); -+} -+#endif -+ - extern struct rt_bandwidth def_rt_bandwidth; - extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime); - -diff --git a/kernel/sched/swait.c b/kernel/sched/swait.c -index 82f0dff90030..e2e224c59c0a 100644 ---- a/kernel/sched/swait.c -+++ b/kernel/sched/swait.c -@@ -1,5 +1,6 @@ - #include <linux/sched.h> - #include <linux/swait.h> -+#include <linux/suspend.h> - - void __init_swait_queue_head(struct swait_queue_head *q, const char *name, - struct lock_class_key *key) -@@ -29,6 +30,25 @@ void swake_up_locked(struct swait_queue_head *q) - } - EXPORT_SYMBOL(swake_up_locked); - -+void swake_up_all_locked(struct swait_queue_head *q) -+{ -+ struct swait_queue *curr; -+ int wakes = 0; -+ -+ while (!list_empty(&q->task_list)) { -+ -+ curr = list_first_entry(&q->task_list, typeof(*curr), -+ task_list); -+ wake_up_process(curr->task); -+ list_del_init(&curr->task_list); -+ wakes++; -+ } -+ if (pm_in_action) -+ return; -+ WARN(wakes > 2, "complete_all() with %d waiters\n", wakes); -+} -+EXPORT_SYMBOL(swake_up_all_locked); -+ - void swake_up(struct swait_queue_head *q) - { - unsigned long flags; -diff --git a/kernel/sched/swork.c b/kernel/sched/swork.c -new file mode 100644 -index 000000000000..1950f40ca725 ---- /dev/null -+++ b/kernel/sched/swork.c -@@ -0,0 +1,173 @@ -+/* -+ * Copyright (C) 2014 BMW Car IT GmbH, Daniel Wagner daniel.wagner@bmw-carit.de -+ * -+ * Provides a framework for enqueuing callbacks from irq context -+ * PREEMPT_RT_FULL safe. The callbacks are executed in kthread context. -+ */ -+ -+#include <linux/swait.h> -+#include <linux/swork.h> -+#include <linux/kthread.h> -+#include <linux/slab.h> -+#include <linux/spinlock.h> -+#include <linux/export.h> -+ -+#define SWORK_EVENT_PENDING (1 << 0) -+ -+static DEFINE_MUTEX(worker_mutex); -+static struct sworker *glob_worker; -+ -+struct sworker { -+ struct list_head events; -+ struct swait_queue_head wq; -+ -+ raw_spinlock_t lock; -+ -+ struct task_struct *task; -+ int refs; -+}; -+ -+static bool swork_readable(struct sworker *worker) -+{ -+ bool r; -+ -+ if (kthread_should_stop()) -+ return true; -+ -+ raw_spin_lock_irq(&worker->lock); -+ r = !list_empty(&worker->events); -+ raw_spin_unlock_irq(&worker->lock); -+ -+ return r; -+} -+ -+static int swork_kthread(void *arg) -+{ -+ struct sworker *worker = arg; -+ -+ for (;;) { -+ swait_event_interruptible(worker->wq, -+ swork_readable(worker)); -+ if (kthread_should_stop()) -+ break; -+ -+ raw_spin_lock_irq(&worker->lock); -+ while (!list_empty(&worker->events)) { -+ struct swork_event *sev; -+ -+ sev = list_first_entry(&worker->events, -+ struct swork_event, item); -+ list_del(&sev->item); -+ raw_spin_unlock_irq(&worker->lock); -+ -+ WARN_ON_ONCE(!test_and_clear_bit(SWORK_EVENT_PENDING, -+ &sev->flags)); -+ sev->func(sev); -+ raw_spin_lock_irq(&worker->lock); -+ } -+ raw_spin_unlock_irq(&worker->lock); -+ } -+ return 0; -+} -+ -+static struct sworker *swork_create(void) -+{ -+ struct sworker *worker; -+ -+ worker = kzalloc(sizeof(*worker), GFP_KERNEL); -+ if (!worker) -+ return ERR_PTR(-ENOMEM); -+ -+ INIT_LIST_HEAD(&worker->events); -+ raw_spin_lock_init(&worker->lock); -+ init_swait_queue_head(&worker->wq); -+ -+ worker->task = kthread_run(swork_kthread, worker, "kswork"); -+ if (IS_ERR(worker->task)) { -+ kfree(worker); -+ return ERR_PTR(-ENOMEM); -+ } -+ -+ return worker; -+} -+ -+static void swork_destroy(struct sworker *worker) -+{ -+ kthread_stop(worker->task); -+ -+ WARN_ON(!list_empty(&worker->events)); -+ kfree(worker); -+} -+ -+/** -+ * swork_queue - queue swork -+ * -+ * Returns %false if @work was already on a queue, %true otherwise. -+ * -+ * The work is queued and processed on a random CPU -+ */ -+bool swork_queue(struct swork_event *sev) -+{ -+ unsigned long flags; -+ -+ if (test_and_set_bit(SWORK_EVENT_PENDING, &sev->flags)) -+ return false; -+ -+ raw_spin_lock_irqsave(&glob_worker->lock, flags); -+ list_add_tail(&sev->item, &glob_worker->events); -+ raw_spin_unlock_irqrestore(&glob_worker->lock, flags); -+ -+ swake_up(&glob_worker->wq); -+ return true; -+} -+EXPORT_SYMBOL_GPL(swork_queue); -+ -+/** -+ * swork_get - get an instance of the sworker -+ * -+ * Returns an negative error code if the initialization if the worker did not -+ * work, %0 otherwise. -+ * -+ */ -+int swork_get(void) -+{ -+ struct sworker *worker; -+ -+ mutex_lock(&worker_mutex); -+ if (!glob_worker) { -+ worker = swork_create(); -+ if (IS_ERR(worker)) { -+ mutex_unlock(&worker_mutex); -+ return -ENOMEM; -+ } -+ -+ glob_worker = worker; -+ } -+ -+ glob_worker->refs++; -+ mutex_unlock(&worker_mutex); -+ -+ return 0; -+} -+EXPORT_SYMBOL_GPL(swork_get); -+ -+/** -+ * swork_put - puts an instance of the sworker -+ * -+ * Will destroy the sworker thread. This function must not be called until all -+ * queued events have been completed. -+ */ -+void swork_put(void) -+{ -+ mutex_lock(&worker_mutex); -+ -+ glob_worker->refs--; -+ if (glob_worker->refs > 0) -+ goto out; -+ -+ swork_destroy(glob_worker); -+ glob_worker = NULL; -+out: -+ mutex_unlock(&worker_mutex); -+} -+EXPORT_SYMBOL_GPL(swork_put); -diff --git a/kernel/signal.c b/kernel/signal.c -index aa9bf00749c1..0a625c7b8792 100644 ---- a/kernel/signal.c -+++ b/kernel/signal.c -@@ -14,6 +14,7 @@ - #include <linux/export.h> - #include <linux/init.h> - #include <linux/sched.h> -+#include <linux/sched/rt.h> - #include <linux/fs.h> - #include <linux/tty.h> - #include <linux/binfmts.h> -@@ -352,13 +353,30 @@ static bool task_participate_group_stop(struct task_struct *task) - return false; - } - -+static inline struct sigqueue *get_task_cache(struct task_struct *t) -+{ -+ struct sigqueue *q = t->sigqueue_cache; -+ -+ if (cmpxchg(&t->sigqueue_cache, q, NULL) != q) -+ return NULL; -+ return q; -+} -+ -+static inline int put_task_cache(struct task_struct *t, struct sigqueue *q) -+{ -+ if (cmpxchg(&t->sigqueue_cache, NULL, q) == NULL) -+ return 0; -+ return 1; -+} -+ - /* - * allocate a new signal queue record - * - this may be called without locks if and only if t == current, otherwise an - * appropriate lock must be held to stop the target task from exiting - */ - static struct sigqueue * --__sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, int override_rlimit) -+__sigqueue_do_alloc(int sig, struct task_struct *t, gfp_t flags, -+ int override_rlimit, int fromslab) - { - struct sigqueue *q = NULL; - struct user_struct *user; -@@ -375,7 +393,10 @@ __sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, int override_rlimi - if (override_rlimit || - atomic_read(&user->sigpending) <= - task_rlimit(t, RLIMIT_SIGPENDING)) { -- q = kmem_cache_alloc(sigqueue_cachep, flags); -+ if (!fromslab) -+ q = get_task_cache(t); -+ if (!q) -+ q = kmem_cache_alloc(sigqueue_cachep, flags); - } else { - print_dropped_signal(sig); - } -@@ -392,6 +413,13 @@ __sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, int override_rlimi - return q; - } - -+static struct sigqueue * -+__sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, -+ int override_rlimit) -+{ -+ return __sigqueue_do_alloc(sig, t, flags, override_rlimit, 0); -+} -+ - static void __sigqueue_free(struct sigqueue *q) - { - if (q->flags & SIGQUEUE_PREALLOC) -@@ -401,6 +429,21 @@ static void __sigqueue_free(struct sigqueue *q) - kmem_cache_free(sigqueue_cachep, q); - } - -+static void sigqueue_free_current(struct sigqueue *q) -+{ -+ struct user_struct *up; -+ -+ if (q->flags & SIGQUEUE_PREALLOC) -+ return; -+ -+ up = q->user; -+ if (rt_prio(current->normal_prio) && !put_task_cache(current, q)) { -+ atomic_dec(&up->sigpending); -+ free_uid(up); -+ } else -+ __sigqueue_free(q); -+} -+ - void flush_sigqueue(struct sigpending *queue) - { - struct sigqueue *q; -@@ -414,6 +457,21 @@ void flush_sigqueue(struct sigpending *queue) - } - - /* -+ * Called from __exit_signal. Flush tsk->pending and -+ * tsk->sigqueue_cache -+ */ -+void flush_task_sigqueue(struct task_struct *tsk) -+{ -+ struct sigqueue *q; -+ -+ flush_sigqueue(&tsk->pending); -+ -+ q = get_task_cache(tsk); -+ if (q) -+ kmem_cache_free(sigqueue_cachep, q); -+} -+ -+/* - * Flush all pending signals for this kthread. - */ - void flush_signals(struct task_struct *t) -@@ -525,7 +583,7 @@ static void collect_signal(int sig, struct sigpending *list, siginfo_t *info) - still_pending: - list_del_init(&first->list); - copy_siginfo(info, &first->info); -- __sigqueue_free(first); -+ sigqueue_free_current(first); - } else { - /* - * Ok, it wasn't in the queue. This must be -@@ -560,6 +618,8 @@ int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) - { - int signr; - -+ WARN_ON_ONCE(tsk != current); -+ - /* We only dequeue private signals from ourselves, we don't let - * signalfd steal them - */ -@@ -1156,8 +1216,8 @@ int do_send_sig_info(int sig, struct siginfo *info, struct task_struct *p, - * We don't want to have recursive SIGSEGV's etc, for example, - * that is why we also clear SIGNAL_UNKILLABLE. - */ --int --force_sig_info(int sig, struct siginfo *info, struct task_struct *t) -+static int -+do_force_sig_info(int sig, struct siginfo *info, struct task_struct *t) - { - unsigned long int flags; - int ret, blocked, ignored; -@@ -1182,6 +1242,39 @@ force_sig_info(int sig, struct siginfo *info, struct task_struct *t) - return ret; - } - -+int force_sig_info(int sig, struct siginfo *info, struct task_struct *t) -+{ -+/* -+ * On some archs, PREEMPT_RT has to delay sending a signal from a trap -+ * since it can not enable preemption, and the signal code's spin_locks -+ * turn into mutexes. Instead, it must set TIF_NOTIFY_RESUME which will -+ * send the signal on exit of the trap. -+ */ -+#ifdef ARCH_RT_DELAYS_SIGNAL_SEND -+ if (in_atomic()) { -+ if (WARN_ON_ONCE(t != current)) -+ return 0; -+ if (WARN_ON_ONCE(t->forced_info.si_signo)) -+ return 0; -+ -+ if (is_si_special(info)) { -+ WARN_ON_ONCE(info != SEND_SIG_PRIV); -+ t->forced_info.si_signo = sig; -+ t->forced_info.si_errno = 0; -+ t->forced_info.si_code = SI_KERNEL; -+ t->forced_info.si_pid = 0; -+ t->forced_info.si_uid = 0; -+ } else { -+ t->forced_info = *info; -+ } -+ -+ set_tsk_thread_flag(t, TIF_NOTIFY_RESUME); -+ return 0; -+ } -+#endif -+ return do_force_sig_info(sig, info, t); -+} -+ - /* - * Nuke all other threads in the group. - */ -@@ -1216,12 +1309,12 @@ struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, - * Disable interrupts early to avoid deadlocks. - * See rcu_read_unlock() comment header for details. - */ -- local_irq_save(*flags); -+ local_irq_save_nort(*flags); - rcu_read_lock(); - sighand = rcu_dereference(tsk->sighand); - if (unlikely(sighand == NULL)) { - rcu_read_unlock(); -- local_irq_restore(*flags); -+ local_irq_restore_nort(*flags); - break; - } - /* -@@ -1242,7 +1335,7 @@ struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, - } - spin_unlock(&sighand->siglock); - rcu_read_unlock(); -- local_irq_restore(*flags); -+ local_irq_restore_nort(*flags); - } - - return sighand; -@@ -1485,7 +1578,8 @@ EXPORT_SYMBOL(kill_pid); - */ - struct sigqueue *sigqueue_alloc(void) - { -- struct sigqueue *q = __sigqueue_alloc(-1, current, GFP_KERNEL, 0); -+ /* Preallocated sigqueue objects always from the slabcache ! */ -+ struct sigqueue *q = __sigqueue_do_alloc(-1, current, GFP_KERNEL, 0, 1); - - if (q) - q->flags |= SIGQUEUE_PREALLOC; -@@ -1846,15 +1940,7 @@ static void ptrace_stop(int exit_code, int why, int clear_code, siginfo_t *info) - if (gstop_done && ptrace_reparented(current)) - do_notify_parent_cldstop(current, false, why); - -- /* -- * Don't want to allow preemption here, because -- * sys_ptrace() needs this task to be inactive. -- * -- * XXX: implement read_unlock_no_resched(). -- */ -- preempt_disable(); - read_unlock(&tasklist_lock); -- preempt_enable_no_resched(); - freezable_schedule(); - } else { - /* -@@ -2751,23 +2837,18 @@ int copy_siginfo_to_user(siginfo_t __user *to, const siginfo_t *from) - * @ts: upper bound on process time suspension - */ - int do_sigtimedwait(const sigset_t *which, siginfo_t *info, -- const struct timespec *ts) -+ const struct timespec *ts) - { -+ ktime_t *to = NULL, timeout = { .tv64 = KTIME_MAX }; - struct task_struct *tsk = current; -- long timeout = MAX_SCHEDULE_TIMEOUT; - sigset_t mask = *which; -- int sig; -+ int sig, ret = 0; - - if (ts) { - if (!timespec_valid(ts)) - return -EINVAL; -- timeout = timespec_to_jiffies(ts); -- /* -- * We can be close to the next tick, add another one -- * to ensure we will wait at least the time asked for. -- */ -- if (ts->tv_sec || ts->tv_nsec) -- timeout++; -+ timeout = timespec_to_ktime(*ts); -+ to = &timeout; - } - - /* -@@ -2778,7 +2859,7 @@ int do_sigtimedwait(const sigset_t *which, siginfo_t *info, - - spin_lock_irq(&tsk->sighand->siglock); - sig = dequeue_signal(tsk, &mask, info); -- if (!sig && timeout) { -+ if (!sig && timeout.tv64) { - /* - * None ready, temporarily unblock those we're interested - * while we are sleeping in so that we'll be awakened when -@@ -2790,8 +2871,9 @@ int do_sigtimedwait(const sigset_t *which, siginfo_t *info, - recalc_sigpending(); - spin_unlock_irq(&tsk->sighand->siglock); - -- timeout = freezable_schedule_timeout_interruptible(timeout); -- -+ __set_current_state(TASK_INTERRUPTIBLE); -+ ret = freezable_schedule_hrtimeout_range(to, tsk->timer_slack_ns, -+ HRTIMER_MODE_REL); - spin_lock_irq(&tsk->sighand->siglock); - __set_task_blocked(tsk, &tsk->real_blocked); - sigemptyset(&tsk->real_blocked); -@@ -2801,7 +2883,7 @@ int do_sigtimedwait(const sigset_t *which, siginfo_t *info, - - if (sig) - return sig; -- return timeout ? -EINTR : -EAGAIN; -+ return ret ? -EINTR : -EAGAIN; - } - - /** -diff --git a/kernel/softirq.c b/kernel/softirq.c -index 17caf4b63342..a602b7152de7 100644 ---- a/kernel/softirq.c -+++ b/kernel/softirq.c -@@ -21,10 +21,12 @@ - #include <linux/freezer.h> - #include <linux/kthread.h> - #include <linux/rcupdate.h> -+#include <linux/delay.h> - #include <linux/ftrace.h> - #include <linux/smp.h> - #include <linux/smpboot.h> - #include <linux/tick.h> -+#include <linux/locallock.h> - #include <linux/irq.h> - - #define CREATE_TRACE_POINTS -@@ -56,12 +58,108 @@ EXPORT_SYMBOL(irq_stat); - static struct softirq_action softirq_vec[NR_SOFTIRQS] __cacheline_aligned_in_smp; - - DEFINE_PER_CPU(struct task_struct *, ksoftirqd); -+#ifdef CONFIG_PREEMPT_RT_FULL -+#define TIMER_SOFTIRQS ((1 << TIMER_SOFTIRQ) | (1 << HRTIMER_SOFTIRQ)) -+DEFINE_PER_CPU(struct task_struct *, ktimer_softirqd); -+#endif - - const char * const softirq_to_name[NR_SOFTIRQS] = { - "HI", "TIMER", "NET_TX", "NET_RX", "BLOCK", "BLOCK_IOPOLL", - "TASKLET", "SCHED", "HRTIMER", "RCU" - }; - -+#ifdef CONFIG_NO_HZ_COMMON -+# ifdef CONFIG_PREEMPT_RT_FULL -+ -+struct softirq_runner { -+ struct task_struct *runner[NR_SOFTIRQS]; -+}; -+ -+static DEFINE_PER_CPU(struct softirq_runner, softirq_runners); -+ -+static inline void softirq_set_runner(unsigned int sirq) -+{ -+ struct softirq_runner *sr = this_cpu_ptr(&softirq_runners); -+ -+ sr->runner[sirq] = current; -+} -+ -+static inline void softirq_clr_runner(unsigned int sirq) -+{ -+ struct softirq_runner *sr = this_cpu_ptr(&softirq_runners); -+ -+ sr->runner[sirq] = NULL; -+} -+ -+/* -+ * On preempt-rt a softirq running context might be blocked on a -+ * lock. There might be no other runnable task on this CPU because the -+ * lock owner runs on some other CPU. So we have to go into idle with -+ * the pending bit set. Therefor we need to check this otherwise we -+ * warn about false positives which confuses users and defeats the -+ * whole purpose of this test. -+ * -+ * This code is called with interrupts disabled. -+ */ -+void softirq_check_pending_idle(void) -+{ -+ static int rate_limit; -+ struct softirq_runner *sr = this_cpu_ptr(&softirq_runners); -+ u32 warnpending; -+ int i; -+ -+ if (rate_limit >= 10) -+ return; -+ -+ warnpending = local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK; -+ for (i = 0; i < NR_SOFTIRQS; i++) { -+ struct task_struct *tsk = sr->runner[i]; -+ -+ /* -+ * The wakeup code in rtmutex.c wakes up the task -+ * _before_ it sets pi_blocked_on to NULL under -+ * tsk->pi_lock. So we need to check for both: state -+ * and pi_blocked_on. -+ */ -+ if (tsk) { -+ raw_spin_lock(&tsk->pi_lock); -+ if (tsk->pi_blocked_on || tsk->state == TASK_RUNNING) { -+ /* Clear all bits pending in that task */ -+ warnpending &= ~(tsk->softirqs_raised); -+ warnpending &= ~(1 << i); -+ } -+ raw_spin_unlock(&tsk->pi_lock); -+ } -+ } -+ -+ if (warnpending) { -+ printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n", -+ warnpending); -+ rate_limit++; -+ } -+} -+# else -+/* -+ * On !PREEMPT_RT we just printk rate limited: -+ */ -+void softirq_check_pending_idle(void) -+{ -+ static int rate_limit; -+ -+ if (rate_limit < 10 && -+ (local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK)) { -+ printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n", -+ local_softirq_pending()); -+ rate_limit++; -+ } -+} -+# endif -+ -+#else /* !CONFIG_NO_HZ_COMMON */ -+static inline void softirq_set_runner(unsigned int sirq) { } -+static inline void softirq_clr_runner(unsigned int sirq) { } -+#endif -+ - /* - * we cannot loop indefinitely here to avoid userspace starvation, - * but we also don't want to introduce a worst case 1/HZ latency -@@ -77,6 +175,79 @@ static void wakeup_softirqd(void) - wake_up_process(tsk); - } - -+#ifdef CONFIG_PREEMPT_RT_FULL -+static void wakeup_timer_softirqd(void) -+{ -+ /* Interrupts are disabled: no need to stop preemption */ -+ struct task_struct *tsk = __this_cpu_read(ktimer_softirqd); -+ -+ if (tsk && tsk->state != TASK_RUNNING) -+ wake_up_process(tsk); -+} -+#endif -+ -+static void handle_softirq(unsigned int vec_nr) -+{ -+ struct softirq_action *h = softirq_vec + vec_nr; -+ int prev_count; -+ -+ prev_count = preempt_count(); -+ -+ kstat_incr_softirqs_this_cpu(vec_nr); -+ -+ trace_softirq_entry(vec_nr); -+ h->action(h); -+ trace_softirq_exit(vec_nr); -+ if (unlikely(prev_count != preempt_count())) { -+ pr_err("huh, entered softirq %u %s %p with preempt_count %08x, exited with %08x?\n", -+ vec_nr, softirq_to_name[vec_nr], h->action, -+ prev_count, preempt_count()); -+ preempt_count_set(prev_count); -+ } -+} -+ -+#ifndef CONFIG_PREEMPT_RT_FULL -+static inline int ksoftirqd_softirq_pending(void) -+{ -+ return local_softirq_pending(); -+} -+ -+static void handle_pending_softirqs(u32 pending) -+{ -+ struct softirq_action *h = softirq_vec; -+ int softirq_bit; -+ -+ local_irq_enable(); -+ -+ h = softirq_vec; -+ -+ while ((softirq_bit = ffs(pending))) { -+ unsigned int vec_nr; -+ -+ h += softirq_bit - 1; -+ vec_nr = h - softirq_vec; -+ handle_softirq(vec_nr); -+ -+ h++; -+ pending >>= softirq_bit; -+ } -+ -+ rcu_bh_qs(); -+ local_irq_disable(); -+} -+ -+static void run_ksoftirqd(unsigned int cpu) -+{ -+ local_irq_disable(); -+ if (ksoftirqd_softirq_pending()) { -+ __do_softirq(); -+ local_irq_enable(); -+ cond_resched_rcu_qs(); -+ return; -+ } -+ local_irq_enable(); -+} -+ - /* - * preempt_count and SOFTIRQ_OFFSET usage: - * - preempt_count is changed by SOFTIRQ_OFFSET on entering or leaving -@@ -232,10 +403,8 @@ asmlinkage __visible void __softirq_entry __do_softirq(void) - unsigned long end = jiffies + MAX_SOFTIRQ_TIME; - unsigned long old_flags = current->flags; - int max_restart = MAX_SOFTIRQ_RESTART; -- struct softirq_action *h; - bool in_hardirq; - __u32 pending; -- int softirq_bit; - - /* - * Mask out PF_MEMALLOC s current task context is borrowed for the -@@ -254,36 +423,7 @@ asmlinkage __visible void __softirq_entry __do_softirq(void) - /* Reset the pending bitmask before enabling irqs */ - set_softirq_pending(0); - -- local_irq_enable(); -- -- h = softirq_vec; -- -- while ((softirq_bit = ffs(pending))) { -- unsigned int vec_nr; -- int prev_count; -- -- h += softirq_bit - 1; -- -- vec_nr = h - softirq_vec; -- prev_count = preempt_count(); -- -- kstat_incr_softirqs_this_cpu(vec_nr); -- -- trace_softirq_entry(vec_nr); -- h->action(h); -- trace_softirq_exit(vec_nr); -- if (unlikely(prev_count != preempt_count())) { -- pr_err("huh, entered softirq %u %s %p with preempt_count %08x, exited with %08x?\n", -- vec_nr, softirq_to_name[vec_nr], h->action, -- prev_count, preempt_count()); -- preempt_count_set(prev_count); -- } -- h++; -- pending >>= softirq_bit; -- } -- -- rcu_bh_qs(); -- local_irq_disable(); -+ handle_pending_softirqs(pending); - - pending = local_softirq_pending(); - if (pending) { -@@ -320,6 +460,310 @@ asmlinkage __visible void do_softirq(void) - } - - /* -+ * This function must run with irqs disabled! -+ */ -+void raise_softirq_irqoff(unsigned int nr) -+{ -+ __raise_softirq_irqoff(nr); -+ -+ /* -+ * If we're in an interrupt or softirq, we're done -+ * (this also catches softirq-disabled code). We will -+ * actually run the softirq once we return from -+ * the irq or softirq. -+ * -+ * Otherwise we wake up ksoftirqd to make sure we -+ * schedule the softirq soon. -+ */ -+ if (!in_interrupt()) -+ wakeup_softirqd(); -+} -+ -+void __raise_softirq_irqoff(unsigned int nr) -+{ -+ trace_softirq_raise(nr); -+ or_softirq_pending(1UL << nr); -+} -+ -+static inline void local_bh_disable_nort(void) { local_bh_disable(); } -+static inline void _local_bh_enable_nort(void) { _local_bh_enable(); } -+static void ksoftirqd_set_sched_params(unsigned int cpu) { } -+ -+#else /* !PREEMPT_RT_FULL */ -+ -+/* -+ * On RT we serialize softirq execution with a cpu local lock per softirq -+ */ -+static DEFINE_PER_CPU(struct local_irq_lock [NR_SOFTIRQS], local_softirq_locks); -+ -+void __init softirq_early_init(void) -+{ -+ int i; -+ -+ for (i = 0; i < NR_SOFTIRQS; i++) -+ local_irq_lock_init(local_softirq_locks[i]); -+} -+ -+static void lock_softirq(int which) -+{ -+ local_lock(local_softirq_locks[which]); -+} -+ -+static void unlock_softirq(int which) -+{ -+ local_unlock(local_softirq_locks[which]); -+} -+ -+static void do_single_softirq(int which) -+{ -+ unsigned long old_flags = current->flags; -+ -+ current->flags &= ~PF_MEMALLOC; -+ vtime_account_irq_enter(current); -+ current->flags |= PF_IN_SOFTIRQ; -+ lockdep_softirq_enter(); -+ local_irq_enable(); -+ handle_softirq(which); -+ local_irq_disable(); -+ lockdep_softirq_exit(); -+ current->flags &= ~PF_IN_SOFTIRQ; -+ vtime_account_irq_enter(current); -+ tsk_restore_flags(current, old_flags, PF_MEMALLOC); -+} -+ -+/* -+ * Called with interrupts disabled. Process softirqs which were raised -+ * in current context (or on behalf of ksoftirqd). -+ */ -+static void do_current_softirqs(void) -+{ -+ while (current->softirqs_raised) { -+ int i = __ffs(current->softirqs_raised); -+ unsigned int pending, mask = (1U << i); -+ -+ current->softirqs_raised &= ~mask; -+ local_irq_enable(); -+ -+ /* -+ * If the lock is contended, we boost the owner to -+ * process the softirq or leave the critical section -+ * now. -+ */ -+ lock_softirq(i); -+ local_irq_disable(); -+ softirq_set_runner(i); -+ /* -+ * Check with the local_softirq_pending() bits, -+ * whether we need to process this still or if someone -+ * else took care of it. -+ */ -+ pending = local_softirq_pending(); -+ if (pending & mask) { -+ set_softirq_pending(pending & ~mask); -+ do_single_softirq(i); -+ } -+ softirq_clr_runner(i); -+ WARN_ON(current->softirq_nestcnt != 1); -+ local_irq_enable(); -+ unlock_softirq(i); -+ local_irq_disable(); -+ } -+} -+ -+void __local_bh_disable(void) -+{ -+ if (++current->softirq_nestcnt == 1) -+ migrate_disable(); -+} -+EXPORT_SYMBOL(__local_bh_disable); -+ -+void __local_bh_enable(void) -+{ -+ if (WARN_ON(current->softirq_nestcnt == 0)) -+ return; -+ -+ local_irq_disable(); -+ if (current->softirq_nestcnt == 1 && current->softirqs_raised) -+ do_current_softirqs(); -+ local_irq_enable(); -+ -+ if (--current->softirq_nestcnt == 0) -+ migrate_enable(); -+} -+EXPORT_SYMBOL(__local_bh_enable); -+ -+void _local_bh_enable(void) -+{ -+ if (WARN_ON(current->softirq_nestcnt == 0)) -+ return; -+ if (--current->softirq_nestcnt == 0) -+ migrate_enable(); -+} -+EXPORT_SYMBOL(_local_bh_enable); -+ -+int in_serving_softirq(void) -+{ -+ return current->flags & PF_IN_SOFTIRQ; -+} -+EXPORT_SYMBOL(in_serving_softirq); -+ -+/* Called with preemption disabled */ -+static void run_ksoftirqd(unsigned int cpu) -+{ -+ local_irq_disable(); -+ current->softirq_nestcnt++; -+ -+ do_current_softirqs(); -+ current->softirq_nestcnt--; -+ local_irq_enable(); -+ cond_resched_rcu_qs(); -+} -+ -+/* -+ * Called from netif_rx_ni(). Preemption enabled, but migration -+ * disabled. So the cpu can't go away under us. -+ */ -+void thread_do_softirq(void) -+{ -+ if (!in_serving_softirq() && current->softirqs_raised) { -+ current->softirq_nestcnt++; -+ do_current_softirqs(); -+ current->softirq_nestcnt--; -+ } -+} -+ -+static void do_raise_softirq_irqoff(unsigned int nr) -+{ -+ unsigned int mask; -+ -+ mask = 1UL << nr; -+ -+ trace_softirq_raise(nr); -+ or_softirq_pending(mask); -+ -+ /* -+ * If we are not in a hard interrupt and inside a bh disabled -+ * region, we simply raise the flag on current. local_bh_enable() -+ * will make sure that the softirq is executed. Otherwise we -+ * delegate it to ksoftirqd. -+ */ -+ if (!in_irq() && current->softirq_nestcnt) -+ current->softirqs_raised |= mask; -+ else if (!__this_cpu_read(ksoftirqd) || !__this_cpu_read(ktimer_softirqd)) -+ return; -+ -+ if (mask & TIMER_SOFTIRQS) -+ __this_cpu_read(ktimer_softirqd)->softirqs_raised |= mask; -+ else -+ __this_cpu_read(ksoftirqd)->softirqs_raised |= mask; -+} -+ -+static void wakeup_proper_softirq(unsigned int nr) -+{ -+ if ((1UL << nr) & TIMER_SOFTIRQS) -+ wakeup_timer_softirqd(); -+ else -+ wakeup_softirqd(); -+} -+ -+ -+void __raise_softirq_irqoff(unsigned int nr) -+{ -+ do_raise_softirq_irqoff(nr); -+ if (!in_irq() && !current->softirq_nestcnt) -+ wakeup_proper_softirq(nr); -+} -+ -+/* -+ * Same as __raise_softirq_irqoff() but will process them in ksoftirqd -+ */ -+void __raise_softirq_irqoff_ksoft(unsigned int nr) -+{ -+ unsigned int mask; -+ -+ if (WARN_ON_ONCE(!__this_cpu_read(ksoftirqd) || -+ !__this_cpu_read(ktimer_softirqd))) -+ return; -+ mask = 1UL << nr; -+ -+ trace_softirq_raise(nr); -+ or_softirq_pending(mask); -+ if (mask & TIMER_SOFTIRQS) -+ __this_cpu_read(ktimer_softirqd)->softirqs_raised |= mask; -+ else -+ __this_cpu_read(ksoftirqd)->softirqs_raised |= mask; -+ wakeup_proper_softirq(nr); -+} -+ -+/* -+ * This function must run with irqs disabled! -+ */ -+void raise_softirq_irqoff(unsigned int nr) -+{ -+ do_raise_softirq_irqoff(nr); -+ -+ /* -+ * If we're in an hard interrupt we let irq return code deal -+ * with the wakeup of ksoftirqd. -+ */ -+ if (in_irq()) -+ return; -+ /* -+ * If we are in thread context but outside of a bh disabled -+ * region, we need to wake ksoftirqd as well. -+ * -+ * CHECKME: Some of the places which do that could be wrapped -+ * into local_bh_disable/enable pairs. Though it's unclear -+ * whether this is worth the effort. To find those places just -+ * raise a WARN() if the condition is met. -+ */ -+ if (!current->softirq_nestcnt) -+ wakeup_proper_softirq(nr); -+} -+ -+static inline int ksoftirqd_softirq_pending(void) -+{ -+ return current->softirqs_raised; -+} -+ -+static inline void local_bh_disable_nort(void) { } -+static inline void _local_bh_enable_nort(void) { } -+ -+static inline void ksoftirqd_set_sched_params(unsigned int cpu) -+{ -+ /* Take over all but timer pending softirqs when starting */ -+ local_irq_disable(); -+ current->softirqs_raised = local_softirq_pending() & ~TIMER_SOFTIRQS; -+ local_irq_enable(); -+} -+ -+static inline void ktimer_softirqd_set_sched_params(unsigned int cpu) -+{ -+ struct sched_param param = { .sched_priority = 1 }; -+ -+ sched_setscheduler(current, SCHED_FIFO, ¶m); -+ -+ /* Take over timer pending softirqs when starting */ -+ local_irq_disable(); -+ current->softirqs_raised = local_softirq_pending() & TIMER_SOFTIRQS; -+ local_irq_enable(); -+} -+ -+static inline void ktimer_softirqd_clr_sched_params(unsigned int cpu, -+ bool online) -+{ -+ struct sched_param param = { .sched_priority = 0 }; -+ -+ sched_setscheduler(current, SCHED_NORMAL, ¶m); -+} -+ -+static int ktimer_softirqd_should_run(unsigned int cpu) -+{ -+ return current->softirqs_raised; -+} -+ -+#endif /* PREEMPT_RT_FULL */ -+/* - * Enter an interrupt context. - */ - void irq_enter(void) -@@ -330,9 +774,9 @@ void irq_enter(void) - * Prevent raise_softirq from needlessly waking up ksoftirqd - * here, as softirq will be serviced on return from interrupt. - */ -- local_bh_disable(); -+ local_bh_disable_nort(); - tick_irq_enter(); -- _local_bh_enable(); -+ _local_bh_enable_nort(); - } - - __irq_enter(); -@@ -340,6 +784,7 @@ void irq_enter(void) - - static inline void invoke_softirq(void) - { -+#ifndef CONFIG_PREEMPT_RT_FULL - if (!force_irqthreads) { - #ifdef CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK - /* -@@ -359,6 +804,18 @@ static inline void invoke_softirq(void) - } else { - wakeup_softirqd(); - } -+#else /* PREEMPT_RT_FULL */ -+ unsigned long flags; -+ -+ local_irq_save(flags); -+ if (__this_cpu_read(ksoftirqd) && -+ __this_cpu_read(ksoftirqd)->softirqs_raised) -+ wakeup_softirqd(); -+ if (__this_cpu_read(ktimer_softirqd) && -+ __this_cpu_read(ktimer_softirqd)->softirqs_raised) -+ wakeup_timer_softirqd(); -+ local_irq_restore(flags); -+#endif - } - - static inline void tick_irq_exit(void) -@@ -395,26 +852,6 @@ void irq_exit(void) - trace_hardirq_exit(); /* must be last! */ - } - --/* -- * This function must run with irqs disabled! -- */ --inline void raise_softirq_irqoff(unsigned int nr) --{ -- __raise_softirq_irqoff(nr); -- -- /* -- * If we're in an interrupt or softirq, we're done -- * (this also catches softirq-disabled code). We will -- * actually run the softirq once we return from -- * the irq or softirq. -- * -- * Otherwise we wake up ksoftirqd to make sure we -- * schedule the softirq soon. -- */ -- if (!in_interrupt()) -- wakeup_softirqd(); --} -- - void raise_softirq(unsigned int nr) - { - unsigned long flags; -@@ -424,12 +861,6 @@ void raise_softirq(unsigned int nr) - local_irq_restore(flags); - } - --void __raise_softirq_irqoff(unsigned int nr) --{ -- trace_softirq_raise(nr); -- or_softirq_pending(1UL << nr); --} -- - void open_softirq(int nr, void (*action)(struct softirq_action *)) - { - softirq_vec[nr].action = action; -@@ -446,15 +877,45 @@ struct tasklet_head { - static DEFINE_PER_CPU(struct tasklet_head, tasklet_vec); - static DEFINE_PER_CPU(struct tasklet_head, tasklet_hi_vec); - -+static void inline -+__tasklet_common_schedule(struct tasklet_struct *t, struct tasklet_head *head, unsigned int nr) -+{ -+ if (tasklet_trylock(t)) { -+again: -+ /* We may have been preempted before tasklet_trylock -+ * and __tasklet_action may have already run. -+ * So double check the sched bit while the takslet -+ * is locked before adding it to the list. -+ */ -+ if (test_bit(TASKLET_STATE_SCHED, &t->state)) { -+ t->next = NULL; -+ *head->tail = t; -+ head->tail = &(t->next); -+ raise_softirq_irqoff(nr); -+ tasklet_unlock(t); -+ } else { -+ /* This is subtle. If we hit the corner case above -+ * It is possible that we get preempted right here, -+ * and another task has successfully called -+ * tasklet_schedule(), then this function, and -+ * failed on the trylock. Thus we must be sure -+ * before releasing the tasklet lock, that the -+ * SCHED_BIT is clear. Otherwise the tasklet -+ * may get its SCHED_BIT set, but not added to the -+ * list -+ */ -+ if (!tasklet_tryunlock(t)) -+ goto again; -+ } -+ } -+} -+ - void __tasklet_schedule(struct tasklet_struct *t) - { - unsigned long flags; - - local_irq_save(flags); -- t->next = NULL; -- *__this_cpu_read(tasklet_vec.tail) = t; -- __this_cpu_write(tasklet_vec.tail, &(t->next)); -- raise_softirq_irqoff(TASKLET_SOFTIRQ); -+ __tasklet_common_schedule(t, this_cpu_ptr(&tasklet_vec), TASKLET_SOFTIRQ); - local_irq_restore(flags); - } - EXPORT_SYMBOL(__tasklet_schedule); -@@ -464,10 +925,7 @@ void __tasklet_hi_schedule(struct tasklet_struct *t) - unsigned long flags; - - local_irq_save(flags); -- t->next = NULL; -- *__this_cpu_read(tasklet_hi_vec.tail) = t; -- __this_cpu_write(tasklet_hi_vec.tail, &(t->next)); -- raise_softirq_irqoff(HI_SOFTIRQ); -+ __tasklet_common_schedule(t, this_cpu_ptr(&tasklet_hi_vec), HI_SOFTIRQ); - local_irq_restore(flags); - } - EXPORT_SYMBOL(__tasklet_hi_schedule); -@@ -476,82 +934,122 @@ void __tasklet_hi_schedule_first(struct tasklet_struct *t) - { - BUG_ON(!irqs_disabled()); - -- t->next = __this_cpu_read(tasklet_hi_vec.head); -- __this_cpu_write(tasklet_hi_vec.head, t); -- __raise_softirq_irqoff(HI_SOFTIRQ); -+ __tasklet_hi_schedule(t); - } - EXPORT_SYMBOL(__tasklet_hi_schedule_first); - --static void tasklet_action(struct softirq_action *a) -+void tasklet_enable(struct tasklet_struct *t) - { -- struct tasklet_struct *list; -+ if (!atomic_dec_and_test(&t->count)) -+ return; -+ if (test_and_clear_bit(TASKLET_STATE_PENDING, &t->state)) -+ tasklet_schedule(t); -+} -+EXPORT_SYMBOL(tasklet_enable); - -- local_irq_disable(); -- list = __this_cpu_read(tasklet_vec.head); -- __this_cpu_write(tasklet_vec.head, NULL); -- __this_cpu_write(tasklet_vec.tail, this_cpu_ptr(&tasklet_vec.head)); -- local_irq_enable(); -+static void __tasklet_action(struct softirq_action *a, -+ struct tasklet_struct *list) -+{ -+ int loops = 1000000; - - while (list) { - struct tasklet_struct *t = list; - - list = list->next; - -- if (tasklet_trylock(t)) { -- if (!atomic_read(&t->count)) { -- if (!test_and_clear_bit(TASKLET_STATE_SCHED, -- &t->state)) -- BUG(); -- t->func(t->data); -- tasklet_unlock(t); -- continue; -- } -- tasklet_unlock(t); -+ /* -+ * Should always succeed - after a tasklist got on the -+ * list (after getting the SCHED bit set from 0 to 1), -+ * nothing but the tasklet softirq it got queued to can -+ * lock it: -+ */ -+ if (!tasklet_trylock(t)) { -+ WARN_ON(1); -+ continue; - } - -- local_irq_disable(); - t->next = NULL; -- *__this_cpu_read(tasklet_vec.tail) = t; -- __this_cpu_write(tasklet_vec.tail, &(t->next)); -- __raise_softirq_irqoff(TASKLET_SOFTIRQ); -- local_irq_enable(); -+ -+ /* -+ * If we cannot handle the tasklet because it's disabled, -+ * mark it as pending. tasklet_enable() will later -+ * re-schedule the tasklet. -+ */ -+ if (unlikely(atomic_read(&t->count))) { -+out_disabled: -+ /* implicit unlock: */ -+ wmb(); -+ t->state = TASKLET_STATEF_PENDING; -+ continue; -+ } -+ -+ /* -+ * After this point on the tasklet might be rescheduled -+ * on another CPU, but it can only be added to another -+ * CPU's tasklet list if we unlock the tasklet (which we -+ * dont do yet). -+ */ -+ if (!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state)) -+ WARN_ON(1); -+ -+again: -+ t->func(t->data); -+ -+ /* -+ * Try to unlock the tasklet. We must use cmpxchg, because -+ * another CPU might have scheduled or disabled the tasklet. -+ * We only allow the STATE_RUN -> 0 transition here. -+ */ -+ while (!tasklet_tryunlock(t)) { -+ /* -+ * If it got disabled meanwhile, bail out: -+ */ -+ if (atomic_read(&t->count)) -+ goto out_disabled; -+ /* -+ * If it got scheduled meanwhile, re-execute -+ * the tasklet function: -+ */ -+ if (test_and_clear_bit(TASKLET_STATE_SCHED, &t->state)) -+ goto again; -+ if (!--loops) { -+ printk("hm, tasklet state: %08lx\n", t->state); -+ WARN_ON(1); -+ tasklet_unlock(t); -+ break; -+ } -+ } - } - } - -+static void tasklet_action(struct softirq_action *a) -+{ -+ struct tasklet_struct *list; -+ -+ local_irq_disable(); -+ -+ list = __this_cpu_read(tasklet_vec.head); -+ __this_cpu_write(tasklet_vec.head, NULL); -+ __this_cpu_write(tasklet_vec.tail, this_cpu_ptr(&tasklet_vec.head)); -+ -+ local_irq_enable(); -+ -+ __tasklet_action(a, list); -+} -+ - static void tasklet_hi_action(struct softirq_action *a) - { - struct tasklet_struct *list; - - local_irq_disable(); -+ - list = __this_cpu_read(tasklet_hi_vec.head); - __this_cpu_write(tasklet_hi_vec.head, NULL); - __this_cpu_write(tasklet_hi_vec.tail, this_cpu_ptr(&tasklet_hi_vec.head)); -+ - local_irq_enable(); - -- while (list) { -- struct tasklet_struct *t = list; -- -- list = list->next; -- -- if (tasklet_trylock(t)) { -- if (!atomic_read(&t->count)) { -- if (!test_and_clear_bit(TASKLET_STATE_SCHED, -- &t->state)) -- BUG(); -- t->func(t->data); -- tasklet_unlock(t); -- continue; -- } -- tasklet_unlock(t); -- } -- -- local_irq_disable(); -- t->next = NULL; -- *__this_cpu_read(tasklet_hi_vec.tail) = t; -- __this_cpu_write(tasklet_hi_vec.tail, &(t->next)); -- __raise_softirq_irqoff(HI_SOFTIRQ); -- local_irq_enable(); -- } -+ __tasklet_action(a, list); - } - - void tasklet_init(struct tasklet_struct *t, -@@ -572,7 +1070,7 @@ void tasklet_kill(struct tasklet_struct *t) - - while (test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) { - do { -- yield(); -+ msleep(1); - } while (test_bit(TASKLET_STATE_SCHED, &t->state)); - } - tasklet_unlock_wait(t); -@@ -646,25 +1144,26 @@ void __init softirq_init(void) - open_softirq(HI_SOFTIRQ, tasklet_hi_action); - } - -+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL) -+void tasklet_unlock_wait(struct tasklet_struct *t) -+{ -+ while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { -+ /* -+ * Hack for now to avoid this busy-loop: -+ */ -+#ifdef CONFIG_PREEMPT_RT_FULL -+ msleep(1); -+#else -+ barrier(); -+#endif -+ } -+} -+EXPORT_SYMBOL(tasklet_unlock_wait); -+#endif -+ - static int ksoftirqd_should_run(unsigned int cpu) - { -- return local_softirq_pending(); --} -- --static void run_ksoftirqd(unsigned int cpu) --{ -- local_irq_disable(); -- if (local_softirq_pending()) { -- /* -- * We can safely run softirq on inline stack, as we are not deep -- * in the task stack here. -- */ -- __do_softirq(); -- local_irq_enable(); -- cond_resched_rcu_qs(); -- return; -- } -- local_irq_enable(); -+ return ksoftirqd_softirq_pending(); - } - - #ifdef CONFIG_HOTPLUG_CPU -@@ -746,16 +1245,31 @@ static struct notifier_block cpu_nfb = { - - static struct smp_hotplug_thread softirq_threads = { - .store = &ksoftirqd, -+ .setup = ksoftirqd_set_sched_params, - .thread_should_run = ksoftirqd_should_run, - .thread_fn = run_ksoftirqd, - .thread_comm = "ksoftirqd/%u", - }; - -+#ifdef CONFIG_PREEMPT_RT_FULL -+static struct smp_hotplug_thread softirq_timer_threads = { -+ .store = &ktimer_softirqd, -+ .setup = ktimer_softirqd_set_sched_params, -+ .cleanup = ktimer_softirqd_clr_sched_params, -+ .thread_should_run = ktimer_softirqd_should_run, -+ .thread_fn = run_ksoftirqd, -+ .thread_comm = "ktimersoftd/%u", -+}; -+#endif -+ - static __init int spawn_ksoftirqd(void) - { - register_cpu_notifier(&cpu_nfb); - - BUG_ON(smpboot_register_percpu_thread(&softirq_threads)); -+#ifdef CONFIG_PREEMPT_RT_FULL -+ BUG_ON(smpboot_register_percpu_thread(&softirq_timer_threads)); -+#endif - - return 0; - } -diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c -index a467e6c28a3b..d01a5118d58a 100644 ---- a/kernel/stop_machine.c -+++ b/kernel/stop_machine.c -@@ -36,7 +36,7 @@ struct cpu_stop_done { - struct cpu_stopper { - struct task_struct *thread; - -- spinlock_t lock; -+ raw_spinlock_t lock; - bool enabled; /* is this stopper enabled? */ - struct list_head works; /* list of pending works */ - -@@ -82,14 +82,14 @@ static bool cpu_stop_queue_work(unsigned int cpu, struct cpu_stop_work *work) - unsigned long flags; - bool enabled; - -- spin_lock_irqsave(&stopper->lock, flags); -+ raw_spin_lock_irqsave(&stopper->lock, flags); - enabled = stopper->enabled; - if (enabled) - __cpu_stop_queue_work(stopper, work); - else if (work->done) - cpu_stop_signal_done(work->done); -- spin_unlock_irqrestore(&stopper->lock, flags); - -+ raw_spin_unlock_irqrestore(&stopper->lock, flags); - return enabled; - } - -@@ -224,8 +224,8 @@ static int cpu_stop_queue_two_works(int cpu1, struct cpu_stop_work *work1, - int err; - - lg_double_lock(&stop_cpus_lock, cpu1, cpu2); -- spin_lock_irq(&stopper1->lock); -- spin_lock_nested(&stopper2->lock, SINGLE_DEPTH_NESTING); -+ raw_spin_lock_irq(&stopper1->lock); -+ raw_spin_lock_nested(&stopper2->lock, SINGLE_DEPTH_NESTING); - - err = -ENOENT; - if (!stopper1->enabled || !stopper2->enabled) -@@ -235,8 +235,8 @@ static int cpu_stop_queue_two_works(int cpu1, struct cpu_stop_work *work1, - __cpu_stop_queue_work(stopper1, work1); - __cpu_stop_queue_work(stopper2, work2); - unlock: -- spin_unlock(&stopper2->lock); -- spin_unlock_irq(&stopper1->lock); -+ raw_spin_unlock(&stopper2->lock); -+ raw_spin_unlock_irq(&stopper1->lock); - lg_double_unlock(&stop_cpus_lock, cpu1, cpu2); - - return err; -@@ -313,18 +313,21 @@ static DEFINE_MUTEX(stop_cpus_mutex); - - static bool queue_stop_cpus_work(const struct cpumask *cpumask, - cpu_stop_fn_t fn, void *arg, -- struct cpu_stop_done *done) -+ struct cpu_stop_done *done, bool inactive) - { - struct cpu_stop_work *work; - unsigned int cpu; - bool queued = false; - - /* -- * Disable preemption while queueing to avoid getting -- * preempted by a stopper which might wait for other stoppers -- * to enter @fn which can lead to deadlock. -+ * Make sure that all work is queued on all cpus before -+ * any of the cpus can execute it. - */ -- lg_global_lock(&stop_cpus_lock); -+ if (!inactive) -+ lg_global_lock(&stop_cpus_lock); -+ else -+ lg_global_trylock_relax(&stop_cpus_lock); -+ - for_each_cpu(cpu, cpumask) { - work = &per_cpu(cpu_stopper.stop_work, cpu); - work->fn = fn; -@@ -344,7 +347,7 @@ static int __stop_cpus(const struct cpumask *cpumask, - struct cpu_stop_done done; - - cpu_stop_init_done(&done, cpumask_weight(cpumask)); -- if (!queue_stop_cpus_work(cpumask, fn, arg, &done)) -+ if (!queue_stop_cpus_work(cpumask, fn, arg, &done, false)) - return -ENOENT; - wait_for_completion(&done.completion); - return done.ret; -@@ -425,9 +428,9 @@ static int cpu_stop_should_run(unsigned int cpu) - unsigned long flags; - int run; - -- spin_lock_irqsave(&stopper->lock, flags); -+ raw_spin_lock_irqsave(&stopper->lock, flags); - run = !list_empty(&stopper->works); -- spin_unlock_irqrestore(&stopper->lock, flags); -+ raw_spin_unlock_irqrestore(&stopper->lock, flags); - return run; - } - -@@ -438,13 +441,13 @@ static void cpu_stopper_thread(unsigned int cpu) - - repeat: - work = NULL; -- spin_lock_irq(&stopper->lock); -+ raw_spin_lock_irq(&stopper->lock); - if (!list_empty(&stopper->works)) { - work = list_first_entry(&stopper->works, - struct cpu_stop_work, list); - list_del_init(&work->list); - } -- spin_unlock_irq(&stopper->lock); -+ raw_spin_unlock_irq(&stopper->lock); - - if (work) { - cpu_stop_fn_t fn = work->fn; -@@ -452,6 +455,16 @@ static void cpu_stopper_thread(unsigned int cpu) - struct cpu_stop_done *done = work->done; - int ret; - -+ /* -+ * Wait until the stopper finished scheduling on all -+ * cpus -+ */ -+ lg_global_lock(&stop_cpus_lock); -+ /* -+ * Let other cpu threads continue as well -+ */ -+ lg_global_unlock(&stop_cpus_lock); -+ - /* cpu stop callbacks must not sleep, make in_atomic() == T */ - preempt_count_inc(); - ret = fn(arg); -@@ -518,10 +531,12 @@ static int __init cpu_stop_init(void) - for_each_possible_cpu(cpu) { - struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu); - -- spin_lock_init(&stopper->lock); -+ raw_spin_lock_init(&stopper->lock); - INIT_LIST_HEAD(&stopper->works); - } - -+ lg_lock_init(&stop_cpus_lock, "stop_cpus_lock"); -+ - BUG_ON(smpboot_register_percpu_thread(&cpu_stop_threads)); - stop_machine_unpark(raw_smp_processor_id()); - stop_machine_initialized = true; -@@ -616,7 +631,7 @@ int stop_machine_from_inactive_cpu(cpu_stop_fn_t fn, void *data, - set_state(&msdata, MULTI_STOP_PREPARE); - cpu_stop_init_done(&done, num_active_cpus()); - queue_stop_cpus_work(cpu_active_mask, multi_cpu_stop, &msdata, -- &done); -+ &done, true); - ret = multi_cpu_stop(&msdata); - - /* Busy wait for completion. */ -diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c -index fa0b983290cf..ab846abc8b7b 100644 ---- a/kernel/time/hrtimer.c -+++ b/kernel/time/hrtimer.c -@@ -48,11 +48,13 @@ - #include <linux/sched/rt.h> - #include <linux/sched/deadline.h> - #include <linux/timer.h> -+#include <linux/kthread.h> - #include <linux/freezer.h> - - #include <asm/uaccess.h> - - #include <trace/events/timer.h> -+#include <trace/events/hist.h> - - #include "tick-internal.h" - -@@ -706,6 +708,44 @@ static void clock_was_set_work(struct work_struct *work) - - static DECLARE_WORK(hrtimer_work, clock_was_set_work); - -+#ifdef CONFIG_PREEMPT_RT_FULL -+/* -+ * RT can not call schedule_work from real interrupt context. -+ * Need to make a thread to do the real work. -+ */ -+static struct task_struct *clock_set_delay_thread; -+static bool do_clock_set_delay; -+ -+static int run_clock_set_delay(void *ignore) -+{ -+ while (!kthread_should_stop()) { -+ set_current_state(TASK_INTERRUPTIBLE); -+ if (do_clock_set_delay) { -+ do_clock_set_delay = false; -+ schedule_work(&hrtimer_work); -+ } -+ schedule(); -+ } -+ __set_current_state(TASK_RUNNING); -+ return 0; -+} -+ -+void clock_was_set_delayed(void) -+{ -+ do_clock_set_delay = true; -+ /* Make visible before waking up process */ -+ smp_wmb(); -+ wake_up_process(clock_set_delay_thread); -+} -+ -+static __init int create_clock_set_delay_thread(void) -+{ -+ clock_set_delay_thread = kthread_run(run_clock_set_delay, NULL, "kclksetdelayd"); -+ BUG_ON(!clock_set_delay_thread); -+ return 0; -+} -+early_initcall(create_clock_set_delay_thread); -+#else /* PREEMPT_RT_FULL */ - /* - * Called from timekeeping and resume code to reprogramm the hrtimer - * interrupt device on all cpus. -@@ -714,6 +754,7 @@ void clock_was_set_delayed(void) - { - schedule_work(&hrtimer_work); - } -+#endif - - #else - -@@ -723,11 +764,8 @@ static inline int hrtimer_is_hres_enabled(void) { return 0; } - static inline void hrtimer_switch_to_hres(void) { } - static inline void - hrtimer_force_reprogram(struct hrtimer_cpu_base *base, int skip_equal) { } --static inline int hrtimer_reprogram(struct hrtimer *timer, -- struct hrtimer_clock_base *base) --{ -- return 0; --} -+static inline void hrtimer_reprogram(struct hrtimer *timer, -+ struct hrtimer_clock_base *base) { } - static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) { } - static inline void retrigger_next_event(void *arg) { } - -@@ -859,6 +897,32 @@ u64 hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval) - } - EXPORT_SYMBOL_GPL(hrtimer_forward); - -+#ifdef CONFIG_PREEMPT_RT_BASE -+# define wake_up_timer_waiters(b) wake_up(&(b)->wait) -+ -+/** -+ * hrtimer_wait_for_timer - Wait for a running timer -+ * -+ * @timer: timer to wait for -+ * -+ * The function waits in case the timers callback function is -+ * currently executed on the waitqueue of the timer base. The -+ * waitqueue is woken up after the timer callback function has -+ * finished execution. -+ */ -+void hrtimer_wait_for_timer(const struct hrtimer *timer) -+{ -+ struct hrtimer_clock_base *base = timer->base; -+ -+ if (base && base->cpu_base && !timer->irqsafe) -+ wait_event(base->cpu_base->wait, -+ !(hrtimer_callback_running(timer))); -+} -+ -+#else -+# define wake_up_timer_waiters(b) do { } while (0) -+#endif -+ - /* - * enqueue_hrtimer - internal function to (re)start a timer - * -@@ -900,6 +964,11 @@ static void __remove_hrtimer(struct hrtimer *timer, - if (!(state & HRTIMER_STATE_ENQUEUED)) - return; - -+ if (unlikely(!list_empty(&timer->cb_entry))) { -+ list_del_init(&timer->cb_entry); -+ return; -+ } -+ - if (!timerqueue_del(&base->active, &timer->node)) - cpu_base->active_bases &= ~(1 << base->index); - -@@ -995,7 +1064,16 @@ void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, - new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED); - - timer_stats_hrtimer_set_start_info(timer); -+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST -+ { -+ ktime_t now = new_base->get_time(); - -+ if (ktime_to_ns(tim) < ktime_to_ns(now)) -+ timer->praecox = now; -+ else -+ timer->praecox = ktime_set(0, 0); -+ } -+#endif - leftmost = enqueue_hrtimer(timer, new_base); - if (!leftmost) - goto unlock; -@@ -1067,7 +1145,7 @@ int hrtimer_cancel(struct hrtimer *timer) - - if (ret >= 0) - return ret; -- cpu_relax(); -+ hrtimer_wait_for_timer(timer); - } - } - EXPORT_SYMBOL_GPL(hrtimer_cancel); -@@ -1131,6 +1209,7 @@ static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id, - - base = hrtimer_clockid_to_base(clock_id); - timer->base = &cpu_base->clock_base[base]; -+ INIT_LIST_HEAD(&timer->cb_entry); - timerqueue_init(&timer->node); - - #ifdef CONFIG_TIMER_STATS -@@ -1171,6 +1250,7 @@ bool hrtimer_active(const struct hrtimer *timer) - seq = raw_read_seqcount_begin(&cpu_base->seq); - - if (timer->state != HRTIMER_STATE_INACTIVE || -+ cpu_base->running_soft == timer || - cpu_base->running == timer) - return true; - -@@ -1269,10 +1349,112 @@ static void __run_hrtimer(struct hrtimer_cpu_base *cpu_base, - cpu_base->running = NULL; - } - -+#ifdef CONFIG_PREEMPT_RT_BASE -+static void hrtimer_rt_reprogram(int restart, struct hrtimer *timer, -+ struct hrtimer_clock_base *base) -+{ -+ int leftmost; -+ -+ if (restart != HRTIMER_NORESTART && -+ !(timer->state & HRTIMER_STATE_ENQUEUED)) { -+ -+ leftmost = enqueue_hrtimer(timer, base); -+ if (!leftmost) -+ return; -+#ifdef CONFIG_HIGH_RES_TIMERS -+ if (!hrtimer_is_hres_active(timer)) { -+ /* -+ * Kick to reschedule the next tick to handle the new timer -+ * on dynticks target. -+ */ -+ if (base->cpu_base->nohz_active) -+ wake_up_nohz_cpu(base->cpu_base->cpu); -+ } else { -+ -+ hrtimer_reprogram(timer, base); -+ } -+#endif -+ } -+} -+ -+/* -+ * The changes in mainline which removed the callback modes from -+ * hrtimer are not yet working with -rt. The non wakeup_process() -+ * based callbacks which involve sleeping locks need to be treated -+ * seperately. -+ */ -+static void hrtimer_rt_run_pending(void) -+{ -+ enum hrtimer_restart (*fn)(struct hrtimer *); -+ struct hrtimer_cpu_base *cpu_base; -+ struct hrtimer_clock_base *base; -+ struct hrtimer *timer; -+ int index, restart; -+ -+ local_irq_disable(); -+ cpu_base = &per_cpu(hrtimer_bases, smp_processor_id()); -+ -+ raw_spin_lock(&cpu_base->lock); -+ -+ for (index = 0; index < HRTIMER_MAX_CLOCK_BASES; index++) { -+ base = &cpu_base->clock_base[index]; -+ -+ while (!list_empty(&base->expired)) { -+ timer = list_first_entry(&base->expired, -+ struct hrtimer, cb_entry); -+ -+ /* -+ * Same as the above __run_hrtimer function -+ * just we run with interrupts enabled. -+ */ -+ debug_deactivate(timer); -+ cpu_base->running_soft = timer; -+ raw_write_seqcount_barrier(&cpu_base->seq); -+ -+ __remove_hrtimer(timer, base, HRTIMER_STATE_INACTIVE, 0); -+ timer_stats_account_hrtimer(timer); -+ fn = timer->function; -+ -+ raw_spin_unlock_irq(&cpu_base->lock); -+ restart = fn(timer); -+ raw_spin_lock_irq(&cpu_base->lock); -+ -+ hrtimer_rt_reprogram(restart, timer, base); -+ raw_write_seqcount_barrier(&cpu_base->seq); -+ -+ WARN_ON_ONCE(cpu_base->running_soft != timer); -+ cpu_base->running_soft = NULL; -+ } -+ } -+ -+ raw_spin_unlock_irq(&cpu_base->lock); -+ -+ wake_up_timer_waiters(cpu_base); -+} -+ -+static int hrtimer_rt_defer(struct hrtimer *timer) -+{ -+ if (timer->irqsafe) -+ return 0; -+ -+ __remove_hrtimer(timer, timer->base, timer->state, 0); -+ list_add_tail(&timer->cb_entry, &timer->base->expired); -+ return 1; -+} -+ -+#else -+ -+static inline int hrtimer_rt_defer(struct hrtimer *timer) { return 0; } -+ -+#endif -+ -+static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer); -+ - static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now) - { - struct hrtimer_clock_base *base = cpu_base->clock_base; - unsigned int active = cpu_base->active_bases; -+ int raise = 0; - - for (; active; base++, active >>= 1) { - struct timerqueue_node *node; -@@ -1288,6 +1470,15 @@ static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now) - - timer = container_of(node, struct hrtimer, node); - -+ trace_hrtimer_interrupt(raw_smp_processor_id(), -+ ktime_to_ns(ktime_sub(ktime_to_ns(timer->praecox) ? -+ timer->praecox : hrtimer_get_expires(timer), -+ basenow)), -+ current, -+ timer->function == hrtimer_wakeup ? -+ container_of(timer, struct hrtimer_sleeper, -+ timer)->task : NULL); -+ - /* - * The immediate goal for using the softexpires is - * minimizing wakeups, not running timers at the -@@ -1303,9 +1494,14 @@ static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now) - if (basenow.tv64 < hrtimer_get_softexpires_tv64(timer)) - break; - -- __run_hrtimer(cpu_base, base, timer, &basenow); -+ if (!hrtimer_rt_defer(timer)) -+ __run_hrtimer(cpu_base, base, timer, &basenow); -+ else -+ raise = 1; - } - } -+ if (raise) -+ raise_softirq_irqoff(HRTIMER_SOFTIRQ); - } - - #ifdef CONFIG_HIGH_RES_TIMERS -@@ -1468,16 +1664,18 @@ static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer) - void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task) - { - sl->timer.function = hrtimer_wakeup; -+ sl->timer.irqsafe = 1; - sl->task = task; - } - EXPORT_SYMBOL_GPL(hrtimer_init_sleeper); - --static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode) -+static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode, -+ unsigned long state) - { - hrtimer_init_sleeper(t, current); - - do { -- set_current_state(TASK_INTERRUPTIBLE); -+ set_current_state(state); - hrtimer_start_expires(&t->timer, mode); - - if (likely(t->task)) -@@ -1519,7 +1717,8 @@ long __sched hrtimer_nanosleep_restart(struct restart_block *restart) - HRTIMER_MODE_ABS); - hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires); - -- if (do_nanosleep(&t, HRTIMER_MODE_ABS)) -+ /* cpu_chill() does not care about restart state. */ -+ if (do_nanosleep(&t, HRTIMER_MODE_ABS, TASK_INTERRUPTIBLE)) - goto out; - - rmtp = restart->nanosleep.rmtp; -@@ -1536,8 +1735,10 @@ long __sched hrtimer_nanosleep_restart(struct restart_block *restart) - return ret; - } - --long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp, -- const enum hrtimer_mode mode, const clockid_t clockid) -+static long -+__hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp, -+ const enum hrtimer_mode mode, const clockid_t clockid, -+ unsigned long state) - { - struct restart_block *restart; - struct hrtimer_sleeper t; -@@ -1550,7 +1751,7 @@ long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp, - - hrtimer_init_on_stack(&t.timer, clockid, mode); - hrtimer_set_expires_range_ns(&t.timer, timespec_to_ktime(*rqtp), slack); -- if (do_nanosleep(&t, mode)) -+ if (do_nanosleep(&t, mode, state)) - goto out; - - /* Absolute timers do not update the rmtp value and restart: */ -@@ -1577,6 +1778,12 @@ long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp, - return ret; - } - -+long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp, -+ const enum hrtimer_mode mode, const clockid_t clockid) -+{ -+ return __hrtimer_nanosleep(rqtp, rmtp, mode, clockid, TASK_INTERRUPTIBLE); -+} -+ - SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp, - struct timespec __user *, rmtp) - { -@@ -1591,6 +1798,26 @@ SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp, - return hrtimer_nanosleep(&tu, rmtp, HRTIMER_MODE_REL, CLOCK_MONOTONIC); - } - -+#ifdef CONFIG_PREEMPT_RT_FULL -+/* -+ * Sleep for 1 ms in hope whoever holds what we want will let it go. -+ */ -+void cpu_chill(void) -+{ -+ struct timespec tu = { -+ .tv_nsec = NSEC_PER_MSEC, -+ }; -+ unsigned int freeze_flag = current->flags & PF_NOFREEZE; -+ -+ current->flags |= PF_NOFREEZE; -+ __hrtimer_nanosleep(&tu, NULL, HRTIMER_MODE_REL, CLOCK_MONOTONIC, -+ TASK_UNINTERRUPTIBLE); -+ if (!freeze_flag) -+ current->flags &= ~PF_NOFREEZE; -+} -+EXPORT_SYMBOL(cpu_chill); -+#endif -+ - /* - * Functions related to boot-time initialization: - */ -@@ -1602,10 +1829,14 @@ static void init_hrtimers_cpu(int cpu) - for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) { - cpu_base->clock_base[i].cpu_base = cpu_base; - timerqueue_init_head(&cpu_base->clock_base[i].active); -+ INIT_LIST_HEAD(&cpu_base->clock_base[i].expired); - } - - cpu_base->cpu = cpu; - hrtimer_init_hres(cpu_base); -+#ifdef CONFIG_PREEMPT_RT_BASE -+ init_waitqueue_head(&cpu_base->wait); -+#endif - } - - #ifdef CONFIG_HOTPLUG_CPU -@@ -1703,11 +1934,21 @@ static struct notifier_block hrtimers_nb = { - .notifier_call = hrtimer_cpu_notify, - }; - -+#ifdef CONFIG_PREEMPT_RT_BASE -+static void run_hrtimer_softirq(struct softirq_action *h) -+{ -+ hrtimer_rt_run_pending(); -+} -+#endif -+ - void __init hrtimers_init(void) - { - hrtimer_cpu_notify(&hrtimers_nb, (unsigned long)CPU_UP_PREPARE, - (void *)(long)smp_processor_id()); - register_cpu_notifier(&hrtimers_nb); -+#ifdef CONFIG_PREEMPT_RT_BASE -+ open_softirq(HRTIMER_SOFTIRQ, run_hrtimer_softirq); -+#endif - } - - /** -diff --git a/kernel/time/itimer.c b/kernel/time/itimer.c -index 1d5c7204ddc9..184de6751180 100644 ---- a/kernel/time/itimer.c -+++ b/kernel/time/itimer.c -@@ -213,6 +213,7 @@ int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue) - /* We are sharing ->siglock with it_real_fn() */ - if (hrtimer_try_to_cancel(timer) < 0) { - spin_unlock_irq(&tsk->sighand->siglock); -+ hrtimer_wait_for_timer(&tsk->signal->real_timer); - goto again; - } - expires = timeval_to_ktime(value->it_value); -diff --git a/kernel/time/jiffies.c b/kernel/time/jiffies.c -index 555e21f7b966..a5d6435fabbb 100644 ---- a/kernel/time/jiffies.c -+++ b/kernel/time/jiffies.c -@@ -74,7 +74,8 @@ static struct clocksource clocksource_jiffies = { - .max_cycles = 10, - }; - --__cacheline_aligned_in_smp DEFINE_SEQLOCK(jiffies_lock); -+__cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(jiffies_lock); -+__cacheline_aligned_in_smp seqcount_t jiffies_seq; - - #if (BITS_PER_LONG < 64) - u64 get_jiffies_64(void) -@@ -83,9 +84,9 @@ u64 get_jiffies_64(void) - u64 ret; - - do { -- seq = read_seqbegin(&jiffies_lock); -+ seq = read_seqcount_begin(&jiffies_seq); - ret = jiffies_64; -- } while (read_seqretry(&jiffies_lock, seq)); -+ } while (read_seqcount_retry(&jiffies_seq, seq)); - return ret; - } - EXPORT_SYMBOL(get_jiffies_64); -diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c -index 6df8927c58a5..6b4c19fa233f 100644 ---- a/kernel/time/ntp.c -+++ b/kernel/time/ntp.c -@@ -10,6 +10,7 @@ - #include <linux/workqueue.h> - #include <linux/hrtimer.h> - #include <linux/jiffies.h> -+#include <linux/kthread.h> - #include <linux/math64.h> - #include <linux/timex.h> - #include <linux/time.h> -@@ -568,10 +569,52 @@ static void sync_cmos_clock(struct work_struct *work) - &sync_cmos_work, timespec64_to_jiffies(&next)); - } - -+#ifdef CONFIG_PREEMPT_RT_FULL -+/* -+ * RT can not call schedule_delayed_work from real interrupt context. -+ * Need to make a thread to do the real work. -+ */ -+static struct task_struct *cmos_delay_thread; -+static bool do_cmos_delay; -+ -+static int run_cmos_delay(void *ignore) -+{ -+ while (!kthread_should_stop()) { -+ set_current_state(TASK_INTERRUPTIBLE); -+ if (do_cmos_delay) { -+ do_cmos_delay = false; -+ queue_delayed_work(system_power_efficient_wq, -+ &sync_cmos_work, 0); -+ } -+ schedule(); -+ } -+ __set_current_state(TASK_RUNNING); -+ return 0; -+} -+ -+void ntp_notify_cmos_timer(void) -+{ -+ do_cmos_delay = true; -+ /* Make visible before waking up process */ -+ smp_wmb(); -+ wake_up_process(cmos_delay_thread); -+} -+ -+static __init int create_cmos_delay_thread(void) -+{ -+ cmos_delay_thread = kthread_run(run_cmos_delay, NULL, "kcmosdelayd"); -+ BUG_ON(!cmos_delay_thread); -+ return 0; -+} -+early_initcall(create_cmos_delay_thread); -+ -+#else -+ - void ntp_notify_cmos_timer(void) - { - queue_delayed_work(system_power_efficient_wq, &sync_cmos_work, 0); - } -+#endif /* CONFIG_PREEMPT_RT_FULL */ - - #else - void ntp_notify_cmos_timer(void) { } -diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c -index 1cafba860b08..5f16807aa3ff 100644 ---- a/kernel/time/posix-cpu-timers.c -+++ b/kernel/time/posix-cpu-timers.c -@@ -3,6 +3,7 @@ - */ - - #include <linux/sched.h> -+#include <linux/sched/rt.h> - #include <linux/posix-timers.h> - #include <linux/errno.h> - #include <linux/math64.h> -@@ -620,7 +621,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags, - /* - * Disarm any old timer after extracting its expiry time. - */ -- WARN_ON_ONCE(!irqs_disabled()); -+ WARN_ON_ONCE_NONRT(!irqs_disabled()); - - ret = 0; - old_incr = timer->it.cpu.incr; -@@ -1063,7 +1064,7 @@ void posix_cpu_timer_schedule(struct k_itimer *timer) - /* - * Now re-arm for the new expiry time. - */ -- WARN_ON_ONCE(!irqs_disabled()); -+ WARN_ON_ONCE_NONRT(!irqs_disabled()); - arm_timer(timer); - unlock_task_sighand(p, &flags); - -@@ -1152,13 +1153,13 @@ static inline int fastpath_timer_check(struct task_struct *tsk) - * already updated our counts. We need to check if any timers fire now. - * Interrupts are disabled. - */ --void run_posix_cpu_timers(struct task_struct *tsk) -+static void __run_posix_cpu_timers(struct task_struct *tsk) - { - LIST_HEAD(firing); - struct k_itimer *timer, *next; - unsigned long flags; - -- WARN_ON_ONCE(!irqs_disabled()); -+ WARN_ON_ONCE_NONRT(!irqs_disabled()); - - /* - * The fast path checks that there are no expired thread or thread -@@ -1212,6 +1213,190 @@ void run_posix_cpu_timers(struct task_struct *tsk) - } - } - -+#ifdef CONFIG_PREEMPT_RT_BASE -+#include <linux/kthread.h> -+#include <linux/cpu.h> -+DEFINE_PER_CPU(struct task_struct *, posix_timer_task); -+DEFINE_PER_CPU(struct task_struct *, posix_timer_tasklist); -+ -+static int posix_cpu_timers_thread(void *data) -+{ -+ int cpu = (long)data; -+ -+ BUG_ON(per_cpu(posix_timer_task,cpu) != current); -+ -+ while (!kthread_should_stop()) { -+ struct task_struct *tsk = NULL; -+ struct task_struct *next = NULL; -+ -+ if (cpu_is_offline(cpu)) -+ goto wait_to_die; -+ -+ /* grab task list */ -+ raw_local_irq_disable(); -+ tsk = per_cpu(posix_timer_tasklist, cpu); -+ per_cpu(posix_timer_tasklist, cpu) = NULL; -+ raw_local_irq_enable(); -+ -+ /* its possible the list is empty, just return */ -+ if (!tsk) { -+ set_current_state(TASK_INTERRUPTIBLE); -+ schedule(); -+ __set_current_state(TASK_RUNNING); -+ continue; -+ } -+ -+ /* Process task list */ -+ while (1) { -+ /* save next */ -+ next = tsk->posix_timer_list; -+ -+ /* run the task timers, clear its ptr and -+ * unreference it -+ */ -+ __run_posix_cpu_timers(tsk); -+ tsk->posix_timer_list = NULL; -+ put_task_struct(tsk); -+ -+ /* check if this is the last on the list */ -+ if (next == tsk) -+ break; -+ tsk = next; -+ } -+ } -+ return 0; -+ -+wait_to_die: -+ /* Wait for kthread_stop */ -+ set_current_state(TASK_INTERRUPTIBLE); -+ while (!kthread_should_stop()) { -+ schedule(); -+ set_current_state(TASK_INTERRUPTIBLE); -+ } -+ __set_current_state(TASK_RUNNING); -+ return 0; -+} -+ -+static inline int __fastpath_timer_check(struct task_struct *tsk) -+{ -+ /* tsk == current, ensure it is safe to use ->signal/sighand */ -+ if (unlikely(tsk->exit_state)) -+ return 0; -+ -+ if (!task_cputime_zero(&tsk->cputime_expires)) -+ return 1; -+ -+ if (!task_cputime_zero(&tsk->signal->cputime_expires)) -+ return 1; -+ -+ return 0; -+} -+ -+void run_posix_cpu_timers(struct task_struct *tsk) -+{ -+ unsigned long cpu = smp_processor_id(); -+ struct task_struct *tasklist; -+ -+ BUG_ON(!irqs_disabled()); -+ if(!per_cpu(posix_timer_task, cpu)) -+ return; -+ /* get per-cpu references */ -+ tasklist = per_cpu(posix_timer_tasklist, cpu); -+ -+ /* check to see if we're already queued */ -+ if (!tsk->posix_timer_list && __fastpath_timer_check(tsk)) { -+ get_task_struct(tsk); -+ if (tasklist) { -+ tsk->posix_timer_list = tasklist; -+ } else { -+ /* -+ * The list is terminated by a self-pointing -+ * task_struct -+ */ -+ tsk->posix_timer_list = tsk; -+ } -+ per_cpu(posix_timer_tasklist, cpu) = tsk; -+ -+ wake_up_process(per_cpu(posix_timer_task, cpu)); -+ } -+} -+ -+/* -+ * posix_cpu_thread_call - callback that gets triggered when a CPU is added. -+ * Here we can start up the necessary migration thread for the new CPU. -+ */ -+static int posix_cpu_thread_call(struct notifier_block *nfb, -+ unsigned long action, void *hcpu) -+{ -+ int cpu = (long)hcpu; -+ struct task_struct *p; -+ struct sched_param param; -+ -+ switch (action) { -+ case CPU_UP_PREPARE: -+ p = kthread_create(posix_cpu_timers_thread, hcpu, -+ "posixcputmr/%d",cpu); -+ if (IS_ERR(p)) -+ return NOTIFY_BAD; -+ p->flags |= PF_NOFREEZE; -+ kthread_bind(p, cpu); -+ /* Must be high prio to avoid getting starved */ -+ param.sched_priority = MAX_RT_PRIO-1; -+ sched_setscheduler(p, SCHED_FIFO, ¶m); -+ per_cpu(posix_timer_task,cpu) = p; -+ break; -+ case CPU_ONLINE: -+ /* Strictly unneccessary, as first user will wake it. */ -+ wake_up_process(per_cpu(posix_timer_task,cpu)); -+ break; -+#ifdef CONFIG_HOTPLUG_CPU -+ case CPU_UP_CANCELED: -+ /* Unbind it from offline cpu so it can run. Fall thru. */ -+ kthread_bind(per_cpu(posix_timer_task, cpu), -+ cpumask_any(cpu_online_mask)); -+ kthread_stop(per_cpu(posix_timer_task,cpu)); -+ per_cpu(posix_timer_task,cpu) = NULL; -+ break; -+ case CPU_DEAD: -+ kthread_stop(per_cpu(posix_timer_task,cpu)); -+ per_cpu(posix_timer_task,cpu) = NULL; -+ break; -+#endif -+ } -+ return NOTIFY_OK; -+} -+ -+/* Register at highest priority so that task migration (migrate_all_tasks) -+ * happens before everything else. -+ */ -+static struct notifier_block posix_cpu_thread_notifier = { -+ .notifier_call = posix_cpu_thread_call, -+ .priority = 10 -+}; -+ -+static int __init posix_cpu_thread_init(void) -+{ -+ void *hcpu = (void *)(long)smp_processor_id(); -+ /* Start one for boot CPU. */ -+ unsigned long cpu; -+ -+ /* init the per-cpu posix_timer_tasklets */ -+ for_each_possible_cpu(cpu) -+ per_cpu(posix_timer_tasklist, cpu) = NULL; -+ -+ posix_cpu_thread_call(&posix_cpu_thread_notifier, CPU_UP_PREPARE, hcpu); -+ posix_cpu_thread_call(&posix_cpu_thread_notifier, CPU_ONLINE, hcpu); -+ register_cpu_notifier(&posix_cpu_thread_notifier); -+ return 0; -+} -+early_initcall(posix_cpu_thread_init); -+#else /* CONFIG_PREEMPT_RT_BASE */ -+void run_posix_cpu_timers(struct task_struct *tsk) -+{ -+ __run_posix_cpu_timers(tsk); -+} -+#endif /* CONFIG_PREEMPT_RT_BASE */ -+ - /* - * Set one of the process-wide special case CPU timers or RLIMIT_CPU. - * The tsk->sighand->siglock must be held by the caller. -diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c -index f2826c35e918..464a98155a0e 100644 ---- a/kernel/time/posix-timers.c -+++ b/kernel/time/posix-timers.c -@@ -506,6 +506,7 @@ static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer) - static struct pid *good_sigevent(sigevent_t * event) - { - struct task_struct *rtn = current->group_leader; -+ int sig = event->sigev_signo; - - if ((event->sigev_notify & SIGEV_THREAD_ID ) && - (!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) || -@@ -514,7 +515,8 @@ static struct pid *good_sigevent(sigevent_t * event) - return NULL; - - if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) && -- ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX))) -+ (sig <= 0 || sig > SIGRTMAX || sig_kernel_only(sig) || -+ sig_kernel_coredump(sig))) - return NULL; - - return task_pid(rtn); -@@ -826,6 +828,20 @@ SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id) - return overrun; - } - -+/* -+ * Protected by RCU! -+ */ -+static void timer_wait_for_callback(struct k_clock *kc, struct k_itimer *timr) -+{ -+#ifdef CONFIG_PREEMPT_RT_FULL -+ if (kc->timer_set == common_timer_set) -+ hrtimer_wait_for_timer(&timr->it.real.timer); -+ else -+ /* FIXME: Whacky hack for posix-cpu-timers */ -+ schedule_timeout(1); -+#endif -+} -+ - /* Set a POSIX.1b interval timer. */ - /* timr->it_lock is taken. */ - static int -@@ -903,6 +919,7 @@ SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, - if (!timr) - return -EINVAL; - -+ rcu_read_lock(); - kc = clockid_to_kclock(timr->it_clock); - if (WARN_ON_ONCE(!kc || !kc->timer_set)) - error = -EINVAL; -@@ -911,9 +928,12 @@ SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, - - unlock_timer(timr, flag); - if (error == TIMER_RETRY) { -+ timer_wait_for_callback(kc, timr); - rtn = NULL; // We already got the old time... -+ rcu_read_unlock(); - goto retry; - } -+ rcu_read_unlock(); - - if (old_setting && !error && - copy_to_user(old_setting, &old_spec, sizeof (old_spec))) -@@ -951,10 +971,15 @@ SYSCALL_DEFINE1(timer_delete, timer_t, timer_id) - if (!timer) - return -EINVAL; - -+ rcu_read_lock(); - if (timer_delete_hook(timer) == TIMER_RETRY) { - unlock_timer(timer, flags); -+ timer_wait_for_callback(clockid_to_kclock(timer->it_clock), -+ timer); -+ rcu_read_unlock(); - goto retry_delete; - } -+ rcu_read_unlock(); - - spin_lock(¤t->sighand->siglock); - list_del(&timer->list); -@@ -980,8 +1005,18 @@ static void itimer_delete(struct k_itimer *timer) - retry_delete: - spin_lock_irqsave(&timer->it_lock, flags); - -- if (timer_delete_hook(timer) == TIMER_RETRY) { -+ /* On RT we can race with a deletion */ -+ if (!timer->it_signal) { - unlock_timer(timer, flags); -+ return; -+ } -+ -+ if (timer_delete_hook(timer) == TIMER_RETRY) { -+ rcu_read_lock(); -+ unlock_timer(timer, flags); -+ timer_wait_for_callback(clockid_to_kclock(timer->it_clock), -+ timer); -+ rcu_read_unlock(); - goto retry_delete; - } - list_del(&timer->list); -diff --git a/kernel/time/tick-broadcast-hrtimer.c b/kernel/time/tick-broadcast-hrtimer.c -index 53d7184da0be..1b4ac3361c3f 100644 ---- a/kernel/time/tick-broadcast-hrtimer.c -+++ b/kernel/time/tick-broadcast-hrtimer.c -@@ -106,5 +106,6 @@ void tick_setup_hrtimer_broadcast(void) - { - hrtimer_init(&bctimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); - bctimer.function = bc_handler; -+ bctimer.irqsafe = true; - clockevents_register_device(&ce_broadcast_hrtimer); - } -diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c -index 4fcd99e12aa0..5a47f2e98faf 100644 ---- a/kernel/time/tick-common.c -+++ b/kernel/time/tick-common.c -@@ -79,13 +79,15 @@ int tick_is_oneshot_available(void) - static void tick_periodic(int cpu) - { - if (tick_do_timer_cpu == cpu) { -- write_seqlock(&jiffies_lock); -+ raw_spin_lock(&jiffies_lock); -+ write_seqcount_begin(&jiffies_seq); - - /* Keep track of the next tick event */ - tick_next_period = ktime_add(tick_next_period, tick_period); - - do_timer(1); -- write_sequnlock(&jiffies_lock); -+ write_seqcount_end(&jiffies_seq); -+ raw_spin_unlock(&jiffies_lock); - update_wall_time(); - } - -@@ -157,9 +159,9 @@ void tick_setup_periodic(struct clock_event_device *dev, int broadcast) - ktime_t next; - - do { -- seq = read_seqbegin(&jiffies_lock); -+ seq = read_seqcount_begin(&jiffies_seq); - next = tick_next_period; -- } while (read_seqretry(&jiffies_lock, seq)); -+ } while (read_seqcount_retry(&jiffies_seq, seq)); - - clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT); - -diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h -index 966a5a6fdd0a..f738251000fe 100644 ---- a/kernel/time/tick-internal.h -+++ b/kernel/time/tick-internal.h -@@ -164,3 +164,4 @@ static inline void timers_update_migration(bool update_nohz) { } - DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases); - - extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem); -+void timer_clear_idle(void); -diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c -index 58e3310c9b21..6fc9a5fdd5f4 100644 ---- a/kernel/time/tick-sched.c -+++ b/kernel/time/tick-sched.c -@@ -62,7 +62,8 @@ static void tick_do_update_jiffies64(ktime_t now) - return; - - /* Reevalute with jiffies_lock held */ -- write_seqlock(&jiffies_lock); -+ raw_spin_lock(&jiffies_lock); -+ write_seqcount_begin(&jiffies_seq); - - delta = ktime_sub(now, last_jiffies_update); - if (delta.tv64 >= tick_period.tv64) { -@@ -85,10 +86,12 @@ static void tick_do_update_jiffies64(ktime_t now) - /* Keep the tick_next_period variable up to date */ - tick_next_period = ktime_add(last_jiffies_update, tick_period); - } else { -- write_sequnlock(&jiffies_lock); -+ write_seqcount_end(&jiffies_seq); -+ raw_spin_unlock(&jiffies_lock); - return; - } -- write_sequnlock(&jiffies_lock); -+ write_seqcount_end(&jiffies_seq); -+ raw_spin_unlock(&jiffies_lock); - update_wall_time(); - } - -@@ -99,12 +102,14 @@ static ktime_t tick_init_jiffy_update(void) - { - ktime_t period; - -- write_seqlock(&jiffies_lock); -+ raw_spin_lock(&jiffies_lock); -+ write_seqcount_begin(&jiffies_seq); - /* Did we start the jiffies update yet ? */ - if (last_jiffies_update.tv64 == 0) - last_jiffies_update = tick_next_period; - period = last_jiffies_update; -- write_sequnlock(&jiffies_lock); -+ write_seqcount_end(&jiffies_seq); -+ raw_spin_unlock(&jiffies_lock); - return period; - } - -@@ -212,6 +217,7 @@ static void nohz_full_kick_func(struct irq_work *work) - - static DEFINE_PER_CPU(struct irq_work, nohz_full_kick_work) = { - .func = nohz_full_kick_func, -+ .flags = IRQ_WORK_HARD_IRQ, - }; - - /* -@@ -670,10 +676,10 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts, - - /* Read jiffies and the time when jiffies were updated last */ - do { -- seq = read_seqbegin(&jiffies_lock); -+ seq = read_seqcount_begin(&jiffies_seq); - basemono = last_jiffies_update.tv64; - basejiff = jiffies; -- } while (read_seqretry(&jiffies_lock, seq)); -+ } while (read_seqcount_retry(&jiffies_seq, seq)); - ts->last_jiffies = basejiff; - - if (rcu_needs_cpu(basemono, &next_rcu) || -@@ -700,6 +706,12 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts, - delta = next_tick - basemono; - if (delta <= (u64)TICK_NSEC) { - tick.tv64 = 0; -+ -+ /* -+ * Tell the timer code that the base is not idle, i.e. undo -+ * the effect of get_next_timer_interrupt(). -+ */ -+ timer_clear_idle(); - /* - * We've not stopped the tick yet, and there's a timer in the - * next period, so no point in stopping it either, bail. -@@ -808,6 +820,12 @@ static void tick_nohz_restart_sched_tick(struct tick_sched *ts, ktime_t now, int - tick_do_update_jiffies64(now); - update_cpu_load_nohz(active); - -+ /* -+ * Clear the timer idle flag, so we avoid IPIs on remote queueing and -+ * the clock forward checks in the enqueue path. -+ */ -+ timer_clear_idle(); -+ - calc_load_exit_idle(); - touch_softlockup_watchdog_sched(); - /* -@@ -861,14 +879,7 @@ static bool can_stop_idle_tick(int cpu, struct tick_sched *ts) - return false; - - if (unlikely(local_softirq_pending() && cpu_online(cpu))) { -- static int ratelimit; -- -- if (ratelimit < 10 && -- (local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK)) { -- pr_warn("NOHZ: local_softirq_pending %02x\n", -- (unsigned int) local_softirq_pending()); -- ratelimit++; -- } -+ softirq_check_pending_idle(); - return false; - } - -@@ -1091,35 +1102,6 @@ static void tick_nohz_switch_to_nohz(void) - tick_nohz_activate(ts, NOHZ_MODE_LOWRES); - } - --/* -- * When NOHZ is enabled and the tick is stopped, we need to kick the -- * tick timer from irq_enter() so that the jiffies update is kept -- * alive during long running softirqs. That's ugly as hell, but -- * correctness is key even if we need to fix the offending softirq in -- * the first place. -- * -- * Note, this is different to tick_nohz_restart. We just kick the -- * timer and do not touch the other magic bits which need to be done -- * when idle is left. -- */ --static void tick_nohz_kick_tick(struct tick_sched *ts, ktime_t now) --{ --#if 0 -- /* Switch back to 2.6.27 behaviour */ -- ktime_t delta; -- -- /* -- * Do not touch the tick device, when the next expiry is either -- * already reached or less/equal than the tick period. -- */ -- delta = ktime_sub(hrtimer_get_expires(&ts->sched_timer), now); -- if (delta.tv64 <= tick_period.tv64) -- return; -- -- tick_nohz_restart(ts, now); --#endif --} -- - static inline void tick_nohz_irq_enter(void) - { - struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched); -@@ -1130,10 +1112,8 @@ static inline void tick_nohz_irq_enter(void) - now = ktime_get(); - if (ts->idle_active) - tick_nohz_stop_idle(ts, now); -- if (ts->tick_stopped) { -+ if (ts->tick_stopped) - tick_nohz_update_jiffies(now); -- tick_nohz_kick_tick(ts, now); -- } - } - - #else -@@ -1208,6 +1188,7 @@ void tick_setup_sched_timer(void) - * Emulate tick processing via per-CPU hrtimers: - */ - hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); -+ ts->sched_timer.irqsafe = 1; - ts->sched_timer.function = tick_sched_timer; - - /* Get the next period (per cpu) */ -diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c -index 479d25cd3d4f..410c04b386e4 100644 ---- a/kernel/time/timekeeping.c -+++ b/kernel/time/timekeeping.c -@@ -2319,8 +2319,10 @@ EXPORT_SYMBOL(hardpps); - */ - void xtime_update(unsigned long ticks) - { -- write_seqlock(&jiffies_lock); -+ raw_spin_lock(&jiffies_lock); -+ write_seqcount_begin(&jiffies_seq); - do_timer(ticks); -- write_sequnlock(&jiffies_lock); -+ write_seqcount_end(&jiffies_seq); -+ raw_spin_unlock(&jiffies_lock); - update_wall_time(); - } -diff --git a/kernel/time/timekeeping.h b/kernel/time/timekeeping.h -index 704f595ce83f..763a3e5121ff 100644 ---- a/kernel/time/timekeeping.h -+++ b/kernel/time/timekeeping.h -@@ -19,7 +19,8 @@ extern void timekeeping_resume(void); - extern void do_timer(unsigned long ticks); - extern void update_wall_time(void); - --extern seqlock_t jiffies_lock; -+extern raw_spinlock_t jiffies_lock; -+extern seqcount_t jiffies_seq; - - #define CS_NAME_LEN 32 - -diff --git a/kernel/time/timer.c b/kernel/time/timer.c -index 73164c3aa56b..b1d2d4026cfe 100644 ---- a/kernel/time/timer.c -+++ b/kernel/time/timer.c -@@ -59,43 +59,156 @@ __visible u64 jiffies_64 __cacheline_aligned_in_smp = INITIAL_JIFFIES; - EXPORT_SYMBOL(jiffies_64); - - /* -- * per-CPU timer vector definitions: -+ * The timer wheel has LVL_DEPTH array levels. Each level provides an array of -+ * LVL_SIZE buckets. Each level is driven by its own clock and therefor each -+ * level has a different granularity. -+ * -+ * The level granularity is: LVL_CLK_DIV ^ lvl -+ * The level clock frequency is: HZ / (LVL_CLK_DIV ^ level) -+ * -+ * The array level of a newly armed timer depends on the relative expiry -+ * time. The farther the expiry time is away the higher the array level and -+ * therefor the granularity becomes. -+ * -+ * Contrary to the original timer wheel implementation, which aims for 'exact' -+ * expiry of the timers, this implementation removes the need for recascading -+ * the timers into the lower array levels. The previous 'classic' timer wheel -+ * implementation of the kernel already violated the 'exact' expiry by adding -+ * slack to the expiry time to provide batched expiration. The granularity -+ * levels provide implicit batching. -+ * -+ * This is an optimization of the original timer wheel implementation for the -+ * majority of the timer wheel use cases: timeouts. The vast majority of -+ * timeout timers (networking, disk I/O ...) are canceled before expiry. If -+ * the timeout expires it indicates that normal operation is disturbed, so it -+ * does not matter much whether the timeout comes with a slight delay. -+ * -+ * The only exception to this are networking timers with a small expiry -+ * time. They rely on the granularity. Those fit into the first wheel level, -+ * which has HZ granularity. -+ * -+ * We don't have cascading anymore. timers with a expiry time above the -+ * capacity of the last wheel level are force expired at the maximum timeout -+ * value of the last wheel level. From data sampling we know that the maximum -+ * value observed is 5 days (network connection tracking), so this should not -+ * be an issue. -+ * -+ * The currently chosen array constants values are a good compromise between -+ * array size and granularity. -+ * -+ * This results in the following granularity and range levels: -+ * -+ * HZ 1000 steps -+ * Level Offset Granularity Range -+ * 0 0 1 ms 0 ms - 63 ms -+ * 1 64 8 ms 64 ms - 511 ms -+ * 2 128 64 ms 512 ms - 4095 ms (512ms - ~4s) -+ * 3 192 512 ms 4096 ms - 32767 ms (~4s - ~32s) -+ * 4 256 4096 ms (~4s) 32768 ms - 262143 ms (~32s - ~4m) -+ * 5 320 32768 ms (~32s) 262144 ms - 2097151 ms (~4m - ~34m) -+ * 6 384 262144 ms (~4m) 2097152 ms - 16777215 ms (~34m - ~4h) -+ * 7 448 2097152 ms (~34m) 16777216 ms - 134217727 ms (~4h - ~1d) -+ * 8 512 16777216 ms (~4h) 134217728 ms - 1073741822 ms (~1d - ~12d) -+ * -+ * HZ 300 -+ * Level Offset Granularity Range -+ * 0 0 3 ms 0 ms - 210 ms -+ * 1 64 26 ms 213 ms - 1703 ms (213ms - ~1s) -+ * 2 128 213 ms 1706 ms - 13650 ms (~1s - ~13s) -+ * 3 192 1706 ms (~1s) 13653 ms - 109223 ms (~13s - ~1m) -+ * 4 256 13653 ms (~13s) 109226 ms - 873810 ms (~1m - ~14m) -+ * 5 320 109226 ms (~1m) 873813 ms - 6990503 ms (~14m - ~1h) -+ * 6 384 873813 ms (~14m) 6990506 ms - 55924050 ms (~1h - ~15h) -+ * 7 448 6990506 ms (~1h) 55924053 ms - 447392423 ms (~15h - ~5d) -+ * 8 512 55924053 ms (~15h) 447392426 ms - 3579139406 ms (~5d - ~41d) -+ * -+ * HZ 250 -+ * Level Offset Granularity Range -+ * 0 0 4 ms 0 ms - 255 ms -+ * 1 64 32 ms 256 ms - 2047 ms (256ms - ~2s) -+ * 2 128 256 ms 2048 ms - 16383 ms (~2s - ~16s) -+ * 3 192 2048 ms (~2s) 16384 ms - 131071 ms (~16s - ~2m) -+ * 4 256 16384 ms (~16s) 131072 ms - 1048575 ms (~2m - ~17m) -+ * 5 320 131072 ms (~2m) 1048576 ms - 8388607 ms (~17m - ~2h) -+ * 6 384 1048576 ms (~17m) 8388608 ms - 67108863 ms (~2h - ~18h) -+ * 7 448 8388608 ms (~2h) 67108864 ms - 536870911 ms (~18h - ~6d) -+ * 8 512 67108864 ms (~18h) 536870912 ms - 4294967288 ms (~6d - ~49d) -+ * -+ * HZ 100 -+ * Level Offset Granularity Range -+ * 0 0 10 ms 0 ms - 630 ms -+ * 1 64 80 ms 640 ms - 5110 ms (640ms - ~5s) -+ * 2 128 640 ms 5120 ms - 40950 ms (~5s - ~40s) -+ * 3 192 5120 ms (~5s) 40960 ms - 327670 ms (~40s - ~5m) -+ * 4 256 40960 ms (~40s) 327680 ms - 2621430 ms (~5m - ~43m) -+ * 5 320 327680 ms (~5m) 2621440 ms - 20971510 ms (~43m - ~5h) -+ * 6 384 2621440 ms (~43m) 20971520 ms - 167772150 ms (~5h - ~1d) -+ * 7 448 20971520 ms (~5h) 167772160 ms - 1342177270 ms (~1d - ~15d) - */ --#define TVN_BITS (CONFIG_BASE_SMALL ? 4 : 6) --#define TVR_BITS (CONFIG_BASE_SMALL ? 6 : 8) --#define TVN_SIZE (1 << TVN_BITS) --#define TVR_SIZE (1 << TVR_BITS) --#define TVN_MASK (TVN_SIZE - 1) --#define TVR_MASK (TVR_SIZE - 1) --#define MAX_TVAL ((unsigned long)((1ULL << (TVR_BITS + 4*TVN_BITS)) - 1)) - --struct tvec { -- struct hlist_head vec[TVN_SIZE]; --}; -+/* Clock divisor for the next level */ -+#define LVL_CLK_SHIFT 3 -+#define LVL_CLK_DIV (1UL << LVL_CLK_SHIFT) -+#define LVL_CLK_MASK (LVL_CLK_DIV - 1) -+#define LVL_SHIFT(n) ((n) * LVL_CLK_SHIFT) -+#define LVL_GRAN(n) (1UL << LVL_SHIFT(n)) - --struct tvec_root { -- struct hlist_head vec[TVR_SIZE]; --}; -+/* -+ * The time start value for each level to select the bucket at enqueue -+ * time. -+ */ -+#define LVL_START(n) ((LVL_SIZE - 1) << (((n) - 1) * LVL_CLK_SHIFT)) - --struct tvec_base { -- spinlock_t lock; -- struct timer_list *running_timer; -- unsigned long timer_jiffies; -- unsigned long next_timer; -- unsigned long active_timers; -- unsigned long all_timers; -- int cpu; -- bool migration_enabled; -- bool nohz_active; -- struct tvec_root tv1; -- struct tvec tv2; -- struct tvec tv3; -- struct tvec tv4; -- struct tvec tv5; -+/* Size of each clock level */ -+#define LVL_BITS 6 -+#define LVL_SIZE (1UL << LVL_BITS) -+#define LVL_MASK (LVL_SIZE - 1) -+#define LVL_OFFS(n) ((n) * LVL_SIZE) -+ -+/* Level depth */ -+#if HZ > 100 -+# define LVL_DEPTH 9 -+# else -+# define LVL_DEPTH 8 -+#endif -+ -+/* The cutoff (max. capacity of the wheel) */ -+#define WHEEL_TIMEOUT_CUTOFF (LVL_START(LVL_DEPTH)) -+#define WHEEL_TIMEOUT_MAX (WHEEL_TIMEOUT_CUTOFF - LVL_GRAN(LVL_DEPTH - 1)) -+ -+/* -+ * The resulting wheel size. If NOHZ is configured we allocate two -+ * wheels so we have a separate storage for the deferrable timers. -+ */ -+#define WHEEL_SIZE (LVL_SIZE * LVL_DEPTH) -+ -+#ifdef CONFIG_NO_HZ_COMMON -+# define NR_BASES 2 -+# define BASE_STD 0 -+# define BASE_DEF 1 -+#else -+# define NR_BASES 1 -+# define BASE_STD 0 -+# define BASE_DEF 0 -+#endif -+ -+struct timer_base { -+ raw_spinlock_t lock; -+ struct timer_list *running_timer; -+#ifdef CONFIG_PREEMPT_RT_FULL -+ struct swait_queue_head wait_for_running_timer; -+#endif -+ unsigned long clk; -+ unsigned long next_expiry; -+ unsigned int cpu; -+ bool migration_enabled; -+ bool nohz_active; -+ bool is_idle; -+ DECLARE_BITMAP(pending_map, WHEEL_SIZE); -+ struct hlist_head vectors[WHEEL_SIZE]; - } ____cacheline_aligned; - -- --static DEFINE_PER_CPU(struct tvec_base, tvec_bases); -+static DEFINE_PER_CPU(struct timer_base, timer_bases[NR_BASES]); - - #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) - unsigned int sysctl_timer_migration = 1; -@@ -106,15 +219,17 @@ void timers_update_migration(bool update_nohz) - unsigned int cpu; - - /* Avoid the loop, if nothing to update */ -- if (this_cpu_read(tvec_bases.migration_enabled) == on) -+ if (this_cpu_read(timer_bases[BASE_STD].migration_enabled) == on) - return; - - for_each_possible_cpu(cpu) { -- per_cpu(tvec_bases.migration_enabled, cpu) = on; -+ per_cpu(timer_bases[BASE_STD].migration_enabled, cpu) = on; -+ per_cpu(timer_bases[BASE_DEF].migration_enabled, cpu) = on; - per_cpu(hrtimer_bases.migration_enabled, cpu) = on; - if (!update_nohz) - continue; -- per_cpu(tvec_bases.nohz_active, cpu) = true; -+ per_cpu(timer_bases[BASE_STD].nohz_active, cpu) = true; -+ per_cpu(timer_bases[BASE_DEF].nohz_active, cpu) = true; - per_cpu(hrtimer_bases.nohz_active, cpu) = true; - } - } -@@ -133,20 +248,6 @@ int timer_migration_handler(struct ctl_table *table, int write, - mutex_unlock(&mutex); - return ret; - } -- --static inline struct tvec_base *get_target_base(struct tvec_base *base, -- int pinned) --{ -- if (pinned || !base->migration_enabled) -- return this_cpu_ptr(&tvec_bases); -- return per_cpu_ptr(&tvec_bases, get_nohz_timer_target()); --} --#else --static inline struct tvec_base *get_target_base(struct tvec_base *base, -- int pinned) --{ -- return this_cpu_ptr(&tvec_bases); --} - #endif - - static unsigned long round_jiffies_common(unsigned long j, int cpu, -@@ -351,101 +452,126 @@ unsigned long round_jiffies_up_relative(unsigned long j) - } - EXPORT_SYMBOL_GPL(round_jiffies_up_relative); - --/** -- * set_timer_slack - set the allowed slack for a timer -- * @timer: the timer to be modified -- * @slack_hz: the amount of time (in jiffies) allowed for rounding -- * -- * Set the amount of time, in jiffies, that a certain timer has -- * in terms of slack. By setting this value, the timer subsystem -- * will schedule the actual timer somewhere between -- * the time mod_timer() asks for, and that time plus the slack. -- * -- * By setting the slack to -1, a percentage of the delay is used -- * instead. -- */ --void set_timer_slack(struct timer_list *timer, int slack_hz) -+ -+static inline unsigned int timer_get_idx(struct timer_list *timer) - { -- timer->slack = slack_hz; -+ return (timer->flags & TIMER_ARRAYMASK) >> TIMER_ARRAYSHIFT; -+} -+ -+static inline void timer_set_idx(struct timer_list *timer, unsigned int idx) -+{ -+ timer->flags = (timer->flags & ~TIMER_ARRAYMASK) | -+ idx << TIMER_ARRAYSHIFT; -+} -+ -+/* -+ * Helper function to calculate the array index for a given expiry -+ * time. -+ */ -+static inline unsigned calc_index(unsigned expires, unsigned lvl) -+{ -+ expires = (expires + LVL_GRAN(lvl)) >> LVL_SHIFT(lvl); -+ return LVL_OFFS(lvl) + (expires & LVL_MASK); -+} -+ -+static int calc_wheel_index(unsigned long expires, unsigned long clk) -+{ -+ unsigned long delta = expires - clk; -+ unsigned int idx; -+ -+ if (delta < LVL_START(1)) { -+ idx = calc_index(expires, 0); -+ } else if (delta < LVL_START(2)) { -+ idx = calc_index(expires, 1); -+ } else if (delta < LVL_START(3)) { -+ idx = calc_index(expires, 2); -+ } else if (delta < LVL_START(4)) { -+ idx = calc_index(expires, 3); -+ } else if (delta < LVL_START(5)) { -+ idx = calc_index(expires, 4); -+ } else if (delta < LVL_START(6)) { -+ idx = calc_index(expires, 5); -+ } else if (delta < LVL_START(7)) { -+ idx = calc_index(expires, 6); -+ } else if (LVL_DEPTH > 8 && delta < LVL_START(8)) { -+ idx = calc_index(expires, 7); -+ } else if ((long) delta < 0) { -+ idx = clk & LVL_MASK; -+ } else { -+ /* -+ * Force expire obscene large timeouts to expire at the -+ * capacity limit of the wheel. -+ */ -+ if (expires >= WHEEL_TIMEOUT_CUTOFF) -+ expires = WHEEL_TIMEOUT_MAX; -+ -+ idx = calc_index(expires, LVL_DEPTH - 1); -+ } -+ return idx; -+} -+ -+/* -+ * Enqueue the timer into the hash bucket, mark it pending in -+ * the bitmap and store the index in the timer flags. -+ */ -+static void enqueue_timer(struct timer_base *base, struct timer_list *timer, -+ unsigned int idx) -+{ -+ hlist_add_head(&timer->entry, base->vectors + idx); -+ __set_bit(idx, base->pending_map); -+ timer_set_idx(timer, idx); - } --EXPORT_SYMBOL_GPL(set_timer_slack); - - static void --__internal_add_timer(struct tvec_base *base, struct timer_list *timer) -+__internal_add_timer(struct timer_base *base, struct timer_list *timer) - { -- unsigned long expires = timer->expires; -- unsigned long idx = expires - base->timer_jiffies; -- struct hlist_head *vec; -+ unsigned int idx; - -- if (idx < TVR_SIZE) { -- int i = expires & TVR_MASK; -- vec = base->tv1.vec + i; -- } else if (idx < 1 << (TVR_BITS + TVN_BITS)) { -- int i = (expires >> TVR_BITS) & TVN_MASK; -- vec = base->tv2.vec + i; -- } else if (idx < 1 << (TVR_BITS + 2 * TVN_BITS)) { -- int i = (expires >> (TVR_BITS + TVN_BITS)) & TVN_MASK; -- vec = base->tv3.vec + i; -- } else if (idx < 1 << (TVR_BITS + 3 * TVN_BITS)) { -- int i = (expires >> (TVR_BITS + 2 * TVN_BITS)) & TVN_MASK; -- vec = base->tv4.vec + i; -- } else if ((signed long) idx < 0) { -- /* -- * Can happen if you add a timer with expires == jiffies, -- * or you set a timer to go off in the past -- */ -- vec = base->tv1.vec + (base->timer_jiffies & TVR_MASK); -- } else { -- int i; -- /* If the timeout is larger than MAX_TVAL (on 64-bit -- * architectures or with CONFIG_BASE_SMALL=1) then we -- * use the maximum timeout. -- */ -- if (idx > MAX_TVAL) { -- idx = MAX_TVAL; -- expires = idx + base->timer_jiffies; -- } -- i = (expires >> (TVR_BITS + 3 * TVN_BITS)) & TVN_MASK; -- vec = base->tv5.vec + i; -- } -- -- hlist_add_head(&timer->entry, vec); -+ idx = calc_wheel_index(timer->expires, base->clk); -+ enqueue_timer(base, timer, idx); - } - --static void internal_add_timer(struct tvec_base *base, struct timer_list *timer) -+static void -+trigger_dyntick_cpu(struct timer_base *base, struct timer_list *timer) - { -- /* Advance base->jiffies, if the base is empty */ -- if (!base->all_timers++) -- base->timer_jiffies = jiffies; -- -- __internal_add_timer(base, timer); -- /* -- * Update base->active_timers and base->next_timer -- */ -- if (!(timer->flags & TIMER_DEFERRABLE)) { -- if (!base->active_timers++ || -- time_before(timer->expires, base->next_timer)) -- base->next_timer = timer->expires; -- } -+ if (!IS_ENABLED(CONFIG_NO_HZ_COMMON) || !base->nohz_active) -+ return; - - /* -- * Check whether the other CPU is in dynticks mode and needs -- * to be triggered to reevaluate the timer wheel. -- * We are protected against the other CPU fiddling -- * with the timer by holding the timer base lock. This also -- * makes sure that a CPU on the way to stop its tick can not -- * evaluate the timer wheel. -- * -- * Spare the IPI for deferrable timers on idle targets though. -- * The next busy ticks will take care of it. Except full dynticks -- * require special care against races with idle_cpu(), lets deal -- * with that later. -+ * This wants some optimizing similar to the below, but we do that -+ * when we switch from push to pull for deferrable timers. - */ -- if (base->nohz_active) { -- if (!(timer->flags & TIMER_DEFERRABLE) || -- tick_nohz_full_cpu(base->cpu)) -+ if (timer->flags & TIMER_DEFERRABLE) { -+ if (tick_nohz_full_cpu(base->cpu)) - wake_up_nohz_cpu(base->cpu); -+ return; - } -+ -+ /* -+ * We might have to IPI the remote CPU if the base is idle and the -+ * timer is not deferrable. If the other cpu is on the way to idle -+ * then it can't set base->is_idle as we hold base lock. -+ */ -+ if (!base->is_idle) -+ return; -+ -+ /* Check whether this is the new first expiring timer */ -+ if (time_after_eq(timer->expires, base->next_expiry)) -+ return; -+ -+ /* -+ * Set the next expiry time and kick the cpu so it can reevaluate the -+ * wheel -+ */ -+ base->next_expiry = timer->expires; -+ wake_up_nohz_cpu(base->cpu); -+} -+ -+static void -+internal_add_timer(struct timer_base *base, struct timer_list *timer) -+{ -+ __internal_add_timer(base, timer); -+ trigger_dyntick_cpu(base, timer); - } - - #ifdef CONFIG_TIMER_STATS -@@ -681,7 +807,6 @@ static void do_init_timer(struct timer_list *timer, unsigned int flags, - { - timer->entry.pprev = NULL; - timer->flags = flags | raw_smp_processor_id(); -- timer->slack = -1; - #ifdef CONFIG_TIMER_STATS - timer->start_site = NULL; - timer->start_pid = -1; -@@ -721,71 +846,170 @@ static inline void detach_timer(struct timer_list *timer, bool clear_pending) - entry->next = LIST_POISON2; - } - --static inline void --detach_expired_timer(struct timer_list *timer, struct tvec_base *base) --{ -- detach_timer(timer, true); -- if (!(timer->flags & TIMER_DEFERRABLE)) -- base->active_timers--; -- base->all_timers--; --} -- --static int detach_if_pending(struct timer_list *timer, struct tvec_base *base, -+static int detach_if_pending(struct timer_list *timer, struct timer_base *base, - bool clear_pending) - { -+ unsigned idx = timer_get_idx(timer); -+ - if (!timer_pending(timer)) - return 0; - -+ if (hlist_is_singular_node(&timer->entry, base->vectors + idx)) -+ __clear_bit(idx, base->pending_map); -+ - detach_timer(timer, clear_pending); -- if (!(timer->flags & TIMER_DEFERRABLE)) { -- base->active_timers--; -- if (timer->expires == base->next_timer) -- base->next_timer = base->timer_jiffies; -- } -- /* If this was the last timer, advance base->jiffies */ -- if (!--base->all_timers) -- base->timer_jiffies = jiffies; - return 1; - } - -+static inline struct timer_base *get_timer_cpu_base(u32 tflags, u32 cpu) -+{ -+ struct timer_base *base = per_cpu_ptr(&timer_bases[BASE_STD], cpu); -+ -+ /* -+ * If the timer is deferrable and nohz is active then we need to use -+ * the deferrable base. -+ */ -+ if (IS_ENABLED(CONFIG_NO_HZ_COMMON) && base->nohz_active && -+ (tflags & TIMER_DEFERRABLE)) -+ base = per_cpu_ptr(&timer_bases[BASE_DEF], cpu); -+ return base; -+} -+ -+static inline struct timer_base *get_timer_this_cpu_base(u32 tflags) -+{ -+ struct timer_base *base = this_cpu_ptr(&timer_bases[BASE_STD]); -+ -+ /* -+ * If the timer is deferrable and nohz is active then we need to use -+ * the deferrable base. -+ */ -+ if (IS_ENABLED(CONFIG_NO_HZ_COMMON) && base->nohz_active && -+ (tflags & TIMER_DEFERRABLE)) -+ base = this_cpu_ptr(&timer_bases[BASE_DEF]); -+ return base; -+} -+ -+static inline struct timer_base *get_timer_base(u32 tflags) -+{ -+ return get_timer_cpu_base(tflags, tflags & TIMER_CPUMASK); -+} -+ -+#ifdef CONFIG_NO_HZ_COMMON -+static inline struct timer_base *__get_target_base(struct timer_base *base, -+ unsigned tflags) -+{ -+#ifdef CONFIG_SMP -+ if ((tflags & TIMER_PINNED) || !base->migration_enabled) -+ return get_timer_this_cpu_base(tflags); -+ return get_timer_cpu_base(tflags, get_nohz_timer_target()); -+#else -+ return get_timer_this_cpu_base(tflags); -+#endif -+} -+ -+static inline void forward_timer_base(struct timer_base *base) -+{ -+ /* -+ * We only forward the base when it's idle and we have a delta between -+ * base clock and jiffies. -+ */ -+ if (!base->is_idle || (long) (jiffies - base->clk) < 2) -+ return; -+ -+ /* -+ * If the next expiry value is > jiffies, then we fast forward to -+ * jiffies otherwise we forward to the next expiry value. -+ */ -+ if (time_after(base->next_expiry, jiffies)) -+ base->clk = jiffies; -+ else -+ base->clk = base->next_expiry; -+} -+#else -+static inline struct timer_base *__get_target_base(struct timer_base *base, -+ unsigned tflags) -+{ -+ return get_timer_this_cpu_base(tflags); -+} -+ -+static inline void forward_timer_base(struct timer_base *base) { } -+#endif -+ -+static inline struct timer_base *get_target_base(struct timer_base *base, -+ unsigned tflags) -+{ -+ struct timer_base *target = __get_target_base(base, tflags); -+ -+ forward_timer_base(target); -+ return target; -+} -+ - /* -- * We are using hashed locking: holding per_cpu(tvec_bases).lock -- * means that all timers which are tied to this base via timer->base are -- * locked, and the base itself is locked too. -+ * We are using hashed locking: Holding per_cpu(timer_bases[x]).lock means -+ * that all timers which are tied to this base are locked, and the base itself -+ * is locked too. - * - * So __run_timers/migrate_timers can safely modify all timers which could -- * be found on ->tvX lists. -+ * be found in the base->vectors array. - * -- * When the timer's base is locked and removed from the list, the -- * TIMER_MIGRATING flag is set, FIXME -+ * When a timer is migrating then the TIMER_MIGRATING flag is set and we need -+ * to wait until the migration is done. - */ --static struct tvec_base *lock_timer_base(struct timer_list *timer, -- unsigned long *flags) -+static struct timer_base *lock_timer_base(struct timer_list *timer, -+ unsigned long *flags) - __acquires(timer->base->lock) - { - for (;;) { -+ struct timer_base *base; - u32 tf = timer->flags; -- struct tvec_base *base; - - if (!(tf & TIMER_MIGRATING)) { -- base = per_cpu_ptr(&tvec_bases, tf & TIMER_CPUMASK); -- spin_lock_irqsave(&base->lock, *flags); -+ base = get_timer_base(tf); -+ raw_spin_lock_irqsave(&base->lock, *flags); - if (timer->flags == tf) - return base; -- spin_unlock_irqrestore(&base->lock, *flags); -+ raw_spin_unlock_irqrestore(&base->lock, *flags); - } - cpu_relax(); - } - } - - static inline int --__mod_timer(struct timer_list *timer, unsigned long expires, -- bool pending_only, int pinned) -+__mod_timer(struct timer_list *timer, unsigned long expires, bool pending_only) - { -- struct tvec_base *base, *new_base; -- unsigned long flags; -+ struct timer_base *base, *new_base; -+ unsigned int idx = UINT_MAX; -+ unsigned long clk = 0, flags; - int ret = 0; - -+ /* -+ * This is a common optimization triggered by the networking code - if -+ * the timer is re-modified to be the same thing or ends up in the -+ * same array bucket then just return: -+ */ -+ if (timer_pending(timer)) { -+ if (timer->expires == expires) -+ return 1; -+ /* -+ * Take the current timer_jiffies of base, but without holding -+ * the lock! -+ */ -+ base = get_timer_base(timer->flags); -+ clk = base->clk; -+ -+ idx = calc_wheel_index(expires, clk); -+ -+ /* -+ * Retrieve and compare the array index of the pending -+ * timer. If it matches set the expiry to the new value so a -+ * subsequent call will exit in the expires check above. -+ */ -+ if (idx == timer_get_idx(timer)) { -+ timer->expires = expires; -+ return 1; -+ } -+ } -+ - timer_stats_timer_set_start_info(timer); - BUG_ON(!timer->function); - -@@ -797,33 +1021,44 @@ __mod_timer(struct timer_list *timer, unsigned long expires, - - debug_activate(timer, expires); - -- new_base = get_target_base(base, pinned); -+ new_base = get_target_base(base, timer->flags); - - if (base != new_base) { - /* -- * We are trying to schedule the timer on the local CPU. -+ * We are trying to schedule the timer on the new base. - * However we can't change timer's base while it is running, - * otherwise del_timer_sync() can't detect that the timer's -- * handler yet has not finished. This also guarantees that -- * the timer is serialized wrt itself. -+ * handler yet has not finished. This also guarantees that the -+ * timer is serialized wrt itself. - */ - if (likely(base->running_timer != timer)) { - /* See the comment in lock_timer_base() */ - timer->flags |= TIMER_MIGRATING; - -- spin_unlock(&base->lock); -+ raw_spin_unlock(&base->lock); - base = new_base; -- spin_lock(&base->lock); -+ raw_spin_lock(&base->lock); - WRITE_ONCE(timer->flags, - (timer->flags & ~TIMER_BASEMASK) | base->cpu); - } - } - - timer->expires = expires; -- internal_add_timer(base, timer); -+ /* -+ * If idx was calculated above and the base time did not advance -+ * between calculating idx and taking the lock, only enqueue_timer() -+ * and trigger_dyntick_cpu() is required. Otherwise we need to -+ * (re)calculate the wheel index via internal_add_timer(). -+ */ -+ if (idx != UINT_MAX && clk == base->clk) { -+ enqueue_timer(base, timer, idx); -+ trigger_dyntick_cpu(base, timer); -+ } else { -+ internal_add_timer(base, timer); -+ } - - out_unlock: -- spin_unlock_irqrestore(&base->lock, flags); -+ raw_spin_unlock_irqrestore(&base->lock, flags); - - return ret; - } -@@ -840,49 +1075,10 @@ __mod_timer(struct timer_list *timer, unsigned long expires, - */ - int mod_timer_pending(struct timer_list *timer, unsigned long expires) - { -- return __mod_timer(timer, expires, true, TIMER_NOT_PINNED); -+ return __mod_timer(timer, expires, true); - } - EXPORT_SYMBOL(mod_timer_pending); - --/* -- * Decide where to put the timer while taking the slack into account -- * -- * Algorithm: -- * 1) calculate the maximum (absolute) time -- * 2) calculate the highest bit where the expires and new max are different -- * 3) use this bit to make a mask -- * 4) use the bitmask to round down the maximum time, so that all last -- * bits are zeros -- */ --static inline --unsigned long apply_slack(struct timer_list *timer, unsigned long expires) --{ -- unsigned long expires_limit, mask; -- int bit; -- -- if (timer->slack >= 0) { -- expires_limit = expires + timer->slack; -- } else { -- long delta = expires - jiffies; -- -- if (delta < 256) -- return expires; -- -- expires_limit = expires + delta / 256; -- } -- mask = expires ^ expires_limit; -- if (mask == 0) -- return expires; -- -- bit = __fls(mask); -- -- mask = (1UL << bit) - 1; -- -- expires_limit = expires_limit & ~(mask); -- -- return expires_limit; --} -- - /** - * mod_timer - modify a timer's timeout - * @timer: the timer to be modified -@@ -905,49 +1101,11 @@ unsigned long apply_slack(struct timer_list *timer, unsigned long expires) - */ - int mod_timer(struct timer_list *timer, unsigned long expires) - { -- expires = apply_slack(timer, expires); -- -- /* -- * This is a common optimization triggered by the -- * networking code - if the timer is re-modified -- * to be the same thing then just return: -- */ -- if (timer_pending(timer) && timer->expires == expires) -- return 1; -- -- return __mod_timer(timer, expires, false, TIMER_NOT_PINNED); -+ return __mod_timer(timer, expires, false); - } - EXPORT_SYMBOL(mod_timer); - - /** -- * mod_timer_pinned - modify a timer's timeout -- * @timer: the timer to be modified -- * @expires: new timeout in jiffies -- * -- * mod_timer_pinned() is a way to update the expire field of an -- * active timer (if the timer is inactive it will be activated) -- * and to ensure that the timer is scheduled on the current CPU. -- * -- * Note that this does not prevent the timer from being migrated -- * when the current CPU goes offline. If this is a problem for -- * you, use CPU-hotplug notifiers to handle it correctly, for -- * example, cancelling the timer when the corresponding CPU goes -- * offline. -- * -- * mod_timer_pinned(timer, expires) is equivalent to: -- * -- * del_timer(timer); timer->expires = expires; add_timer(timer); -- */ --int mod_timer_pinned(struct timer_list *timer, unsigned long expires) --{ -- if (timer->expires == expires && timer_pending(timer)) -- return 1; -- -- return __mod_timer(timer, expires, false, TIMER_PINNED); --} --EXPORT_SYMBOL(mod_timer_pinned); -- --/** - * add_timer - start a timer - * @timer: the timer to be added - * -@@ -977,13 +1135,14 @@ EXPORT_SYMBOL(add_timer); - */ - void add_timer_on(struct timer_list *timer, int cpu) - { -- struct tvec_base *new_base = per_cpu_ptr(&tvec_bases, cpu); -- struct tvec_base *base; -+ struct timer_base *new_base, *base; - unsigned long flags; - - timer_stats_timer_set_start_info(timer); - BUG_ON(timer_pending(timer) || !timer->function); - -+ new_base = get_timer_cpu_base(timer->flags, cpu); -+ - /* - * If @timer was on a different CPU, it should be migrated with the - * old base locked to prevent other operations proceeding with the -@@ -993,19 +1152,46 @@ void add_timer_on(struct timer_list *timer, int cpu) - if (base != new_base) { - timer->flags |= TIMER_MIGRATING; - -- spin_unlock(&base->lock); -+ raw_spin_unlock(&base->lock); - base = new_base; -- spin_lock(&base->lock); -+ raw_spin_lock(&base->lock); - WRITE_ONCE(timer->flags, - (timer->flags & ~TIMER_BASEMASK) | cpu); - } - - debug_activate(timer, timer->expires); - internal_add_timer(base, timer); -- spin_unlock_irqrestore(&base->lock, flags); -+ raw_spin_unlock_irqrestore(&base->lock, flags); - } - EXPORT_SYMBOL_GPL(add_timer_on); - -+#ifdef CONFIG_PREEMPT_RT_FULL -+/* -+ * Wait for a running timer -+ */ -+static void wait_for_running_timer(struct timer_list *timer) -+{ -+ struct timer_base *base; -+ u32 tf = timer->flags; -+ -+ if (tf & TIMER_MIGRATING) -+ return; -+ -+ base = get_timer_base(tf); -+ swait_event(base->wait_for_running_timer, -+ base->running_timer != timer); -+} -+ -+# define wakeup_timer_waiters(b) swake_up_all(&(b)->wait_for_running_timer) -+#else -+static inline void wait_for_running_timer(struct timer_list *timer) -+{ -+ cpu_relax(); -+} -+ -+# define wakeup_timer_waiters(b) do { } while (0) -+#endif -+ - /** - * del_timer - deactive a timer. - * @timer: the timer to be deactivated -@@ -1019,7 +1205,7 @@ EXPORT_SYMBOL_GPL(add_timer_on); - */ - int del_timer(struct timer_list *timer) - { -- struct tvec_base *base; -+ struct timer_base *base; - unsigned long flags; - int ret = 0; - -@@ -1029,7 +1215,7 @@ int del_timer(struct timer_list *timer) - if (timer_pending(timer)) { - base = lock_timer_base(timer, &flags); - ret = detach_if_pending(timer, base, true); -- spin_unlock_irqrestore(&base->lock, flags); -+ raw_spin_unlock_irqrestore(&base->lock, flags); - } - - return ret; -@@ -1045,7 +1231,7 @@ EXPORT_SYMBOL(del_timer); - */ - int try_to_del_timer_sync(struct timer_list *timer) - { -- struct tvec_base *base; -+ struct timer_base *base; - unsigned long flags; - int ret = -1; - -@@ -1057,13 +1243,13 @@ int try_to_del_timer_sync(struct timer_list *timer) - timer_stats_timer_clear_start_info(timer); - ret = detach_if_pending(timer, base, true); - } -- spin_unlock_irqrestore(&base->lock, flags); -+ raw_spin_unlock_irqrestore(&base->lock, flags); - - return ret; - } - EXPORT_SYMBOL(try_to_del_timer_sync); - --#ifdef CONFIG_SMP -+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL) - /** - * del_timer_sync - deactivate a timer and wait for the handler to finish. - * @timer: the timer to be deactivated -@@ -1123,33 +1309,12 @@ int del_timer_sync(struct timer_list *timer) - int ret = try_to_del_timer_sync(timer); - if (ret >= 0) - return ret; -- cpu_relax(); -+ wait_for_running_timer(timer); - } - } - EXPORT_SYMBOL(del_timer_sync); - #endif - --static int cascade(struct tvec_base *base, struct tvec *tv, int index) --{ -- /* cascade all the timers from tv up one level */ -- struct timer_list *timer; -- struct hlist_node *tmp; -- struct hlist_head tv_list; -- -- hlist_move_list(tv->vec + index, &tv_list); -- -- /* -- * We are removing _all_ timers from the list, so we -- * don't have to detach them individually. -- */ -- hlist_for_each_entry_safe(timer, tmp, &tv_list, entry) { -- /* No accounting, while moving them */ -- __internal_add_timer(base, timer); -- } -- -- return index; --} -- - static void call_timer_fn(struct timer_list *timer, void (*fn)(unsigned long), - unsigned long data) - { -@@ -1193,147 +1358,144 @@ static void call_timer_fn(struct timer_list *timer, void (*fn)(unsigned long), - } - } - --#define INDEX(N) ((base->timer_jiffies >> (TVR_BITS + (N) * TVN_BITS)) & TVN_MASK) -- --/** -- * __run_timers - run all expired timers (if any) on this CPU. -- * @base: the timer vector to be processed. -- * -- * This function cascades all vectors and executes all expired timer -- * vectors. -- */ --static inline void __run_timers(struct tvec_base *base) -+static void expire_timers(struct timer_base *base, struct hlist_head *head) - { -- struct timer_list *timer; -+ while (!hlist_empty(head)) { -+ struct timer_list *timer; -+ void (*fn)(unsigned long); -+ unsigned long data; - -- spin_lock_irq(&base->lock); -+ timer = hlist_entry(head->first, struct timer_list, entry); -+ timer_stats_account_timer(timer); - -- while (time_after_eq(jiffies, base->timer_jiffies)) { -- struct hlist_head work_list; -- struct hlist_head *head = &work_list; -- int index; -+ base->running_timer = timer; -+ detach_timer(timer, true); - -- if (!base->all_timers) { -- base->timer_jiffies = jiffies; -- break; -- } -+ fn = timer->function; -+ data = timer->data; - -- index = base->timer_jiffies & TVR_MASK; -- -- /* -- * Cascade timers: -- */ -- if (!index && -- (!cascade(base, &base->tv2, INDEX(0))) && -- (!cascade(base, &base->tv3, INDEX(1))) && -- !cascade(base, &base->tv4, INDEX(2))) -- cascade(base, &base->tv5, INDEX(3)); -- ++base->timer_jiffies; -- hlist_move_list(base->tv1.vec + index, head); -- while (!hlist_empty(head)) { -- void (*fn)(unsigned long); -- unsigned long data; -- bool irqsafe; -- -- timer = hlist_entry(head->first, struct timer_list, entry); -- fn = timer->function; -- data = timer->data; -- irqsafe = timer->flags & TIMER_IRQSAFE; -- -- timer_stats_account_timer(timer); -- -- base->running_timer = timer; -- detach_expired_timer(timer, base); -- -- if (irqsafe) { -- spin_unlock(&base->lock); -- call_timer_fn(timer, fn, data); -- spin_lock(&base->lock); -- } else { -- spin_unlock_irq(&base->lock); -- call_timer_fn(timer, fn, data); -- spin_lock_irq(&base->lock); -- } -+ if (!IS_ENABLED(CONFIG_PREEMPT_RT_FULL) && -+ timer->flags & TIMER_IRQSAFE) { -+ raw_spin_unlock(&base->lock); -+ call_timer_fn(timer, fn, data); -+ base->running_timer = NULL; -+ raw_spin_lock(&base->lock); -+ } else { -+ raw_spin_unlock_irq(&base->lock); -+ call_timer_fn(timer, fn, data); -+ base->running_timer = NULL; -+ raw_spin_lock_irq(&base->lock); - } - } -- base->running_timer = NULL; -- spin_unlock_irq(&base->lock); -+} -+ -+static int __collect_expired_timers(struct timer_base *base, -+ struct hlist_head *heads) -+{ -+ unsigned long clk = base->clk; -+ struct hlist_head *vec; -+ int i, levels = 0; -+ unsigned int idx; -+ -+ for (i = 0; i < LVL_DEPTH; i++) { -+ idx = (clk & LVL_MASK) + i * LVL_SIZE; -+ -+ if (__test_and_clear_bit(idx, base->pending_map)) { -+ vec = base->vectors + idx; -+ hlist_move_list(vec, heads++); -+ levels++; -+ } -+ /* Is it time to look at the next level? */ -+ if (clk & LVL_CLK_MASK) -+ break; -+ /* Shift clock for the next level granularity */ -+ clk >>= LVL_CLK_SHIFT; -+ } -+ return levels; - } - - #ifdef CONFIG_NO_HZ_COMMON - /* -- * Find out when the next timer event is due to happen. This -- * is used on S/390 to stop all activity when a CPU is idle. -- * This function needs to be called with interrupts disabled. -+ * Find the next pending bucket of a level. Search from level start (@offset) -+ * + @clk upwards and if nothing there, search from start of the level -+ * (@offset) up to @offset + clk. - */ --static unsigned long __next_timer_interrupt(struct tvec_base *base) -+static int next_pending_bucket(struct timer_base *base, unsigned offset, -+ unsigned clk) - { -- unsigned long timer_jiffies = base->timer_jiffies; -- unsigned long expires = timer_jiffies + NEXT_TIMER_MAX_DELTA; -- int index, slot, array, found = 0; -- struct timer_list *nte; -- struct tvec *varray[4]; -+ unsigned pos, start = offset + clk; -+ unsigned end = offset + LVL_SIZE; - -- /* Look for timer events in tv1. */ -- index = slot = timer_jiffies & TVR_MASK; -- do { -- hlist_for_each_entry(nte, base->tv1.vec + slot, entry) { -- if (nte->flags & TIMER_DEFERRABLE) -- continue; -+ pos = find_next_bit(base->pending_map, end, start); -+ if (pos < end) -+ return pos - start; - -- found = 1; -- expires = nte->expires; -- /* Look at the cascade bucket(s)? */ -- if (!index || slot < index) -- goto cascade; -- return expires; -+ pos = find_next_bit(base->pending_map, start, offset); -+ return pos < start ? pos + LVL_SIZE - start : -1; -+} -+ -+/* -+ * Search the first expiring timer in the various clock levels. Caller must -+ * hold base->lock. -+ */ -+static unsigned long __next_timer_interrupt(struct timer_base *base) -+{ -+ unsigned long clk, next, adj; -+ unsigned lvl, offset = 0; -+ -+ next = base->clk + NEXT_TIMER_MAX_DELTA; -+ clk = base->clk; -+ for (lvl = 0; lvl < LVL_DEPTH; lvl++, offset += LVL_SIZE) { -+ int pos = next_pending_bucket(base, offset, clk & LVL_MASK); -+ -+ if (pos >= 0) { -+ unsigned long tmp = clk + (unsigned long) pos; -+ -+ tmp <<= LVL_SHIFT(lvl); -+ if (time_before(tmp, next)) -+ next = tmp; - } -- slot = (slot + 1) & TVR_MASK; -- } while (slot != index); -- --cascade: -- /* Calculate the next cascade event */ -- if (index) -- timer_jiffies += TVR_SIZE - index; -- timer_jiffies >>= TVR_BITS; -- -- /* Check tv2-tv5. */ -- varray[0] = &base->tv2; -- varray[1] = &base->tv3; -- varray[2] = &base->tv4; -- varray[3] = &base->tv5; -- -- for (array = 0; array < 4; array++) { -- struct tvec *varp = varray[array]; -- -- index = slot = timer_jiffies & TVN_MASK; -- do { -- hlist_for_each_entry(nte, varp->vec + slot, entry) { -- if (nte->flags & TIMER_DEFERRABLE) -- continue; -- -- found = 1; -- if (time_before(nte->expires, expires)) -- expires = nte->expires; -- } -- /* -- * Do we still search for the first timer or are -- * we looking up the cascade buckets ? -- */ -- if (found) { -- /* Look at the cascade bucket(s)? */ -- if (!index || slot < index) -- break; -- return expires; -- } -- slot = (slot + 1) & TVN_MASK; -- } while (slot != index); -- -- if (index) -- timer_jiffies += TVN_SIZE - index; -- timer_jiffies >>= TVN_BITS; -+ /* -+ * Clock for the next level. If the current level clock lower -+ * bits are zero, we look at the next level as is. If not we -+ * need to advance it by one because that's going to be the -+ * next expiring bucket in that level. base->clk is the next -+ * expiring jiffie. So in case of: -+ * -+ * LVL5 LVL4 LVL3 LVL2 LVL1 LVL0 -+ * 0 0 0 0 0 0 -+ * -+ * we have to look at all levels @index 0. With -+ * -+ * LVL5 LVL4 LVL3 LVL2 LVL1 LVL0 -+ * 0 0 0 0 0 2 -+ * -+ * LVL0 has the next expiring bucket @index 2. The upper -+ * levels have the next expiring bucket @index 1. -+ * -+ * In case that the propagation wraps the next level the same -+ * rules apply: -+ * -+ * LVL5 LVL4 LVL3 LVL2 LVL1 LVL0 -+ * 0 0 0 0 F 2 -+ * -+ * So after looking at LVL0 we get: -+ * -+ * LVL5 LVL4 LVL3 LVL2 LVL1 -+ * 0 0 0 1 0 -+ * -+ * So no propagation from LVL1 to LVL2 because that happened -+ * with the add already, but then we need to propagate further -+ * from LVL2 to LVL3. -+ * -+ * So the simple check whether the lower bits of the current -+ * level are 0 or not is sufficient for all cases. -+ */ -+ adj = clk & LVL_CLK_MASK ? 1 : 0; -+ clk >>= LVL_CLK_SHIFT; -+ clk += adj; - } -- return expires; -+ return next; - } - - /* -@@ -1379,7 +1541,7 @@ static u64 cmp_next_hrtimer_event(u64 basem, u64 expires) - */ - u64 get_next_timer_interrupt(unsigned long basej, u64 basem) - { -- struct tvec_base *base = this_cpu_ptr(&tvec_bases); -+ struct timer_base *base = this_cpu_ptr(&timer_bases[BASE_STD]); - u64 expires = KTIME_MAX; - unsigned long nextevt; - -@@ -1390,20 +1552,81 @@ u64 get_next_timer_interrupt(unsigned long basej, u64 basem) - if (cpu_is_offline(smp_processor_id())) - return expires; - -- spin_lock(&base->lock); -- if (base->active_timers) { -- if (time_before_eq(base->next_timer, base->timer_jiffies)) -- base->next_timer = __next_timer_interrupt(base); -- nextevt = base->next_timer; -- if (time_before_eq(nextevt, basej)) -- expires = basem; -- else -- expires = basem + (nextevt - basej) * TICK_NSEC; -+ raw_spin_lock(&base->lock); -+ nextevt = __next_timer_interrupt(base); -+ base->next_expiry = nextevt; -+ /* -+ * We have a fresh next event. Check whether we can forward the base. -+ */ -+ if (time_after(nextevt, jiffies)) -+ base->clk = jiffies; -+ else if (time_after(nextevt, base->clk)) -+ base->clk = nextevt; -+ -+ if (time_before_eq(nextevt, basej)) { -+ expires = basem; -+ base->is_idle = false; -+ } else { -+ expires = basem + (nextevt - basej) * TICK_NSEC; -+ /* -+ * If we expect to sleep more than a tick, mark the base idle. -+ */ -+ if ((expires - basem) > TICK_NSEC) -+ base->is_idle = true; - } -- spin_unlock(&base->lock); -+ raw_spin_unlock(&base->lock); - - return cmp_next_hrtimer_event(basem, expires); - } -+ -+/** -+ * timer_clear_idle - Clear the idle state of the timer base -+ * -+ * Called with interrupts disabled -+ */ -+void timer_clear_idle(void) -+{ -+ struct timer_base *base = this_cpu_ptr(&timer_bases[BASE_STD]); -+ -+ /* -+ * We do this unlocked. The worst outcome is a remote enqueue sending -+ * a pointless IPI, but taking the lock would just make the window for -+ * sending the IPI a few instructions smaller for the cost of taking -+ * the lock in the exit from idle path. -+ */ -+ base->is_idle = false; -+} -+ -+static int collect_expired_timers(struct timer_base *base, -+ struct hlist_head *heads) -+{ -+ /* -+ * NOHZ optimization. After a long idle sleep we need to forward the -+ * base to current jiffies. Avoid a loop by searching the bitfield for -+ * the next expiring timer. -+ */ -+ if ((long)(jiffies - base->clk) > 2) { -+ unsigned long next = __next_timer_interrupt(base); -+ -+ /* -+ * If the next timer is ahead of time forward to current -+ * jiffies, otherwise forward to the next expiry time. -+ */ -+ if (time_after(next, jiffies)) { -+ /* The call site will increment clock! */ -+ base->clk = jiffies - 1; -+ return 0; -+ } -+ base->clk = next; -+ } -+ return __collect_expired_timers(base, heads); -+} -+#else -+static inline int collect_expired_timers(struct timer_base *base, -+ struct hlist_head *heads) -+{ -+ return __collect_expired_timers(base, heads); -+} - #endif - - /* -@@ -1416,25 +1639,54 @@ void update_process_times(int user_tick) - - /* Note: this timer irq context must be accounted for as well. */ - account_process_tick(p, user_tick); -+ scheduler_tick(); - run_local_timers(); - rcu_check_callbacks(user_tick); --#ifdef CONFIG_IRQ_WORK -+#if defined(CONFIG_IRQ_WORK) - if (in_irq()) - irq_work_tick(); - #endif -- scheduler_tick(); - run_posix_cpu_timers(p); - } - -+/** -+ * __run_timers - run all expired timers (if any) on this CPU. -+ * @base: the timer vector to be processed. -+ */ -+static inline void __run_timers(struct timer_base *base) -+{ -+ struct hlist_head heads[LVL_DEPTH]; -+ int levels; -+ -+ if (!time_after_eq(jiffies, base->clk)) -+ return; -+ -+ raw_spin_lock_irq(&base->lock); -+ -+ while (time_after_eq(jiffies, base->clk)) { -+ -+ levels = collect_expired_timers(base, heads); -+ base->clk++; -+ -+ while (levels--) -+ expire_timers(base, heads + levels); -+ } -+ raw_spin_unlock_irq(&base->lock); -+ wakeup_timer_waiters(base); -+} -+ - /* - * This function runs timers and the timer-tq in bottom half context. - */ - static void run_timer_softirq(struct softirq_action *h) - { -- struct tvec_base *base = this_cpu_ptr(&tvec_bases); -+ struct timer_base *base = this_cpu_ptr(&timer_bases[BASE_STD]); - -- if (time_after_eq(jiffies, base->timer_jiffies)) -- __run_timers(base); -+ irq_work_tick_soft(); -+ -+ __run_timers(base); -+ if (IS_ENABLED(CONFIG_NO_HZ_COMMON) && base->nohz_active) -+ __run_timers(this_cpu_ptr(&timer_bases[BASE_DEF])); - } - - /* -@@ -1442,7 +1694,18 @@ static void run_timer_softirq(struct softirq_action *h) - */ - void run_local_timers(void) - { -+ struct timer_base *base = this_cpu_ptr(&timer_bases[BASE_STD]); -+ - hrtimer_run_queues(); -+ /* Raise the softirq only if required. */ -+ if (time_before(jiffies, base->clk)) { -+ if (!IS_ENABLED(CONFIG_NO_HZ_COMMON) || !base->nohz_active) -+ return; -+ /* CPU is awake, so check the deferrable base. */ -+ base++; -+ if (time_before(jiffies, base->clk)) -+ return; -+ } - raise_softirq(TIMER_SOFTIRQ); - } - -@@ -1527,7 +1790,7 @@ signed long __sched schedule_timeout(signed long timeout) - expire = timeout + jiffies; - - setup_timer_on_stack(&timer, process_timeout, (unsigned long)current); -- __mod_timer(&timer, expire, false, TIMER_NOT_PINNED); -+ __mod_timer(&timer, expire, false); - schedule(); - del_singleshot_timer_sync(&timer); - -@@ -1578,14 +1841,13 @@ signed long __sched schedule_timeout_idle(signed long timeout) - EXPORT_SYMBOL(schedule_timeout_idle); - - #ifdef CONFIG_HOTPLUG_CPU --static void migrate_timer_list(struct tvec_base *new_base, struct hlist_head *head) -+static void migrate_timer_list(struct timer_base *new_base, struct hlist_head *head) - { - struct timer_list *timer; - int cpu = new_base->cpu; - - while (!hlist_empty(head)) { - timer = hlist_entry(head->first, struct timer_list, entry); -- /* We ignore the accounting on the dying cpu */ - detach_timer(timer, false); - timer->flags = (timer->flags & ~TIMER_BASEMASK) | cpu; - internal_add_timer(new_base, timer); -@@ -1594,37 +1856,31 @@ static void migrate_timer_list(struct tvec_base *new_base, struct hlist_head *he - - static void migrate_timers(int cpu) - { -- struct tvec_base *old_base; -- struct tvec_base *new_base; -- int i; -+ struct timer_base *old_base; -+ struct timer_base *new_base; -+ int b, i; - - BUG_ON(cpu_online(cpu)); -- old_base = per_cpu_ptr(&tvec_bases, cpu); -- new_base = get_cpu_ptr(&tvec_bases); -- /* -- * The caller is globally serialized and nobody else -- * takes two locks at once, deadlock is not possible. -- */ -- spin_lock_irq(&new_base->lock); -- spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING); - -- BUG_ON(old_base->running_timer); -+ for (b = 0; b < NR_BASES; b++) { -+ old_base = per_cpu_ptr(&timer_bases[b], cpu); -+ new_base = get_cpu_ptr(&timer_bases[b]); -+ /* -+ * The caller is globally serialized and nobody else -+ * takes two locks at once, deadlock is not possible. -+ */ -+ raw_spin_lock_irq(&new_base->lock); -+ raw_spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING); - -- for (i = 0; i < TVR_SIZE; i++) -- migrate_timer_list(new_base, old_base->tv1.vec + i); -- for (i = 0; i < TVN_SIZE; i++) { -- migrate_timer_list(new_base, old_base->tv2.vec + i); -- migrate_timer_list(new_base, old_base->tv3.vec + i); -- migrate_timer_list(new_base, old_base->tv4.vec + i); -- migrate_timer_list(new_base, old_base->tv5.vec + i); -+ BUG_ON(old_base->running_timer); -+ -+ for (i = 0; i < WHEEL_SIZE; i++) -+ migrate_timer_list(new_base, old_base->vectors + i); -+ -+ raw_spin_unlock(&old_base->lock); -+ raw_spin_unlock_irq(&new_base->lock); -+ put_cpu_ptr(&timer_bases); - } -- -- old_base->active_timers = 0; -- old_base->all_timers = 0; -- -- spin_unlock(&old_base->lock); -- spin_unlock_irq(&new_base->lock); -- put_cpu_ptr(&tvec_bases); - } - - static int timer_cpu_notify(struct notifier_block *self, -@@ -1652,13 +1908,18 @@ static inline void timer_register_cpu_notifier(void) { } - - static void __init init_timer_cpu(int cpu) - { -- struct tvec_base *base = per_cpu_ptr(&tvec_bases, cpu); -+ struct timer_base *base; -+ int i; - -- base->cpu = cpu; -- spin_lock_init(&base->lock); -- -- base->timer_jiffies = jiffies; -- base->next_timer = base->timer_jiffies; -+ for (i = 0; i < NR_BASES; i++) { -+ base = per_cpu_ptr(&timer_bases[i], cpu); -+ base->cpu = cpu; -+ raw_spin_lock_init(&base->lock); -+ base->clk = jiffies; -+#ifdef CONFIG_PREEMPT_RT_FULL -+ init_swait_queue_head(&base->wait_for_running_timer); -+#endif -+ } - } - - static void __init init_timer_cpus(void) -diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig -index e45db6b0d878..364ccd0eb57b 100644 ---- a/kernel/trace/Kconfig -+++ b/kernel/trace/Kconfig -@@ -187,6 +187,24 @@ config IRQSOFF_TRACER - enabled. This option and the preempt-off timing option can be - used together or separately.) - -+config INTERRUPT_OFF_HIST -+ bool "Interrupts-off Latency Histogram" -+ depends on IRQSOFF_TRACER -+ help -+ This option generates continuously updated histograms (one per cpu) -+ of the duration of time periods with interrupts disabled. The -+ histograms are disabled by default. To enable them, write a non-zero -+ number to -+ -+ /sys/kernel/debug/tracing/latency_hist/enable/preemptirqsoff -+ -+ If PREEMPT_OFF_HIST is also selected, additional histograms (one -+ per cpu) are generated that accumulate the duration of time periods -+ when both interrupts and preemption are disabled. The histogram data -+ will be located in the debug file system at -+ -+ /sys/kernel/debug/tracing/latency_hist/irqsoff -+ - config PREEMPT_TRACER - bool "Preemption-off Latency Tracer" - default n -@@ -211,6 +229,24 @@ config PREEMPT_TRACER - enabled. This option and the irqs-off timing option can be - used together or separately.) - -+config PREEMPT_OFF_HIST -+ bool "Preemption-off Latency Histogram" -+ depends on PREEMPT_TRACER -+ help -+ This option generates continuously updated histograms (one per cpu) -+ of the duration of time periods with preemption disabled. The -+ histograms are disabled by default. To enable them, write a non-zero -+ number to -+ -+ /sys/kernel/debug/tracing/latency_hist/enable/preemptirqsoff -+ -+ If INTERRUPT_OFF_HIST is also selected, additional histograms (one -+ per cpu) are generated that accumulate the duration of time periods -+ when both interrupts and preemption are disabled. The histogram data -+ will be located in the debug file system at -+ -+ /sys/kernel/debug/tracing/latency_hist/preemptoff -+ - config SCHED_TRACER - bool "Scheduling Latency Tracer" - select GENERIC_TRACER -@@ -221,6 +257,74 @@ config SCHED_TRACER - This tracer tracks the latency of the highest priority task - to be scheduled in, starting from the point it has woken up. - -+config WAKEUP_LATENCY_HIST -+ bool "Scheduling Latency Histogram" -+ depends on SCHED_TRACER -+ help -+ This option generates continuously updated histograms (one per cpu) -+ of the scheduling latency of the highest priority task. -+ The histograms are disabled by default. To enable them, write a -+ non-zero number to -+ -+ /sys/kernel/debug/tracing/latency_hist/enable/wakeup -+ -+ Two different algorithms are used, one to determine the latency of -+ processes that exclusively use the highest priority of the system and -+ another one to determine the latency of processes that share the -+ highest system priority with other processes. The former is used to -+ improve hardware and system software, the latter to optimize the -+ priority design of a given system. The histogram data will be -+ located in the debug file system at -+ -+ /sys/kernel/debug/tracing/latency_hist/wakeup -+ -+ and -+ -+ /sys/kernel/debug/tracing/latency_hist/wakeup/sharedprio -+ -+ If both Scheduling Latency Histogram and Missed Timer Offsets -+ Histogram are selected, additional histogram data will be collected -+ that contain, in addition to the wakeup latency, the timer latency, in -+ case the wakeup was triggered by an expired timer. These histograms -+ are available in the -+ -+ /sys/kernel/debug/tracing/latency_hist/timerandwakeup -+ -+ directory. They reflect the apparent interrupt and scheduling latency -+ and are best suitable to determine the worst-case latency of a given -+ system. To enable these histograms, write a non-zero number to -+ -+ /sys/kernel/debug/tracing/latency_hist/enable/timerandwakeup -+ -+config MISSED_TIMER_OFFSETS_HIST -+ depends on HIGH_RES_TIMERS -+ select GENERIC_TRACER -+ bool "Missed Timer Offsets Histogram" -+ help -+ Generate a histogram of missed timer offsets in microseconds. The -+ histograms are disabled by default. To enable them, write a non-zero -+ number to -+ -+ /sys/kernel/debug/tracing/latency_hist/enable/missed_timer_offsets -+ -+ The histogram data will be located in the debug file system at -+ -+ /sys/kernel/debug/tracing/latency_hist/missed_timer_offsets -+ -+ If both Scheduling Latency Histogram and Missed Timer Offsets -+ Histogram are selected, additional histogram data will be collected -+ that contain, in addition to the wakeup latency, the timer latency, in -+ case the wakeup was triggered by an expired timer. These histograms -+ are available in the -+ -+ /sys/kernel/debug/tracing/latency_hist/timerandwakeup -+ -+ directory. They reflect the apparent interrupt and scheduling latency -+ and are best suitable to determine the worst-case latency of a given -+ system. To enable these histograms, write a non-zero number to -+ -+ /sys/kernel/debug/tracing/latency_hist/enable/timerandwakeup -+ - config ENABLE_DEFAULT_TRACERS - bool "Trace process context switches and events" - depends on !GENERIC_TRACER -diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile -index 9b1044e936a6..3bbaea06824a 100644 ---- a/kernel/trace/Makefile -+++ b/kernel/trace/Makefile -@@ -36,6 +36,10 @@ obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o - obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o - obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o - obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o -+obj-$(CONFIG_INTERRUPT_OFF_HIST) += latency_hist.o -+obj-$(CONFIG_PREEMPT_OFF_HIST) += latency_hist.o -+obj-$(CONFIG_WAKEUP_LATENCY_HIST) += latency_hist.o -+obj-$(CONFIG_MISSED_TIMER_OFFSETS_HIST) += latency_hist.o - obj-$(CONFIG_NOP_TRACER) += trace_nop.o - obj-$(CONFIG_STACK_TRACER) += trace_stack.o - obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o -diff --git a/kernel/trace/latency_hist.c b/kernel/trace/latency_hist.c -new file mode 100644 -index 000000000000..7f6ee70dea41 ---- /dev/null -+++ b/kernel/trace/latency_hist.c -@@ -0,0 +1,1178 @@ -+/* -+ * kernel/trace/latency_hist.c -+ * -+ * Add support for histograms of preemption-off latency and -+ * interrupt-off latency and wakeup latency, it depends on -+ * Real-Time Preemption Support. -+ * -+ * Copyright (C) 2005 MontaVista Software, Inc. -+ * Yi Yang <yyang@ch.mvista.com> -+ * -+ * Converted to work with the new latency tracer. -+ * Copyright (C) 2008 Red Hat, Inc. -+ * Steven Rostedt <srostedt@redhat.com> -+ * -+ */ -+#include <linux/module.h> -+#include <linux/debugfs.h> -+#include <linux/seq_file.h> -+#include <linux/percpu.h> -+#include <linux/kallsyms.h> -+#include <linux/uaccess.h> -+#include <linux/sched.h> -+#include <linux/sched/rt.h> -+#include <linux/slab.h> -+#include <linux/atomic.h> -+#include <asm/div64.h> -+ -+#include "trace.h" -+#include <trace/events/sched.h> -+ -+#define NSECS_PER_USECS 1000L -+ -+#define CREATE_TRACE_POINTS -+#include <trace/events/hist.h> -+ -+enum { -+ IRQSOFF_LATENCY = 0, -+ PREEMPTOFF_LATENCY, -+ PREEMPTIRQSOFF_LATENCY, -+ WAKEUP_LATENCY, -+ WAKEUP_LATENCY_SHAREDPRIO, -+ MISSED_TIMER_OFFSETS, -+ TIMERANDWAKEUP_LATENCY, -+ MAX_LATENCY_TYPE, -+}; -+ -+#define MAX_ENTRY_NUM 10240 -+ -+struct hist_data { -+ atomic_t hist_mode; /* 0 log, 1 don't log */ -+ long offset; /* set it to MAX_ENTRY_NUM/2 for a bipolar scale */ -+ long min_lat; -+ long max_lat; -+ unsigned long long below_hist_bound_samples; -+ unsigned long long above_hist_bound_samples; -+ long long accumulate_lat; -+ unsigned long long total_samples; -+ unsigned long long hist_array[MAX_ENTRY_NUM]; -+}; -+ -+struct enable_data { -+ int latency_type; -+ int enabled; -+}; -+ -+static char *latency_hist_dir_root = "latency_hist"; -+ -+#ifdef CONFIG_INTERRUPT_OFF_HIST -+static DEFINE_PER_CPU(struct hist_data, irqsoff_hist); -+static char *irqsoff_hist_dir = "irqsoff"; -+static DEFINE_PER_CPU(cycles_t, hist_irqsoff_start); -+static DEFINE_PER_CPU(int, hist_irqsoff_counting); -+#endif -+ -+#ifdef CONFIG_PREEMPT_OFF_HIST -+static DEFINE_PER_CPU(struct hist_data, preemptoff_hist); -+static char *preemptoff_hist_dir = "preemptoff"; -+static DEFINE_PER_CPU(cycles_t, hist_preemptoff_start); -+static DEFINE_PER_CPU(int, hist_preemptoff_counting); -+#endif -+ -+#if defined(CONFIG_PREEMPT_OFF_HIST) && defined(CONFIG_INTERRUPT_OFF_HIST) -+static DEFINE_PER_CPU(struct hist_data, preemptirqsoff_hist); -+static char *preemptirqsoff_hist_dir = "preemptirqsoff"; -+static DEFINE_PER_CPU(cycles_t, hist_preemptirqsoff_start); -+static DEFINE_PER_CPU(int, hist_preemptirqsoff_counting); -+#endif -+ -+#if defined(CONFIG_PREEMPT_OFF_HIST) || defined(CONFIG_INTERRUPT_OFF_HIST) -+static notrace void probe_preemptirqsoff_hist(void *v, int reason, int start); -+static struct enable_data preemptirqsoff_enabled_data = { -+ .latency_type = PREEMPTIRQSOFF_LATENCY, -+ .enabled = 0, -+}; -+#endif -+ -+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \ -+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST) -+struct maxlatproc_data { -+ char comm[FIELD_SIZEOF(struct task_struct, comm)]; -+ char current_comm[FIELD_SIZEOF(struct task_struct, comm)]; -+ int pid; -+ int current_pid; -+ int prio; -+ int current_prio; -+ long latency; -+ long timeroffset; -+ cycle_t timestamp; -+}; -+#endif -+ -+#ifdef CONFIG_WAKEUP_LATENCY_HIST -+static DEFINE_PER_CPU(struct hist_data, wakeup_latency_hist); -+static DEFINE_PER_CPU(struct hist_data, wakeup_latency_hist_sharedprio); -+static char *wakeup_latency_hist_dir = "wakeup"; -+static char *wakeup_latency_hist_dir_sharedprio = "sharedprio"; -+static notrace void probe_wakeup_latency_hist_start(void *v, -+ struct task_struct *p); -+static notrace void probe_wakeup_latency_hist_stop(void *v, -+ bool preempt, struct task_struct *prev, struct task_struct *next); -+static notrace void probe_sched_migrate_task(void *, -+ struct task_struct *task, int cpu); -+static struct enable_data wakeup_latency_enabled_data = { -+ .latency_type = WAKEUP_LATENCY, -+ .enabled = 0, -+}; -+static DEFINE_PER_CPU(struct maxlatproc_data, wakeup_maxlatproc); -+static DEFINE_PER_CPU(struct maxlatproc_data, wakeup_maxlatproc_sharedprio); -+static DEFINE_PER_CPU(struct task_struct *, wakeup_task); -+static DEFINE_PER_CPU(int, wakeup_sharedprio); -+static unsigned long wakeup_pid; -+#endif -+ -+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST -+static DEFINE_PER_CPU(struct hist_data, missed_timer_offsets); -+static char *missed_timer_offsets_dir = "missed_timer_offsets"; -+static notrace void probe_hrtimer_interrupt(void *v, int cpu, -+ long long offset, struct task_struct *curr, struct task_struct *task); -+static struct enable_data missed_timer_offsets_enabled_data = { -+ .latency_type = MISSED_TIMER_OFFSETS, -+ .enabled = 0, -+}; -+static DEFINE_PER_CPU(struct maxlatproc_data, missed_timer_offsets_maxlatproc); -+static unsigned long missed_timer_offsets_pid; -+#endif -+ -+#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \ -+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST) -+static DEFINE_PER_CPU(struct hist_data, timerandwakeup_latency_hist); -+static char *timerandwakeup_latency_hist_dir = "timerandwakeup"; -+static struct enable_data timerandwakeup_enabled_data = { -+ .latency_type = TIMERANDWAKEUP_LATENCY, -+ .enabled = 0, -+}; -+static DEFINE_PER_CPU(struct maxlatproc_data, timerandwakeup_maxlatproc); -+#endif -+ -+void notrace latency_hist(int latency_type, int cpu, long latency, -+ long timeroffset, cycle_t stop, -+ struct task_struct *p) -+{ -+ struct hist_data *my_hist; -+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \ -+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST) -+ struct maxlatproc_data *mp = NULL; -+#endif -+ -+ if (!cpu_possible(cpu) || latency_type < 0 || -+ latency_type >= MAX_LATENCY_TYPE) -+ return; -+ -+ switch (latency_type) { -+#ifdef CONFIG_INTERRUPT_OFF_HIST -+ case IRQSOFF_LATENCY: -+ my_hist = &per_cpu(irqsoff_hist, cpu); -+ break; -+#endif -+#ifdef CONFIG_PREEMPT_OFF_HIST -+ case PREEMPTOFF_LATENCY: -+ my_hist = &per_cpu(preemptoff_hist, cpu); -+ break; -+#endif -+#if defined(CONFIG_PREEMPT_OFF_HIST) && defined(CONFIG_INTERRUPT_OFF_HIST) -+ case PREEMPTIRQSOFF_LATENCY: -+ my_hist = &per_cpu(preemptirqsoff_hist, cpu); -+ break; -+#endif -+#ifdef CONFIG_WAKEUP_LATENCY_HIST -+ case WAKEUP_LATENCY: -+ my_hist = &per_cpu(wakeup_latency_hist, cpu); -+ mp = &per_cpu(wakeup_maxlatproc, cpu); -+ break; -+ case WAKEUP_LATENCY_SHAREDPRIO: -+ my_hist = &per_cpu(wakeup_latency_hist_sharedprio, cpu); -+ mp = &per_cpu(wakeup_maxlatproc_sharedprio, cpu); -+ break; -+#endif -+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST -+ case MISSED_TIMER_OFFSETS: -+ my_hist = &per_cpu(missed_timer_offsets, cpu); -+ mp = &per_cpu(missed_timer_offsets_maxlatproc, cpu); -+ break; -+#endif -+#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \ -+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST) -+ case TIMERANDWAKEUP_LATENCY: -+ my_hist = &per_cpu(timerandwakeup_latency_hist, cpu); -+ mp = &per_cpu(timerandwakeup_maxlatproc, cpu); -+ break; -+#endif -+ -+ default: -+ return; -+ } -+ -+ latency += my_hist->offset; -+ -+ if (atomic_read(&my_hist->hist_mode) == 0) -+ return; -+ -+ if (latency < 0 || latency >= MAX_ENTRY_NUM) { -+ if (latency < 0) -+ my_hist->below_hist_bound_samples++; -+ else -+ my_hist->above_hist_bound_samples++; -+ } else -+ my_hist->hist_array[latency]++; -+ -+ if (unlikely(latency > my_hist->max_lat || -+ my_hist->min_lat == LONG_MAX)) { -+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \ -+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST) -+ if (latency_type == WAKEUP_LATENCY || -+ latency_type == WAKEUP_LATENCY_SHAREDPRIO || -+ latency_type == MISSED_TIMER_OFFSETS || -+ latency_type == TIMERANDWAKEUP_LATENCY) { -+ strncpy(mp->comm, p->comm, sizeof(mp->comm)); -+ strncpy(mp->current_comm, current->comm, -+ sizeof(mp->current_comm)); -+ mp->pid = task_pid_nr(p); -+ mp->current_pid = task_pid_nr(current); -+ mp->prio = p->prio; -+ mp->current_prio = current->prio; -+ mp->latency = latency; -+ mp->timeroffset = timeroffset; -+ mp->timestamp = stop; -+ } -+#endif -+ my_hist->max_lat = latency; -+ } -+ if (unlikely(latency < my_hist->min_lat)) -+ my_hist->min_lat = latency; -+ my_hist->total_samples++; -+ my_hist->accumulate_lat += latency; -+} -+ -+static void *l_start(struct seq_file *m, loff_t *pos) -+{ -+ loff_t *index_ptr = NULL; -+ loff_t index = *pos; -+ struct hist_data *my_hist = m->private; -+ -+ if (index == 0) { -+ char minstr[32], avgstr[32], maxstr[32]; -+ -+ atomic_dec(&my_hist->hist_mode); -+ -+ if (likely(my_hist->total_samples)) { -+ long avg = (long) div64_s64(my_hist->accumulate_lat, -+ my_hist->total_samples); -+ snprintf(minstr, sizeof(minstr), "%ld", -+ my_hist->min_lat - my_hist->offset); -+ snprintf(avgstr, sizeof(avgstr), "%ld", -+ avg - my_hist->offset); -+ snprintf(maxstr, sizeof(maxstr), "%ld", -+ my_hist->max_lat - my_hist->offset); -+ } else { -+ strcpy(minstr, "<undef>"); -+ strcpy(avgstr, minstr); -+ strcpy(maxstr, minstr); -+ } -+ -+ seq_printf(m, "#Minimum latency: %s microseconds\n" -+ "#Average latency: %s microseconds\n" -+ "#Maximum latency: %s microseconds\n" -+ "#Total samples: %llu\n" -+ "#There are %llu samples lower than %ld" -+ " microseconds.\n" -+ "#There are %llu samples greater or equal" -+ " than %ld microseconds.\n" -+ "#usecs\t%16s\n", -+ minstr, avgstr, maxstr, -+ my_hist->total_samples, -+ my_hist->below_hist_bound_samples, -+ -my_hist->offset, -+ my_hist->above_hist_bound_samples, -+ MAX_ENTRY_NUM - my_hist->offset, -+ "samples"); -+ } -+ if (index < MAX_ENTRY_NUM) { -+ index_ptr = kmalloc(sizeof(loff_t), GFP_KERNEL); -+ if (index_ptr) -+ *index_ptr = index; -+ } -+ -+ return index_ptr; -+} -+ -+static void *l_next(struct seq_file *m, void *p, loff_t *pos) -+{ -+ loff_t *index_ptr = p; -+ struct hist_data *my_hist = m->private; -+ -+ if (++*pos >= MAX_ENTRY_NUM) { -+ atomic_inc(&my_hist->hist_mode); -+ return NULL; -+ } -+ *index_ptr = *pos; -+ return index_ptr; -+} -+ -+static void l_stop(struct seq_file *m, void *p) -+{ -+ kfree(p); -+} -+ -+static int l_show(struct seq_file *m, void *p) -+{ -+ int index = *(loff_t *) p; -+ struct hist_data *my_hist = m->private; -+ -+ seq_printf(m, "%6ld\t%16llu\n", index - my_hist->offset, -+ my_hist->hist_array[index]); -+ return 0; -+} -+ -+static const struct seq_operations latency_hist_seq_op = { -+ .start = l_start, -+ .next = l_next, -+ .stop = l_stop, -+ .show = l_show -+}; -+ -+static int latency_hist_open(struct inode *inode, struct file *file) -+{ -+ int ret; -+ -+ ret = seq_open(file, &latency_hist_seq_op); -+ if (!ret) { -+ struct seq_file *seq = file->private_data; -+ seq->private = inode->i_private; -+ } -+ return ret; -+} -+ -+static const struct file_operations latency_hist_fops = { -+ .open = latency_hist_open, -+ .read = seq_read, -+ .llseek = seq_lseek, -+ .release = seq_release, -+}; -+ -+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \ -+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST) -+static void clear_maxlatprocdata(struct maxlatproc_data *mp) -+{ -+ mp->comm[0] = mp->current_comm[0] = '\0'; -+ mp->prio = mp->current_prio = mp->pid = mp->current_pid = -+ mp->latency = mp->timeroffset = -1; -+ mp->timestamp = 0; -+} -+#endif -+ -+static void hist_reset(struct hist_data *hist) -+{ -+ atomic_dec(&hist->hist_mode); -+ -+ memset(hist->hist_array, 0, sizeof(hist->hist_array)); -+ hist->below_hist_bound_samples = 0ULL; -+ hist->above_hist_bound_samples = 0ULL; -+ hist->min_lat = LONG_MAX; -+ hist->max_lat = LONG_MIN; -+ hist->total_samples = 0ULL; -+ hist->accumulate_lat = 0LL; -+ -+ atomic_inc(&hist->hist_mode); -+} -+ -+static ssize_t -+latency_hist_reset(struct file *file, const char __user *a, -+ size_t size, loff_t *off) -+{ -+ int cpu; -+ struct hist_data *hist = NULL; -+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \ -+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST) -+ struct maxlatproc_data *mp = NULL; -+#endif -+ off_t latency_type = (off_t) file->private_data; -+ -+ for_each_online_cpu(cpu) { -+ -+ switch (latency_type) { -+#ifdef CONFIG_PREEMPT_OFF_HIST -+ case PREEMPTOFF_LATENCY: -+ hist = &per_cpu(preemptoff_hist, cpu); -+ break; -+#endif -+#ifdef CONFIG_INTERRUPT_OFF_HIST -+ case IRQSOFF_LATENCY: -+ hist = &per_cpu(irqsoff_hist, cpu); -+ break; -+#endif -+#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST) -+ case PREEMPTIRQSOFF_LATENCY: -+ hist = &per_cpu(preemptirqsoff_hist, cpu); -+ break; -+#endif -+#ifdef CONFIG_WAKEUP_LATENCY_HIST -+ case WAKEUP_LATENCY: -+ hist = &per_cpu(wakeup_latency_hist, cpu); -+ mp = &per_cpu(wakeup_maxlatproc, cpu); -+ break; -+ case WAKEUP_LATENCY_SHAREDPRIO: -+ hist = &per_cpu(wakeup_latency_hist_sharedprio, cpu); -+ mp = &per_cpu(wakeup_maxlatproc_sharedprio, cpu); -+ break; -+#endif -+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST -+ case MISSED_TIMER_OFFSETS: -+ hist = &per_cpu(missed_timer_offsets, cpu); -+ mp = &per_cpu(missed_timer_offsets_maxlatproc, cpu); -+ break; -+#endif -+#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \ -+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST) -+ case TIMERANDWAKEUP_LATENCY: -+ hist = &per_cpu(timerandwakeup_latency_hist, cpu); -+ mp = &per_cpu(timerandwakeup_maxlatproc, cpu); -+ break; -+#endif -+ } -+ -+ hist_reset(hist); -+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \ -+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST) -+ if (latency_type == WAKEUP_LATENCY || -+ latency_type == WAKEUP_LATENCY_SHAREDPRIO || -+ latency_type == MISSED_TIMER_OFFSETS || -+ latency_type == TIMERANDWAKEUP_LATENCY) -+ clear_maxlatprocdata(mp); -+#endif -+ } -+ -+ return size; -+} -+ -+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \ -+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST) -+static ssize_t -+show_pid(struct file *file, char __user *ubuf, size_t cnt, loff_t *ppos) -+{ -+ char buf[64]; -+ int r; -+ unsigned long *this_pid = file->private_data; -+ -+ r = snprintf(buf, sizeof(buf), "%lu\n", *this_pid); -+ return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); -+} -+ -+static ssize_t do_pid(struct file *file, const char __user *ubuf, -+ size_t cnt, loff_t *ppos) -+{ -+ char buf[64]; -+ unsigned long pid; -+ unsigned long *this_pid = file->private_data; -+ -+ if (cnt >= sizeof(buf)) -+ return -EINVAL; -+ -+ if (copy_from_user(&buf, ubuf, cnt)) -+ return -EFAULT; -+ -+ buf[cnt] = '\0'; -+ -+ if (kstrtoul(buf, 10, &pid)) -+ return -EINVAL; -+ -+ *this_pid = pid; -+ -+ return cnt; -+} -+#endif -+ -+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \ -+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST) -+static ssize_t -+show_maxlatproc(struct file *file, char __user *ubuf, size_t cnt, loff_t *ppos) -+{ -+ int r; -+ struct maxlatproc_data *mp = file->private_data; -+ int strmaxlen = (TASK_COMM_LEN * 2) + (8 * 8); -+ unsigned long long t; -+ unsigned long usecs, secs; -+ char *buf; -+ -+ if (mp->pid == -1 || mp->current_pid == -1) { -+ buf = "(none)\n"; -+ return simple_read_from_buffer(ubuf, cnt, ppos, buf, -+ strlen(buf)); -+ } -+ -+ buf = kmalloc(strmaxlen, GFP_KERNEL); -+ if (buf == NULL) -+ return -ENOMEM; -+ -+ t = ns2usecs(mp->timestamp); -+ usecs = do_div(t, USEC_PER_SEC); -+ secs = (unsigned long) t; -+ r = snprintf(buf, strmaxlen, -+ "%d %d %ld (%ld) %s <- %d %d %s %lu.%06lu\n", mp->pid, -+ MAX_RT_PRIO-1 - mp->prio, mp->latency, mp->timeroffset, mp->comm, -+ mp->current_pid, MAX_RT_PRIO-1 - mp->current_prio, mp->current_comm, -+ secs, usecs); -+ r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); -+ kfree(buf); -+ return r; -+} -+#endif -+ -+static ssize_t -+show_enable(struct file *file, char __user *ubuf, size_t cnt, loff_t *ppos) -+{ -+ char buf[64]; -+ struct enable_data *ed = file->private_data; -+ int r; -+ -+ r = snprintf(buf, sizeof(buf), "%d\n", ed->enabled); -+ return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); -+} -+ -+static ssize_t -+do_enable(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos) -+{ -+ char buf[64]; -+ long enable; -+ struct enable_data *ed = file->private_data; -+ -+ if (cnt >= sizeof(buf)) -+ return -EINVAL; -+ -+ if (copy_from_user(&buf, ubuf, cnt)) -+ return -EFAULT; -+ -+ buf[cnt] = 0; -+ -+ if (kstrtoul(buf, 10, &enable)) -+ return -EINVAL; -+ -+ if ((enable && ed->enabled) || (!enable && !ed->enabled)) -+ return cnt; -+ -+ if (enable) { -+ int ret; -+ -+ switch (ed->latency_type) { -+#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST) -+ case PREEMPTIRQSOFF_LATENCY: -+ ret = register_trace_preemptirqsoff_hist( -+ probe_preemptirqsoff_hist, NULL); -+ if (ret) { -+ pr_info("wakeup trace: Couldn't assign " -+ "probe_preemptirqsoff_hist " -+ "to trace_preemptirqsoff_hist\n"); -+ return ret; -+ } -+ break; -+#endif -+#ifdef CONFIG_WAKEUP_LATENCY_HIST -+ case WAKEUP_LATENCY: -+ ret = register_trace_sched_wakeup( -+ probe_wakeup_latency_hist_start, NULL); -+ if (ret) { -+ pr_info("wakeup trace: Couldn't assign " -+ "probe_wakeup_latency_hist_start " -+ "to trace_sched_wakeup\n"); -+ return ret; -+ } -+ ret = register_trace_sched_wakeup_new( -+ probe_wakeup_latency_hist_start, NULL); -+ if (ret) { -+ pr_info("wakeup trace: Couldn't assign " -+ "probe_wakeup_latency_hist_start " -+ "to trace_sched_wakeup_new\n"); -+ unregister_trace_sched_wakeup( -+ probe_wakeup_latency_hist_start, NULL); -+ return ret; -+ } -+ ret = register_trace_sched_switch( -+ probe_wakeup_latency_hist_stop, NULL); -+ if (ret) { -+ pr_info("wakeup trace: Couldn't assign " -+ "probe_wakeup_latency_hist_stop " -+ "to trace_sched_switch\n"); -+ unregister_trace_sched_wakeup( -+ probe_wakeup_latency_hist_start, NULL); -+ unregister_trace_sched_wakeup_new( -+ probe_wakeup_latency_hist_start, NULL); -+ return ret; -+ } -+ ret = register_trace_sched_migrate_task( -+ probe_sched_migrate_task, NULL); -+ if (ret) { -+ pr_info("wakeup trace: Couldn't assign " -+ "probe_sched_migrate_task " -+ "to trace_sched_migrate_task\n"); -+ unregister_trace_sched_wakeup( -+ probe_wakeup_latency_hist_start, NULL); -+ unregister_trace_sched_wakeup_new( -+ probe_wakeup_latency_hist_start, NULL); -+ unregister_trace_sched_switch( -+ probe_wakeup_latency_hist_stop, NULL); -+ return ret; -+ } -+ break; -+#endif -+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST -+ case MISSED_TIMER_OFFSETS: -+ ret = register_trace_hrtimer_interrupt( -+ probe_hrtimer_interrupt, NULL); -+ if (ret) { -+ pr_info("wakeup trace: Couldn't assign " -+ "probe_hrtimer_interrupt " -+ "to trace_hrtimer_interrupt\n"); -+ return ret; -+ } -+ break; -+#endif -+#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \ -+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST) -+ case TIMERANDWAKEUP_LATENCY: -+ if (!wakeup_latency_enabled_data.enabled || -+ !missed_timer_offsets_enabled_data.enabled) -+ return -EINVAL; -+ break; -+#endif -+ default: -+ break; -+ } -+ } else { -+ switch (ed->latency_type) { -+#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST) -+ case PREEMPTIRQSOFF_LATENCY: -+ { -+ int cpu; -+ -+ unregister_trace_preemptirqsoff_hist( -+ probe_preemptirqsoff_hist, NULL); -+ for_each_online_cpu(cpu) { -+#ifdef CONFIG_INTERRUPT_OFF_HIST -+ per_cpu(hist_irqsoff_counting, -+ cpu) = 0; -+#endif -+#ifdef CONFIG_PREEMPT_OFF_HIST -+ per_cpu(hist_preemptoff_counting, -+ cpu) = 0; -+#endif -+#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST) -+ per_cpu(hist_preemptirqsoff_counting, -+ cpu) = 0; -+#endif -+ } -+ } -+ break; -+#endif -+#ifdef CONFIG_WAKEUP_LATENCY_HIST -+ case WAKEUP_LATENCY: -+ { -+ int cpu; -+ -+ unregister_trace_sched_wakeup( -+ probe_wakeup_latency_hist_start, NULL); -+ unregister_trace_sched_wakeup_new( -+ probe_wakeup_latency_hist_start, NULL); -+ unregister_trace_sched_switch( -+ probe_wakeup_latency_hist_stop, NULL); -+ unregister_trace_sched_migrate_task( -+ probe_sched_migrate_task, NULL); -+ -+ for_each_online_cpu(cpu) { -+ per_cpu(wakeup_task, cpu) = NULL; -+ per_cpu(wakeup_sharedprio, cpu) = 0; -+ } -+ } -+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST -+ timerandwakeup_enabled_data.enabled = 0; -+#endif -+ break; -+#endif -+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST -+ case MISSED_TIMER_OFFSETS: -+ unregister_trace_hrtimer_interrupt( -+ probe_hrtimer_interrupt, NULL); -+#ifdef CONFIG_WAKEUP_LATENCY_HIST -+ timerandwakeup_enabled_data.enabled = 0; -+#endif -+ break; -+#endif -+ default: -+ break; -+ } -+ } -+ ed->enabled = enable; -+ return cnt; -+} -+ -+static const struct file_operations latency_hist_reset_fops = { -+ .open = tracing_open_generic, -+ .write = latency_hist_reset, -+}; -+ -+static const struct file_operations enable_fops = { -+ .open = tracing_open_generic, -+ .read = show_enable, -+ .write = do_enable, -+}; -+ -+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \ -+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST) -+static const struct file_operations pid_fops = { -+ .open = tracing_open_generic, -+ .read = show_pid, -+ .write = do_pid, -+}; -+ -+static const struct file_operations maxlatproc_fops = { -+ .open = tracing_open_generic, -+ .read = show_maxlatproc, -+}; -+#endif -+ -+#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST) -+static notrace void probe_preemptirqsoff_hist(void *v, int reason, -+ int starthist) -+{ -+ int cpu = raw_smp_processor_id(); -+ int time_set = 0; -+ -+ if (starthist) { -+ cycle_t uninitialized_var(start); -+ -+ if (!preempt_count() && !irqs_disabled()) -+ return; -+ -+#ifdef CONFIG_INTERRUPT_OFF_HIST -+ if ((reason == IRQS_OFF || reason == TRACE_START) && -+ !per_cpu(hist_irqsoff_counting, cpu)) { -+ per_cpu(hist_irqsoff_counting, cpu) = 1; -+ start = ftrace_now(cpu); -+ time_set++; -+ per_cpu(hist_irqsoff_start, cpu) = start; -+ } -+#endif -+ -+#ifdef CONFIG_PREEMPT_OFF_HIST -+ if ((reason == PREEMPT_OFF || reason == TRACE_START) && -+ !per_cpu(hist_preemptoff_counting, cpu)) { -+ per_cpu(hist_preemptoff_counting, cpu) = 1; -+ if (!(time_set++)) -+ start = ftrace_now(cpu); -+ per_cpu(hist_preemptoff_start, cpu) = start; -+ } -+#endif -+ -+#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST) -+ if (per_cpu(hist_irqsoff_counting, cpu) && -+ per_cpu(hist_preemptoff_counting, cpu) && -+ !per_cpu(hist_preemptirqsoff_counting, cpu)) { -+ per_cpu(hist_preemptirqsoff_counting, cpu) = 1; -+ if (!time_set) -+ start = ftrace_now(cpu); -+ per_cpu(hist_preemptirqsoff_start, cpu) = start; -+ } -+#endif -+ } else { -+ cycle_t uninitialized_var(stop); -+ -+#ifdef CONFIG_INTERRUPT_OFF_HIST -+ if ((reason == IRQS_ON || reason == TRACE_STOP) && -+ per_cpu(hist_irqsoff_counting, cpu)) { -+ cycle_t start = per_cpu(hist_irqsoff_start, cpu); -+ -+ stop = ftrace_now(cpu); -+ time_set++; -+ if (start) { -+ long latency = ((long) (stop - start)) / -+ NSECS_PER_USECS; -+ -+ latency_hist(IRQSOFF_LATENCY, cpu, latency, 0, -+ stop, NULL); -+ } -+ per_cpu(hist_irqsoff_counting, cpu) = 0; -+ } -+#endif -+ -+#ifdef CONFIG_PREEMPT_OFF_HIST -+ if ((reason == PREEMPT_ON || reason == TRACE_STOP) && -+ per_cpu(hist_preemptoff_counting, cpu)) { -+ cycle_t start = per_cpu(hist_preemptoff_start, cpu); -+ -+ if (!(time_set++)) -+ stop = ftrace_now(cpu); -+ if (start) { -+ long latency = ((long) (stop - start)) / -+ NSECS_PER_USECS; -+ -+ latency_hist(PREEMPTOFF_LATENCY, cpu, latency, -+ 0, stop, NULL); -+ } -+ per_cpu(hist_preemptoff_counting, cpu) = 0; -+ } -+#endif -+ -+#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST) -+ if ((!per_cpu(hist_irqsoff_counting, cpu) || -+ !per_cpu(hist_preemptoff_counting, cpu)) && -+ per_cpu(hist_preemptirqsoff_counting, cpu)) { -+ cycle_t start = per_cpu(hist_preemptirqsoff_start, cpu); -+ -+ if (!time_set) -+ stop = ftrace_now(cpu); -+ if (start) { -+ long latency = ((long) (stop - start)) / -+ NSECS_PER_USECS; -+ -+ latency_hist(PREEMPTIRQSOFF_LATENCY, cpu, -+ latency, 0, stop, NULL); -+ } -+ per_cpu(hist_preemptirqsoff_counting, cpu) = 0; -+ } -+#endif -+ } -+} -+#endif -+ -+#ifdef CONFIG_WAKEUP_LATENCY_HIST -+static DEFINE_RAW_SPINLOCK(wakeup_lock); -+static notrace void probe_sched_migrate_task(void *v, struct task_struct *task, -+ int cpu) -+{ -+ int old_cpu = task_cpu(task); -+ -+ if (cpu != old_cpu) { -+ unsigned long flags; -+ struct task_struct *cpu_wakeup_task; -+ -+ raw_spin_lock_irqsave(&wakeup_lock, flags); -+ -+ cpu_wakeup_task = per_cpu(wakeup_task, old_cpu); -+ if (task == cpu_wakeup_task) { -+ put_task_struct(cpu_wakeup_task); -+ per_cpu(wakeup_task, old_cpu) = NULL; -+ cpu_wakeup_task = per_cpu(wakeup_task, cpu) = task; -+ get_task_struct(cpu_wakeup_task); -+ } -+ -+ raw_spin_unlock_irqrestore(&wakeup_lock, flags); -+ } -+} -+ -+static notrace void probe_wakeup_latency_hist_start(void *v, -+ struct task_struct *p) -+{ -+ unsigned long flags; -+ struct task_struct *curr = current; -+ int cpu = task_cpu(p); -+ struct task_struct *cpu_wakeup_task; -+ -+ raw_spin_lock_irqsave(&wakeup_lock, flags); -+ -+ cpu_wakeup_task = per_cpu(wakeup_task, cpu); -+ -+ if (wakeup_pid) { -+ if ((cpu_wakeup_task && p->prio == cpu_wakeup_task->prio) || -+ p->prio == curr->prio) -+ per_cpu(wakeup_sharedprio, cpu) = 1; -+ if (likely(wakeup_pid != task_pid_nr(p))) -+ goto out; -+ } else { -+ if (likely(!rt_task(p)) || -+ (cpu_wakeup_task && p->prio > cpu_wakeup_task->prio) || -+ p->prio > curr->prio) -+ goto out; -+ if ((cpu_wakeup_task && p->prio == cpu_wakeup_task->prio) || -+ p->prio == curr->prio) -+ per_cpu(wakeup_sharedprio, cpu) = 1; -+ } -+ -+ if (cpu_wakeup_task) -+ put_task_struct(cpu_wakeup_task); -+ cpu_wakeup_task = per_cpu(wakeup_task, cpu) = p; -+ get_task_struct(cpu_wakeup_task); -+ cpu_wakeup_task->preempt_timestamp_hist = -+ ftrace_now(raw_smp_processor_id()); -+out: -+ raw_spin_unlock_irqrestore(&wakeup_lock, flags); -+} -+ -+static notrace void probe_wakeup_latency_hist_stop(void *v, -+ bool preempt, struct task_struct *prev, struct task_struct *next) -+{ -+ unsigned long flags; -+ int cpu = task_cpu(next); -+ long latency; -+ cycle_t stop; -+ struct task_struct *cpu_wakeup_task; -+ -+ raw_spin_lock_irqsave(&wakeup_lock, flags); -+ -+ cpu_wakeup_task = per_cpu(wakeup_task, cpu); -+ -+ if (cpu_wakeup_task == NULL) -+ goto out; -+ -+ /* Already running? */ -+ if (unlikely(current == cpu_wakeup_task)) -+ goto out_reset; -+ -+ if (next != cpu_wakeup_task) { -+ if (next->prio < cpu_wakeup_task->prio) -+ goto out_reset; -+ -+ if (next->prio == cpu_wakeup_task->prio) -+ per_cpu(wakeup_sharedprio, cpu) = 1; -+ -+ goto out; -+ } -+ -+ if (current->prio == cpu_wakeup_task->prio) -+ per_cpu(wakeup_sharedprio, cpu) = 1; -+ -+ /* -+ * The task we are waiting for is about to be switched to. -+ * Calculate latency and store it in histogram. -+ */ -+ stop = ftrace_now(raw_smp_processor_id()); -+ -+ latency = ((long) (stop - next->preempt_timestamp_hist)) / -+ NSECS_PER_USECS; -+ -+ if (per_cpu(wakeup_sharedprio, cpu)) { -+ latency_hist(WAKEUP_LATENCY_SHAREDPRIO, cpu, latency, 0, stop, -+ next); -+ per_cpu(wakeup_sharedprio, cpu) = 0; -+ } else { -+ latency_hist(WAKEUP_LATENCY, cpu, latency, 0, stop, next); -+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST -+ if (timerandwakeup_enabled_data.enabled) { -+ latency_hist(TIMERANDWAKEUP_LATENCY, cpu, -+ next->timer_offset + latency, next->timer_offset, -+ stop, next); -+ } -+#endif -+ } -+ -+out_reset: -+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST -+ next->timer_offset = 0; -+#endif -+ put_task_struct(cpu_wakeup_task); -+ per_cpu(wakeup_task, cpu) = NULL; -+out: -+ raw_spin_unlock_irqrestore(&wakeup_lock, flags); -+} -+#endif -+ -+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST -+static notrace void probe_hrtimer_interrupt(void *v, int cpu, -+ long long latency_ns, struct task_struct *curr, -+ struct task_struct *task) -+{ -+ if (latency_ns <= 0 && task != NULL && rt_task(task) && -+ (task->prio < curr->prio || -+ (task->prio == curr->prio && -+ !cpumask_test_cpu(cpu, &task->cpus_allowed)))) { -+ long latency; -+ cycle_t now; -+ -+ if (missed_timer_offsets_pid) { -+ if (likely(missed_timer_offsets_pid != -+ task_pid_nr(task))) -+ return; -+ } -+ -+ now = ftrace_now(cpu); -+ latency = (long) div_s64(-latency_ns, NSECS_PER_USECS); -+ latency_hist(MISSED_TIMER_OFFSETS, cpu, latency, latency, now, -+ task); -+#ifdef CONFIG_WAKEUP_LATENCY_HIST -+ task->timer_offset = latency; -+#endif -+ } -+} -+#endif -+ -+static __init int latency_hist_init(void) -+{ -+ struct dentry *latency_hist_root = NULL; -+ struct dentry *dentry; -+#ifdef CONFIG_WAKEUP_LATENCY_HIST -+ struct dentry *dentry_sharedprio; -+#endif -+ struct dentry *entry; -+ struct dentry *enable_root; -+ int i = 0; -+ struct hist_data *my_hist; -+ char name[64]; -+ char *cpufmt = "CPU%d"; -+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \ -+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST) -+ char *cpufmt_maxlatproc = "max_latency-CPU%d"; -+ struct maxlatproc_data *mp = NULL; -+#endif -+ -+ dentry = tracing_init_dentry(); -+ latency_hist_root = debugfs_create_dir(latency_hist_dir_root, dentry); -+ enable_root = debugfs_create_dir("enable", latency_hist_root); -+ -+#ifdef CONFIG_INTERRUPT_OFF_HIST -+ dentry = debugfs_create_dir(irqsoff_hist_dir, latency_hist_root); -+ for_each_possible_cpu(i) { -+ sprintf(name, cpufmt, i); -+ entry = debugfs_create_file(name, 0444, dentry, -+ &per_cpu(irqsoff_hist, i), &latency_hist_fops); -+ my_hist = &per_cpu(irqsoff_hist, i); -+ atomic_set(&my_hist->hist_mode, 1); -+ my_hist->min_lat = LONG_MAX; -+ } -+ entry = debugfs_create_file("reset", 0644, dentry, -+ (void *)IRQSOFF_LATENCY, &latency_hist_reset_fops); -+#endif -+ -+#ifdef CONFIG_PREEMPT_OFF_HIST -+ dentry = debugfs_create_dir(preemptoff_hist_dir, -+ latency_hist_root); -+ for_each_possible_cpu(i) { -+ sprintf(name, cpufmt, i); -+ entry = debugfs_create_file(name, 0444, dentry, -+ &per_cpu(preemptoff_hist, i), &latency_hist_fops); -+ my_hist = &per_cpu(preemptoff_hist, i); -+ atomic_set(&my_hist->hist_mode, 1); -+ my_hist->min_lat = LONG_MAX; -+ } -+ entry = debugfs_create_file("reset", 0644, dentry, -+ (void *)PREEMPTOFF_LATENCY, &latency_hist_reset_fops); -+#endif -+ -+#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST) -+ dentry = debugfs_create_dir(preemptirqsoff_hist_dir, -+ latency_hist_root); -+ for_each_possible_cpu(i) { -+ sprintf(name, cpufmt, i); -+ entry = debugfs_create_file(name, 0444, dentry, -+ &per_cpu(preemptirqsoff_hist, i), &latency_hist_fops); -+ my_hist = &per_cpu(preemptirqsoff_hist, i); -+ atomic_set(&my_hist->hist_mode, 1); -+ my_hist->min_lat = LONG_MAX; -+ } -+ entry = debugfs_create_file("reset", 0644, dentry, -+ (void *)PREEMPTIRQSOFF_LATENCY, &latency_hist_reset_fops); -+#endif -+ -+#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST) -+ entry = debugfs_create_file("preemptirqsoff", 0644, -+ enable_root, (void *)&preemptirqsoff_enabled_data, -+ &enable_fops); -+#endif -+ -+#ifdef CONFIG_WAKEUP_LATENCY_HIST -+ dentry = debugfs_create_dir(wakeup_latency_hist_dir, -+ latency_hist_root); -+ dentry_sharedprio = debugfs_create_dir( -+ wakeup_latency_hist_dir_sharedprio, dentry); -+ for_each_possible_cpu(i) { -+ sprintf(name, cpufmt, i); -+ -+ entry = debugfs_create_file(name, 0444, dentry, -+ &per_cpu(wakeup_latency_hist, i), -+ &latency_hist_fops); -+ my_hist = &per_cpu(wakeup_latency_hist, i); -+ atomic_set(&my_hist->hist_mode, 1); -+ my_hist->min_lat = LONG_MAX; -+ -+ entry = debugfs_create_file(name, 0444, dentry_sharedprio, -+ &per_cpu(wakeup_latency_hist_sharedprio, i), -+ &latency_hist_fops); -+ my_hist = &per_cpu(wakeup_latency_hist_sharedprio, i); -+ atomic_set(&my_hist->hist_mode, 1); -+ my_hist->min_lat = LONG_MAX; -+ -+ sprintf(name, cpufmt_maxlatproc, i); -+ -+ mp = &per_cpu(wakeup_maxlatproc, i); -+ entry = debugfs_create_file(name, 0444, dentry, mp, -+ &maxlatproc_fops); -+ clear_maxlatprocdata(mp); -+ -+ mp = &per_cpu(wakeup_maxlatproc_sharedprio, i); -+ entry = debugfs_create_file(name, 0444, dentry_sharedprio, mp, -+ &maxlatproc_fops); -+ clear_maxlatprocdata(mp); -+ } -+ entry = debugfs_create_file("pid", 0644, dentry, -+ (void *)&wakeup_pid, &pid_fops); -+ entry = debugfs_create_file("reset", 0644, dentry, -+ (void *)WAKEUP_LATENCY, &latency_hist_reset_fops); -+ entry = debugfs_create_file("reset", 0644, dentry_sharedprio, -+ (void *)WAKEUP_LATENCY_SHAREDPRIO, &latency_hist_reset_fops); -+ entry = debugfs_create_file("wakeup", 0644, -+ enable_root, (void *)&wakeup_latency_enabled_data, -+ &enable_fops); -+#endif -+ -+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST -+ dentry = debugfs_create_dir(missed_timer_offsets_dir, -+ latency_hist_root); -+ for_each_possible_cpu(i) { -+ sprintf(name, cpufmt, i); -+ entry = debugfs_create_file(name, 0444, dentry, -+ &per_cpu(missed_timer_offsets, i), &latency_hist_fops); -+ my_hist = &per_cpu(missed_timer_offsets, i); -+ atomic_set(&my_hist->hist_mode, 1); -+ my_hist->min_lat = LONG_MAX; -+ -+ sprintf(name, cpufmt_maxlatproc, i); -+ mp = &per_cpu(missed_timer_offsets_maxlatproc, i); -+ entry = debugfs_create_file(name, 0444, dentry, mp, -+ &maxlatproc_fops); -+ clear_maxlatprocdata(mp); -+ } -+ entry = debugfs_create_file("pid", 0644, dentry, -+ (void *)&missed_timer_offsets_pid, &pid_fops); -+ entry = debugfs_create_file("reset", 0644, dentry, -+ (void *)MISSED_TIMER_OFFSETS, &latency_hist_reset_fops); -+ entry = debugfs_create_file("missed_timer_offsets", 0644, -+ enable_root, (void *)&missed_timer_offsets_enabled_data, -+ &enable_fops); -+#endif -+ -+#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \ -+ defined(CONFIG_MISSED_TIMER_OFFSETS_HIST) -+ dentry = debugfs_create_dir(timerandwakeup_latency_hist_dir, -+ latency_hist_root); -+ for_each_possible_cpu(i) { -+ sprintf(name, cpufmt, i); -+ entry = debugfs_create_file(name, 0444, dentry, -+ &per_cpu(timerandwakeup_latency_hist, i), -+ &latency_hist_fops); -+ my_hist = &per_cpu(timerandwakeup_latency_hist, i); -+ atomic_set(&my_hist->hist_mode, 1); -+ my_hist->min_lat = LONG_MAX; -+ -+ sprintf(name, cpufmt_maxlatproc, i); -+ mp = &per_cpu(timerandwakeup_maxlatproc, i); -+ entry = debugfs_create_file(name, 0444, dentry, mp, -+ &maxlatproc_fops); -+ clear_maxlatprocdata(mp); -+ } -+ entry = debugfs_create_file("reset", 0644, dentry, -+ (void *)TIMERANDWAKEUP_LATENCY, &latency_hist_reset_fops); -+ entry = debugfs_create_file("timerandwakeup", 0644, -+ enable_root, (void *)&timerandwakeup_enabled_data, -+ &enable_fops); -+#endif -+ return 0; -+} -+ -+device_initcall(latency_hist_init); -diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c -index a2f0b9f33e9b..3ffea48d795c 100644 ---- a/kernel/trace/trace.c -+++ b/kernel/trace/trace.c -@@ -1657,6 +1657,7 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, - struct task_struct *tsk = current; - - entry->preempt_count = pc & 0xff; -+ entry->preempt_lazy_count = preempt_lazy_count(); - entry->pid = (tsk) ? tsk->pid : 0; - entry->flags = - #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT -@@ -1667,8 +1668,11 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, - ((pc & NMI_MASK ) ? TRACE_FLAG_NMI : 0) | - ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | - ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | -- (tif_need_resched() ? TRACE_FLAG_NEED_RESCHED : 0) | -+ (tif_need_resched_now() ? TRACE_FLAG_NEED_RESCHED : 0) | -+ (need_resched_lazy() ? TRACE_FLAG_NEED_RESCHED_LAZY : 0) | - (test_preempt_need_resched() ? TRACE_FLAG_PREEMPT_RESCHED : 0); -+ -+ entry->migrate_disable = (tsk) ? __migrate_disabled(tsk) & 0xFF : 0; - } - EXPORT_SYMBOL_GPL(tracing_generic_entry_update); - -@@ -2561,14 +2565,17 @@ get_total_entries(struct trace_buffer *buf, - - static void print_lat_help_header(struct seq_file *m) - { -- seq_puts(m, "# _------=> CPU# \n" -- "# / _-----=> irqs-off \n" -- "# | / _----=> need-resched \n" -- "# || / _---=> hardirq/softirq \n" -- "# ||| / _--=> preempt-depth \n" -- "# |||| / delay \n" -- "# cmd pid ||||| time | caller \n" -- "# \\ / ||||| \\ | / \n"); -+ seq_puts(m, "# _--------=> CPU# \n" -+ "# / _-------=> irqs-off \n" -+ "# | / _------=> need-resched \n" -+ "# || / _-----=> need-resched_lazy \n" -+ "# ||| / _----=> hardirq/softirq \n" -+ "# |||| / _---=> preempt-depth \n" -+ "# ||||| / _--=> preempt-lazy-depth\n" -+ "# |||||| / _-=> migrate-disable \n" -+ "# ||||||| / delay \n" -+ "# cmd pid |||||||| time | caller \n" -+ "# \\ / |||||||| \\ | / \n"); - } - - static void print_event_info(struct trace_buffer *buf, struct seq_file *m) -@@ -2594,11 +2601,14 @@ static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file - print_event_info(buf, m); - seq_puts(m, "# _-----=> irqs-off\n" - "# / _----=> need-resched\n" -- "# | / _---=> hardirq/softirq\n" -- "# || / _--=> preempt-depth\n" -- "# ||| / delay\n" -- "# TASK-PID CPU# |||| TIMESTAMP FUNCTION\n" -- "# | | | |||| | |\n"); -+ "# |/ _-----=> need-resched_lazy\n" -+ "# || / _---=> hardirq/softirq\n" -+ "# ||| / _--=> preempt-depth\n" -+ "# |||| /_--=> preempt-lazy-depth\n" -+ "# ||||| _-=> migrate-disable \n" -+ "# ||||| / delay\n" -+ "# TASK-PID CPU# |||||| TIMESTAMP FUNCTION\n" -+ "# | | | |||||| | |\n"); - } - - void -diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h -index 3fff4adfd431..acb00bc2b0e0 100644 ---- a/kernel/trace/trace.h -+++ b/kernel/trace/trace.h -@@ -117,6 +117,7 @@ struct kretprobe_trace_entry_head { - * NEED_RESCHED - reschedule is requested - * HARDIRQ - inside an interrupt handler - * SOFTIRQ - inside a softirq handler -+ * NEED_RESCHED_LAZY - lazy reschedule is requested - */ - enum trace_flag_type { - TRACE_FLAG_IRQS_OFF = 0x01, -@@ -126,6 +127,7 @@ enum trace_flag_type { - TRACE_FLAG_SOFTIRQ = 0x10, - TRACE_FLAG_PREEMPT_RESCHED = 0x20, - TRACE_FLAG_NMI = 0x40, -+ TRACE_FLAG_NEED_RESCHED_LAZY = 0x80, - }; - - #define TRACE_BUF_SIZE 1024 -diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c -index 6f965864cc02..72a4cf8dbef5 100644 ---- a/kernel/trace/trace_events.c -+++ b/kernel/trace/trace_events.c -@@ -188,6 +188,8 @@ static int trace_define_common_fields(void) - __common_field(unsigned char, flags); - __common_field(unsigned char, preempt_count); - __common_field(int, pid); -+ __common_field(unsigned short, migrate_disable); -+ __common_field(unsigned short, padding); - - return ret; - } -@@ -244,6 +246,14 @@ void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, - - local_save_flags(fbuffer->flags); - fbuffer->pc = preempt_count(); -+ /* -+ * If CONFIG_PREEMPT is enabled, then the tracepoint itself disables -+ * preemption (adding one to the preempt_count). Since we are -+ * interested in the preempt_count at the time the tracepoint was -+ * hit, we need to subtract one to offset the increment. -+ */ -+ if (IS_ENABLED(CONFIG_PREEMPT)) -+ fbuffer->pc--; - fbuffer->trace_file = trace_file; - - fbuffer->event = -diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c -index 03cdff84d026..940bd10b4406 100644 ---- a/kernel/trace/trace_irqsoff.c -+++ b/kernel/trace/trace_irqsoff.c -@@ -13,6 +13,7 @@ - #include <linux/uaccess.h> - #include <linux/module.h> - #include <linux/ftrace.h> -+#include <trace/events/hist.h> - - #include "trace.h" - -@@ -424,11 +425,13 @@ void start_critical_timings(void) - { - if (preempt_trace() || irq_trace()) - start_critical_timing(CALLER_ADDR0, CALLER_ADDR1); -+ trace_preemptirqsoff_hist_rcuidle(TRACE_START, 1); - } - EXPORT_SYMBOL_GPL(start_critical_timings); - - void stop_critical_timings(void) - { -+ trace_preemptirqsoff_hist_rcuidle(TRACE_STOP, 0); - if (preempt_trace() || irq_trace()) - stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1); - } -@@ -438,6 +441,7 @@ EXPORT_SYMBOL_GPL(stop_critical_timings); - #ifdef CONFIG_PROVE_LOCKING - void time_hardirqs_on(unsigned long a0, unsigned long a1) - { -+ trace_preemptirqsoff_hist_rcuidle(IRQS_ON, 0); - if (!preempt_trace() && irq_trace()) - stop_critical_timing(a0, a1); - } -@@ -446,6 +450,7 @@ void time_hardirqs_off(unsigned long a0, unsigned long a1) - { - if (!preempt_trace() && irq_trace()) - start_critical_timing(a0, a1); -+ trace_preemptirqsoff_hist_rcuidle(IRQS_OFF, 1); - } - - #else /* !CONFIG_PROVE_LOCKING */ -@@ -471,6 +476,7 @@ inline void print_irqtrace_events(struct task_struct *curr) - */ - void trace_hardirqs_on(void) - { -+ trace_preemptirqsoff_hist(IRQS_ON, 0); - if (!preempt_trace() && irq_trace()) - stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1); - } -@@ -480,11 +486,13 @@ void trace_hardirqs_off(void) - { - if (!preempt_trace() && irq_trace()) - start_critical_timing(CALLER_ADDR0, CALLER_ADDR1); -+ trace_preemptirqsoff_hist(IRQS_OFF, 1); - } - EXPORT_SYMBOL(trace_hardirqs_off); - - __visible void trace_hardirqs_on_caller(unsigned long caller_addr) - { -+ trace_preemptirqsoff_hist(IRQS_ON, 0); - if (!preempt_trace() && irq_trace()) - stop_critical_timing(CALLER_ADDR0, caller_addr); - } -@@ -494,6 +502,7 @@ __visible void trace_hardirqs_off_caller(unsigned long caller_addr) - { - if (!preempt_trace() && irq_trace()) - start_critical_timing(CALLER_ADDR0, caller_addr); -+ trace_preemptirqsoff_hist(IRQS_OFF, 1); - } - EXPORT_SYMBOL(trace_hardirqs_off_caller); - -@@ -503,12 +512,14 @@ EXPORT_SYMBOL(trace_hardirqs_off_caller); - #ifdef CONFIG_PREEMPT_TRACER - void trace_preempt_on(unsigned long a0, unsigned long a1) - { -+ trace_preemptirqsoff_hist(PREEMPT_ON, 0); - if (preempt_trace() && !irq_trace()) - stop_critical_timing(a0, a1); - } - - void trace_preempt_off(unsigned long a0, unsigned long a1) - { -+ trace_preemptirqsoff_hist(PREEMPT_ON, 1); - if (preempt_trace() && !irq_trace()) - start_critical_timing(a0, a1); - } -diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c -index 0bb9cf2d53e6..455a7464772f 100644 ---- a/kernel/trace/trace_output.c -+++ b/kernel/trace/trace_output.c -@@ -386,6 +386,7 @@ int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry) - { - char hardsoft_irq; - char need_resched; -+ char need_resched_lazy; - char irqs_off; - int hardirq; - int softirq; -@@ -416,6 +417,9 @@ int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry) - break; - } - -+ need_resched_lazy = -+ (entry->flags & TRACE_FLAG_NEED_RESCHED_LAZY) ? 'L' : '.'; -+ - hardsoft_irq = - (nmi && hardirq) ? 'Z' : - nmi ? 'z' : -@@ -424,14 +428,25 @@ int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry) - softirq ? 's' : - '.' ; - -- trace_seq_printf(s, "%c%c%c", -- irqs_off, need_resched, hardsoft_irq); -+ trace_seq_printf(s, "%c%c%c%c", -+ irqs_off, need_resched, need_resched_lazy, -+ hardsoft_irq); - - if (entry->preempt_count) - trace_seq_printf(s, "%x", entry->preempt_count); - else - trace_seq_putc(s, '.'); - -+ if (entry->preempt_lazy_count) -+ trace_seq_printf(s, "%x", entry->preempt_lazy_count); -+ else -+ trace_seq_putc(s, '.'); -+ -+ if (entry->migrate_disable) -+ trace_seq_printf(s, "%x", entry->migrate_disable); -+ else -+ trace_seq_putc(s, '.'); -+ - return !trace_seq_has_overflowed(s); - } - -diff --git a/kernel/user.c b/kernel/user.c -index b069ccbfb0b0..1a2e88e98b5e 100644 ---- a/kernel/user.c -+++ b/kernel/user.c -@@ -161,11 +161,11 @@ void free_uid(struct user_struct *up) - if (!up) - return; - -- local_irq_save(flags); -+ local_irq_save_nort(flags); - if (atomic_dec_and_lock(&up->__count, &uidhash_lock)) - free_user(up, flags); - else -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - } - - struct user_struct *alloc_uid(kuid_t uid) -diff --git a/kernel/watchdog.c b/kernel/watchdog.c -index 9acb29f280ec..caba62080411 100644 ---- a/kernel/watchdog.c -+++ b/kernel/watchdog.c -@@ -315,6 +315,8 @@ static int is_softlockup(unsigned long touch_ts) - - #ifdef CONFIG_HARDLOCKUP_DETECTOR - -+static DEFINE_RAW_SPINLOCK(watchdog_output_lock); -+ - static struct perf_event_attr wd_hw_attr = { - .type = PERF_TYPE_HARDWARE, - .config = PERF_COUNT_HW_CPU_CYCLES, -@@ -349,6 +351,13 @@ static void watchdog_overflow_callback(struct perf_event *event, - /* only print hardlockups once */ - if (__this_cpu_read(hard_watchdog_warn) == true) - return; -+ /* -+ * If early-printk is enabled then make sure we do not -+ * lock up in printk() and kill console logging: -+ */ -+ printk_kill(); -+ -+ raw_spin_lock(&watchdog_output_lock); - - pr_emerg("Watchdog detected hard LOCKUP on cpu %d", this_cpu); - print_modules(); -@@ -366,6 +375,7 @@ static void watchdog_overflow_callback(struct perf_event *event, - !test_and_set_bit(0, &hardlockup_allcpu_dumped)) - trigger_allbutself_cpu_backtrace(); - -+ raw_spin_unlock(&watchdog_output_lock); - if (hardlockup_panic) - nmi_panic(regs, "Hard LOCKUP"); - -@@ -513,6 +523,7 @@ static void watchdog_enable(unsigned int cpu) - /* kick off the timer for the hardlockup detector */ - hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); - hrtimer->function = watchdog_timer_fn; -+ hrtimer->irqsafe = 1; - - /* Enable the perf event */ - watchdog_nmi_enable(cpu); -diff --git a/kernel/workqueue.c b/kernel/workqueue.c -index 5f5068e94003..54fd5dfb05b1 100644 ---- a/kernel/workqueue.c -+++ b/kernel/workqueue.c -@@ -48,6 +48,8 @@ - #include <linux/nodemask.h> - #include <linux/moduleparam.h> - #include <linux/uaccess.h> -+#include <linux/locallock.h> -+#include <linux/delay.h> - - #include "workqueue_internal.h" - -@@ -121,11 +123,16 @@ enum { - * cpu or grabbing pool->lock is enough for read access. If - * POOL_DISASSOCIATED is set, it's identical to L. - * -+ * On RT we need the extra protection via rt_lock_idle_list() for -+ * the list manipulations against read access from -+ * wq_worker_sleeping(). All other places are nicely serialized via -+ * pool->lock. -+ * - * A: pool->attach_mutex protected. - * - * PL: wq_pool_mutex protected. - * -- * PR: wq_pool_mutex protected for writes. Sched-RCU protected for reads. -+ * PR: wq_pool_mutex protected for writes. RCU protected for reads. - * - * PW: wq_pool_mutex and wq->mutex protected for writes. Either for reads. - * -@@ -134,7 +141,7 @@ enum { - * - * WQ: wq->mutex protected. - * -- * WR: wq->mutex protected for writes. Sched-RCU protected for reads. -+ * WR: wq->mutex protected for writes. RCU protected for reads. - * - * MD: wq_mayday_lock protected. - */ -@@ -185,7 +192,7 @@ struct worker_pool { - atomic_t nr_running ____cacheline_aligned_in_smp; - - /* -- * Destruction of pool is sched-RCU protected to allow dereferences -+ * Destruction of pool is RCU protected to allow dereferences - * from get_work_pool(). - */ - struct rcu_head rcu; -@@ -214,7 +221,7 @@ struct pool_workqueue { - /* - * Release of unbound pwq is punted to system_wq. See put_pwq() - * and pwq_unbound_release_workfn() for details. pool_workqueue -- * itself is also sched-RCU protected so that the first pwq can be -+ * itself is also RCU protected so that the first pwq can be - * determined without grabbing wq->mutex. - */ - struct work_struct unbound_release_work; -@@ -348,6 +355,8 @@ EXPORT_SYMBOL_GPL(system_power_efficient_wq); - struct workqueue_struct *system_freezable_power_efficient_wq __read_mostly; - EXPORT_SYMBOL_GPL(system_freezable_power_efficient_wq); - -+static DEFINE_LOCAL_IRQ_LOCK(pendingb_lock); -+ - static int worker_thread(void *__worker); - static void workqueue_sysfs_unregister(struct workqueue_struct *wq); - -@@ -355,20 +364,20 @@ static void workqueue_sysfs_unregister(struct workqueue_struct *wq); - #include <trace/events/workqueue.h> - - #define assert_rcu_or_pool_mutex() \ -- RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held() && \ -+ RCU_LOCKDEP_WARN(!rcu_read_lock_held() && \ - !lockdep_is_held(&wq_pool_mutex), \ -- "sched RCU or wq_pool_mutex should be held") -+ "RCU or wq_pool_mutex should be held") - - #define assert_rcu_or_wq_mutex(wq) \ -- RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held() && \ -+ RCU_LOCKDEP_WARN(!rcu_read_lock_held() && \ - !lockdep_is_held(&wq->mutex), \ -- "sched RCU or wq->mutex should be held") -+ "RCU or wq->mutex should be held") - - #define assert_rcu_or_wq_mutex_or_pool_mutex(wq) \ -- RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held() && \ -+ RCU_LOCKDEP_WARN(!rcu_read_lock_held() && \ - !lockdep_is_held(&wq->mutex) && \ - !lockdep_is_held(&wq_pool_mutex), \ -- "sched RCU, wq->mutex or wq_pool_mutex should be held") -+ "RCU, wq->mutex or wq_pool_mutex should be held") - - #define for_each_cpu_worker_pool(pool, cpu) \ - for ((pool) = &per_cpu(cpu_worker_pools, cpu)[0]; \ -@@ -380,7 +389,7 @@ static void workqueue_sysfs_unregister(struct workqueue_struct *wq); - * @pool: iteration cursor - * @pi: integer used for iteration - * -- * This must be called either with wq_pool_mutex held or sched RCU read -+ * This must be called either with wq_pool_mutex held or RCU read - * locked. If the pool needs to be used beyond the locking in effect, the - * caller is responsible for guaranteeing that the pool stays online. - * -@@ -412,7 +421,7 @@ static void workqueue_sysfs_unregister(struct workqueue_struct *wq); - * @pwq: iteration cursor - * @wq: the target workqueue - * -- * This must be called either with wq->mutex held or sched RCU read locked. -+ * This must be called either with wq->mutex held or RCU read locked. - * If the pwq needs to be used beyond the locking in effect, the caller is - * responsible for guaranteeing that the pwq stays online. - * -@@ -424,6 +433,31 @@ static void workqueue_sysfs_unregister(struct workqueue_struct *wq); - if (({ assert_rcu_or_wq_mutex(wq); false; })) { } \ - else - -+#ifdef CONFIG_PREEMPT_RT_BASE -+static inline void rt_lock_idle_list(struct worker_pool *pool) -+{ -+ preempt_disable(); -+} -+static inline void rt_unlock_idle_list(struct worker_pool *pool) -+{ -+ preempt_enable(); -+} -+static inline void sched_lock_idle_list(struct worker_pool *pool) { } -+static inline void sched_unlock_idle_list(struct worker_pool *pool) { } -+#else -+static inline void rt_lock_idle_list(struct worker_pool *pool) { } -+static inline void rt_unlock_idle_list(struct worker_pool *pool) { } -+static inline void sched_lock_idle_list(struct worker_pool *pool) -+{ -+ spin_lock_irq(&pool->lock); -+} -+static inline void sched_unlock_idle_list(struct worker_pool *pool) -+{ -+ spin_unlock_irq(&pool->lock); -+} -+#endif -+ -+ - #ifdef CONFIG_DEBUG_OBJECTS_WORK - - static struct debug_obj_descr work_debug_descr; -@@ -574,7 +608,7 @@ static int worker_pool_assign_id(struct worker_pool *pool) - * @wq: the target workqueue - * @node: the node ID - * -- * This must be called with any of wq_pool_mutex, wq->mutex or sched RCU -+ * This must be called with any of wq_pool_mutex, wq->mutex or RCU - * read locked. - * If the pwq needs to be used beyond the locking in effect, the caller is - * responsible for guaranteeing that the pwq stays online. -@@ -718,8 +752,8 @@ static struct pool_workqueue *get_work_pwq(struct work_struct *work) - * @work: the work item of interest - * - * Pools are created and destroyed under wq_pool_mutex, and allows read -- * access under sched-RCU read lock. As such, this function should be -- * called under wq_pool_mutex or with preemption disabled. -+ * access under RCU read lock. As such, this function should be -+ * called under wq_pool_mutex or inside of a rcu_read_lock() region. - * - * All fields of the returned pool are accessible as long as the above - * mentioned locking is in effect. If the returned pool needs to be used -@@ -856,50 +890,45 @@ static struct worker *first_idle_worker(struct worker_pool *pool) - */ - static void wake_up_worker(struct worker_pool *pool) - { -- struct worker *worker = first_idle_worker(pool); -+ struct worker *worker; -+ -+ rt_lock_idle_list(pool); -+ -+ worker = first_idle_worker(pool); - - if (likely(worker)) - wake_up_process(worker->task); -+ -+ rt_unlock_idle_list(pool); - } - - /** -- * wq_worker_waking_up - a worker is waking up -- * @task: task waking up -+ * wq_worker_running - a worker is running again - * @cpu: CPU @task is waking up to - * -- * This function is called during try_to_wake_up() when a worker is -- * being awoken. -- * -- * CONTEXT: -- * spin_lock_irq(rq->lock) -+ * This function is called when a worker returns from schedule() - */ --void wq_worker_waking_up(struct task_struct *task, int cpu) -+void wq_worker_running(struct task_struct *task) - { - struct worker *worker = kthread_data(task); - -- if (!(worker->flags & WORKER_NOT_RUNNING)) { -- WARN_ON_ONCE(worker->pool->cpu != cpu); -+ if (!worker->sleeping) -+ return; -+ if (!(worker->flags & WORKER_NOT_RUNNING)) - atomic_inc(&worker->pool->nr_running); -- } -+ worker->sleeping = 0; - } - - /** - * wq_worker_sleeping - a worker is going to sleep - * @task: task going to sleep - * -- * This function is called during schedule() when a busy worker is -- * going to sleep. Worker on the same cpu can be woken up by -- * returning pointer to its task. -- * -- * CONTEXT: -- * spin_lock_irq(rq->lock) -- * -- * Return: -- * Worker task on @cpu to wake up, %NULL if none. -+ * This function is called from schedule() when a busy worker is -+ * going to sleep. - */ --struct task_struct *wq_worker_sleeping(struct task_struct *task) -+void wq_worker_sleeping(struct task_struct *task) - { -- struct worker *worker = kthread_data(task), *to_wakeup = NULL; -+ struct worker *worker = kthread_data(task); - struct worker_pool *pool; - - /* -@@ -908,29 +937,26 @@ struct task_struct *wq_worker_sleeping(struct task_struct *task) - * checking NOT_RUNNING. - */ - if (worker->flags & WORKER_NOT_RUNNING) -- return NULL; -+ return; - - pool = worker->pool; - -- /* this can only happen on the local cpu */ -- if (WARN_ON_ONCE(pool->cpu != raw_smp_processor_id())) -- return NULL; -+ if (WARN_ON_ONCE(worker->sleeping)) -+ return; -+ -+ worker->sleeping = 1; - - /* - * The counterpart of the following dec_and_test, implied mb, - * worklist not empty test sequence is in insert_work(). - * Please read comment there. -- * -- * NOT_RUNNING is clear. This means that we're bound to and -- * running on the local cpu w/ rq lock held and preemption -- * disabled, which in turn means that none else could be -- * manipulating idle_list, so dereferencing idle_list without pool -- * lock is safe. - */ - if (atomic_dec_and_test(&pool->nr_running) && -- !list_empty(&pool->worklist)) -- to_wakeup = first_idle_worker(pool); -- return to_wakeup ? to_wakeup->task : NULL; -+ !list_empty(&pool->worklist)) { -+ sched_lock_idle_list(pool); -+ wake_up_worker(pool); -+ sched_unlock_idle_list(pool); -+ } - } - - /** -@@ -1124,12 +1150,12 @@ static void put_pwq_unlocked(struct pool_workqueue *pwq) - { - if (pwq) { - /* -- * As both pwqs and pools are sched-RCU protected, the -+ * As both pwqs and pools are RCU protected, the - * following lock operations are safe. - */ -- spin_lock_irq(&pwq->pool->lock); -+ local_spin_lock_irq(pendingb_lock, &pwq->pool->lock); - put_pwq(pwq); -- spin_unlock_irq(&pwq->pool->lock); -+ local_spin_unlock_irq(pendingb_lock, &pwq->pool->lock); - } - } - -@@ -1233,7 +1259,7 @@ static int try_to_grab_pending(struct work_struct *work, bool is_dwork, - struct worker_pool *pool; - struct pool_workqueue *pwq; - -- local_irq_save(*flags); -+ local_lock_irqsave(pendingb_lock, *flags); - - /* try to steal the timer if it exists */ - if (is_dwork) { -@@ -1252,6 +1278,7 @@ static int try_to_grab_pending(struct work_struct *work, bool is_dwork, - if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) - return 0; - -+ rcu_read_lock(); - /* - * The queueing is in progress, or it is already queued. Try to - * steal it from ->worklist without clearing WORK_STRUCT_PENDING. -@@ -1290,14 +1317,16 @@ static int try_to_grab_pending(struct work_struct *work, bool is_dwork, - set_work_pool_and_keep_pending(work, pool->id); - - spin_unlock(&pool->lock); -+ rcu_read_unlock(); - return 1; - } - spin_unlock(&pool->lock); - fail: -- local_irq_restore(*flags); -+ rcu_read_unlock(); -+ local_unlock_irqrestore(pendingb_lock, *flags); - if (work_is_canceling(work)) - return -ENOENT; -- cpu_relax(); -+ cpu_chill(); - return -EAGAIN; - } - -@@ -1399,7 +1428,7 @@ static void __queue_work(int cpu, struct workqueue_struct *wq, - * queued or lose PENDING. Grabbing PENDING and queueing should - * happen with IRQ disabled. - */ -- WARN_ON_ONCE(!irqs_disabled()); -+ WARN_ON_ONCE_NONRT(!irqs_disabled()); - - debug_work_activate(work); - -@@ -1407,6 +1436,7 @@ static void __queue_work(int cpu, struct workqueue_struct *wq, - if (unlikely(wq->flags & __WQ_DRAINING) && - WARN_ON_ONCE(!is_chained_work(wq))) - return; -+ rcu_read_lock(); - retry: - if (req_cpu == WORK_CPU_UNBOUND) - cpu = wq_select_unbound_cpu(raw_smp_processor_id()); -@@ -1463,10 +1493,8 @@ static void __queue_work(int cpu, struct workqueue_struct *wq, - /* pwq determined, queue */ - trace_workqueue_queue_work(req_cpu, pwq, work); - -- if (WARN_ON(!list_empty(&work->entry))) { -- spin_unlock(&pwq->pool->lock); -- return; -- } -+ if (WARN_ON(!list_empty(&work->entry))) -+ goto out; - - pwq->nr_in_flight[pwq->work_color]++; - work_flags = work_color_to_flags(pwq->work_color); -@@ -1484,7 +1512,9 @@ static void __queue_work(int cpu, struct workqueue_struct *wq, - - insert_work(pwq, work, worklist, work_flags); - -+out: - spin_unlock(&pwq->pool->lock); -+ rcu_read_unlock(); - } - - /** -@@ -1504,14 +1534,14 @@ bool queue_work_on(int cpu, struct workqueue_struct *wq, - bool ret = false; - unsigned long flags; - -- local_irq_save(flags); -+ local_lock_irqsave(pendingb_lock,flags); - - if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) { - __queue_work(cpu, wq, work); - ret = true; - } - -- local_irq_restore(flags); -+ local_unlock_irqrestore(pendingb_lock, flags); - return ret; - } - EXPORT_SYMBOL(queue_work_on); -@@ -1578,14 +1608,14 @@ bool queue_delayed_work_on(int cpu, struct workqueue_struct *wq, - unsigned long flags; - - /* read the comment in __queue_work() */ -- local_irq_save(flags); -+ local_lock_irqsave(pendingb_lock, flags); - - if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) { - __queue_delayed_work(cpu, wq, dwork, delay); - ret = true; - } - -- local_irq_restore(flags); -+ local_unlock_irqrestore(pendingb_lock, flags); - return ret; - } - EXPORT_SYMBOL(queue_delayed_work_on); -@@ -1620,7 +1650,7 @@ bool mod_delayed_work_on(int cpu, struct workqueue_struct *wq, - - if (likely(ret >= 0)) { - __queue_delayed_work(cpu, wq, dwork, delay); -- local_irq_restore(flags); -+ local_unlock_irqrestore(pendingb_lock, flags); - } - - /* -ENOENT from try_to_grab_pending() becomes %true */ -@@ -1653,7 +1683,9 @@ static void worker_enter_idle(struct worker *worker) - worker->last_active = jiffies; - - /* idle_list is LIFO */ -+ rt_lock_idle_list(pool); - list_add(&worker->entry, &pool->idle_list); -+ rt_unlock_idle_list(pool); - - if (too_many_workers(pool) && !timer_pending(&pool->idle_timer)) - mod_timer(&pool->idle_timer, jiffies + IDLE_WORKER_TIMEOUT); -@@ -1686,7 +1718,9 @@ static void worker_leave_idle(struct worker *worker) - return; - worker_clr_flags(worker, WORKER_IDLE); - pool->nr_idle--; -+ rt_lock_idle_list(pool); - list_del_init(&worker->entry); -+ rt_unlock_idle_list(pool); - } - - static struct worker *alloc_worker(int node) -@@ -1852,7 +1886,9 @@ static void destroy_worker(struct worker *worker) - pool->nr_workers--; - pool->nr_idle--; - -+ rt_lock_idle_list(pool); - list_del_init(&worker->entry); -+ rt_unlock_idle_list(pool); - worker->flags |= WORKER_DIE; - wake_up_process(worker->task); - } -@@ -2811,14 +2847,14 @@ static bool start_flush_work(struct work_struct *work, struct wq_barrier *barr) - - might_sleep(); - -- local_irq_disable(); -+ rcu_read_lock(); - pool = get_work_pool(work); - if (!pool) { -- local_irq_enable(); -+ rcu_read_unlock(); - return false; - } - -- spin_lock(&pool->lock); -+ spin_lock_irq(&pool->lock); - /* see the comment in try_to_grab_pending() with the same code */ - pwq = get_work_pwq(work); - if (pwq) { -@@ -2847,10 +2883,11 @@ static bool start_flush_work(struct work_struct *work, struct wq_barrier *barr) - else - lock_map_acquire_read(&pwq->wq->lockdep_map); - lock_map_release(&pwq->wq->lockdep_map); -- -+ rcu_read_unlock(); - return true; - already_gone: - spin_unlock_irq(&pool->lock); -+ rcu_read_unlock(); - return false; - } - -@@ -2937,7 +2974,7 @@ static bool __cancel_work_timer(struct work_struct *work, bool is_dwork) - - /* tell other tasks trying to grab @work to back off */ - mark_work_canceling(work); -- local_irq_restore(flags); -+ local_unlock_irqrestore(pendingb_lock, flags); - - flush_work(work); - clear_work_data(work); -@@ -2992,10 +3029,10 @@ EXPORT_SYMBOL_GPL(cancel_work_sync); - */ - bool flush_delayed_work(struct delayed_work *dwork) - { -- local_irq_disable(); -+ local_lock_irq(pendingb_lock); - if (del_timer_sync(&dwork->timer)) - __queue_work(dwork->cpu, dwork->wq, &dwork->work); -- local_irq_enable(); -+ local_unlock_irq(pendingb_lock); - return flush_work(&dwork->work); - } - EXPORT_SYMBOL(flush_delayed_work); -@@ -3030,7 +3067,7 @@ bool cancel_delayed_work(struct delayed_work *dwork) - - set_work_pool_and_clear_pending(&dwork->work, - get_work_pool_id(&dwork->work)); -- local_irq_restore(flags); -+ local_unlock_irqrestore(pendingb_lock, flags); - return ret; - } - EXPORT_SYMBOL(cancel_delayed_work); -@@ -3259,7 +3296,7 @@ static void rcu_free_pool(struct rcu_head *rcu) - * put_unbound_pool - put a worker_pool - * @pool: worker_pool to put - * -- * Put @pool. If its refcnt reaches zero, it gets destroyed in sched-RCU -+ * Put @pool. If its refcnt reaches zero, it gets destroyed in RCU - * safe manner. get_unbound_pool() calls this function on its failure path - * and this function should be able to release pools which went through, - * successfully or not, init_worker_pool(). -@@ -3313,8 +3350,8 @@ static void put_unbound_pool(struct worker_pool *pool) - del_timer_sync(&pool->idle_timer); - del_timer_sync(&pool->mayday_timer); - -- /* sched-RCU protected to allow dereferences from get_work_pool() */ -- call_rcu_sched(&pool->rcu, rcu_free_pool); -+ /* RCU protected to allow dereferences from get_work_pool() */ -+ call_rcu(&pool->rcu, rcu_free_pool); - } - - /** -@@ -3421,14 +3458,14 @@ static void pwq_unbound_release_workfn(struct work_struct *work) - put_unbound_pool(pool); - mutex_unlock(&wq_pool_mutex); - -- call_rcu_sched(&pwq->rcu, rcu_free_pwq); -+ call_rcu(&pwq->rcu, rcu_free_pwq); - - /* - * If we're the last pwq going away, @wq is already dead and no one - * is gonna access it anymore. Schedule RCU free. - */ - if (is_last) -- call_rcu_sched(&wq->rcu, rcu_free_wq); -+ call_rcu(&wq->rcu, rcu_free_wq); - } - - /** -@@ -4078,7 +4115,7 @@ void destroy_workqueue(struct workqueue_struct *wq) - * The base ref is never dropped on per-cpu pwqs. Directly - * schedule RCU free. - */ -- call_rcu_sched(&wq->rcu, rcu_free_wq); -+ call_rcu(&wq->rcu, rcu_free_wq); - } else { - /* - * We're the sole accessor of @wq at this point. Directly -@@ -4171,7 +4208,8 @@ bool workqueue_congested(int cpu, struct workqueue_struct *wq) - struct pool_workqueue *pwq; - bool ret; - -- rcu_read_lock_sched(); -+ rcu_read_lock(); -+ preempt_disable(); - - if (cpu == WORK_CPU_UNBOUND) - cpu = smp_processor_id(); -@@ -4182,7 +4220,8 @@ bool workqueue_congested(int cpu, struct workqueue_struct *wq) - pwq = unbound_pwq_by_node(wq, cpu_to_node(cpu)); - - ret = !list_empty(&pwq->delayed_works); -- rcu_read_unlock_sched(); -+ preempt_enable(); -+ rcu_read_unlock(); - - return ret; - } -@@ -4208,15 +4247,15 @@ unsigned int work_busy(struct work_struct *work) - if (work_pending(work)) - ret |= WORK_BUSY_PENDING; - -- local_irq_save(flags); -+ rcu_read_lock(); - pool = get_work_pool(work); - if (pool) { -- spin_lock(&pool->lock); -+ spin_lock_irqsave(&pool->lock, flags); - if (find_worker_executing_work(pool, work)) - ret |= WORK_BUSY_RUNNING; -- spin_unlock(&pool->lock); -+ spin_unlock_irqrestore(&pool->lock, flags); - } -- local_irq_restore(flags); -+ rcu_read_unlock(); - - return ret; - } -@@ -4405,7 +4444,7 @@ void show_workqueue_state(void) - unsigned long flags; - int pi; - -- rcu_read_lock_sched(); -+ rcu_read_lock(); - - pr_info("Showing busy workqueues and worker pools:\n"); - -@@ -4458,7 +4497,7 @@ void show_workqueue_state(void) - spin_unlock_irqrestore(&pool->lock, flags); - } - -- rcu_read_unlock_sched(); -+ rcu_read_unlock(); - } - - /* -@@ -4819,16 +4858,16 @@ bool freeze_workqueues_busy(void) - * nr_active is monotonically decreasing. It's safe - * to peek without lock. - */ -- rcu_read_lock_sched(); -+ rcu_read_lock(); - for_each_pwq(pwq, wq) { - WARN_ON_ONCE(pwq->nr_active < 0); - if (pwq->nr_active) { - busy = true; -- rcu_read_unlock_sched(); -+ rcu_read_unlock(); - goto out_unlock; - } - } -- rcu_read_unlock_sched(); -+ rcu_read_unlock(); - } - out_unlock: - mutex_unlock(&wq_pool_mutex); -@@ -5018,7 +5057,8 @@ static ssize_t wq_pool_ids_show(struct device *dev, - const char *delim = ""; - int node, written = 0; - -- rcu_read_lock_sched(); -+ get_online_cpus(); -+ rcu_read_lock(); - for_each_node(node) { - written += scnprintf(buf + written, PAGE_SIZE - written, - "%s%d:%d", delim, node, -@@ -5026,7 +5066,8 @@ static ssize_t wq_pool_ids_show(struct device *dev, - delim = " "; - } - written += scnprintf(buf + written, PAGE_SIZE - written, "\n"); -- rcu_read_unlock_sched(); -+ rcu_read_unlock(); -+ put_online_cpus(); - - return written; - } -diff --git a/kernel/workqueue_internal.h b/kernel/workqueue_internal.h -index 8635417c587b..f000c4d6917e 100644 ---- a/kernel/workqueue_internal.h -+++ b/kernel/workqueue_internal.h -@@ -43,6 +43,7 @@ struct worker { - unsigned long last_active; /* L: last active timestamp */ - unsigned int flags; /* X: flags */ - int id; /* I: worker id */ -+ int sleeping; /* None */ - - /* - * Opaque string set with work_set_desc(). Printed out with task -@@ -68,7 +69,7 @@ static inline struct worker *current_wq_worker(void) - * Scheduler hooks for concurrency managed workqueue. Only to be used from - * sched/core.c and workqueue.c. - */ --void wq_worker_waking_up(struct task_struct *task, int cpu); --struct task_struct *wq_worker_sleeping(struct task_struct *task); -+void wq_worker_running(struct task_struct *task); -+void wq_worker_sleeping(struct task_struct *task); - - #endif /* _KERNEL_WORKQUEUE_INTERNAL_H */ -diff --git a/lib/Kconfig b/lib/Kconfig -index 3cca1222578e..b89fc373331f 100644 ---- a/lib/Kconfig -+++ b/lib/Kconfig -@@ -397,6 +397,7 @@ config CHECK_SIGNATURE - - config CPUMASK_OFFSTACK - bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS -+ depends on !PREEMPT_RT_FULL - help - Use dynamic allocation for cpumask_var_t, instead of putting - them on the stack. This is a bit more expensive, but avoids -diff --git a/lib/debugobjects.c b/lib/debugobjects.c -index 519b5a10fd70..5970701e8f1e 100644 ---- a/lib/debugobjects.c -+++ b/lib/debugobjects.c -@@ -309,7 +309,10 @@ __debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack) - struct debug_obj *obj; - unsigned long flags; - -- fill_pool(); -+#ifdef CONFIG_PREEMPT_RT_FULL -+ if (preempt_count() == 0 && !irqs_disabled()) -+#endif -+ fill_pool(); - - db = get_bucket((unsigned long) addr); - -diff --git a/lib/idr.c b/lib/idr.c -index 6098336df267..9decbe914595 100644 ---- a/lib/idr.c -+++ b/lib/idr.c -@@ -30,6 +30,7 @@ - #include <linux/idr.h> - #include <linux/spinlock.h> - #include <linux/percpu.h> -+#include <linux/locallock.h> - - #define MAX_IDR_SHIFT (sizeof(int) * 8 - 1) - #define MAX_IDR_BIT (1U << MAX_IDR_SHIFT) -@@ -45,6 +46,37 @@ static DEFINE_PER_CPU(struct idr_layer *, idr_preload_head); - static DEFINE_PER_CPU(int, idr_preload_cnt); - static DEFINE_SPINLOCK(simple_ida_lock); - -+#ifdef CONFIG_PREEMPT_RT_FULL -+static DEFINE_LOCAL_IRQ_LOCK(idr_lock); -+ -+static inline void idr_preload_lock(void) -+{ -+ local_lock(idr_lock); -+} -+ -+static inline void idr_preload_unlock(void) -+{ -+ local_unlock(idr_lock); -+} -+ -+void idr_preload_end(void) -+{ -+ idr_preload_unlock(); -+} -+EXPORT_SYMBOL(idr_preload_end); -+#else -+static inline void idr_preload_lock(void) -+{ -+ preempt_disable(); -+} -+ -+static inline void idr_preload_unlock(void) -+{ -+ preempt_enable(); -+} -+#endif -+ -+ - /* the maximum ID which can be allocated given idr->layers */ - static int idr_max(int layers) - { -@@ -115,14 +147,14 @@ static struct idr_layer *idr_layer_alloc(gfp_t gfp_mask, struct idr *layer_idr) - * context. See idr_preload() for details. - */ - if (!in_interrupt()) { -- preempt_disable(); -+ idr_preload_lock(); - new = __this_cpu_read(idr_preload_head); - if (new) { - __this_cpu_write(idr_preload_head, new->ary[0]); - __this_cpu_dec(idr_preload_cnt); - new->ary[0] = NULL; - } -- preempt_enable(); -+ idr_preload_unlock(); - if (new) - return new; - } -@@ -366,7 +398,6 @@ static void idr_fill_slot(struct idr *idr, void *ptr, int id, - idr_mark_full(pa, id); - } - -- - /** - * idr_preload - preload for idr_alloc() - * @gfp_mask: allocation mask to use for preloading -@@ -401,7 +432,7 @@ void idr_preload(gfp_t gfp_mask) - WARN_ON_ONCE(in_interrupt()); - might_sleep_if(gfpflags_allow_blocking(gfp_mask)); - -- preempt_disable(); -+ idr_preload_lock(); - - /* - * idr_alloc() is likely to succeed w/o full idr_layer buffer and -@@ -413,9 +444,9 @@ void idr_preload(gfp_t gfp_mask) - while (__this_cpu_read(idr_preload_cnt) < MAX_IDR_FREE) { - struct idr_layer *new; - -- preempt_enable(); -+ idr_preload_unlock(); - new = kmem_cache_zalloc(idr_layer_cache, gfp_mask); -- preempt_disable(); -+ idr_preload_lock(); - if (!new) - break; - -diff --git a/lib/irq_poll.c b/lib/irq_poll.c -index 836f7db4e548..709d4eed1df9 100644 ---- a/lib/irq_poll.c -+++ b/lib/irq_poll.c -@@ -36,6 +36,7 @@ void irq_poll_sched(struct irq_poll *iop) - list_add_tail(&iop->list, this_cpu_ptr(&blk_cpu_iopoll)); - __raise_softirq_irqoff(IRQ_POLL_SOFTIRQ); - local_irq_restore(flags); -+ preempt_check_resched_rt(); - } - EXPORT_SYMBOL(irq_poll_sched); - -@@ -71,6 +72,7 @@ void irq_poll_complete(struct irq_poll *iop) - local_irq_save(flags); - __irq_poll_complete(iop); - local_irq_restore(flags); -+ preempt_check_resched_rt(); - } - EXPORT_SYMBOL(irq_poll_complete); - -@@ -95,6 +97,7 @@ static void irq_poll_softirq(struct softirq_action *h) - } - - local_irq_enable(); -+ preempt_check_resched_rt(); - - /* Even though interrupts have been re-enabled, this - * access is safe because interrupts can only add new -@@ -132,6 +135,7 @@ static void irq_poll_softirq(struct softirq_action *h) - __raise_softirq_irqoff(IRQ_POLL_SOFTIRQ); - - local_irq_enable(); -+ preempt_check_resched_rt(); - } - - /** -@@ -199,6 +203,7 @@ static int irq_poll_cpu_notify(struct notifier_block *self, - this_cpu_ptr(&blk_cpu_iopoll)); - __raise_softirq_irqoff(IRQ_POLL_SOFTIRQ); - local_irq_enable(); -+ preempt_check_resched_rt(); - } - - return NOTIFY_OK; -diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c -index 872a15a2a637..b93a6103fa4d 100644 ---- a/lib/locking-selftest.c -+++ b/lib/locking-selftest.c -@@ -590,6 +590,8 @@ GENERATE_TESTCASE(init_held_rsem) - #include "locking-selftest-spin-hardirq.h" - GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin) - -+#ifndef CONFIG_PREEMPT_RT_FULL -+ - #include "locking-selftest-rlock-hardirq.h" - GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock) - -@@ -605,9 +607,12 @@ GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock) - #include "locking-selftest-wlock-softirq.h" - GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock) - -+#endif -+ - #undef E1 - #undef E2 - -+#ifndef CONFIG_PREEMPT_RT_FULL - /* - * Enabling hardirqs with a softirq-safe lock held: - */ -@@ -640,6 +645,8 @@ GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock) - #undef E1 - #undef E2 - -+#endif -+ - /* - * Enabling irqs with an irq-safe lock held: - */ -@@ -663,6 +670,8 @@ GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock) - #include "locking-selftest-spin-hardirq.h" - GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin) - -+#ifndef CONFIG_PREEMPT_RT_FULL -+ - #include "locking-selftest-rlock-hardirq.h" - GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock) - -@@ -678,6 +687,8 @@ GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock) - #include "locking-selftest-wlock-softirq.h" - GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock) - -+#endif -+ - #undef E1 - #undef E2 - -@@ -709,6 +720,8 @@ GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock) - #include "locking-selftest-spin-hardirq.h" - GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin) - -+#ifndef CONFIG_PREEMPT_RT_FULL -+ - #include "locking-selftest-rlock-hardirq.h" - GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock) - -@@ -724,6 +737,8 @@ GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock) - #include "locking-selftest-wlock-softirq.h" - GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock) - -+#endif -+ - #undef E1 - #undef E2 - #undef E3 -@@ -757,6 +772,8 @@ GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock) - #include "locking-selftest-spin-hardirq.h" - GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin) - -+#ifndef CONFIG_PREEMPT_RT_FULL -+ - #include "locking-selftest-rlock-hardirq.h" - GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock) - -@@ -772,10 +789,14 @@ GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock) - #include "locking-selftest-wlock-softirq.h" - GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock) - -+#endif -+ - #undef E1 - #undef E2 - #undef E3 - -+#ifndef CONFIG_PREEMPT_RT_FULL -+ - /* - * read-lock / write-lock irq inversion. - * -@@ -838,6 +859,10 @@ GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock) - #undef E2 - #undef E3 - -+#endif -+ -+#ifndef CONFIG_PREEMPT_RT_FULL -+ - /* - * read-lock / write-lock recursion that is actually safe. - */ -@@ -876,6 +901,8 @@ GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft) - #undef E2 - #undef E3 - -+#endif -+ - /* - * read-lock / write-lock recursion that is unsafe. - */ -@@ -1858,6 +1885,7 @@ void locking_selftest(void) - - printk(" --------------------------------------------------------------------------\n"); - -+#ifndef CONFIG_PREEMPT_RT_FULL - /* - * irq-context testcases: - */ -@@ -1870,6 +1898,28 @@ void locking_selftest(void) - - DO_TESTCASE_6x2("irq read-recursion", irq_read_recursion); - // DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2); -+#else -+ /* On -rt, we only do hardirq context test for raw spinlock */ -+ DO_TESTCASE_1B("hard-irqs-on + irq-safe-A", irqsafe1_hard_spin, 12); -+ DO_TESTCASE_1B("hard-irqs-on + irq-safe-A", irqsafe1_hard_spin, 21); -+ -+ DO_TESTCASE_1B("hard-safe-A + irqs-on", irqsafe2B_hard_spin, 12); -+ DO_TESTCASE_1B("hard-safe-A + irqs-on", irqsafe2B_hard_spin, 21); -+ -+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 123); -+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 132); -+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 213); -+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 231); -+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 312); -+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 321); -+ -+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 123); -+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 132); -+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 213); -+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 231); -+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 312); -+ DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 321); -+#endif - - ww_tests(); - -diff --git a/lib/percpu_ida.c b/lib/percpu_ida.c -index 6d40944960de..822a2c027e72 100644 ---- a/lib/percpu_ida.c -+++ b/lib/percpu_ida.c -@@ -26,6 +26,9 @@ - #include <linux/string.h> - #include <linux/spinlock.h> - #include <linux/percpu_ida.h> -+#include <linux/locallock.h> -+ -+static DEFINE_LOCAL_IRQ_LOCK(irq_off_lock); - - struct percpu_ida_cpu { - /* -@@ -148,13 +151,13 @@ int percpu_ida_alloc(struct percpu_ida *pool, int state) - unsigned long flags; - int tag; - -- local_irq_save(flags); -+ local_lock_irqsave(irq_off_lock, flags); - tags = this_cpu_ptr(pool->tag_cpu); - - /* Fastpath */ - tag = alloc_local_tag(tags); - if (likely(tag >= 0)) { -- local_irq_restore(flags); -+ local_unlock_irqrestore(irq_off_lock, flags); - return tag; - } - -@@ -173,6 +176,7 @@ int percpu_ida_alloc(struct percpu_ida *pool, int state) - - if (!tags->nr_free) - alloc_global_tags(pool, tags); -+ - if (!tags->nr_free) - steal_tags(pool, tags); - -@@ -184,7 +188,7 @@ int percpu_ida_alloc(struct percpu_ida *pool, int state) - } - - spin_unlock(&pool->lock); -- local_irq_restore(flags); -+ local_unlock_irqrestore(irq_off_lock, flags); - - if (tag >= 0 || state == TASK_RUNNING) - break; -@@ -196,7 +200,7 @@ int percpu_ida_alloc(struct percpu_ida *pool, int state) - - schedule(); - -- local_irq_save(flags); -+ local_lock_irqsave(irq_off_lock, flags); - tags = this_cpu_ptr(pool->tag_cpu); - } - if (state != TASK_RUNNING) -@@ -221,7 +225,7 @@ void percpu_ida_free(struct percpu_ida *pool, unsigned tag) - - BUG_ON(tag >= pool->nr_tags); - -- local_irq_save(flags); -+ local_lock_irqsave(irq_off_lock, flags); - tags = this_cpu_ptr(pool->tag_cpu); - - spin_lock(&tags->lock); -@@ -253,7 +257,7 @@ void percpu_ida_free(struct percpu_ida *pool, unsigned tag) - spin_unlock(&pool->lock); - } - -- local_irq_restore(flags); -+ local_unlock_irqrestore(irq_off_lock, flags); - } - EXPORT_SYMBOL_GPL(percpu_ida_free); - -@@ -345,7 +349,7 @@ int percpu_ida_for_each_free(struct percpu_ida *pool, percpu_ida_cb fn, - struct percpu_ida_cpu *remote; - unsigned cpu, i, err = 0; - -- local_irq_save(flags); -+ local_lock_irqsave(irq_off_lock, flags); - for_each_possible_cpu(cpu) { - remote = per_cpu_ptr(pool->tag_cpu, cpu); - spin_lock(&remote->lock); -@@ -367,7 +371,7 @@ int percpu_ida_for_each_free(struct percpu_ida *pool, percpu_ida_cb fn, - } - spin_unlock(&pool->lock); - out: -- local_irq_restore(flags); -+ local_unlock_irqrestore(irq_off_lock, flags); - return err; - } - EXPORT_SYMBOL_GPL(percpu_ida_for_each_free); -diff --git a/lib/radix-tree.c b/lib/radix-tree.c -index 1624c4117961..5f53e83b2859 100644 ---- a/lib/radix-tree.c -+++ b/lib/radix-tree.c -@@ -240,13 +240,14 @@ radix_tree_node_alloc(struct radix_tree_root *root) - * succeed in getting a node here (and never reach - * kmem_cache_alloc) - */ -- rtp = this_cpu_ptr(&radix_tree_preloads); -+ rtp = &get_cpu_var(radix_tree_preloads); - if (rtp->nr) { - ret = rtp->nodes; - rtp->nodes = ret->private_data; - ret->private_data = NULL; - rtp->nr--; - } -+ put_cpu_var(radix_tree_preloads); - /* - * Update the allocation stack trace as this is more useful - * for debugging. -@@ -287,6 +288,7 @@ radix_tree_node_free(struct radix_tree_node *node) - call_rcu(&node->rcu_head, radix_tree_node_rcu_free); - } - -+#ifndef CONFIG_PREEMPT_RT_FULL - /* - * Load up this CPU's radix_tree_node buffer with sufficient objects to - * ensure that the addition of a single element in the tree cannot fail. On -@@ -355,6 +357,7 @@ int radix_tree_maybe_preload(gfp_t gfp_mask) - return 0; - } - EXPORT_SYMBOL(radix_tree_maybe_preload); -+#endif - - /* - * Return the maximum key which can be store into a -diff --git a/lib/random32.c b/lib/random32.c -index 510d1ce7d4d2..69ed593aab07 100644 ---- a/lib/random32.c -+++ b/lib/random32.c -@@ -233,7 +233,6 @@ static void __prandom_timer(unsigned long dontcare) - - static void __init __prandom_start_seed_timer(void) - { -- set_timer_slack(&seed_timer, HZ); - seed_timer.expires = jiffies + msecs_to_jiffies(40 * MSEC_PER_SEC); - add_timer(&seed_timer); - } -diff --git a/lib/rbtree.c b/lib/rbtree.c -index 1356454e36de..d15d6c4327f1 100644 ---- a/lib/rbtree.c -+++ b/lib/rbtree.c -@@ -23,6 +23,7 @@ - - #include <linux/rbtree_augmented.h> - #include <linux/export.h> -+#include <linux/rcupdate.h> - - /* - * red-black trees properties: http://en.wikipedia.org/wiki/Rbtree -@@ -590,3 +591,13 @@ struct rb_node *rb_first_postorder(const struct rb_root *root) - return rb_left_deepest_node(root->rb_node); - } - EXPORT_SYMBOL(rb_first_postorder); -+ -+void rb_link_node_rcu(struct rb_node *node, struct rb_node *parent, -+ struct rb_node **rb_link) -+{ -+ node->__rb_parent_color = (unsigned long)parent; -+ node->rb_left = node->rb_right = NULL; -+ -+ rcu_assign_pointer(*rb_link, node); -+} -+EXPORT_SYMBOL(rb_link_node_rcu); -diff --git a/lib/scatterlist.c b/lib/scatterlist.c -index 004fc70fc56a..ccc46992a517 100644 ---- a/lib/scatterlist.c -+++ b/lib/scatterlist.c -@@ -620,7 +620,7 @@ void sg_miter_stop(struct sg_mapping_iter *miter) - flush_kernel_dcache_page(miter->page); - - if (miter->__flags & SG_MITER_ATOMIC) { -- WARN_ON_ONCE(preemptible()); -+ WARN_ON_ONCE(!pagefault_disabled()); - kunmap_atomic(miter->addr); - } else - kunmap(miter->page); -@@ -664,7 +664,7 @@ size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, void *buf, - if (!sg_miter_skip(&miter, skip)) - return false; - -- local_irq_save(flags); -+ local_irq_save_nort(flags); - - while (sg_miter_next(&miter) && offset < buflen) { - unsigned int len; -@@ -681,7 +681,7 @@ size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, void *buf, - - sg_miter_stop(&miter); - -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - return offset; - } - EXPORT_SYMBOL(sg_copy_buffer); -diff --git a/lib/smp_processor_id.c b/lib/smp_processor_id.c -index 1afec32de6f2..11fa431046a8 100644 ---- a/lib/smp_processor_id.c -+++ b/lib/smp_processor_id.c -@@ -39,8 +39,9 @@ notrace static unsigned int check_preemption_disabled(const char *what1, - if (!printk_ratelimit()) - goto out_enable; - -- printk(KERN_ERR "BUG: using %s%s() in preemptible [%08x] code: %s/%d\n", -- what1, what2, preempt_count() - 1, current->comm, current->pid); -+ printk(KERN_ERR "BUG: using %s%s() in preemptible [%08x %08x] code: %s/%d\n", -+ what1, what2, preempt_count() - 1, __migrate_disabled(current), -+ current->comm, current->pid); - - print_symbol("caller is %s\n", (long)__builtin_return_address(0)); - dump_stack(); -diff --git a/mm/Kconfig b/mm/Kconfig -index 989f8f3d77e0..1df53d6c7ec5 100644 ---- a/mm/Kconfig -+++ b/mm/Kconfig -@@ -391,7 +391,7 @@ config NOMMU_INITIAL_TRIM_EXCESS - - config TRANSPARENT_HUGEPAGE - bool "Transparent Hugepage Support" -- depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE -+ depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE && !PREEMPT_RT_FULL - select COMPACTION - help - Transparent Hugepages allows the kernel to use huge pages and -diff --git a/mm/backing-dev.c b/mm/backing-dev.c -index 0c6317b7db38..1e6ab5fbadb4 100644 ---- a/mm/backing-dev.c -+++ b/mm/backing-dev.c -@@ -457,9 +457,9 @@ void wb_congested_put(struct bdi_writeback_congested *congested) - { - unsigned long flags; - -- local_irq_save(flags); -+ local_irq_save_nort(flags); - if (!atomic_dec_and_lock(&congested->refcnt, &cgwb_lock)) { -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - return; - } - -diff --git a/mm/compaction.c b/mm/compaction.c -index f8e925eb479b..14cfc4714e57 100644 ---- a/mm/compaction.c -+++ b/mm/compaction.c -@@ -1414,10 +1414,12 @@ static int compact_zone(struct zone *zone, struct compact_control *cc) - cc->migrate_pfn & ~((1UL << cc->order) - 1); - - if (cc->last_migrated_pfn < current_block_start) { -- cpu = get_cpu(); -+ cpu = get_cpu_light(); -+ local_lock_irq(swapvec_lock); - lru_add_drain_cpu(cpu); -+ local_unlock_irq(swapvec_lock); - drain_local_pages(zone); -- put_cpu(); -+ put_cpu_light(); - /* No more flushing until we migrate again */ - cc->last_migrated_pfn = 0; - } -diff --git a/mm/filemap.c b/mm/filemap.c -index f2479af09da9..a87b65c2e402 100644 ---- a/mm/filemap.c -+++ b/mm/filemap.c -@@ -169,7 +169,9 @@ static void page_cache_tree_delete(struct address_space *mapping, - if (!workingset_node_pages(node) && - list_empty(&node->private_list)) { - node->private_data = mapping; -- list_lru_add(&workingset_shadow_nodes, &node->private_list); -+ local_lock(workingset_shadow_lock); -+ list_lru_add(&__workingset_shadow_nodes, &node->private_list); -+ local_unlock(workingset_shadow_lock); - } - } - -@@ -618,9 +620,12 @@ static int page_cache_tree_insert(struct address_space *mapping, - * node->private_list is protected by - * mapping->tree_lock. - */ -- if (!list_empty(&node->private_list)) -- list_lru_del(&workingset_shadow_nodes, -+ if (!list_empty(&node->private_list)) { -+ local_lock(workingset_shadow_lock); -+ list_lru_del(&__workingset_shadow_nodes, - &node->private_list); -+ local_unlock(workingset_shadow_lock); -+ } - } - return 0; - } -diff --git a/mm/highmem.c b/mm/highmem.c -index 123bcd3ed4f2..16e8cf26d38a 100644 ---- a/mm/highmem.c -+++ b/mm/highmem.c -@@ -29,10 +29,11 @@ - #include <linux/kgdb.h> - #include <asm/tlbflush.h> - -- -+#ifndef CONFIG_PREEMPT_RT_FULL - #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32) - DEFINE_PER_CPU(int, __kmap_atomic_idx); - #endif -+#endif - - /* - * Virtual_count is not a pure "count". -@@ -107,8 +108,9 @@ static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color) - unsigned long totalhigh_pages __read_mostly; - EXPORT_SYMBOL(totalhigh_pages); - -- -+#ifndef CONFIG_PREEMPT_RT_FULL - EXPORT_PER_CPU_SYMBOL(__kmap_atomic_idx); -+#endif - - unsigned int nr_free_highpages (void) - { -diff --git a/mm/memcontrol.c b/mm/memcontrol.c -index a2e79b83920f..9764ec471f4d 100644 ---- a/mm/memcontrol.c -+++ b/mm/memcontrol.c -@@ -67,6 +67,7 @@ - #include <net/sock.h> - #include <net/ip.h> - #include "slab.h" -+#include <linux/locallock.h> - - #include <asm/uaccess.h> - -@@ -92,6 +93,8 @@ int do_swap_account __read_mostly; - #define do_swap_account 0 - #endif - -+static DEFINE_LOCAL_IRQ_LOCK(event_lock); -+ - /* Whether legacy memory+swap accounting is active */ - static bool do_memsw_account(void) - { -@@ -1825,14 +1828,17 @@ static void drain_local_stock(struct work_struct *dummy) - */ - static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages) - { -- struct memcg_stock_pcp *stock = &get_cpu_var(memcg_stock); -+ struct memcg_stock_pcp *stock; -+ int cpu = get_cpu_light(); -+ -+ stock = &per_cpu(memcg_stock, cpu); - - if (stock->cached != memcg) { /* reset if necessary */ - drain_stock(stock); - stock->cached = memcg; - } - stock->nr_pages += nr_pages; -- put_cpu_var(memcg_stock); -+ put_cpu_light(); - } - - /* -@@ -1848,7 +1854,7 @@ static void drain_all_stock(struct mem_cgroup *root_memcg) - return; - /* Notify other cpus that system-wide "drain" is running */ - get_online_cpus(); -- curcpu = get_cpu(); -+ curcpu = get_cpu_light(); - for_each_online_cpu(cpu) { - struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu); - struct mem_cgroup *memcg; -@@ -1865,7 +1871,7 @@ static void drain_all_stock(struct mem_cgroup *root_memcg) - schedule_work_on(cpu, &stock->work); - } - } -- put_cpu(); -+ put_cpu_light(); - put_online_cpus(); - mutex_unlock(&percpu_charge_mutex); - } -@@ -4487,12 +4493,12 @@ static int mem_cgroup_move_account(struct page *page, - - ret = 0; - -- local_irq_disable(); -+ local_lock_irq(event_lock); - mem_cgroup_charge_statistics(to, page, compound, nr_pages); - memcg_check_events(to, page); - mem_cgroup_charge_statistics(from, page, compound, -nr_pages); - memcg_check_events(from, page); -- local_irq_enable(); -+ local_unlock_irq(event_lock); - out_unlock: - unlock_page(page); - out: -@@ -5342,10 +5348,10 @@ void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg, - - commit_charge(page, memcg, lrucare); - -- local_irq_disable(); -+ local_lock_irq(event_lock); - mem_cgroup_charge_statistics(memcg, page, compound, nr_pages); - memcg_check_events(memcg, page); -- local_irq_enable(); -+ local_unlock_irq(event_lock); - - if (do_memsw_account() && PageSwapCache(page)) { - swp_entry_t entry = { .val = page_private(page) }; -@@ -5397,14 +5403,14 @@ static void uncharge_batch(struct mem_cgroup *memcg, unsigned long pgpgout, - memcg_oom_recover(memcg); - } - -- local_irq_save(flags); -+ local_lock_irqsave(event_lock, flags); - __this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_RSS], nr_anon); - __this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_CACHE], nr_file); - __this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_RSS_HUGE], nr_huge); - __this_cpu_add(memcg->stat->events[MEM_CGROUP_EVENTS_PGPGOUT], pgpgout); - __this_cpu_add(memcg->stat->nr_page_events, nr_pages); - memcg_check_events(memcg, dummy_page); -- local_irq_restore(flags); -+ local_unlock_irqrestore(event_lock, flags); - - if (!mem_cgroup_is_root(memcg)) - css_put_many(&memcg->css, nr_pages); -@@ -5554,10 +5560,10 @@ void mem_cgroup_migrate(struct page *oldpage, struct page *newpage) - - commit_charge(newpage, memcg, false); - -- local_irq_disable(); -+ local_lock_irq(event_lock); - mem_cgroup_charge_statistics(memcg, newpage, compound, nr_pages); - memcg_check_events(memcg, newpage); -- local_irq_enable(); -+ local_unlock_irq(event_lock); - } - - DEFINE_STATIC_KEY_FALSE(memcg_sockets_enabled_key); -@@ -5722,6 +5728,7 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry) - { - struct mem_cgroup *memcg; - unsigned short oldid; -+ unsigned long flags; - - VM_BUG_ON_PAGE(PageLRU(page), page); - VM_BUG_ON_PAGE(page_count(page), page); -@@ -5750,9 +5757,13 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry) - * important here to have the interrupts disabled because it is the - * only synchronisation we have for udpating the per-CPU variables. - */ -+ local_lock_irqsave(event_lock, flags); -+#ifndef CONFIG_PREEMPT_RT_BASE - VM_BUG_ON(!irqs_disabled()); -+#endif - mem_cgroup_charge_statistics(memcg, page, false, -1); - memcg_check_events(memcg, page); -+ local_unlock_irqrestore(event_lock, flags); - } - - /* -diff --git a/mm/mmu_context.c b/mm/mmu_context.c -index f802c2d216a7..b1b6f238e42d 100644 ---- a/mm/mmu_context.c -+++ b/mm/mmu_context.c -@@ -23,6 +23,7 @@ void use_mm(struct mm_struct *mm) - struct task_struct *tsk = current; - - task_lock(tsk); -+ preempt_disable_rt(); - active_mm = tsk->active_mm; - if (active_mm != mm) { - atomic_inc(&mm->mm_count); -@@ -30,6 +31,7 @@ void use_mm(struct mm_struct *mm) - } - tsk->mm = mm; - switch_mm(active_mm, mm, tsk); -+ preempt_enable_rt(); - task_unlock(tsk); - #ifdef finish_arch_post_lock_switch - finish_arch_post_lock_switch(); -diff --git a/mm/page_alloc.c b/mm/page_alloc.c -index 898fe3f909f9..301140302ff8 100644 ---- a/mm/page_alloc.c -+++ b/mm/page_alloc.c -@@ -61,6 +61,7 @@ - #include <linux/page_ext.h> - #include <linux/hugetlb.h> - #include <linux/sched/rt.h> -+#include <linux/locallock.h> - #include <linux/page_owner.h> - #include <linux/kthread.h> - -@@ -275,6 +276,18 @@ EXPORT_SYMBOL(nr_node_ids); - EXPORT_SYMBOL(nr_online_nodes); - #endif - -+static DEFINE_LOCAL_IRQ_LOCK(pa_lock); -+ -+#ifdef CONFIG_PREEMPT_RT_BASE -+# define cpu_lock_irqsave(cpu, flags) \ -+ local_lock_irqsave_on(pa_lock, flags, cpu) -+# define cpu_unlock_irqrestore(cpu, flags) \ -+ local_unlock_irqrestore_on(pa_lock, flags, cpu) -+#else -+# define cpu_lock_irqsave(cpu, flags) local_irq_save(flags) -+# define cpu_unlock_irqrestore(cpu, flags) local_irq_restore(flags) -+#endif -+ - int page_group_by_mobility_disabled __read_mostly; - - #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT -@@ -814,7 +827,7 @@ static inline int free_pages_check(struct page *page) - } - - /* -- * Frees a number of pages from the PCP lists -+ * Frees a number of pages which have been collected from the pcp lists. - * Assumes all pages on list are in same zone, and of same order. - * count is the number of pages to free. - * -@@ -825,18 +838,53 @@ static inline int free_pages_check(struct page *page) - * pinned" detection logic. - */ - static void free_pcppages_bulk(struct zone *zone, int count, -- struct per_cpu_pages *pcp) -+ struct list_head *list) - { -- int migratetype = 0; -- int batch_free = 0; - int to_free = count; - unsigned long nr_scanned; -+ unsigned long flags; -+ -+ spin_lock_irqsave(&zone->lock, flags); - -- spin_lock(&zone->lock); - nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED); - if (nr_scanned) - __mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned); - -+ while (!list_empty(list)) { -+ struct page *page = list_first_entry(list, struct page, lru); -+ int mt; /* migratetype of the to-be-freed page */ -+ -+ /* must delete as __free_one_page list manipulates */ -+ list_del(&page->lru); -+ -+ mt = get_pcppage_migratetype(page); -+ /* MIGRATE_ISOLATE page should not go to pcplists */ -+ VM_BUG_ON_PAGE(is_migrate_isolate(mt), page); -+ /* Pageblock could have been isolated meanwhile */ -+ if (unlikely(has_isolate_pageblock(zone))) -+ mt = get_pageblock_migratetype(page); -+ -+ __free_one_page(page, page_to_pfn(page), zone, 0, mt); -+ trace_mm_page_pcpu_drain(page, 0, mt); -+ to_free--; -+ } -+ WARN_ON(to_free != 0); -+ spin_unlock_irqrestore(&zone->lock, flags); -+} -+ -+/* -+ * Moves a number of pages from the PCP lists to free list which -+ * is freed outside of the locked region. -+ * -+ * Assumes all pages on list are in same zone, and of same order. -+ * count is the number of pages to free. -+ */ -+static void isolate_pcp_pages(int to_free, struct per_cpu_pages *src, -+ struct list_head *dst) -+{ -+ int migratetype = 0; -+ int batch_free = 0; -+ - while (to_free) { - struct page *page; - struct list_head *list; -@@ -852,7 +900,7 @@ static void free_pcppages_bulk(struct zone *zone, int count, - batch_free++; - if (++migratetype == MIGRATE_PCPTYPES) - migratetype = 0; -- list = &pcp->lists[migratetype]; -+ list = &src->lists[migratetype]; - } while (list_empty(list)); - - /* This is the only non-empty list. Free them all. */ -@@ -860,24 +908,12 @@ static void free_pcppages_bulk(struct zone *zone, int count, - batch_free = to_free; - - do { -- int mt; /* migratetype of the to-be-freed page */ -- - page = list_last_entry(list, struct page, lru); -- /* must delete as __free_one_page list manipulates */ - list_del(&page->lru); - -- mt = get_pcppage_migratetype(page); -- /* MIGRATE_ISOLATE page should not go to pcplists */ -- VM_BUG_ON_PAGE(is_migrate_isolate(mt), page); -- /* Pageblock could have been isolated meanwhile */ -- if (unlikely(has_isolate_pageblock(zone))) -- mt = get_pageblock_migratetype(page); -- -- __free_one_page(page, page_to_pfn(page), zone, 0, mt); -- trace_mm_page_pcpu_drain(page, 0, mt); -+ list_add(&page->lru, dst); - } while (--to_free && --batch_free && !list_empty(list)); - } -- spin_unlock(&zone->lock); - } - - static void free_one_page(struct zone *zone, -@@ -886,7 +922,9 @@ static void free_one_page(struct zone *zone, - int migratetype) - { - unsigned long nr_scanned; -- spin_lock(&zone->lock); -+ unsigned long flags; -+ -+ spin_lock_irqsave(&zone->lock, flags); - nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED); - if (nr_scanned) - __mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned); -@@ -896,7 +934,7 @@ static void free_one_page(struct zone *zone, - migratetype = get_pfnblock_migratetype(page, pfn); - } - __free_one_page(page, pfn, zone, order, migratetype); -- spin_unlock(&zone->lock); -+ spin_unlock_irqrestore(&zone->lock, flags); - } - - static int free_tail_pages_check(struct page *head_page, struct page *page) -@@ -1070,10 +1108,10 @@ static void __free_pages_ok(struct page *page, unsigned int order) - return; - - migratetype = get_pfnblock_migratetype(page, pfn); -- local_irq_save(flags); -+ local_lock_irqsave(pa_lock, flags); - __count_vm_events(PGFREE, 1 << order); - free_one_page(page_zone(page), page, pfn, order, migratetype); -- local_irq_restore(flags); -+ local_unlock_irqrestore(pa_lock, flags); - } - - static void __init __free_pages_boot_core(struct page *page, -@@ -2015,16 +2053,18 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order, - void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp) - { - unsigned long flags; -+ LIST_HEAD(dst); - int to_drain, batch; - -- local_irq_save(flags); -+ local_lock_irqsave(pa_lock, flags); - batch = READ_ONCE(pcp->batch); - to_drain = min(pcp->count, batch); - if (to_drain > 0) { -- free_pcppages_bulk(zone, to_drain, pcp); -+ isolate_pcp_pages(to_drain, pcp, &dst); - pcp->count -= to_drain; - } -- local_irq_restore(flags); -+ local_unlock_irqrestore(pa_lock, flags); -+ free_pcppages_bulk(zone, to_drain, &dst); - } - #endif - -@@ -2040,16 +2080,21 @@ static void drain_pages_zone(unsigned int cpu, struct zone *zone) - unsigned long flags; - struct per_cpu_pageset *pset; - struct per_cpu_pages *pcp; -+ LIST_HEAD(dst); -+ int count; - -- local_irq_save(flags); -+ cpu_lock_irqsave(cpu, flags); - pset = per_cpu_ptr(zone->pageset, cpu); - - pcp = &pset->pcp; -- if (pcp->count) { -- free_pcppages_bulk(zone, pcp->count, pcp); -+ count = pcp->count; -+ if (count) { -+ isolate_pcp_pages(count, pcp, &dst); - pcp->count = 0; - } -- local_irq_restore(flags); -+ cpu_unlock_irqrestore(cpu, flags); -+ if (count) -+ free_pcppages_bulk(zone, count, &dst); - } - - /* -@@ -2135,8 +2180,17 @@ void drain_all_pages(struct zone *zone) - else - cpumask_clear_cpu(cpu, &cpus_with_pcps); - } -+#ifndef CONFIG_PREEMPT_RT_BASE - on_each_cpu_mask(&cpus_with_pcps, (smp_call_func_t) drain_local_pages, - zone, 1); -+#else -+ for_each_cpu(cpu, &cpus_with_pcps) { -+ if (zone) -+ drain_pages_zone(cpu, zone); -+ else -+ drain_pages(cpu); -+ } -+#endif - } - - #ifdef CONFIG_HIBERNATION -@@ -2192,7 +2246,7 @@ void free_hot_cold_page(struct page *page, bool cold) - - migratetype = get_pfnblock_migratetype(page, pfn); - set_pcppage_migratetype(page, migratetype); -- local_irq_save(flags); -+ local_lock_irqsave(pa_lock, flags); - __count_vm_event(PGFREE); - - /* -@@ -2218,12 +2272,17 @@ void free_hot_cold_page(struct page *page, bool cold) - pcp->count++; - if (pcp->count >= pcp->high) { - unsigned long batch = READ_ONCE(pcp->batch); -- free_pcppages_bulk(zone, batch, pcp); -+ LIST_HEAD(dst); -+ -+ isolate_pcp_pages(batch, pcp, &dst); - pcp->count -= batch; -+ local_unlock_irqrestore(pa_lock, flags); -+ free_pcppages_bulk(zone, batch, &dst); -+ return; - } - - out: -- local_irq_restore(flags); -+ local_unlock_irqrestore(pa_lock, flags); - } - - /* -@@ -2358,7 +2417,7 @@ struct page *buffered_rmqueue(struct zone *preferred_zone, - struct per_cpu_pages *pcp; - struct list_head *list; - -- local_irq_save(flags); -+ local_lock_irqsave(pa_lock, flags); - pcp = &this_cpu_ptr(zone->pageset)->pcp; - list = &pcp->lists[migratetype]; - if (list_empty(list)) { -@@ -2382,7 +2441,7 @@ struct page *buffered_rmqueue(struct zone *preferred_zone, - * allocate greater than order-1 page units with __GFP_NOFAIL. - */ - WARN_ON_ONCE((gfp_flags & __GFP_NOFAIL) && (order > 1)); -- spin_lock_irqsave(&zone->lock, flags); -+ local_spin_lock_irqsave(pa_lock, &zone->lock, flags); - - page = NULL; - if (alloc_flags & ALLOC_HARDER) { -@@ -2392,11 +2451,13 @@ struct page *buffered_rmqueue(struct zone *preferred_zone, - } - if (!page) - page = __rmqueue(zone, order, migratetype); -- spin_unlock(&zone->lock); -- if (!page) -+ if (!page) { -+ spin_unlock(&zone->lock); - goto failed; -+ } - __mod_zone_freepage_state(zone, -(1 << order), - get_pcppage_migratetype(page)); -+ spin_unlock(&zone->lock); - } - - __mod_zone_page_state(zone, NR_ALLOC_BATCH, -(1 << order)); -@@ -2406,13 +2467,13 @@ struct page *buffered_rmqueue(struct zone *preferred_zone, - - __count_zone_vm_events(PGALLOC, zone, 1 << order); - zone_statistics(preferred_zone, zone, gfp_flags); -- local_irq_restore(flags); -+ local_unlock_irqrestore(pa_lock, flags); - - VM_BUG_ON_PAGE(bad_range(zone, page), page); - return page; - - failed: -- local_irq_restore(flags); -+ local_unlock_irqrestore(pa_lock, flags); - return NULL; - } - -@@ -6213,7 +6274,9 @@ static int page_alloc_cpu_notify(struct notifier_block *self, - int cpu = (unsigned long)hcpu; - - if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) { -+ local_lock_irq_on(swapvec_lock, cpu); - lru_add_drain_cpu(cpu); -+ local_unlock_irq_on(swapvec_lock, cpu); - drain_pages(cpu); - - /* -@@ -6239,6 +6302,7 @@ static int page_alloc_cpu_notify(struct notifier_block *self, - void __init page_alloc_init(void) - { - hotcpu_notifier(page_alloc_cpu_notify, 0); -+ local_irq_lock_init(pa_lock); - } - - /* -@@ -7163,7 +7227,7 @@ void zone_pcp_reset(struct zone *zone) - struct per_cpu_pageset *pset; - - /* avoid races with drain_pages() */ -- local_irq_save(flags); -+ local_lock_irqsave(pa_lock, flags); - if (zone->pageset != &boot_pageset) { - for_each_online_cpu(cpu) { - pset = per_cpu_ptr(zone->pageset, cpu); -@@ -7172,7 +7236,7 @@ void zone_pcp_reset(struct zone *zone) - free_percpu(zone->pageset); - zone->pageset = &boot_pageset; - } -- local_irq_restore(flags); -+ local_unlock_irqrestore(pa_lock, flags); - } - - #ifdef CONFIG_MEMORY_HOTREMOVE -diff --git a/mm/slab.h b/mm/slab.h -index 5969769fbee6..b85c60f6dba8 100644 ---- a/mm/slab.h -+++ b/mm/slab.h -@@ -415,7 +415,11 @@ static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags, - * The slab lists for all objects. - */ - struct kmem_cache_node { -+#ifdef CONFIG_SLUB -+ raw_spinlock_t list_lock; -+#else - spinlock_t list_lock; -+#endif - - #ifdef CONFIG_SLAB - struct list_head slabs_partial; /* partial list first, better asm code */ -diff --git a/mm/slub.c b/mm/slub.c -index 4dbb109eb8cd..2d10cc519150 100644 ---- a/mm/slub.c -+++ b/mm/slub.c -@@ -1143,7 +1143,7 @@ static noinline int free_debug_processing( - unsigned long uninitialized_var(flags); - int ret = 0; - -- spin_lock_irqsave(&n->list_lock, flags); -+ raw_spin_lock_irqsave(&n->list_lock, flags); - slab_lock(page); - - if (s->flags & SLAB_CONSISTENCY_CHECKS) { -@@ -1178,7 +1178,7 @@ static noinline int free_debug_processing( - bulk_cnt, cnt); - - slab_unlock(page); -- spin_unlock_irqrestore(&n->list_lock, flags); -+ raw_spin_unlock_irqrestore(&n->list_lock, flags); - if (!ret) - slab_fix(s, "Object at 0x%p not freed", object); - return ret; -@@ -1306,6 +1306,12 @@ static inline void dec_slabs_node(struct kmem_cache *s, int node, - - #endif /* CONFIG_SLUB_DEBUG */ - -+struct slub_free_list { -+ raw_spinlock_t lock; -+ struct list_head list; -+}; -+static DEFINE_PER_CPU(struct slub_free_list, slub_free_list); -+ - /* - * Hooks for other subsystems that check memory allocations. In a typical - * production configuration these hooks all should produce no code at all. -@@ -1412,10 +1418,17 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) - gfp_t alloc_gfp; - void *start, *p; - int idx, order; -+ bool enableirqs = false; - - flags &= gfp_allowed_mask; - - if (gfpflags_allow_blocking(flags)) -+ enableirqs = true; -+#ifdef CONFIG_PREEMPT_RT_FULL -+ if (system_state == SYSTEM_RUNNING) -+ enableirqs = true; -+#endif -+ if (enableirqs) - local_irq_enable(); - - flags |= s->allocflags; -@@ -1486,7 +1499,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) - page->frozen = 1; - - out: -- if (gfpflags_allow_blocking(flags)) -+ if (enableirqs) - local_irq_disable(); - if (!page) - return NULL; -@@ -1543,6 +1556,16 @@ static void __free_slab(struct kmem_cache *s, struct page *page) - __free_pages(page, order); - } - -+static void free_delayed(struct list_head *h) -+{ -+ while(!list_empty(h)) { -+ struct page *page = list_first_entry(h, struct page, lru); -+ -+ list_del(&page->lru); -+ __free_slab(page->slab_cache, page); -+ } -+} -+ - #define need_reserve_slab_rcu \ - (sizeof(((struct page *)NULL)->lru) < sizeof(struct rcu_head)) - -@@ -1574,6 +1597,12 @@ static void free_slab(struct kmem_cache *s, struct page *page) - } - - call_rcu(head, rcu_free_slab); -+ } else if (irqs_disabled()) { -+ struct slub_free_list *f = this_cpu_ptr(&slub_free_list); -+ -+ raw_spin_lock(&f->lock); -+ list_add(&page->lru, &f->list); -+ raw_spin_unlock(&f->lock); - } else - __free_slab(s, page); - } -@@ -1681,7 +1710,7 @@ static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n, - if (!n || !n->nr_partial) - return NULL; - -- spin_lock(&n->list_lock); -+ raw_spin_lock(&n->list_lock); - list_for_each_entry_safe(page, page2, &n->partial, lru) { - void *t; - -@@ -1706,7 +1735,7 @@ static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n, - break; - - } -- spin_unlock(&n->list_lock); -+ raw_spin_unlock(&n->list_lock); - return object; - } - -@@ -1952,7 +1981,7 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page, - * that acquire_slab() will see a slab page that - * is frozen - */ -- spin_lock(&n->list_lock); -+ raw_spin_lock(&n->list_lock); - } - } else { - m = M_FULL; -@@ -1963,7 +1992,7 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page, - * slabs from diagnostic functions will not see - * any frozen slabs. - */ -- spin_lock(&n->list_lock); -+ raw_spin_lock(&n->list_lock); - } - } - -@@ -1998,7 +2027,7 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page, - goto redo; - - if (lock) -- spin_unlock(&n->list_lock); -+ raw_spin_unlock(&n->list_lock); - - if (m == M_FREE) { - stat(s, DEACTIVATE_EMPTY); -@@ -2030,10 +2059,10 @@ static void unfreeze_partials(struct kmem_cache *s, - n2 = get_node(s, page_to_nid(page)); - if (n != n2) { - if (n) -- spin_unlock(&n->list_lock); -+ raw_spin_unlock(&n->list_lock); - - n = n2; -- spin_lock(&n->list_lock); -+ raw_spin_lock(&n->list_lock); - } - - do { -@@ -2062,7 +2091,7 @@ static void unfreeze_partials(struct kmem_cache *s, - } - - if (n) -- spin_unlock(&n->list_lock); -+ raw_spin_unlock(&n->list_lock); - - while (discard_page) { - page = discard_page; -@@ -2101,14 +2130,21 @@ static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain) - pobjects = oldpage->pobjects; - pages = oldpage->pages; - if (drain && pobjects > s->cpu_partial) { -+ struct slub_free_list *f; - unsigned long flags; -+ LIST_HEAD(tofree); - /* - * partial array is full. Move the existing - * set to the per node partial list. - */ - local_irq_save(flags); - unfreeze_partials(s, this_cpu_ptr(s->cpu_slab)); -+ f = this_cpu_ptr(&slub_free_list); -+ raw_spin_lock(&f->lock); -+ list_splice_init(&f->list, &tofree); -+ raw_spin_unlock(&f->lock); - local_irq_restore(flags); -+ free_delayed(&tofree); - oldpage = NULL; - pobjects = 0; - pages = 0; -@@ -2180,7 +2216,22 @@ static bool has_cpu_slab(int cpu, void *info) - - static void flush_all(struct kmem_cache *s) - { -+ LIST_HEAD(tofree); -+ int cpu; -+ - on_each_cpu_cond(has_cpu_slab, flush_cpu_slab, s, 1, GFP_ATOMIC); -+ for_each_online_cpu(cpu) { -+ struct slub_free_list *f; -+ -+ if (!has_cpu_slab(cpu, s)) -+ continue; -+ -+ f = &per_cpu(slub_free_list, cpu); -+ raw_spin_lock_irq(&f->lock); -+ list_splice_init(&f->list, &tofree); -+ raw_spin_unlock_irq(&f->lock); -+ free_delayed(&tofree); -+ } - } - - /* -@@ -2216,10 +2267,10 @@ static unsigned long count_partial(struct kmem_cache_node *n, - unsigned long x = 0; - struct page *page; - -- spin_lock_irqsave(&n->list_lock, flags); -+ raw_spin_lock_irqsave(&n->list_lock, flags); - list_for_each_entry(page, &n->partial, lru) - x += get_count(page); -- spin_unlock_irqrestore(&n->list_lock, flags); -+ raw_spin_unlock_irqrestore(&n->list_lock, flags); - return x; - } - #endif /* CONFIG_SLUB_DEBUG || CONFIG_SYSFS */ -@@ -2357,8 +2408,10 @@ static inline void *get_freelist(struct kmem_cache *s, struct page *page) - * already disabled (which is the case for bulk allocation). - */ - static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, -- unsigned long addr, struct kmem_cache_cpu *c) -+ unsigned long addr, struct kmem_cache_cpu *c, -+ struct list_head *to_free) - { -+ struct slub_free_list *f; - void *freelist; - struct page *page; - -@@ -2418,6 +2471,13 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, - VM_BUG_ON(!c->page->frozen); - c->freelist = get_freepointer(s, freelist); - c->tid = next_tid(c->tid); -+ -+out: -+ f = this_cpu_ptr(&slub_free_list); -+ raw_spin_lock(&f->lock); -+ list_splice_init(&f->list, to_free); -+ raw_spin_unlock(&f->lock); -+ - return freelist; - - new_slab: -@@ -2449,7 +2509,7 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, - deactivate_slab(s, page, get_freepointer(s, freelist)); - c->page = NULL; - c->freelist = NULL; -- return freelist; -+ goto out; - } - - /* -@@ -2461,6 +2521,7 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, - { - void *p; - unsigned long flags; -+ LIST_HEAD(tofree); - - local_irq_save(flags); - #ifdef CONFIG_PREEMPT -@@ -2472,8 +2533,9 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, - c = this_cpu_ptr(s->cpu_slab); - #endif - -- p = ___slab_alloc(s, gfpflags, node, addr, c); -+ p = ___slab_alloc(s, gfpflags, node, addr, c, &tofree); - local_irq_restore(flags); -+ free_delayed(&tofree); - return p; - } - -@@ -2659,7 +2721,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page, - - do { - if (unlikely(n)) { -- spin_unlock_irqrestore(&n->list_lock, flags); -+ raw_spin_unlock_irqrestore(&n->list_lock, flags); - n = NULL; - } - prior = page->freelist; -@@ -2691,7 +2753,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page, - * Otherwise the list_lock will synchronize with - * other processors updating the list of slabs. - */ -- spin_lock_irqsave(&n->list_lock, flags); -+ raw_spin_lock_irqsave(&n->list_lock, flags); - - } - } -@@ -2733,7 +2795,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page, - add_partial(n, page, DEACTIVATE_TO_TAIL); - stat(s, FREE_ADD_PARTIAL); - } -- spin_unlock_irqrestore(&n->list_lock, flags); -+ raw_spin_unlock_irqrestore(&n->list_lock, flags); - return; - - slab_empty: -@@ -2748,7 +2810,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page, - remove_full(s, n, page); - } - -- spin_unlock_irqrestore(&n->list_lock, flags); -+ raw_spin_unlock_irqrestore(&n->list_lock, flags); - stat(s, FREE_SLAB); - discard_slab(s, page); - } -@@ -2935,6 +2997,7 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size, - void **p) - { - struct kmem_cache_cpu *c; -+ LIST_HEAD(to_free); - int i; - - /* memcg and kmem_cache debug support */ -@@ -2958,7 +3021,7 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size, - * of re-populating per CPU c->freelist - */ - p[i] = ___slab_alloc(s, flags, NUMA_NO_NODE, -- _RET_IP_, c); -+ _RET_IP_, c, &to_free); - if (unlikely(!p[i])) - goto error; - -@@ -2970,6 +3033,7 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size, - } - c->tid = next_tid(c->tid); - local_irq_enable(); -+ free_delayed(&to_free); - - /* Clear memory outside IRQ disabled fastpath loop */ - if (unlikely(flags & __GFP_ZERO)) { -@@ -3117,7 +3181,7 @@ static void - init_kmem_cache_node(struct kmem_cache_node *n) - { - n->nr_partial = 0; -- spin_lock_init(&n->list_lock); -+ raw_spin_lock_init(&n->list_lock); - INIT_LIST_HEAD(&n->partial); - #ifdef CONFIG_SLUB_DEBUG - atomic_long_set(&n->nr_slabs, 0); -@@ -3450,6 +3514,10 @@ static void list_slab_objects(struct kmem_cache *s, struct page *page, - const char *text) - { - #ifdef CONFIG_SLUB_DEBUG -+#ifdef CONFIG_PREEMPT_RT_BASE -+ /* XXX move out of irq-off section */ -+ slab_err(s, page, text, s->name); -+#else - void *addr = page_address(page); - void *p; - unsigned long *map = kzalloc(BITS_TO_LONGS(page->objects) * -@@ -3470,6 +3538,7 @@ static void list_slab_objects(struct kmem_cache *s, struct page *page, - slab_unlock(page); - kfree(map); - #endif -+#endif - } - - /* -@@ -3482,7 +3551,7 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n) - struct page *page, *h; - - BUG_ON(irqs_disabled()); -- spin_lock_irq(&n->list_lock); -+ raw_spin_lock_irq(&n->list_lock); - list_for_each_entry_safe(page, h, &n->partial, lru) { - if (!page->inuse) { - remove_partial(n, page); -@@ -3492,7 +3561,7 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n) - "Objects remaining in %s on __kmem_cache_shutdown()"); - } - } -- spin_unlock_irq(&n->list_lock); -+ raw_spin_unlock_irq(&n->list_lock); - } - - /* -@@ -3706,7 +3775,7 @@ int __kmem_cache_shrink(struct kmem_cache *s, bool deactivate) - for (i = 0; i < SHRINK_PROMOTE_MAX; i++) - INIT_LIST_HEAD(promote + i); - -- spin_lock_irqsave(&n->list_lock, flags); -+ raw_spin_lock_irqsave(&n->list_lock, flags); - - /* - * Build lists of slabs to discard or promote. -@@ -3737,7 +3806,7 @@ int __kmem_cache_shrink(struct kmem_cache *s, bool deactivate) - for (i = SHRINK_PROMOTE_MAX - 1; i >= 0; i--) - list_splice(promote + i, &n->partial); - -- spin_unlock_irqrestore(&n->list_lock, flags); -+ raw_spin_unlock_irqrestore(&n->list_lock, flags); - - /* Release empty slabs */ - list_for_each_entry_safe(page, t, &discard, lru) -@@ -3913,6 +3982,12 @@ void __init kmem_cache_init(void) - { - static __initdata struct kmem_cache boot_kmem_cache, - boot_kmem_cache_node; -+ int cpu; -+ -+ for_each_possible_cpu(cpu) { -+ raw_spin_lock_init(&per_cpu(slub_free_list, cpu).lock); -+ INIT_LIST_HEAD(&per_cpu(slub_free_list, cpu).list); -+ } - - if (debug_guardpage_minorder()) - slub_max_order = 0; -@@ -4156,7 +4231,7 @@ static int validate_slab_node(struct kmem_cache *s, - struct page *page; - unsigned long flags; - -- spin_lock_irqsave(&n->list_lock, flags); -+ raw_spin_lock_irqsave(&n->list_lock, flags); - - list_for_each_entry(page, &n->partial, lru) { - validate_slab_slab(s, page, map); -@@ -4178,7 +4253,7 @@ static int validate_slab_node(struct kmem_cache *s, - s->name, count, atomic_long_read(&n->nr_slabs)); - - out: -- spin_unlock_irqrestore(&n->list_lock, flags); -+ raw_spin_unlock_irqrestore(&n->list_lock, flags); - return count; - } - -@@ -4366,12 +4441,12 @@ static int list_locations(struct kmem_cache *s, char *buf, - if (!atomic_long_read(&n->nr_slabs)) - continue; - -- spin_lock_irqsave(&n->list_lock, flags); -+ raw_spin_lock_irqsave(&n->list_lock, flags); - list_for_each_entry(page, &n->partial, lru) - process_slab(&t, s, page, alloc, map); - list_for_each_entry(page, &n->full, lru) - process_slab(&t, s, page, alloc, map); -- spin_unlock_irqrestore(&n->list_lock, flags); -+ raw_spin_unlock_irqrestore(&n->list_lock, flags); - } - - for (i = 0; i < t.count; i++) { -diff --git a/mm/swap.c b/mm/swap.c -index 03aacbcb013f..d3558eb2f685 100644 ---- a/mm/swap.c -+++ b/mm/swap.c -@@ -32,6 +32,7 @@ - #include <linux/memcontrol.h> - #include <linux/gfp.h> - #include <linux/uio.h> -+#include <linux/locallock.h> - #include <linux/hugetlb.h> - #include <linux/page_idle.h> - -@@ -48,6 +49,9 @@ static DEFINE_PER_CPU(struct pagevec, lru_rotate_pvecs); - static DEFINE_PER_CPU(struct pagevec, lru_deactivate_file_pvecs); - static DEFINE_PER_CPU(struct pagevec, lru_deactivate_pvecs); - -+static DEFINE_LOCAL_IRQ_LOCK(rotate_lock); -+DEFINE_LOCAL_IRQ_LOCK(swapvec_lock); -+ - /* - * This path almost never happens for VM activity - pages are normally - * freed via pagevecs. But it gets used by networking. -@@ -237,11 +241,11 @@ void rotate_reclaimable_page(struct page *page) - unsigned long flags; - - get_page(page); -- local_irq_save(flags); -+ local_lock_irqsave(rotate_lock, flags); - pvec = this_cpu_ptr(&lru_rotate_pvecs); - if (!pagevec_add(pvec, page)) - pagevec_move_tail(pvec); -- local_irq_restore(flags); -+ local_unlock_irqrestore(rotate_lock, flags); - } - } - -@@ -292,12 +296,13 @@ static bool need_activate_page_drain(int cpu) - void activate_page(struct page *page) - { - if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) { -- struct pagevec *pvec = &get_cpu_var(activate_page_pvecs); -+ struct pagevec *pvec = &get_locked_var(swapvec_lock, -+ activate_page_pvecs); - - get_page(page); - if (!pagevec_add(pvec, page)) - pagevec_lru_move_fn(pvec, __activate_page, NULL); -- put_cpu_var(activate_page_pvecs); -+ put_locked_var(swapvec_lock, activate_page_pvecs); - } - } - -@@ -323,7 +328,7 @@ void activate_page(struct page *page) - - static void __lru_cache_activate_page(struct page *page) - { -- struct pagevec *pvec = &get_cpu_var(lru_add_pvec); -+ struct pagevec *pvec = &get_locked_var(swapvec_lock, lru_add_pvec); - int i; - - /* -@@ -345,7 +350,7 @@ static void __lru_cache_activate_page(struct page *page) - } - } - -- put_cpu_var(lru_add_pvec); -+ put_locked_var(swapvec_lock, lru_add_pvec); - } - - /* -@@ -387,13 +392,13 @@ EXPORT_SYMBOL(mark_page_accessed); - - static void __lru_cache_add(struct page *page) - { -- struct pagevec *pvec = &get_cpu_var(lru_add_pvec); -+ struct pagevec *pvec = &get_locked_var(swapvec_lock, lru_add_pvec); - - get_page(page); - if (!pagevec_space(pvec)) - __pagevec_lru_add(pvec); - pagevec_add(pvec, page); -- put_cpu_var(lru_add_pvec); -+ put_locked_var(swapvec_lock, lru_add_pvec); - } - - /** -@@ -591,9 +596,15 @@ void lru_add_drain_cpu(int cpu) - unsigned long flags; - - /* No harm done if a racing interrupt already did this */ -- local_irq_save(flags); -+#ifdef CONFIG_PREEMPT_RT_BASE -+ local_lock_irqsave_on(rotate_lock, flags, cpu); - pagevec_move_tail(pvec); -- local_irq_restore(flags); -+ local_unlock_irqrestore_on(rotate_lock, flags, cpu); -+#else -+ local_lock_irqsave(rotate_lock, flags); -+ pagevec_move_tail(pvec); -+ local_unlock_irqrestore(rotate_lock, flags); -+#endif - } - - pvec = &per_cpu(lru_deactivate_file_pvecs, cpu); -@@ -625,11 +636,12 @@ void deactivate_file_page(struct page *page) - return; - - if (likely(get_page_unless_zero(page))) { -- struct pagevec *pvec = &get_cpu_var(lru_deactivate_file_pvecs); -+ struct pagevec *pvec = &get_locked_var(swapvec_lock, -+ lru_deactivate_file_pvecs); - - if (!pagevec_add(pvec, page)) - pagevec_lru_move_fn(pvec, lru_deactivate_file_fn, NULL); -- put_cpu_var(lru_deactivate_file_pvecs); -+ put_locked_var(swapvec_lock, lru_deactivate_file_pvecs); - } - } - -@@ -644,27 +656,48 @@ void deactivate_file_page(struct page *page) - void deactivate_page(struct page *page) - { - if (PageLRU(page) && PageActive(page) && !PageUnevictable(page)) { -- struct pagevec *pvec = &get_cpu_var(lru_deactivate_pvecs); -+ struct pagevec *pvec = &get_locked_var(swapvec_lock, -+ lru_deactivate_pvecs); - - get_page(page); - if (!pagevec_add(pvec, page)) - pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL); -- put_cpu_var(lru_deactivate_pvecs); -+ put_locked_var(swapvec_lock, lru_deactivate_pvecs); - } - } - - void lru_add_drain(void) - { -- lru_add_drain_cpu(get_cpu()); -- put_cpu(); -+ lru_add_drain_cpu(local_lock_cpu(swapvec_lock)); -+ local_unlock_cpu(swapvec_lock); - } - -+ -+#ifdef CONFIG_PREEMPT_RT_BASE -+static inline void remote_lru_add_drain(int cpu, struct cpumask *has_work) -+{ -+ local_lock_on(swapvec_lock, cpu); -+ lru_add_drain_cpu(cpu); -+ local_unlock_on(swapvec_lock, cpu); -+} -+ -+#else -+ - static void lru_add_drain_per_cpu(struct work_struct *dummy) - { - lru_add_drain(); - } - - static DEFINE_PER_CPU(struct work_struct, lru_add_drain_work); -+static inline void remote_lru_add_drain(int cpu, struct cpumask *has_work) -+{ -+ struct work_struct *work = &per_cpu(lru_add_drain_work, cpu); -+ -+ INIT_WORK(work, lru_add_drain_per_cpu); -+ schedule_work_on(cpu, work); -+ cpumask_set_cpu(cpu, has_work); -+} -+#endif - - void lru_add_drain_all(void) - { -@@ -677,21 +710,18 @@ void lru_add_drain_all(void) - cpumask_clear(&has_work); - - for_each_online_cpu(cpu) { -- struct work_struct *work = &per_cpu(lru_add_drain_work, cpu); -- - if (pagevec_count(&per_cpu(lru_add_pvec, cpu)) || - pagevec_count(&per_cpu(lru_rotate_pvecs, cpu)) || - pagevec_count(&per_cpu(lru_deactivate_file_pvecs, cpu)) || - pagevec_count(&per_cpu(lru_deactivate_pvecs, cpu)) || -- need_activate_page_drain(cpu)) { -- INIT_WORK(work, lru_add_drain_per_cpu); -- schedule_work_on(cpu, work); -- cpumask_set_cpu(cpu, &has_work); -- } -+ need_activate_page_drain(cpu)) -+ remote_lru_add_drain(cpu, &has_work); - } - -+#ifndef CONFIG_PREEMPT_RT_BASE - for_each_cpu(cpu, &has_work) - flush_work(&per_cpu(lru_add_drain_work, cpu)); -+#endif - - put_online_cpus(); - mutex_unlock(&lock); -diff --git a/mm/truncate.c b/mm/truncate.c -index b00272810871..dcc445a87dfe 100644 ---- a/mm/truncate.c -+++ b/mm/truncate.c -@@ -63,9 +63,12 @@ static void clear_exceptional_entry(struct address_space *mapping, - * protected by mapping->tree_lock. - */ - if (!workingset_node_shadows(node) && -- !list_empty(&node->private_list)) -- list_lru_del(&workingset_shadow_nodes, -+ !list_empty(&node->private_list)) { -+ local_lock(workingset_shadow_lock); -+ list_lru_del(&__workingset_shadow_nodes, - &node->private_list); -+ local_unlock(workingset_shadow_lock); -+ } - __radix_tree_delete_node(&mapping->page_tree, node); - } - unlock: -diff --git a/mm/vmalloc.c b/mm/vmalloc.c -index ae7d20b447ff..b7d6f721c2a7 100644 ---- a/mm/vmalloc.c -+++ b/mm/vmalloc.c -@@ -819,7 +819,7 @@ static void *new_vmap_block(unsigned int order, gfp_t gfp_mask) - struct vmap_block *vb; - struct vmap_area *va; - unsigned long vb_idx; -- int node, err; -+ int node, err, cpu; - void *vaddr; - - node = numa_node_id(); -@@ -862,11 +862,12 @@ static void *new_vmap_block(unsigned int order, gfp_t gfp_mask) - BUG_ON(err); - radix_tree_preload_end(); - -- vbq = &get_cpu_var(vmap_block_queue); -+ cpu = get_cpu_light(); -+ vbq = this_cpu_ptr(&vmap_block_queue); - spin_lock(&vbq->lock); - list_add_tail_rcu(&vb->free_list, &vbq->free); - spin_unlock(&vbq->lock); -- put_cpu_var(vmap_block_queue); -+ put_cpu_light(); - - return vaddr; - } -@@ -935,6 +936,7 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask) - struct vmap_block *vb; - void *vaddr = NULL; - unsigned int order; -+ int cpu; - - BUG_ON(offset_in_page(size)); - BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC); -@@ -949,7 +951,8 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask) - order = get_order(size); - - rcu_read_lock(); -- vbq = &get_cpu_var(vmap_block_queue); -+ cpu = get_cpu_light(); -+ vbq = this_cpu_ptr(&vmap_block_queue); - list_for_each_entry_rcu(vb, &vbq->free, free_list) { - unsigned long pages_off; - -@@ -972,7 +975,7 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask) - break; - } - -- put_cpu_var(vmap_block_queue); -+ put_cpu_light(); - rcu_read_unlock(); - - /* Allocate new block if nothing was found */ -diff --git a/mm/vmstat.c b/mm/vmstat.c -index 5e4300482897..1ae743192c66 100644 ---- a/mm/vmstat.c -+++ b/mm/vmstat.c -@@ -226,6 +226,7 @@ void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, - long x; - long t; - -+ preempt_disable_rt(); - x = delta + __this_cpu_read(*p); - - t = __this_cpu_read(pcp->stat_threshold); -@@ -235,6 +236,7 @@ void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, - x = 0; - } - __this_cpu_write(*p, x); -+ preempt_enable_rt(); - } - EXPORT_SYMBOL(__mod_zone_page_state); - -@@ -267,6 +269,7 @@ void __inc_zone_state(struct zone *zone, enum zone_stat_item item) - s8 __percpu *p = pcp->vm_stat_diff + item; - s8 v, t; - -+ preempt_disable_rt(); - v = __this_cpu_inc_return(*p); - t = __this_cpu_read(pcp->stat_threshold); - if (unlikely(v > t)) { -@@ -275,6 +278,7 @@ void __inc_zone_state(struct zone *zone, enum zone_stat_item item) - zone_page_state_add(v + overstep, zone, item); - __this_cpu_write(*p, -overstep); - } -+ preempt_enable_rt(); - } - - void __inc_zone_page_state(struct page *page, enum zone_stat_item item) -@@ -289,6 +293,7 @@ void __dec_zone_state(struct zone *zone, enum zone_stat_item item) - s8 __percpu *p = pcp->vm_stat_diff + item; - s8 v, t; - -+ preempt_disable_rt(); - v = __this_cpu_dec_return(*p); - t = __this_cpu_read(pcp->stat_threshold); - if (unlikely(v < - t)) { -@@ -297,6 +302,7 @@ void __dec_zone_state(struct zone *zone, enum zone_stat_item item) - zone_page_state_add(v - overstep, zone, item); - __this_cpu_write(*p, overstep); - } -+ preempt_enable_rt(); - } - - void __dec_zone_page_state(struct page *page, enum zone_stat_item item) -diff --git a/mm/workingset.c b/mm/workingset.c -index 8a75f8d2916a..00a38f9f0f37 100644 ---- a/mm/workingset.c -+++ b/mm/workingset.c -@@ -335,7 +335,8 @@ void workingset_activation(struct page *page) - * point where they would still be useful. - */ - --struct list_lru workingset_shadow_nodes; -+struct list_lru __workingset_shadow_nodes; -+DEFINE_LOCAL_IRQ_LOCK(workingset_shadow_lock); - - static unsigned long count_shadow_nodes(struct shrinker *shrinker, - struct shrink_control *sc) -@@ -345,9 +346,9 @@ static unsigned long count_shadow_nodes(struct shrinker *shrinker, - unsigned long pages; - - /* list_lru lock nests inside IRQ-safe mapping->tree_lock */ -- local_irq_disable(); -- shadow_nodes = list_lru_shrink_count(&workingset_shadow_nodes, sc); -- local_irq_enable(); -+ local_lock_irq(workingset_shadow_lock); -+ shadow_nodes = list_lru_shrink_count(&__workingset_shadow_nodes, sc); -+ local_unlock_irq(workingset_shadow_lock); - - if (memcg_kmem_enabled()) - pages = mem_cgroup_node_nr_lru_pages(sc->memcg, sc->nid, -@@ -440,9 +441,9 @@ static enum lru_status shadow_lru_isolate(struct list_head *item, - spin_unlock(&mapping->tree_lock); - ret = LRU_REMOVED_RETRY; - out: -- local_irq_enable(); -+ local_unlock_irq(workingset_shadow_lock); - cond_resched(); -- local_irq_disable(); -+ local_lock_irq(workingset_shadow_lock); - spin_lock(lru_lock); - return ret; - } -@@ -453,10 +454,10 @@ static unsigned long scan_shadow_nodes(struct shrinker *shrinker, - unsigned long ret; - - /* list_lru lock nests inside IRQ-safe mapping->tree_lock */ -- local_irq_disable(); -- ret = list_lru_shrink_walk(&workingset_shadow_nodes, sc, -+ local_lock_irq(workingset_shadow_lock); -+ ret = list_lru_shrink_walk(&__workingset_shadow_nodes, sc, - shadow_lru_isolate, NULL); -- local_irq_enable(); -+ local_unlock_irq(workingset_shadow_lock); - return ret; - } - -@@ -494,7 +495,7 @@ static int __init workingset_init(void) - printk("workingset: timestamp_bits=%d max_order=%d bucket_order=%u\n", - timestamp_bits, max_order, bucket_order); - -- ret = list_lru_init_key(&workingset_shadow_nodes, &shadow_nodes_key); -+ ret = list_lru_init_key(&__workingset_shadow_nodes, &shadow_nodes_key); - if (ret) - goto err; - ret = register_shrinker(&workingset_shadow_shrinker); -@@ -502,7 +503,7 @@ static int __init workingset_init(void) - goto err_list_lru; - return 0; - err_list_lru: -- list_lru_destroy(&workingset_shadow_nodes); -+ list_lru_destroy(&__workingset_shadow_nodes); - err: - return ret; - } -diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c -index fe47fbba995a..e46d7bcf562e 100644 ---- a/mm/zsmalloc.c -+++ b/mm/zsmalloc.c -@@ -1292,7 +1292,7 @@ void *zs_map_object(struct zs_pool *pool, unsigned long handle, - class = pool->size_class[class_idx]; - off = obj_idx_to_offset(page, obj_idx, class->size); - -- area = &get_cpu_var(zs_map_area); -+ area = per_cpu_ptr(&zs_map_area, get_cpu_light()); - area->vm_mm = mm; - if (off + class->size <= PAGE_SIZE) { - /* this object is contained entirely within a page */ -@@ -1345,7 +1345,7 @@ void zs_unmap_object(struct zs_pool *pool, unsigned long handle) - - __zs_unmap_object(area, pages, off, class->size); - } -- put_cpu_var(zs_map_area); -+ put_cpu_light(); - unpin_tag(handle); - } - EXPORT_SYMBOL_GPL(zs_unmap_object); -diff --git a/net/core/dev.c b/net/core/dev.c -index 5c925ac50b95..a8fedf89eb12 100644 ---- a/net/core/dev.c -+++ b/net/core/dev.c -@@ -188,6 +188,7 @@ static unsigned int napi_gen_id = NR_CPUS; - static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8); - - static seqcount_t devnet_rename_seq; -+static DEFINE_MUTEX(devnet_rename_mutex); - - static inline void dev_base_seq_inc(struct net *net) - { -@@ -209,14 +210,14 @@ static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) - static inline void rps_lock(struct softnet_data *sd) - { - #ifdef CONFIG_RPS -- spin_lock(&sd->input_pkt_queue.lock); -+ raw_spin_lock(&sd->input_pkt_queue.raw_lock); - #endif - } - - static inline void rps_unlock(struct softnet_data *sd) - { - #ifdef CONFIG_RPS -- spin_unlock(&sd->input_pkt_queue.lock); -+ raw_spin_unlock(&sd->input_pkt_queue.raw_lock); - #endif - } - -@@ -886,7 +887,8 @@ int netdev_get_name(struct net *net, char *name, int ifindex) - strcpy(name, dev->name); - rcu_read_unlock(); - if (read_seqcount_retry(&devnet_rename_seq, seq)) { -- cond_resched(); -+ mutex_lock(&devnet_rename_mutex); -+ mutex_unlock(&devnet_rename_mutex); - goto retry; - } - -@@ -1155,20 +1157,17 @@ int dev_change_name(struct net_device *dev, const char *newname) - if (dev->flags & IFF_UP) - return -EBUSY; - -- write_seqcount_begin(&devnet_rename_seq); -+ mutex_lock(&devnet_rename_mutex); -+ __raw_write_seqcount_begin(&devnet_rename_seq); - -- if (strncmp(newname, dev->name, IFNAMSIZ) == 0) { -- write_seqcount_end(&devnet_rename_seq); -- return 0; -- } -+ if (strncmp(newname, dev->name, IFNAMSIZ) == 0) -+ goto outunlock; - - memcpy(oldname, dev->name, IFNAMSIZ); - - err = dev_get_valid_name(net, dev, newname); -- if (err < 0) { -- write_seqcount_end(&devnet_rename_seq); -- return err; -- } -+ if (err < 0) -+ goto outunlock; - - if (oldname[0] && !strchr(oldname, '%')) - netdev_info(dev, "renamed from %s\n", oldname); -@@ -1181,11 +1180,12 @@ int dev_change_name(struct net_device *dev, const char *newname) - if (ret) { - memcpy(dev->name, oldname, IFNAMSIZ); - dev->name_assign_type = old_assign_type; -- write_seqcount_end(&devnet_rename_seq); -- return ret; -+ err = ret; -+ goto outunlock; - } - -- write_seqcount_end(&devnet_rename_seq); -+ __raw_write_seqcount_end(&devnet_rename_seq); -+ mutex_unlock(&devnet_rename_mutex); - - netdev_adjacent_rename_links(dev, oldname); - -@@ -1206,7 +1206,8 @@ int dev_change_name(struct net_device *dev, const char *newname) - /* err >= 0 after dev_alloc_name() or stores the first errno */ - if (err >= 0) { - err = ret; -- write_seqcount_begin(&devnet_rename_seq); -+ mutex_lock(&devnet_rename_mutex); -+ __raw_write_seqcount_begin(&devnet_rename_seq); - memcpy(dev->name, oldname, IFNAMSIZ); - memcpy(oldname, newname, IFNAMSIZ); - dev->name_assign_type = old_assign_type; -@@ -1219,6 +1220,11 @@ int dev_change_name(struct net_device *dev, const char *newname) - } - - return err; -+ -+outunlock: -+ __raw_write_seqcount_end(&devnet_rename_seq); -+ mutex_unlock(&devnet_rename_mutex); -+ return err; - } - - /** -@@ -2264,6 +2270,7 @@ static inline void __netif_reschedule(struct Qdisc *q) - sd->output_queue_tailp = &q->next_sched; - raise_softirq_irqoff(NET_TX_SOFTIRQ); - local_irq_restore(flags); -+ preempt_check_resched_rt(); - } - - void __netif_schedule(struct Qdisc *q) -@@ -2345,6 +2352,7 @@ void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason) - __this_cpu_write(softnet_data.completion_queue, skb); - raise_softirq_irqoff(NET_TX_SOFTIRQ); - local_irq_restore(flags); -+ preempt_check_resched_rt(); - } - EXPORT_SYMBOL(__dev_kfree_skb_irq); - -@@ -3035,7 +3043,11 @@ static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, - * This permits __QDISC___STATE_RUNNING owner to get the lock more - * often and dequeue packets faster. - */ -+#ifdef CONFIG_PREEMPT_RT_FULL -+ contended = true; -+#else - contended = qdisc_is_running(q); -+#endif - if (unlikely(contended)) - spin_lock(&q->busylock); - -@@ -3096,9 +3108,44 @@ static void skb_update_prio(struct sk_buff *skb) - #define skb_update_prio(skb) - #endif - -+#ifdef CONFIG_PREEMPT_RT_FULL -+ -+static inline int xmit_rec_read(void) -+{ -+ return current->xmit_recursion; -+} -+ -+static inline void xmit_rec_inc(void) -+{ -+ current->xmit_recursion++; -+} -+ -+static inline void xmit_rec_dec(void) -+{ -+ current->xmit_recursion--; -+} -+ -+#else -+ - DEFINE_PER_CPU(int, xmit_recursion); - EXPORT_SYMBOL(xmit_recursion); - -+static inline int xmit_rec_read(void) -+{ -+ return __this_cpu_read(xmit_recursion); -+} -+ -+static inline void xmit_rec_inc(void) -+{ -+ __this_cpu_inc(xmit_recursion); -+} -+ -+static inline void xmit_rec_dec(void) -+{ -+ __this_cpu_dec(xmit_recursion); -+} -+#endif -+ - #define RECURSION_LIMIT 10 - - /** -@@ -3344,7 +3391,7 @@ static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv) - - if (txq->xmit_lock_owner != cpu) { - -- if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT) -+ if (xmit_rec_read() > RECURSION_LIMIT) - goto recursion_alert; - - skb = validate_xmit_skb(skb, dev); -@@ -3354,9 +3401,9 @@ static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv) - HARD_TX_LOCK(dev, txq, cpu); - - if (!netif_xmit_stopped(txq)) { -- __this_cpu_inc(xmit_recursion); -+ xmit_rec_inc(); - skb = dev_hard_start_xmit(skb, dev, txq, &rc); -- __this_cpu_dec(xmit_recursion); -+ xmit_rec_dec(); - if (dev_xmit_complete(rc)) { - HARD_TX_UNLOCK(dev, txq); - goto out; -@@ -3730,6 +3777,7 @@ static int enqueue_to_backlog(struct sk_buff *skb, int cpu, - rps_unlock(sd); - - local_irq_restore(flags); -+ preempt_check_resched_rt(); - - atomic_long_inc(&skb->dev->rx_dropped); - kfree_skb(skb); -@@ -3748,7 +3796,7 @@ static int netif_rx_internal(struct sk_buff *skb) - struct rps_dev_flow voidflow, *rflow = &voidflow; - int cpu; - -- preempt_disable(); -+ migrate_disable(); - rcu_read_lock(); - - cpu = get_rps_cpu(skb->dev, skb, &rflow); -@@ -3758,13 +3806,13 @@ static int netif_rx_internal(struct sk_buff *skb) - ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); - - rcu_read_unlock(); -- preempt_enable(); -+ migrate_enable(); - } else - #endif - { - unsigned int qtail; -- ret = enqueue_to_backlog(skb, get_cpu(), &qtail); -- put_cpu(); -+ ret = enqueue_to_backlog(skb, get_cpu_light(), &qtail); -+ put_cpu_light(); - } - return ret; - } -@@ -3798,16 +3846,44 @@ int netif_rx_ni(struct sk_buff *skb) - - trace_netif_rx_ni_entry(skb); - -- preempt_disable(); -+ local_bh_disable(); - err = netif_rx_internal(skb); -- if (local_softirq_pending()) -- do_softirq(); -- preempt_enable(); -+ local_bh_enable(); - - return err; - } - EXPORT_SYMBOL(netif_rx_ni); - -+#ifdef CONFIG_PREEMPT_RT_FULL -+/* -+ * RT runs ksoftirqd as a real time thread and the root_lock is a -+ * "sleeping spinlock". If the trylock fails then we can go into an -+ * infinite loop when ksoftirqd preempted the task which actually -+ * holds the lock, because we requeue q and raise NET_TX softirq -+ * causing ksoftirqd to loop forever. -+ * -+ * It's safe to use spin_lock on RT here as softirqs run in thread -+ * context and cannot deadlock against the thread which is holding -+ * root_lock. -+ * -+ * On !RT the trylock might fail, but there we bail out from the -+ * softirq loop after 10 attempts which we can't do on RT. And the -+ * task holding root_lock cannot be preempted, so the only downside of -+ * that trylock is that we need 10 loops to decide that we should have -+ * given up in the first one :) -+ */ -+static inline int take_root_lock(spinlock_t *lock) -+{ -+ spin_lock(lock); -+ return 1; -+} -+#else -+static inline int take_root_lock(spinlock_t *lock) -+{ -+ return spin_trylock(lock); -+} -+#endif -+ - static void net_tx_action(struct softirq_action *h) - { - struct softnet_data *sd = this_cpu_ptr(&softnet_data); -@@ -3855,7 +3931,7 @@ static void net_tx_action(struct softirq_action *h) - head = head->next_sched; - - root_lock = qdisc_lock(q); -- if (spin_trylock(root_lock)) { -+ if (take_root_lock(root_lock)) { - smp_mb__before_atomic(); - clear_bit(__QDISC_STATE_SCHED, - &q->state); -@@ -4264,7 +4340,7 @@ static void flush_backlog(void *arg) - skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { - if (skb->dev == dev) { - __skb_unlink(skb, &sd->input_pkt_queue); -- kfree_skb(skb); -+ __skb_queue_tail(&sd->tofree_queue, skb); - input_queue_head_incr(sd); - } - } -@@ -4273,10 +4349,13 @@ static void flush_backlog(void *arg) - skb_queue_walk_safe(&sd->process_queue, skb, tmp) { - if (skb->dev == dev) { - __skb_unlink(skb, &sd->process_queue); -- kfree_skb(skb); -+ __skb_queue_tail(&sd->tofree_queue, skb); - input_queue_head_incr(sd); - } - } -+ -+ if (!skb_queue_empty(&sd->tofree_queue)) -+ raise_softirq_irqoff(NET_RX_SOFTIRQ); - } - - static int napi_gro_complete(struct sk_buff *skb) -@@ -4735,6 +4814,7 @@ static void net_rps_action_and_irq_enable(struct softnet_data *sd) - sd->rps_ipi_list = NULL; - - local_irq_enable(); -+ preempt_check_resched_rt(); - - /* Send pending IPI's to kick RPS processing on remote cpus. */ - while (remsd) { -@@ -4748,6 +4828,7 @@ static void net_rps_action_and_irq_enable(struct softnet_data *sd) - } else - #endif - local_irq_enable(); -+ preempt_check_resched_rt(); - } - - static bool sd_has_rps_ipi_waiting(struct softnet_data *sd) -@@ -4829,6 +4910,7 @@ void __napi_schedule(struct napi_struct *n) - local_irq_save(flags); - ____napi_schedule(this_cpu_ptr(&softnet_data), n); - local_irq_restore(flags); -+ preempt_check_resched_rt(); - } - EXPORT_SYMBOL(__napi_schedule); - -@@ -5169,7 +5251,7 @@ static void net_rx_action(struct softirq_action *h) - list_splice_tail(&repoll, &list); - list_splice(&list, &sd->poll_list); - if (!list_empty(&sd->poll_list)) -- __raise_softirq_irqoff(NET_RX_SOFTIRQ); -+ __raise_softirq_irqoff_ksoft(NET_RX_SOFTIRQ); - - net_rps_action_and_irq_enable(sd); - } -@@ -7534,7 +7616,7 @@ EXPORT_SYMBOL(free_netdev); - void synchronize_net(void) - { - might_sleep(); -- if (rtnl_is_locked()) -+ if (rtnl_is_locked() && !IS_ENABLED(CONFIG_PREEMPT_RT_FULL)) - synchronize_rcu_expedited(); - else - synchronize_rcu(); -@@ -7775,16 +7857,20 @@ static int dev_cpu_callback(struct notifier_block *nfb, - - raise_softirq_irqoff(NET_TX_SOFTIRQ); - local_irq_enable(); -+ preempt_check_resched_rt(); - - /* Process offline CPU's input_pkt_queue */ - while ((skb = __skb_dequeue(&oldsd->process_queue))) { - netif_rx_ni(skb); - input_queue_head_incr(oldsd); - } -- while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) { -+ while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) { - netif_rx_ni(skb); - input_queue_head_incr(oldsd); - } -+ while ((skb = __skb_dequeue(&oldsd->tofree_queue))) { -+ kfree_skb(skb); -+ } - - return NOTIFY_OK; - } -@@ -8086,8 +8172,9 @@ static int __init net_dev_init(void) - for_each_possible_cpu(i) { - struct softnet_data *sd = &per_cpu(softnet_data, i); - -- skb_queue_head_init(&sd->input_pkt_queue); -- skb_queue_head_init(&sd->process_queue); -+ skb_queue_head_init_raw(&sd->input_pkt_queue); -+ skb_queue_head_init_raw(&sd->process_queue); -+ skb_queue_head_init_raw(&sd->tofree_queue); - INIT_LIST_HEAD(&sd->poll_list); - sd->output_queue_tailp = &sd->output_queue; - #ifdef CONFIG_RPS -diff --git a/net/core/skbuff.c b/net/core/skbuff.c -index 59bf4d77154f..0c1e29b0f8fb 100644 ---- a/net/core/skbuff.c -+++ b/net/core/skbuff.c -@@ -63,6 +63,7 @@ - #include <linux/errqueue.h> - #include <linux/prefetch.h> - #include <linux/if_vlan.h> -+#include <linux/locallock.h> - - #include <net/protocol.h> - #include <net/dst.h> -@@ -359,6 +360,8 @@ struct napi_alloc_cache { - - static DEFINE_PER_CPU(struct page_frag_cache, netdev_alloc_cache); - static DEFINE_PER_CPU(struct napi_alloc_cache, napi_alloc_cache); -+static DEFINE_LOCAL_IRQ_LOCK(netdev_alloc_lock); -+static DEFINE_LOCAL_IRQ_LOCK(napi_alloc_cache_lock); - - static void *__netdev_alloc_frag(unsigned int fragsz, gfp_t gfp_mask) - { -@@ -366,10 +369,10 @@ static void *__netdev_alloc_frag(unsigned int fragsz, gfp_t gfp_mask) - unsigned long flags; - void *data; - -- local_irq_save(flags); -+ local_lock_irqsave(netdev_alloc_lock, flags); - nc = this_cpu_ptr(&netdev_alloc_cache); - data = __alloc_page_frag(nc, fragsz, gfp_mask); -- local_irq_restore(flags); -+ local_unlock_irqrestore(netdev_alloc_lock, flags); - return data; - } - -@@ -388,9 +391,13 @@ EXPORT_SYMBOL(netdev_alloc_frag); - - static void *__napi_alloc_frag(unsigned int fragsz, gfp_t gfp_mask) - { -- struct napi_alloc_cache *nc = this_cpu_ptr(&napi_alloc_cache); -+ struct napi_alloc_cache *nc; -+ void *data; - -- return __alloc_page_frag(&nc->page, fragsz, gfp_mask); -+ nc = &get_locked_var(napi_alloc_cache_lock, napi_alloc_cache); -+ data = __alloc_page_frag(&nc->page, fragsz, gfp_mask); -+ put_locked_var(napi_alloc_cache_lock, napi_alloc_cache); -+ return data; - } - - void *napi_alloc_frag(unsigned int fragsz) -@@ -437,13 +444,13 @@ struct sk_buff *__netdev_alloc_skb(struct net_device *dev, unsigned int len, - if (sk_memalloc_socks()) - gfp_mask |= __GFP_MEMALLOC; - -- local_irq_save(flags); -+ local_lock_irqsave(netdev_alloc_lock, flags); - - nc = this_cpu_ptr(&netdev_alloc_cache); - data = __alloc_page_frag(nc, len, gfp_mask); - pfmemalloc = nc->pfmemalloc; - -- local_irq_restore(flags); -+ local_unlock_irqrestore(netdev_alloc_lock, flags); - - if (unlikely(!data)) - return NULL; -@@ -484,9 +491,10 @@ EXPORT_SYMBOL(__netdev_alloc_skb); - struct sk_buff *__napi_alloc_skb(struct napi_struct *napi, unsigned int len, - gfp_t gfp_mask) - { -- struct napi_alloc_cache *nc = this_cpu_ptr(&napi_alloc_cache); -+ struct napi_alloc_cache *nc; - struct sk_buff *skb; - void *data; -+ bool pfmemalloc; - - len += NET_SKB_PAD + NET_IP_ALIGN; - -@@ -504,7 +512,10 @@ struct sk_buff *__napi_alloc_skb(struct napi_struct *napi, unsigned int len, - if (sk_memalloc_socks()) - gfp_mask |= __GFP_MEMALLOC; - -+ nc = &get_locked_var(napi_alloc_cache_lock, napi_alloc_cache); - data = __alloc_page_frag(&nc->page, len, gfp_mask); -+ pfmemalloc = nc->page.pfmemalloc; -+ put_locked_var(napi_alloc_cache_lock, napi_alloc_cache); - if (unlikely(!data)) - return NULL; - -@@ -515,7 +526,7 @@ struct sk_buff *__napi_alloc_skb(struct napi_struct *napi, unsigned int len, - } - - /* use OR instead of assignment to avoid clearing of bits in mask */ -- if (nc->page.pfmemalloc) -+ if (pfmemalloc) - skb->pfmemalloc = 1; - skb->head_frag = 1; - -@@ -759,23 +770,26 @@ EXPORT_SYMBOL(consume_skb); - - void __kfree_skb_flush(void) - { -- struct napi_alloc_cache *nc = this_cpu_ptr(&napi_alloc_cache); -+ struct napi_alloc_cache *nc; - -+ nc = &get_locked_var(napi_alloc_cache_lock, napi_alloc_cache); - /* flush skb_cache if containing objects */ - if (nc->skb_count) { - kmem_cache_free_bulk(skbuff_head_cache, nc->skb_count, - nc->skb_cache); - nc->skb_count = 0; - } -+ put_locked_var(napi_alloc_cache_lock, napi_alloc_cache); - } - - static inline void _kfree_skb_defer(struct sk_buff *skb) - { -- struct napi_alloc_cache *nc = this_cpu_ptr(&napi_alloc_cache); -+ struct napi_alloc_cache *nc; - - /* drop skb->head and call any destructors for packet */ - skb_release_all(skb); - -+ nc = &get_locked_var(napi_alloc_cache_lock, napi_alloc_cache); - /* record skb to CPU local list */ - nc->skb_cache[nc->skb_count++] = skb; - -@@ -790,6 +804,7 @@ static inline void _kfree_skb_defer(struct sk_buff *skb) - nc->skb_cache); - nc->skb_count = 0; - } -+ put_locked_var(napi_alloc_cache_lock, napi_alloc_cache); - } - void __kfree_skb_defer(struct sk_buff *skb) - { -diff --git a/net/core/sock.c b/net/core/sock.c -index 7e73c26b6bb4..885fe2ec43fb 100644 ---- a/net/core/sock.c -+++ b/net/core/sock.c -@@ -2421,12 +2421,11 @@ void lock_sock_nested(struct sock *sk, int subclass) - if (sk->sk_lock.owned) - __lock_sock(sk); - sk->sk_lock.owned = 1; -- spin_unlock(&sk->sk_lock.slock); -+ spin_unlock_bh(&sk->sk_lock.slock); - /* - * The sk_lock has mutex_lock() semantics here: - */ - mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); -- local_bh_enable(); - } - EXPORT_SYMBOL(lock_sock_nested); - -diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c -index 6333489771ed..c1f1d5030d37 100644 ---- a/net/ipv4/icmp.c -+++ b/net/ipv4/icmp.c -@@ -69,6 +69,7 @@ - #include <linux/jiffies.h> - #include <linux/kernel.h> - #include <linux/fcntl.h> -+#include <linux/sysrq.h> - #include <linux/socket.h> - #include <linux/in.h> - #include <linux/inet.h> -@@ -891,6 +892,30 @@ static bool icmp_redirect(struct sk_buff *skb) - } - - /* -+ * 32bit and 64bit have different timestamp length, so we check for -+ * the cookie at offset 20 and verify it is repeated at offset 50 -+ */ -+#define CO_POS0 20 -+#define CO_POS1 50 -+#define CO_SIZE sizeof(int) -+#define ICMP_SYSRQ_SIZE 57 -+ -+/* -+ * We got a ICMP_SYSRQ_SIZE sized ping request. Check for the cookie -+ * pattern and if it matches send the next byte as a trigger to sysrq. -+ */ -+static void icmp_check_sysrq(struct net *net, struct sk_buff *skb) -+{ -+ int cookie = htonl(net->ipv4.sysctl_icmp_echo_sysrq); -+ char *p = skb->data; -+ -+ if (!memcmp(&cookie, p + CO_POS0, CO_SIZE) && -+ !memcmp(&cookie, p + CO_POS1, CO_SIZE) && -+ p[CO_POS0 + CO_SIZE] == p[CO_POS1 + CO_SIZE]) -+ handle_sysrq(p[CO_POS0 + CO_SIZE]); -+} -+ -+/* - * Handle ICMP_ECHO ("ping") requests. - * - * RFC 1122: 3.2.2.6 MUST have an echo server that answers ICMP echo -@@ -917,6 +942,11 @@ static bool icmp_echo(struct sk_buff *skb) - icmp_param.data_len = skb->len; - icmp_param.head_len = sizeof(struct icmphdr); - icmp_reply(&icmp_param, skb); -+ -+ if (skb->len == ICMP_SYSRQ_SIZE && -+ net->ipv4.sysctl_icmp_echo_sysrq) { -+ icmp_check_sysrq(net, skb); -+ } - } - /* should there be an ICMP stat for ignored echos? */ - return true; -diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c -index bc5196ea1bdf..fc646aa7fad7 100644 ---- a/net/ipv4/inet_connection_sock.c -+++ b/net/ipv4/inet_connection_sock.c -@@ -603,7 +603,7 @@ static void reqsk_timer_handler(unsigned long data) - if (req->num_timeout++ == 0) - atomic_dec(&queue->young); - timeo = min(TCP_TIMEOUT_INIT << req->num_timeout, TCP_RTO_MAX); -- mod_timer_pinned(&req->rsk_timer, jiffies + timeo); -+ mod_timer(&req->rsk_timer, jiffies + timeo); - return; - } - drop: -@@ -617,8 +617,9 @@ static void reqsk_queue_hash_req(struct request_sock *req, - req->num_timeout = 0; - req->sk = NULL; - -- setup_timer(&req->rsk_timer, reqsk_timer_handler, (unsigned long)req); -- mod_timer_pinned(&req->rsk_timer, jiffies + timeout); -+ setup_pinned_timer(&req->rsk_timer, reqsk_timer_handler, -+ (unsigned long)req); -+ mod_timer(&req->rsk_timer, jiffies + timeout); - - inet_ehash_insert(req_to_sk(req), NULL); - /* before letting lookups find us, make sure all req fields -diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c -index c67f9bd7699c..dfb6286f2e49 100644 ---- a/net/ipv4/inet_timewait_sock.c -+++ b/net/ipv4/inet_timewait_sock.c -@@ -188,7 +188,8 @@ struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, - tw->tw_prot = sk->sk_prot_creator; - atomic64_set(&tw->tw_cookie, atomic64_read(&sk->sk_cookie)); - twsk_net_set(tw, sock_net(sk)); -- setup_timer(&tw->tw_timer, tw_timer_handler, (unsigned long)tw); -+ setup_pinned_timer(&tw->tw_timer, tw_timer_handler, -+ (unsigned long)tw); - /* - * Because we use RCU lookups, we should not set tw_refcnt - * to a non null value before everything is setup for this -@@ -248,7 +249,7 @@ void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo, bool rearm) - - tw->tw_kill = timeo <= 4*HZ; - if (!rearm) { -- BUG_ON(mod_timer_pinned(&tw->tw_timer, jiffies + timeo)); -+ BUG_ON(mod_timer(&tw->tw_timer, jiffies + timeo)); - atomic_inc(&tw->tw_dr->tw_count); - } else { - mod_timer_pending(&tw->tw_timer, jiffies + timeo); -diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c -index 03112a3106ab..daa6c5184977 100644 ---- a/net/ipv4/sysctl_net_ipv4.c -+++ b/net/ipv4/sysctl_net_ipv4.c -@@ -681,6 +681,13 @@ static struct ctl_table ipv4_net_table[] = { - .proc_handler = proc_dointvec - }, - { -+ .procname = "icmp_echo_sysrq", -+ .data = &init_net.ipv4.sysctl_icmp_echo_sysrq, -+ .maxlen = sizeof(int), -+ .mode = 0644, -+ .proc_handler = proc_dointvec -+ }, -+ { - .procname = "icmp_ignore_bogus_error_responses", - .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses, - .maxlen = sizeof(int), -diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c -index dc27becb9b71..7815f28bc30b 100644 ---- a/net/mac80211/rx.c -+++ b/net/mac80211/rx.c -@@ -3679,7 +3679,7 @@ void ieee80211_rx_napi(struct ieee80211_hw *hw, struct sk_buff *skb, - struct ieee80211_supported_band *sband; - struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); - -- WARN_ON_ONCE(softirq_count() == 0); -+ WARN_ON_ONCE_NONRT(softirq_count() == 0); - - if (WARN_ON(status->band >= IEEE80211_NUM_BANDS)) - goto drop; -diff --git a/net/netfilter/core.c b/net/netfilter/core.c -index f39276d1c2d7..10880c89d62f 100644 ---- a/net/netfilter/core.c -+++ b/net/netfilter/core.c -@@ -22,11 +22,17 @@ - #include <linux/proc_fs.h> - #include <linux/mutex.h> - #include <linux/slab.h> -+#include <linux/locallock.h> - #include <net/net_namespace.h> - #include <net/sock.h> - - #include "nf_internals.h" - -+#ifdef CONFIG_PREEMPT_RT_BASE -+DEFINE_LOCAL_IRQ_LOCK(xt_write_lock); -+EXPORT_PER_CPU_SYMBOL(xt_write_lock); -+#endif -+ - static DEFINE_MUTEX(afinfo_mutex); - - const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO] __read_mostly; -diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c -index 8012f67ca5ae..dbfd52456676 100644 ---- a/net/packet/af_packet.c -+++ b/net/packet/af_packet.c -@@ -63,6 +63,7 @@ - #include <linux/if_packet.h> - #include <linux/wireless.h> - #include <linux/kernel.h> -+#include <linux/delay.h> - #include <linux/kmod.h> - #include <linux/slab.h> - #include <linux/vmalloc.h> -@@ -694,7 +695,7 @@ static void prb_retire_rx_blk_timer_expired(unsigned long data) - if (BLOCK_NUM_PKTS(pbd)) { - while (atomic_read(&pkc->blk_fill_in_prog)) { - /* Waiting for skb_copy_bits to finish... */ -- cpu_relax(); -+ cpu_chill(); - } - } - -@@ -956,7 +957,7 @@ static void prb_retire_current_block(struct tpacket_kbdq_core *pkc, - if (!(status & TP_STATUS_BLK_TMO)) { - while (atomic_read(&pkc->blk_fill_in_prog)) { - /* Waiting for skb_copy_bits to finish... */ -- cpu_relax(); -+ cpu_chill(); - } - } - prb_close_block(pkc, pbd, po, status); -diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c -index f7164ac1ffc1..6f37dd5fc717 100644 ---- a/net/rds/ib_rdma.c -+++ b/net/rds/ib_rdma.c -@@ -34,6 +34,7 @@ - #include <linux/slab.h> - #include <linux/rculist.h> - #include <linux/llist.h> -+#include <linux/delay.h> - - #include "ib_mr.h" - -@@ -209,7 +210,7 @@ static inline void wait_clean_list_grace(void) - for_each_online_cpu(cpu) { - flag = &per_cpu(clean_list_grace, cpu); - while (test_bit(CLEAN_LIST_BUSY_BIT, flag)) -- cpu_relax(); -+ cpu_chill(); - } - } - -diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c -index 80742edea96f..31f70ee7e609 100644 ---- a/net/sched/sch_generic.c -+++ b/net/sched/sch_generic.c -@@ -894,7 +894,7 @@ void dev_deactivate_many(struct list_head *head) - /* Wait for outstanding qdisc_run calls. */ - list_for_each_entry(dev, head, close_list) - while (some_qdisc_is_busy(dev)) -- yield(); -+ msleep(1); - } - - void dev_deactivate(struct net_device *dev) -diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c -index 7231cb413a2c..e9c57cd2cb7c 100644 ---- a/net/sunrpc/svc_xprt.c -+++ b/net/sunrpc/svc_xprt.c -@@ -344,7 +344,7 @@ void svc_xprt_do_enqueue(struct svc_xprt *xprt) - goto out; - } - -- cpu = get_cpu(); -+ cpu = get_cpu_light(); - pool = svc_pool_for_cpu(xprt->xpt_server, cpu); - - atomic_long_inc(&pool->sp_stats.packets); -@@ -380,7 +380,7 @@ void svc_xprt_do_enqueue(struct svc_xprt *xprt) - - atomic_long_inc(&pool->sp_stats.threads_woken); - wake_up_process(rqstp->rq_task); -- put_cpu(); -+ put_cpu_light(); - goto out; - } - rcu_read_unlock(); -@@ -401,7 +401,7 @@ void svc_xprt_do_enqueue(struct svc_xprt *xprt) - goto redo_search; - } - rqstp = NULL; -- put_cpu(); -+ put_cpu_light(); - out: - trace_svc_xprt_do_enqueue(xprt, rqstp); - } -diff --git a/scripts/mkcompile_h b/scripts/mkcompile_h -index 6fdc97ef6023..523e0420d7f0 100755 ---- a/scripts/mkcompile_h -+++ b/scripts/mkcompile_h -@@ -4,7 +4,8 @@ TARGET=$1 - ARCH=$2 - SMP=$3 - PREEMPT=$4 --CC=$5 -+RT=$5 -+CC=$6 - - vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; } - -@@ -57,6 +58,7 @@ UTS_VERSION="#$VERSION" - CONFIG_FLAGS="" - if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi - if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi -+if [ -n "$RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS RT"; fi - UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP" - - # Truncate to maximum length -diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c -index 9106d8e2300e..6c55707fdc30 100644 ---- a/sound/core/pcm_native.c -+++ b/sound/core/pcm_native.c -@@ -135,7 +135,7 @@ EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); - void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) - { - if (!substream->pcm->nonatomic) -- local_irq_disable(); -+ local_irq_disable_nort(); - snd_pcm_stream_lock(substream); - } - EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); -@@ -150,7 +150,7 @@ void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) - { - snd_pcm_stream_unlock(substream); - if (!substream->pcm->nonatomic) -- local_irq_enable(); -+ local_irq_enable_nort(); - } - EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); - -@@ -158,7 +158,7 @@ unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) - { - unsigned long flags = 0; - if (!substream->pcm->nonatomic) -- local_irq_save(flags); -+ local_irq_save_nort(flags); - snd_pcm_stream_lock(substream); - return flags; - } -@@ -176,7 +176,7 @@ void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, - { - snd_pcm_stream_unlock(substream); - if (!substream->pcm->nonatomic) -- local_irq_restore(flags); -+ local_irq_restore_nort(flags); - } - EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); - |