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authorWaldemar Brodkorb <wbx@uclibc-ng.org>2016-09-10 16:25:13 +0200
committerWaldemar Brodkorb <wbx@uclibc-ng.org>2016-09-10 16:25:13 +0200
commit4b52a472673bea601d130d3f9770cc2764b8bdc7 (patch)
treec5f42a8f4bfdedd48d415311621d70f1be8a9f64 /target/linux
parent8f33484dd53d4271b16173df31b2804e122d9b8b (diff)
linux: remove deprecated 4.6 support
Diffstat (limited to 'target/linux')
-rw-r--r--target/linux/config/Config.in.kernel6
-rw-r--r--target/linux/patches/4.6.6/crisv32.patch33
-rw-r--r--target/linux/patches/4.6.6/initramfs-nosizelimit.patch57
-rw-r--r--target/linux/patches/4.6.6/ld-or1k.patch12
-rw-r--r--target/linux/patches/4.6.6/macsonic.patch11
-rw-r--r--target/linux/patches/4.6.6/patch-realtime26232
-rw-r--r--target/linux/patches/4.6.6/revert-sparc.patch295
-rw-r--r--target/linux/patches/4.6.6/startup.patch34
8 files changed, 2 insertions, 26678 deletions
diff --git a/target/linux/config/Config.in.kernel b/target/linux/config/Config.in.kernel
index 843929376..5c8c84f30 100644
--- a/target/linux/config/Config.in.kernel
+++ b/target/linux/config/Config.in.kernel
@@ -142,8 +142,7 @@ config ADK_KERNEL_PREEMPT_RTB
select ADK_KERNEL_HIGH_RES_TIMERS
select ADK_KERNEL_PATCH_REALTIME
depends on ADK_TARGET_KERNEL_VERSION_4_1 \
- || ADK_TARGET_KERNEL_VERSION_4_4 \
- || ADK_TARGET_KERNEL_VERSION_4_6
+ || ADK_TARGET_KERNEL_VERSION_4_4
help
Preemptible Kernel (Basic RT)
@@ -152,8 +151,7 @@ config ADK_KERNEL_PREEMPT_RT_FULL
select ADK_KERNEL_HIGH_RES_TIMERS
select ADK_KERNEL_PATCH_REALTIME
depends on ADK_TARGET_KERNEL_VERSION_4_1 \
- || ADK_TARGET_KERNEL_VERSION_4_4 \
- || ADK_TARGET_KERNEL_VERSION_4_6
+ || ADK_TARGET_KERNEL_VERSION_4_4
help
Fully Preemptible Kernel (RealTime)
https://www.kernel.org/pub/linux/kernel/projects/rt/
diff --git a/target/linux/patches/4.6.6/crisv32.patch b/target/linux/patches/4.6.6/crisv32.patch
deleted file mode 100644
index cb9b0d028..000000000
--- a/target/linux/patches/4.6.6/crisv32.patch
+++ /dev/null
@@ -1,33 +0,0 @@
-diff -Nur linux-4.4.13.orig/arch/cris/arch-v32/mm/intmem.c linux-4.4.13/arch/cris/arch-v32/mm/intmem.c
---- linux-4.4.13.orig/arch/cris/arch-v32/mm/intmem.c 2016-06-08 03:14:51.000000000 +0200
-+++ linux-4.4.13/arch/cris/arch-v32/mm/intmem.c 2016-06-21 20:40:18.919361891 +0200
-@@ -113,14 +113,14 @@
-
- allocation->status = STATUS_FREE;
- /* Join with prev and/or next if also free */
-- if ((prev != &intmem_allocations) &&
-+ if ((&prev->entry != &intmem_allocations) &&
- (prev->status == STATUS_FREE)) {
- prev->size += allocation->size;
- list_del(&allocation->entry);
- kfree(allocation);
- allocation = prev;
- }
-- if ((next != &intmem_allocations) &&
-+ if ((&next->entry != &intmem_allocations) &&
- (next->status == STATUS_FREE)) {
- allocation->size += next->size;
- list_del(&next->entry);
-@@ -145,5 +145,11 @@
- (unsigned long)intmem_virtual + MEM_INTMEM_START +
- RESERVED_SIZE);
- }
--device_initcall(crisv32_intmem_init);
-
-+static int __init crisv32_intmem_setup(void)
-+{
-+ crisv32_intmem_init();
-+
-+ return 0;
-+}
-+device_initcall(crisv32_intmem_setup);
diff --git a/target/linux/patches/4.6.6/initramfs-nosizelimit.patch b/target/linux/patches/4.6.6/initramfs-nosizelimit.patch
deleted file mode 100644
index 40d2f6bd8..000000000
--- a/target/linux/patches/4.6.6/initramfs-nosizelimit.patch
+++ /dev/null
@@ -1,57 +0,0 @@
-From 9a18df7a71bfa620b1278777d64783a359d7eb4e Mon Sep 17 00:00:00 2001
-From: Thorsten Glaser <tg@mirbsd.org>
-Date: Sun, 4 May 2014 01:37:54 +0200
-Subject: [PATCH] mount tmpfs-as-rootfs (initramfs) with -o
- nr_blocks=0,nr_inodes=0
-
-I would have preferred to write this patch to be able to pass
-rootflags=nr_blocks=0,nr_inodes=0 on the kernel command line,
-and then hand these rootflags over to the initramfs (tmpfs)
-mount in the same way the kernel hands them over to the block
-device rootfs mount. But at least the Debian/m68k initrd also
-parses $rootflags from the environment and adds it to the call
-to the user-space mount for the eventual root device, which
-would make the kernel command line rootflags option be used in
-both places (tmpfs and e.g. ext4) which is guaranteed to error
-out in at least one of them.
-
-This change is intended to aid people in a setup where the
-initrd is the final root filesystem, i.e. not mounted over.
-This is especially useful in automated tests running on qemu
-for boards with constrained memory (e.g. 64 MiB on sh4).
-
-Considering that the initramfs is normally emptied out then
-overmounted, this change is probably safe for setups where
-initramfs just hosts early userspace, too, since the tmpfs
-backing it is not accessible any more later on, AFAICT.
-
-Signed-off-by: Thorsten Glaser <tg@mirbsd.org>
----
- init/do_mounts.c | 4 ++++
- 1 file changed, 4 insertions(+)
-
-diff --git a/init/do_mounts.c b/init/do_mounts.c
-index 82f2288..55a4cfe 100644
---- a/init/do_mounts.c
-+++ b/init/do_mounts.c
-@@ -594,6 +594,7 @@ out:
- }
-
- static bool is_tmpfs;
-+static char tmpfs_rootflags[] = "nr_blocks=0,nr_inodes=0";
- static struct dentry *rootfs_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
- {
-@@ -606,6 +607,9 @@ static struct dentry *rootfs_mount(struct file_system_type *fs_type,
- if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs)
- fill = shmem_fill_super;
-
-+ if (is_tmpfs)
-+ data = tmpfs_rootflags;
-+
- return mount_nodev(fs_type, flags, data, fill);
- }
-
---
-2.0.0.rc0
-
diff --git a/target/linux/patches/4.6.6/ld-or1k.patch b/target/linux/patches/4.6.6/ld-or1k.patch
deleted file mode 100644
index 264f9166f..000000000
--- a/target/linux/patches/4.6.6/ld-or1k.patch
+++ /dev/null
@@ -1,12 +0,0 @@
-diff -Nur linux-4.4.5.orig/arch/openrisc/kernel/vmlinux.lds.S linux-4.4.5/arch/openrisc/kernel/vmlinux.lds.S
---- linux-4.4.5.orig/arch/openrisc/kernel/vmlinux.lds.S 2016-03-10 00:35:58.000000000 +0100
-+++ linux-4.4.5/arch/openrisc/kernel/vmlinux.lds.S 2016-03-16 09:21:07.933535532 +0100
-@@ -30,7 +30,7 @@
- #include <asm/cache.h>
- #include <asm-generic/vmlinux.lds.h>
-
--OUTPUT_FORMAT("elf32-or32", "elf32-or32", "elf32-or32")
-+OUTPUT_FORMAT("elf32-or1k", "elf32-or1k", "elf32-or1k")
- jiffies = jiffies_64 + 4;
-
- SECTIONS
diff --git a/target/linux/patches/4.6.6/macsonic.patch b/target/linux/patches/4.6.6/macsonic.patch
deleted file mode 100644
index 75a6fcad2..000000000
--- a/target/linux/patches/4.6.6/macsonic.patch
+++ /dev/null
@@ -1,11 +0,0 @@
-diff -Nur linux-4.4.6.orig/drivers/net/ethernet/natsemi/Kconfig linux-4.4.6/drivers/net/ethernet/natsemi/Kconfig
---- linux-4.4.6.orig/drivers/net/ethernet/natsemi/Kconfig 2016-03-16 16:43:17.000000000 +0100
-+++ linux-4.4.6/drivers/net/ethernet/natsemi/Kconfig 2016-03-18 10:43:34.000000000 +0100
-@@ -18,6 +18,7 @@
- config MACSONIC
- tristate "Macintosh SONIC based ethernet (onboard, NuBus, LC, CS)"
- depends on MAC
-+ select BITREVERSE
- ---help---
- Support for NatSemi SONIC based Ethernet devices. This includes
- the onboard Ethernet in many Quadras as well as some LC-PDS,
diff --git a/target/linux/patches/4.6.6/patch-realtime b/target/linux/patches/4.6.6/patch-realtime
deleted file mode 100644
index dbaa94b0a..000000000
--- a/target/linux/patches/4.6.6/patch-realtime
+++ /dev/null
@@ -1,26232 +0,0 @@
-diff -Nur linux-4.6.6.orig/arch/arm/include/asm/switch_to.h linux-4.6.6/arch/arm/include/asm/switch_to.h
---- linux-4.6.6.orig/arch/arm/include/asm/switch_to.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/include/asm/switch_to.h 2016-08-22 21:27:46.269819745 +0200
-@@ -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 @@
- #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 -Nur linux-4.6.6.orig/arch/arm/include/asm/thread_info.h linux-4.6.6/arch/arm/include/asm/thread_info.h
---- linux-4.6.6.orig/arch/arm/include/asm/thread_info.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/include/asm/thread_info.h 2016-08-22 21:27:46.269819745 +0200
-@@ -49,6 +49,7 @@
- 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 @@
- #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 @@
- #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 @@
- * 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 -Nur linux-4.6.6.orig/arch/arm/Kconfig linux-4.6.6/arch/arm/Kconfig
---- linux-4.6.6.orig/arch/arm/Kconfig 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/Kconfig 2016-08-22 21:27:46.261819236 +0200
-@@ -35,7 +35,7 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/arch/arm/kernel/asm-offsets.c linux-4.6.6/arch/arm/kernel/asm-offsets.c
---- linux-4.6.6.orig/arch/arm/kernel/asm-offsets.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/kernel/asm-offsets.c 2016-08-22 21:27:46.293821284 +0200
-@@ -65,6 +65,7 @@
- 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 -Nur linux-4.6.6.orig/arch/arm/kernel/entry-armv.S linux-4.6.6/arch/arm/kernel/entry-armv.S
---- linux-4.6.6.orig/arch/arm/kernel/entry-armv.S 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/kernel/entry-armv.S 2016-08-22 21:27:46.305822058 +0200
-@@ -215,11 +215,18 @@
- #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 @@
- 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 -Nur linux-4.6.6.orig/arch/arm/kernel/entry-common.S linux-4.6.6/arch/arm/kernel/entry-common.S
---- linux-4.6.6.orig/arch/arm/kernel/entry-common.S 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/kernel/entry-common.S 2016-08-22 21:27:46.305822058 +0200
-@@ -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 @@
- 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 -Nur linux-4.6.6.orig/arch/arm/kernel/process.c linux-4.6.6/arch/arm/kernel/process.c
---- linux-4.6.6.orig/arch/arm/kernel/process.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/kernel/process.c 2016-08-22 21:27:46.313822571 +0200
-@@ -319,6 +319,30 @@
- }
-
- #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 -Nur linux-4.6.6.orig/arch/arm/kernel/signal.c linux-4.6.6/arch/arm/kernel/signal.c
---- linux-4.6.6.orig/arch/arm/kernel/signal.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/kernel/signal.c 2016-08-22 21:27:46.313822571 +0200
-@@ -572,7 +572,8 @@
- */
- 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 -Nur linux-4.6.6.orig/arch/arm/kernel/smp.c linux-4.6.6/arch/arm/kernel/smp.c
---- linux-4.6.6.orig/arch/arm/kernel/smp.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/kernel/smp.c 2016-08-22 21:27:46.313822571 +0200
-@@ -234,8 +234,6 @@
- flush_cache_louis();
- local_flush_tlb_all();
-
-- clear_tasks_mm_cpumask(cpu);
--
- return 0;
- }
-
-@@ -251,6 +249,9 @@
- pr_err("CPU%u: cpu didn't die\n", cpu);
- return;
- }
-+
-+ clear_tasks_mm_cpumask(cpu);
-+
- pr_notice("CPU%u: shutdown\n", cpu);
-
- /*
-diff -Nur linux-4.6.6.orig/arch/arm/kernel/unwind.c linux-4.6.6/arch/arm/kernel/unwind.c
---- linux-4.6.6.orig/arch/arm/kernel/unwind.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/kernel/unwind.c 2016-08-22 21:27:46.317822824 +0200
-@@ -93,7 +93,7 @@
- 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 @@
- /* 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 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/arch/arm/kvm/arm.c linux-4.6.6/arch/arm/kvm/arm.c
---- linux-4.6.6.orig/arch/arm/kvm/arm.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/kvm/arm.c 2016-08-22 21:27:46.321823084 +0200
-@@ -582,7 +582,7 @@
- * 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 @@
- kvm_pmu_sync_hwstate(vcpu);
- kvm_timer_sync_hwstate(vcpu);
- kvm_vgic_sync_hwstate(vcpu);
-- preempt_enable();
-+ migrate_enable();
- continue;
- }
-
-@@ -659,7 +659,7 @@
-
- kvm_vgic_sync_hwstate(vcpu);
-
-- preempt_enable();
-+ migrate_enable();
-
- ret = handle_exit(vcpu, run, ret);
- }
-diff -Nur linux-4.6.6.orig/arch/arm/mach-exynos/platsmp.c linux-4.6.6/arch/arm/mach-exynos/platsmp.c
---- linux-4.6.6.orig/arch/arm/mach-exynos/platsmp.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/mach-exynos/platsmp.c 2016-08-22 21:27:46.329823597 +0200
-@@ -229,7 +229,7 @@
- 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 @@
- /*
- * 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 @@
- * 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 @@
-
- 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 @@
- * calibrations, then wait for it to finish
- */
- fail:
-- spin_unlock(&boot_lock);
-+ raw_spin_unlock(&boot_lock);
-
- return pen_release != -1 ? ret : 0;
- }
-diff -Nur linux-4.6.6.orig/arch/arm/mach-hisi/platmcpm.c linux-4.6.6/arch/arm/mach-hisi/platmcpm.c
---- linux-4.6.6.orig/arch/arm/mach-hisi/platmcpm.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/mach-hisi/platmcpm.c 2016-08-22 21:27:46.337824110 +0200
-@@ -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 @@
- 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 @@
-
- out:
- hip04_cpu_table[cluster][cpu]++;
-- spin_unlock_irq(&boot_lock);
-+ raw_spin_unlock_irq(&boot_lock);
-
- return 0;
- }
-@@ -162,11 +162,11 @@
- 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 @@
- }
-
- 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 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/arch/arm/mach-imx/Kconfig linux-4.6.6/arch/arm/mach-imx/Kconfig
---- linux-4.6.6.orig/arch/arm/mach-imx/Kconfig 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/mach-imx/Kconfig 2016-08-22 21:27:46.337824110 +0200
-@@ -526,7 +526,7 @@
- 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 -Nur linux-4.6.6.orig/arch/arm/mach-omap2/omap-smp.c linux-4.6.6/arch/arm/mach-omap2/omap-smp.c
---- linux-4.6.6.orig/arch/arm/mach-omap2/omap-smp.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/mach-omap2/omap-smp.c 2016-08-22 21:27:46.345824623 +0200
-@@ -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 @@
- /*
- * 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 @@
- * 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 @@
- * 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 -Nur linux-4.6.6.orig/arch/arm/mach-prima2/platsmp.c linux-4.6.6/arch/arm/mach-prima2/platsmp.c
---- linux-4.6.6.orig/arch/arm/mach-prima2/platsmp.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/mach-prima2/platsmp.c 2016-08-22 21:27:46.353825136 +0200
-@@ -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 @@
- /*
- * 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 @@
- /* 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 @@
- * 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 -Nur linux-4.6.6.orig/arch/arm/mach-qcom/platsmp.c linux-4.6.6/arch/arm/mach-qcom/platsmp.c
---- linux-4.6.6.orig/arch/arm/mach-qcom/platsmp.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/mach-qcom/platsmp.c 2016-08-22 21:27:46.361825650 +0200
-@@ -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 @@
- /*
- * 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 @@
- * 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 @@
- * 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 -Nur linux-4.6.6.orig/arch/arm/mach-spear/platsmp.c linux-4.6.6/arch/arm/mach-spear/platsmp.c
---- linux-4.6.6.orig/arch/arm/mach-spear/platsmp.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/mach-spear/platsmp.c 2016-08-22 21:27:46.365825902 +0200
-@@ -32,7 +32,7 @@
- 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 @@
- /*
- * 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 @@
- * 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 @@
- * 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 -Nur linux-4.6.6.orig/arch/arm/mach-sti/platsmp.c linux-4.6.6/arch/arm/mach-sti/platsmp.c
---- linux-4.6.6.orig/arch/arm/mach-sti/platsmp.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/mach-sti/platsmp.c 2016-08-22 21:27:46.369826163 +0200
-@@ -35,7 +35,7 @@
- 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 @@
- /*
- * 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 @@
- * 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 @@
- * 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 -Nur linux-4.6.6.orig/arch/arm/mm/fault.c linux-4.6.6/arch/arm/mm/fault.c
---- linux-4.6.6.orig/arch/arm/mm/fault.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/mm/fault.c 2016-08-22 21:27:46.369826163 +0200
-@@ -430,6 +430,9 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/arch/arm/mm/highmem.c linux-4.6.6/arch/arm/mm/highmem.c
---- linux-4.6.6.orig/arch/arm/mm/highmem.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/mm/highmem.c 2016-08-22 21:27:46.369826163 +0200
-@@ -34,6 +34,11 @@
- 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 @@
-
- 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 @@
-
- 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 @@
- * 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 @@
-
- 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 -Nur linux-4.6.6.orig/arch/arm/plat-versatile/platsmp.c linux-4.6.6/arch/arm/plat-versatile/platsmp.c
---- linux-4.6.6.orig/arch/arm/plat-versatile/platsmp.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm/plat-versatile/platsmp.c 2016-08-22 21:27:46.381826929 +0200
-@@ -30,7 +30,7 @@
- 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 @@
- /*
- * 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 @@
- * 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 @@
- * 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 -Nur linux-4.6.6.orig/arch/arm64/include/asm/thread_info.h linux-4.6.6/arch/arm64/include/asm/thread_info.h
---- linux-4.6.6.orig/arch/arm64/include/asm/thread_info.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm64/include/asm/thread_info.h 2016-08-22 21:27:46.393827702 +0200
-@@ -49,6 +49,7 @@
- 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 @@
- #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 @@
- #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 @@
- #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 -Nur linux-4.6.6.orig/arch/arm64/Kconfig linux-4.6.6/arch/arm64/Kconfig
---- linux-4.6.6.orig/arch/arm64/Kconfig 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm64/Kconfig 2016-08-22 21:27:46.389827442 +0200
-@@ -81,6 +81,7 @@
- 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
- bool "Xen guest support on ARM64"
-- depends on ARM64 && OF
-+ depends on ARM64 && OF && !PREEMPT_RT_FULL
- select SWIOTLB_XEN
- select PARAVIRT
- help
-diff -Nur linux-4.6.6.orig/arch/arm64/kernel/asm-offsets.c linux-4.6.6/arch/arm64/kernel/asm-offsets.c
---- linux-4.6.6.orig/arch/arm64/kernel/asm-offsets.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm64/kernel/asm-offsets.c 2016-08-22 21:27:46.401828215 +0200
-@@ -36,6 +36,7 @@
- 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 -Nur linux-4.6.6.orig/arch/arm64/kernel/entry.S linux-4.6.6/arch/arm64/kernel/entry.S
---- linux-4.6.6.orig/arch/arm64/kernel/entry.S 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/arm64/kernel/entry.S 2016-08-22 21:27:46.405828468 +0200
-@@ -426,11 +426,16 @@
-
- #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 @@
- 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 @@
- */
- 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 -Nur linux-4.6.6.orig/arch/Kconfig linux-4.6.6/arch/Kconfig
---- linux-4.6.6.orig/arch/Kconfig 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/Kconfig 2016-08-22 21:27:46.245818207 +0200
-@@ -9,6 +9,7 @@
- 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 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 -Nur linux-4.6.6.orig/arch/mips/Kconfig linux-4.6.6/arch/mips/Kconfig
---- linux-4.6.6.orig/arch/mips/Kconfig 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/mips/Kconfig 2016-08-22 21:27:46.417829241 +0200
-@@ -2416,7 +2416,7 @@
- #
- 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 -Nur linux-4.6.6.orig/arch/powerpc/include/asm/thread_info.h linux-4.6.6/arch/powerpc/include/asm/thread_info.h
---- linux-4.6.6.orig/arch/powerpc/include/asm/thread_info.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/powerpc/include/asm/thread_info.h 2016-08-22 21:27:46.433830268 +0200
-@@ -42,6 +42,8 @@
- 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 @@
- #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 @@
- #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 @@
- #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 -Nur linux-4.6.6.orig/arch/powerpc/Kconfig linux-4.6.6/arch/powerpc/Kconfig
---- linux-4.6.6.orig/arch/powerpc/Kconfig 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/powerpc/Kconfig 2016-08-22 21:27:46.425829754 +0200
-@@ -57,10 +57,11 @@
-
- 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 @@
- 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 @@
-
- config HIGHMEM
- bool "High memory support"
-- depends on PPC32
-+ depends on PPC32 && !PREEMPT_RT_FULL
-
- source kernel/Kconfig.hz
- source kernel/Kconfig.preempt
-diff -Nur linux-4.6.6.orig/arch/powerpc/kernel/asm-offsets.c linux-4.6.6/arch/powerpc/kernel/asm-offsets.c
---- linux-4.6.6.orig/arch/powerpc/kernel/asm-offsets.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/powerpc/kernel/asm-offsets.c 2016-08-22 21:27:46.441830777 +0200
-@@ -162,6 +162,7 @@
- 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 -Nur linux-4.6.6.orig/arch/powerpc/kernel/entry_32.S linux-4.6.6/arch/powerpc/kernel/entry_32.S
---- linux-4.6.6.orig/arch/powerpc/kernel/entry_32.S 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/powerpc/kernel/entry_32.S 2016-08-22 21:27:46.481833341 +0200
-@@ -818,7 +818,14 @@
- 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 @@
- */
- 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 @@
- #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 @@
- 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 -Nur linux-4.6.6.orig/arch/powerpc/kernel/entry_64.S linux-4.6.6/arch/powerpc/kernel/entry_64.S
---- linux-4.6.6.orig/arch/powerpc/kernel/entry_64.S 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/powerpc/kernel/entry_64.S 2016-08-22 21:27:46.485833601 +0200
-@@ -644,7 +644,7 @@
- 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 @@
-
- #ifdef CONFIG_PREEMPT
- /* Check if we need to preempt */
-+ 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 */
-- lwz r8,TI_PREEMPT(r9)
-+check_count:
- cmpwi cr1,r8,0
- ld r0,SOFTE(r1)
- cmpdi r0,0
-@@ -726,7 +734,7 @@
- /* 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 -Nur linux-4.6.6.orig/arch/powerpc/kernel/irq.c linux-4.6.6/arch/powerpc/kernel/irq.c
---- linux-4.6.6.orig/arch/powerpc/kernel/irq.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/powerpc/kernel/irq.c 2016-08-22 21:27:46.493834114 +0200
-@@ -614,6 +614,7 @@
- }
- }
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- void do_softirq_own_stack(void)
- {
- struct thread_info *curtp, *irqtp;
-@@ -631,6 +632,7 @@
- if (irqtp->flags)
- set_bits(irqtp->flags, &curtp->flags);
- }
-+#endif
-
- irq_hw_number_t virq_to_hw(unsigned int virq)
- {
-diff -Nur linux-4.6.6.orig/arch/powerpc/kernel/misc_32.S linux-4.6.6/arch/powerpc/kernel/misc_32.S
---- linux-4.6.6.orig/arch/powerpc/kernel/misc_32.S 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/powerpc/kernel/misc_32.S 2016-08-22 21:27:46.497834367 +0200
-@@ -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 @@
- stw r10,THREAD+KSP_LIMIT(r2)
- mtlr r0
- blr
-+#endif
-
- /*
- * void call_do_irq(struct pt_regs *regs, struct thread_info *irqtp);
-diff -Nur linux-4.6.6.orig/arch/powerpc/kernel/misc_64.S linux-4.6.6/arch/powerpc/kernel/misc_64.S
---- linux-4.6.6.orig/arch/powerpc/kernel/misc_64.S 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/powerpc/kernel/misc_64.S 2016-08-22 21:27:46.497834367 +0200
-@@ -30,6 +30,7 @@
-
- .text
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- _GLOBAL(call_do_softirq)
- mflr r0
- std r0,16(r1)
-@@ -40,6 +41,7 @@
- ld r0,16(r1)
- mtlr r0
- blr
-+#endif
-
- _GLOBAL(call_do_irq)
- mflr r0
-diff -Nur linux-4.6.6.orig/arch/powerpc/kvm/Kconfig linux-4.6.6/arch/powerpc/kvm/Kconfig
---- linux-4.6.6.orig/arch/powerpc/kvm/Kconfig 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/powerpc/kvm/Kconfig 2016-08-22 21:27:46.501834627 +0200
-@@ -172,6 +172,7 @@
- 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 -Nur linux-4.6.6.orig/arch/powerpc/platforms/ps3/device-init.c linux-4.6.6/arch/powerpc/platforms/ps3/device-init.c
---- linux-4.6.6.orig/arch/powerpc/platforms/ps3/device-init.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/powerpc/platforms/ps3/device-init.c 2016-08-22 21:27:46.509835141 +0200
-@@ -752,7 +752,7 @@
- }
- 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 -Nur linux-4.6.6.orig/arch/sh/kernel/irq.c linux-4.6.6/arch/sh/kernel/irq.c
---- linux-4.6.6.orig/arch/sh/kernel/irq.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/sh/kernel/irq.c 2016-08-22 21:27:46.517835654 +0200
-@@ -147,6 +147,7 @@
- hardirq_ctx[cpu] = NULL;
- }
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- void do_softirq_own_stack(void)
- {
- struct thread_info *curctx;
-@@ -174,6 +175,7 @@
- "r5", "r6", "r7", "r8", "r9", "r15", "t", "pr"
- );
- }
-+#endif
- #else
- static inline void handle_one_irq(unsigned int irq)
- {
-diff -Nur linux-4.6.6.orig/arch/sparc/Kconfig linux-4.6.6/arch/sparc/Kconfig
---- linux-4.6.6.orig/arch/sparc/Kconfig 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/sparc/Kconfig 2016-08-22 21:27:46.525836167 +0200
-@@ -184,12 +184,10 @@
- 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 -Nur linux-4.6.6.orig/arch/sparc/kernel/irq_64.c linux-4.6.6/arch/sparc/kernel/irq_64.c
---- linux-4.6.6.orig/arch/sparc/kernel/irq_64.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/sparc/kernel/irq_64.c 2016-08-22 21:27:46.533836680 +0200
-@@ -854,6 +854,7 @@
- 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 @@
- __asm__ __volatile__("mov %0, %%sp"
- : : "r" (orig_sp));
- }
-+#endif
-
- #ifdef CONFIG_HOTPLUG_CPU
- void fixup_irqs(void)
-diff -Nur linux-4.6.6.orig/arch/x86/crypto/aesni-intel_glue.c linux-4.6.6/arch/x86/crypto/aesni-intel_glue.c
---- linux-4.6.6.orig/arch/x86/crypto/aesni-intel_glue.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/crypto/aesni-intel_glue.c 2016-08-22 21:27:46.549837706 +0200
-@@ -383,14 +383,14 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/arch/x86/crypto/cast5_avx_glue.c linux-4.6.6/arch/x86/crypto/cast5_avx_glue.c
---- linux-4.6.6.orig/arch/x86/crypto/cast5_avx_glue.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/crypto/cast5_avx_glue.c 2016-08-22 21:27:46.561838472 +0200
-@@ -59,7 +59,7 @@
- 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 @@
- 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 @@
- } 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 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 @@
- 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 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 @@
- 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 -Nur linux-4.6.6.orig/arch/x86/crypto/glue_helper.c linux-4.6.6/arch/x86/crypto/glue_helper.c
---- linux-4.6.6.orig/arch/x86/crypto/glue_helper.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/crypto/glue_helper.c 2016-08-22 21:27:46.565838732 +0200
-@@ -39,7 +39,7 @@
- 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 @@
- 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 @@
- }
-
- done:
-+ glue_fpu_end(fpu_enabled);
- err = blkcipher_walk_done(desc, walk, nbytes);
- }
-
-- glue_fpu_end(fpu_enabled);
- return err;
- }
-
-@@ -194,7 +194,7 @@
- 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 @@
-
- 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 @@
- 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 @@
-
- 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 @@
- 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 @@
-
- /* 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 -Nur linux-4.6.6.orig/arch/x86/entry/common.c linux-4.6.6/arch/x86/entry/common.c
---- linux-4.6.6.orig/arch/x86/entry/common.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/entry/common.c 2016-08-22 21:27:46.577839498 +0200
-@@ -202,7 +202,7 @@
-
- #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 @@
- /* 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 -Nur linux-4.6.6.orig/arch/x86/entry/entry_32.S linux-4.6.6/arch/x86/entry/entry_32.S
---- linux-4.6.6.orig/arch/x86/entry/entry_32.S 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/entry/entry_32.S 2016-08-22 21:27:46.577839498 +0200
-@@ -278,8 +278,24 @@
- 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 -Nur linux-4.6.6.orig/arch/x86/entry/entry_64.S linux-4.6.6/arch/x86/entry/entry_64.S
---- linux-4.6.6.orig/arch/x86/entry/entry_64.S 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/entry/entry_64.S 2016-08-22 21:27:46.581839759 +0200
-@@ -511,7 +511,23 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/arch/x86/include/asm/preempt.h linux-4.6.6/arch/x86/include/asm/preempt.h
---- linux-4.6.6.orig/arch/x86/include/asm/preempt.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/include/asm/preempt.h 2016-08-22 21:27:46.585840012 +0200
-@@ -79,17 +79,33 @@
- * 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 -Nur linux-4.6.6.orig/arch/x86/include/asm/signal.h linux-4.6.6/arch/x86/include/asm/signal.h
---- linux-4.6.6.orig/arch/x86/include/asm/signal.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/include/asm/signal.h 2016-08-22 21:27:46.585840012 +0200
-@@ -23,6 +23,19 @@
- 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 -Nur linux-4.6.6.orig/arch/x86/include/asm/stackprotector.h linux-4.6.6/arch/x86/include/asm/stackprotector.h
---- linux-4.6.6.orig/arch/x86/include/asm/stackprotector.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/include/asm/stackprotector.h 2016-08-22 21:27:46.585840012 +0200
-@@ -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 @@
- * 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 -Nur linux-4.6.6.orig/arch/x86/include/asm/thread_info.h linux-4.6.6/arch/x86/include/asm/thread_info.h
---- linux-4.6.6.orig/arch/x86/include/asm/thread_info.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/include/asm/thread_info.h 2016-08-22 21:27:46.589840272 +0200
-@@ -58,6 +58,8 @@
- __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 @@
- #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 @@
- #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 @@
- #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 -Nur linux-4.6.6.orig/arch/x86/include/asm/tlbflush.h linux-4.6.6/arch/x86/include/asm/tlbflush.h
---- linux-4.6.6.orig/arch/x86/include/asm/tlbflush.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/include/asm/tlbflush.h 2016-08-22 21:27:46.589840272 +0200
-@@ -135,7 +135,14 @@
-
- static inline void __native_flush_tlb(void)
- {
-+ /*
-+ * if current->mm == NULL then we borrow a mm which may change during a
-+ * task switch and therefore we must not be preempted while we write CR3
-+ * back.
-+ */
-+ preempt_disable();
- native_write_cr3(native_read_cr3());
-+ preempt_enable();
- }
-
- static inline void __native_flush_tlb_global_irq_disabled(void)
-diff -Nur linux-4.6.6.orig/arch/x86/include/asm/uv/uv_bau.h linux-4.6.6/arch/x86/include/asm/uv/uv_bau.h
---- linux-4.6.6.orig/arch/x86/include/asm/uv/uv_bau.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/include/asm/uv/uv_bau.h 2016-08-22 21:27:46.593840525 +0200
-@@ -615,9 +615,9 @@
- 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 @@
- * 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 -Nur linux-4.6.6.orig/arch/x86/include/asm/uv/uv_hub.h linux-4.6.6/arch/x86/include/asm/uv/uv_hub.h
---- linux-4.6.6.orig/arch/x86/include/asm/uv/uv_hub.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/include/asm/uv/uv_hub.h 2016-08-22 21:27:46.593840525 +0200
-@@ -492,7 +492,7 @@
- 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 -Nur linux-4.6.6.orig/arch/x86/Kconfig linux-4.6.6/arch/x86/Kconfig
---- linux-4.6.6.orig/arch/x86/Kconfig 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/Kconfig 2016-08-22 21:27:46.549837706 +0200
-@@ -17,6 +17,7 @@
- ### 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 @@
- 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 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 -Nur linux-4.6.6.orig/arch/x86/kernel/apic/io_apic.c linux-4.6.6/arch/x86/kernel/apic/io_apic.c
---- linux-4.6.6.orig/arch/x86/kernel/apic/io_apic.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/kernel/apic/io_apic.c 2016-08-22 21:27:46.605841298 +0200
-@@ -1711,7 +1711,8 @@
- 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 -Nur linux-4.6.6.orig/arch/x86/kernel/apic/x2apic_uv_x.c linux-4.6.6/arch/x86/kernel/apic/x2apic_uv_x.c
---- linux-4.6.6.orig/arch/x86/kernel/apic/x2apic_uv_x.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/kernel/apic/x2apic_uv_x.c 2016-08-22 21:27:46.617842064 +0200
-@@ -755,7 +755,7 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/arch/x86/kernel/asm-offsets.c linux-4.6.6/arch/x86/kernel/asm-offsets.c
---- linux-4.6.6.orig/arch/x86/kernel/asm-offsets.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/kernel/asm-offsets.c 2016-08-22 21:27:46.617842064 +0200
-@@ -32,6 +32,7 @@
- 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 @@
-
- BLANK();
- DEFINE(PTREGS_SIZE, sizeof(struct pt_regs));
-+ DEFINE(_PREEMPT_ENABLED, PREEMPT_ENABLED);
- }
-diff -Nur linux-4.6.6.orig/arch/x86/kernel/cpu/mcheck/mce.c linux-4.6.6/arch/x86/kernel/cpu/mcheck/mce.c
---- linux-4.6.6.orig/arch/x86/kernel/cpu/mcheck/mce.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/kernel/cpu/mcheck/mce.c 2016-08-22 21:27:46.629842834 +0200
-@@ -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 @@
- 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)(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 @@
-
- done:
- __this_cpu_write(mce_next_interval, iv);
-- __restart_timer(t, iv);
-+ return __restart_timer(timer, iv);
- }
-
- /*
-@@ -1305,7 +1293,7 @@
- */
- 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 @@
- 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 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(&notify_work, __mce_notify_work);
-+ notify_work_ready = true;
-+ return 0;
-+}
-+
-+static void mce_notify_work(void)
-+{
-+ if (notify_work_ready)
-+ swork_queue(&notify_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 @@
- */
- 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 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 @@
-
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/arch/x86/kernel/dumpstack_32.c linux-4.6.6/arch/x86/kernel/dumpstack_32.c
---- linux-4.6.6.orig/arch/x86/kernel/dumpstack_32.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/kernel/dumpstack_32.c 2016-08-22 21:27:46.633843092 +0200
-@@ -42,7 +42,7 @@
- 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 @@
- break;
- touch_nmi_watchdog();
- }
-- put_cpu();
-+ put_cpu_light();
- }
- EXPORT_SYMBOL(dump_trace);
-
-diff -Nur linux-4.6.6.orig/arch/x86/kernel/dumpstack_64.c linux-4.6.6/arch/x86/kernel/dumpstack_64.c
---- linux-4.6.6.orig/arch/x86/kernel/dumpstack_64.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/kernel/dumpstack_64.c 2016-08-22 21:27:46.633843092 +0200
-@@ -152,7 +152,7 @@
- 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 @@
- * 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/arch/x86/kernel/irq_32.c linux-4.6.6/arch/x86/kernel/irq_32.c
---- linux-4.6.6.orig/arch/x86/kernel/irq_32.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/kernel/irq_32.c 2016-08-22 21:27:46.637843343 +0200
-@@ -128,6 +128,7 @@
- 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 @@
-
- call_on_stack(__do_softirq, isp);
- }
-+#endif
-
- bool handle_irq(struct irq_desc *desc, struct pt_regs *regs)
- {
-diff -Nur linux-4.6.6.orig/arch/x86/kernel/process_32.c linux-4.6.6/arch/x86/kernel/process_32.c
---- linux-4.6.6.orig/arch/x86/kernel/process_32.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/kernel/process_32.c 2016-08-22 21:27:46.641843602 +0200
-@@ -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 @@
- }
- 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 @@
- 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 -Nur linux-4.6.6.orig/arch/x86/kvm/lapic.c linux-4.6.6/arch/x86/kvm/lapic.c
---- linux-4.6.6.orig/arch/x86/kvm/lapic.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/kvm/lapic.c 2016-08-22 21:27:46.649844115 +0200
-@@ -1870,6 +1870,7 @@
- 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 -Nur linux-4.6.6.orig/arch/x86/kvm/x86.c linux-4.6.6/arch/x86/kvm/x86.c
---- linux-4.6.6.orig/arch/x86/kvm/x86.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/kvm/x86.c 2016-08-22 21:27:46.665845141 +0200
-@@ -5855,6 +5855,13 @@
- 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 -Nur linux-4.6.6.orig/arch/x86/mm/highmem_32.c linux-4.6.6/arch/x86/mm/highmem_32.c
---- linux-4.6.6.orig/arch/x86/mm/highmem_32.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/mm/highmem_32.c 2016-08-22 21:27:46.673845654 +0200
-@@ -32,10 +32,11 @@
- */
- 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 @@
- 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 @@
- * 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 @@
- #endif
-
- pagefault_enable();
-- preempt_enable();
-+ preempt_enable_nort();
- }
- EXPORT_SYMBOL(__kunmap_atomic);
-
-diff -Nur linux-4.6.6.orig/arch/x86/mm/iomap_32.c linux-4.6.6/arch/x86/mm/iomap_32.c
---- linux-4.6.6.orig/arch/x86/mm/iomap_32.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/mm/iomap_32.c 2016-08-22 21:27:46.673845654 +0200
-@@ -56,6 +56,7 @@
-
- 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 @@
- 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 @@
- * 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 -Nur linux-4.6.6.orig/arch/x86/platform/uv/tlb_uv.c linux-4.6.6/arch/x86/platform/uv/tlb_uv.c
---- linux-4.6.6.orig/arch/x86/platform/uv/tlb_uv.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/platform/uv/tlb_uv.c 2016-08-22 21:27:46.681846167 +0200
-@@ -714,9 +714,9 @@
-
- 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 @@
-
- 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 @@
- 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 @@
- }
- }
- }
-- 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 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 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/arch/x86/platform/uv/uv_time.c linux-4.6.6/arch/x86/platform/uv/uv_time.c
---- linux-4.6.6.orig/arch/x86/platform/uv/uv_time.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/arch/x86/platform/uv/uv_time.c 2016-08-22 21:27:46.681846167 +0200
-@@ -57,7 +57,7 @@
-
- /* 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 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 -Nur linux-4.6.6.orig/block/blk-core.c linux-4.6.6/block/blk-core.c
---- linux-4.6.6.orig/block/blk-core.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/block/blk-core.c 2016-08-22 21:27:46.693846941 +0200
-@@ -125,6 +125,9 @@
-
- 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 @@
- **/
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- */
- if (q)
- queue_unplugged(q, depth, from_schedule);
--
-- local_irq_restore(flags);
- }
-
- void blk_finish_plug(struct blk_plug *plug)
-diff -Nur linux-4.6.6.orig/block/blk-ioc.c linux-4.6.6/block/blk-ioc.c
---- linux-4.6.6.orig/block/blk-ioc.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/block/blk-ioc.c 2016-08-22 21:27:46.697847194 +0200
-@@ -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 @@
- 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 @@
- spin_unlock(icq->q->queue_lock);
- } else {
- spin_unlock_irqrestore(&ioc->lock, flags);
-- cpu_relax();
-+ cpu_chill();
- goto retry;
- }
- }
-diff -Nur linux-4.6.6.orig/block/blk-mq.c linux-4.6.6/block/blk-mq.c
---- linux-4.6.6.orig/block/blk-mq.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/block/blk-mq.c 2016-08-22 21:27:46.705847707 +0200
-@@ -92,7 +92,7 @@
-
- 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 @@
- 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 @@
- * 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 @@
- 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 @@
- }
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- {
- 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 -Nur linux-4.6.6.orig/block/blk-mq-cpu.c linux-4.6.6/block/blk-mq-cpu.c
---- linux-4.6.6.orig/block/blk-mq-cpu.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/block/blk-mq-cpu.c 2016-08-22 21:27:46.701847454 +0200
-@@ -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 @@
- 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 @@
- break;
- }
-
-- raw_spin_unlock(&blk_mq_cpu_notify_lock);
-+ spin_unlock(&blk_mq_cpu_notify_lock);
- return ret;
- }
-
-@@ -41,16 +44,16 @@
- {
- BUG_ON(!notifier->notify);
-
-- raw_spin_lock(&blk_mq_cpu_notify_lock);
-+ spin_lock(&blk_mq_cpu_notify_lock);
- list_add_tail(&notifier->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(&notifier->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 -Nur linux-4.6.6.orig/block/blk-mq.h linux-4.6.6/block/blk-mq.h
---- linux-4.6.6.orig/block/blk-mq.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/block/blk-mq.h 2016-08-22 21:27:46.705847707 +0200
-@@ -86,12 +86,12 @@
- */
- 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 -Nur linux-4.6.6.orig/block/blk-softirq.c linux-4.6.6/block/blk-softirq.c
---- linux-4.6.6.orig/block/blk-softirq.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/block/blk-softirq.c 2016-08-22 21:27:46.705847707 +0200
-@@ -51,6 +51,7 @@
- raise_softirq_irqoff(BLOCK_SOFTIRQ);
-
- local_irq_restore(flags);
-+ preempt_check_resched_rt();
- }
-
- /*
-@@ -93,6 +94,7 @@
- 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 @@
- goto do_local;
-
- local_irq_restore(flags);
-+ preempt_check_resched_rt();
- }
-
- /**
-diff -Nur linux-4.6.6.orig/block/bounce.c linux-4.6.6/block/bounce.c
---- linux-4.6.6.orig/block/bounce.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/block/bounce.c 2016-08-22 21:27:46.705847707 +0200
-@@ -55,11 +55,11 @@
- 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 -Nur linux-4.6.6.orig/block/genhd.c linux-4.6.6/block/genhd.c
---- linux-4.6.6.orig/block/genhd.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/block/genhd.c 2016-08-22 21:27:46.709847967 +0200
-@@ -1523,12 +1523,7 @@
- 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 -Nur linux-4.6.6.orig/crypto/algapi.c linux-4.6.6/crypto/algapi.c
---- linux-4.6.6.orig/crypto/algapi.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/crypto/algapi.c 2016-08-22 21:27:46.721848733 +0200
-@@ -718,13 +718,13 @@
-
- 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 -Nur linux-4.6.6.orig/crypto/api.c linux-4.6.6/crypto/api.c
---- linux-4.6.6.orig/crypto/api.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/crypto/api.c 2016-08-22 21:27:46.721848733 +0200
-@@ -31,7 +31,7 @@
- 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 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 -Nur linux-4.6.6.orig/crypto/internal.h linux-4.6.6/crypto/internal.h
---- linux-4.6.6.orig/crypto/internal.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/crypto/internal.h 2016-08-22 21:27:46.725848993 +0200
-@@ -47,7 +47,7 @@
-
- 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 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 -Nur linux-4.6.6.orig/Documentation/hwlat_detector.txt linux-4.6.6/Documentation/hwlat_detector.txt
---- linux-4.6.6.orig/Documentation/hwlat_detector.txt 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/Documentation/hwlat_detector.txt 2016-08-22 21:27:46.213816153 +0200
-@@ -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 -Nur linux-4.6.6.orig/Documentation/sysrq.txt linux-4.6.6/Documentation/sysrq.txt
---- linux-4.6.6.orig/Documentation/sysrq.txt 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/Documentation/sysrq.txt 2016-08-22 21:27:46.225816925 +0200
-@@ -59,10 +59,17 @@
- 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 -Nur linux-4.6.6.orig/Documentation/trace/histograms.txt linux-4.6.6/Documentation/trace/histograms.txt
---- linux-4.6.6.orig/Documentation/trace/histograms.txt 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/Documentation/trace/histograms.txt 2016-08-22 21:27:46.229817185 +0200
-@@ -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 -Nur linux-4.6.6.orig/drivers/acpi/acpica/acglobal.h linux-4.6.6/drivers/acpi/acpica/acglobal.h
---- linux-4.6.6.orig/drivers/acpi/acpica/acglobal.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/acpi/acpica/acglobal.h 2016-08-22 21:27:46.733849506 +0200
-@@ -116,7 +116,7 @@
- * 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 -Nur linux-4.6.6.orig/drivers/acpi/acpica/hwregs.c linux-4.6.6/drivers/acpi/acpica/hwregs.c
---- linux-4.6.6.orig/drivers/acpi/acpica/hwregs.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/acpi/acpica/hwregs.c 2016-08-22 21:27:46.741850019 +0200
-@@ -269,14 +269,14 @@
- 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 -Nur linux-4.6.6.orig/drivers/acpi/acpica/hwxface.c linux-4.6.6/drivers/acpi/acpica/hwxface.c
---- linux-4.6.6.orig/drivers/acpi/acpica/hwxface.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/acpi/acpica/hwxface.c 2016-08-22 21:27:46.745850272 +0200
-@@ -374,7 +374,7 @@
- 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 @@
-
- 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 -Nur linux-4.6.6.orig/drivers/acpi/acpica/utmutex.c linux-4.6.6/drivers/acpi/acpica/utmutex.c
---- linux-4.6.6.orig/drivers/acpi/acpica/utmutex.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/acpi/acpica/utmutex.c 2016-08-22 21:27:46.769851812 +0200
-@@ -88,7 +88,7 @@
- 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 @@
- /* 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 -Nur linux-4.6.6.orig/drivers/ata/libata-sff.c linux-4.6.6/drivers/ata/libata-sff.c
---- linux-4.6.6.orig/drivers/ata/libata-sff.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/ata/libata-sff.c 2016-08-22 21:27:46.781852585 +0200
-@@ -678,9 +678,9 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/block/zram/zram_drv.c linux-4.6.6/drivers/block/zram/zram_drv.c
---- linux-4.6.6.orig/drivers/block/zram/zram_drv.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/block/zram/zram_drv.c 2016-08-22 21:27:46.789853098 +0200
-@@ -520,6 +520,8 @@
- goto out_error;
- }
-
-+ zram_meta_init_table_locks(meta, disksize);
-+
- return meta;
-
- out_error:
-@@ -568,12 +570,12 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- * 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 @@
- }
-
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/block/zram/zram_drv.h linux-4.6.6/drivers/block/zram/zram_drv.h
---- linux-4.6.6.orig/drivers/block/zram/zram_drv.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/block/zram/zram_drv.h 2016-08-22 21:27:46.789853098 +0200
-@@ -72,6 +72,9 @@
- 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 @@
- */
- 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 -Nur linux-4.6.6.orig/drivers/char/random.c linux-4.6.6/drivers/char/random.c
---- linux-4.6.6.orig/drivers/char/random.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/char/random.c 2016-08-22 21:27:46.797853611 +0200
-@@ -796,8 +796,6 @@
- } sample;
- long delta, delta2, delta3;
-
-- preempt_disable();
--
- sample.jiffies = jiffies;
- sample.cycles = random_get_entropy();
- sample.num = num;
-@@ -838,7 +836,6 @@
- */
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/clocksource/tcb_clksrc.c linux-4.6.6/drivers/clocksource/tcb_clksrc.c
---- linux-4.6.6.orig/drivers/clocksource/tcb_clksrc.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/clocksource/tcb_clksrc.c 2016-08-22 21:27:46.805854124 +0200
-@@ -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 @@
- struct tc_clkevt_device {
- struct clock_event_device clkevt;
- struct clk *clk;
-+ bool clk_enabled;
-+ u32 freq;
- void __iomem *regs;
- };
-
-@@ -82,15 +83,26 @@
- 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 @@
-
- __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 @@
- 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 @@
- /* 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 @@
- .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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/clocksource/timer-atmel-pit.c linux-4.6.6/drivers/clocksource/timer-atmel-pit.c
---- linux-4.6.6.orig/drivers/clocksource/timer-atmel-pit.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/clocksource/timer-atmel-pit.c 2016-08-22 21:27:46.805854124 +0200
-@@ -46,6 +46,7 @@
- u32 cycle;
- u32 cnt;
- unsigned int irq;
-+ bool irq_requested;
- struct clk *mck;
- };
-
-@@ -96,15 +97,29 @@
-
- /* 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 @@
- {
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/clocksource/timer-atmel-st.c linux-4.6.6/drivers/clocksource/timer-atmel-st.c
---- linux-4.6.6.orig/drivers/clocksource/timer-atmel-st.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/clocksource/timer-atmel-st.c 2016-08-22 21:27:46.805854124 +0200
-@@ -115,18 +115,29 @@
- 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_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 @@
- {
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/cpufreq/Kconfig.x86 linux-4.6.6/drivers/cpufreq/Kconfig.x86
---- linux-4.6.6.orig/drivers/cpufreq/Kconfig.x86 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/cpufreq/Kconfig.x86 2016-08-22 21:27:46.809854377 +0200
-@@ -123,7 +123,7 @@
-
- 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 -Nur linux-4.6.6.orig/drivers/crypto/ccp/ccp-dev.c linux-4.6.6/drivers/crypto/ccp/ccp-dev.c
---- linux-4.6.6.orig/drivers/crypto/ccp/ccp-dev.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/crypto/ccp/ccp-dev.c 2016-08-22 21:27:46.813854637 +0200
-@@ -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 -Nur linux-4.6.6.orig/drivers/gpu/drm/i915/i915_drv.h linux-4.6.6/drivers/gpu/drm/i915/i915_drv.h
---- linux-4.6.6.orig/drivers/gpu/drm/i915/i915_drv.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/gpu/drm/i915/i915_drv.h 2016-08-22 21:27:46.833855915 +0200
-@@ -714,7 +714,7 @@
- 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 -Nur linux-4.6.6.orig/drivers/gpu/drm/i915/i915_gem_execbuffer.c linux-4.6.6/drivers/gpu/drm/i915/i915_gem_execbuffer.c
---- linux-4.6.6.orig/drivers/gpu/drm/i915/i915_gem_execbuffer.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/gpu/drm/i915/i915_gem_execbuffer.c 2016-08-22 21:27:46.845856688 +0200
-@@ -1314,7 +1314,9 @@
- 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 -Nur linux-4.6.6.orig/drivers/gpu/drm/i915/i915_gem_shrinker.c linux-4.6.6/drivers/gpu/drm/i915/i915_gem_shrinker.c
---- linux-4.6.6.orig/drivers/gpu/drm/i915/i915_gem_shrinker.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/gpu/drm/i915/i915_gem_shrinker.c 2016-08-22 21:27:46.845856688 +0200
-@@ -39,7 +39,7 @@
- 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 -Nur linux-4.6.6.orig/drivers/gpu/drm/i915/i915_irq.c linux-4.6.6/drivers/gpu/drm/i915/i915_irq.c
---- linux-4.6.6.orig/drivers/gpu/drm/i915/i915_irq.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/gpu/drm/i915/i915_irq.c 2016-08-22 21:27:46.865857967 +0200
-@@ -830,6 +830,7 @@
- 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 @@
- *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 -Nur linux-4.6.6.orig/drivers/gpu/drm/i915/intel_display.c linux-4.6.6/drivers/gpu/drm/i915/intel_display.c
---- linux-4.6.6.orig/drivers/gpu/drm/i915/intel_display.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/gpu/drm/i915/intel_display.c 2016-08-22 21:27:46.905860533 +0200
-@@ -11496,7 +11496,7 @@
- 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 -Nur linux-4.6.6.orig/drivers/gpu/drm/i915/intel_sprite.c linux-4.6.6/drivers/gpu/drm/i915/intel_sprite.c
---- linux-4.6.6.orig/drivers/gpu/drm/i915/intel_sprite.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/gpu/drm/i915/intel_sprite.c 2016-08-22 21:27:46.917861306 +0200
-@@ -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 @@
- 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 @@
- 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 @@
- 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 @@
-
- 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 -Nur linux-4.6.6.orig/drivers/gpu/drm/i915/intel_uncore.c linux-4.6.6/drivers/gpu/drm/i915/intel_uncore.c
---- linux-4.6.6.orig/drivers/gpu/drm/i915/intel_uncore.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/gpu/drm/i915/intel_uncore.c 2016-08-22 21:27:46.921861559 +0200
-@@ -60,7 +60,11 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- if (--domain->wake_count)
- continue;
-
-- domain->wake_count++;
- fw_domain_arm_timer(domain);
- }
- }
-@@ -732,7 +739,6 @@
- continue;
- }
-
-- domain->wake_count++;
- fw_domain_arm_timer(domain);
- }
-
-@@ -1150,7 +1156,8 @@
- 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 -Nur linux-4.6.6.orig/drivers/gpu/drm/radeon/radeon_display.c linux-4.6.6/drivers/gpu/drm/radeon/radeon_display.c
---- linux-4.6.6.orig/drivers/gpu/drm/radeon/radeon_display.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/gpu/drm/radeon/radeon_display.c 2016-08-22 21:27:46.929862072 +0200
-@@ -1863,6 +1863,7 @@
- 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 @@
- *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 -Nur linux-4.6.6.orig/drivers/i2c/busses/i2c-omap.c linux-4.6.6/drivers/i2c/busses/i2c-omap.c
---- linux-4.6.6.orig/drivers/i2c/busses/i2c-omap.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/i2c/busses/i2c-omap.c 2016-08-22 21:27:46.945863099 +0200
-@@ -995,15 +995,12 @@
- 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 -Nur linux-4.6.6.orig/drivers/ide/alim15x3.c linux-4.6.6/drivers/ide/alim15x3.c
---- linux-4.6.6.orig/drivers/ide/alim15x3.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/ide/alim15x3.c 2016-08-22 21:27:46.949863359 +0200
-@@ -234,7 +234,7 @@
-
- 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 @@
- }
- pci_dev_put(north);
- pci_dev_put(isa_dev);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- return 0;
- }
-
-diff -Nur linux-4.6.6.orig/drivers/ide/hpt366.c linux-4.6.6/drivers/ide/hpt366.c
---- linux-4.6.6.orig/drivers/ide/hpt366.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/ide/hpt366.c 2016-08-22 21:27:46.953863612 +0200
-@@ -1236,7 +1236,7 @@
-
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/ide/ide-io.c linux-4.6.6/drivers/ide/ide-io.c
---- linux-4.6.6.orig/drivers/ide/ide-io.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/ide/ide-io.c 2016-08-22 21:27:46.957863872 +0200
-@@ -659,7 +659,7 @@
- /* 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 -Nur linux-4.6.6.orig/drivers/ide/ide-iops.c linux-4.6.6/drivers/ide/ide-iops.c
---- linux-4.6.6.orig/drivers/ide/ide-iops.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/ide/ide-iops.c 2016-08-22 21:27:46.957863872 +0200
-@@ -129,12 +129,12 @@
- 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 -Nur linux-4.6.6.orig/drivers/ide/ide-io-std.c linux-4.6.6/drivers/ide/ide-io-std.c
---- linux-4.6.6.orig/drivers/ide/ide-io-std.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/ide/ide-io-std.c 2016-08-22 21:27:46.957863872 +0200
-@@ -175,7 +175,7 @@
- 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 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/ide/ide-probe.c linux-4.6.6/drivers/ide/ide-probe.c
---- linux-4.6.6.orig/drivers/ide/ide-probe.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/ide/ide-probe.c 2016-08-22 21:27:46.961864125 +0200
-@@ -196,10 +196,10 @@
- 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 -Nur linux-4.6.6.orig/drivers/ide/ide-taskfile.c linux-4.6.6/drivers/ide/ide-taskfile.c
---- linux-4.6.6.orig/drivers/ide/ide-taskfile.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/ide/ide-taskfile.c 2016-08-22 21:27:46.961864125 +0200
-@@ -250,7 +250,7 @@
-
- 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 @@
- kunmap_atomic(buf);
-
- if (page_is_high)
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
-
- len -= nr_bytes;
- }
-@@ -414,7 +414,7 @@
- }
-
- 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 -Nur linux-4.6.6.orig/drivers/infiniband/ulp/ipoib/ipoib_ib.c linux-4.6.6/drivers/infiniband/ulp/ipoib/ipoib_ib.c
---- linux-4.6.6.orig/drivers/infiniband/ulp/ipoib/ipoib_ib.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/infiniband/ulp/ipoib/ipoib_ib.c 2016-08-22 21:27:46.969864638 +0200
-@@ -51,8 +51,6 @@
- "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 -Nur linux-4.6.6.orig/drivers/infiniband/ulp/ipoib/ipoib_multicast.c linux-4.6.6/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
---- linux-4.6.6.orig/drivers/infiniband/ulp/ipoib/ipoib_multicast.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/infiniband/ulp/ipoib/ipoib_multicast.c 2016-08-22 21:27:46.969864638 +0200
-@@ -883,7 +883,7 @@
-
- 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 @@
-
- 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 -Nur linux-4.6.6.orig/drivers/input/gameport/gameport.c linux-4.6.6/drivers/input/gameport/gameport.c
---- linux-4.6.6.orig/drivers/input/gameport/gameport.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/input/gameport/gameport.c 2016-08-22 21:27:46.977865151 +0200
-@@ -91,13 +91,13 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/iommu/amd_iommu.c linux-4.6.6/drivers/iommu/amd_iommu.c
---- linux-4.6.6.orig/drivers/iommu/amd_iommu.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/iommu/amd_iommu.c 2016-08-22 21:27:46.997866437 +0200
-@@ -2165,10 +2165,10 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/leds/trigger/Kconfig linux-4.6.6/drivers/leds/trigger/Kconfig
---- linux-4.6.6.orig/drivers/leds/trigger/Kconfig 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/leds/trigger/Kconfig 2016-08-22 21:27:47.005866951 +0200
-@@ -61,7 +61,7 @@
-
- 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 -Nur linux-4.6.6.orig/drivers/md/bcache/Kconfig linux-4.6.6/drivers/md/bcache/Kconfig
---- linux-4.6.6.orig/drivers/md/bcache/Kconfig 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/md/bcache/Kconfig 2016-08-22 21:27:47.009867204 +0200
-@@ -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 -Nur linux-4.6.6.orig/drivers/md/dm.c linux-4.6.6/drivers/md/dm.c
---- linux-4.6.6.orig/drivers/md/dm.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/md/dm.c 2016-08-22 21:27:47.025868232 +0200
-@@ -2187,7 +2187,7 @@
- /* 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 -Nur linux-4.6.6.orig/drivers/md/raid5.c linux-4.6.6/drivers/md/raid5.c
---- linux-4.6.6.orig/drivers/md/raid5.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/md/raid5.c 2016-08-22 21:27:47.041869254 +0200
-@@ -1918,8 +1918,9 @@
- 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 @@
- 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 @@
- __func__, cpu);
- break;
- }
-+ spin_lock_init(&per_cpu_ptr(conf->percpu, cpu)->lock);
- }
- put_online_cpus();
-
-diff -Nur linux-4.6.6.orig/drivers/md/raid5.h linux-4.6.6/drivers/md/raid5.h
---- linux-4.6.6.orig/drivers/md/raid5.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/md/raid5.h 2016-08-22 21:27:47.041869254 +0200
-@@ -504,6 +504,7 @@
- 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 -Nur linux-4.6.6.orig/drivers/misc/hwlat_detector.c linux-4.6.6/drivers/misc/hwlat_detector.c
---- linux-4.6.6.orig/drivers/misc/hwlat_detector.c 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/drivers/misc/hwlat_detector.c 2016-08-22 21:27:47.053870028 +0200
-@@ -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 -Nur linux-4.6.6.orig/drivers/misc/Kconfig linux-4.6.6/drivers/misc/Kconfig
---- linux-4.6.6.orig/drivers/misc/Kconfig 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/misc/Kconfig 2016-08-22 21:27:47.049869767 +0200
-@@ -54,6 +54,7 @@
- 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 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/misc/Makefile linux-4.6.6/drivers/misc/Makefile
---- linux-4.6.6.orig/drivers/misc/Makefile 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/misc/Makefile 2016-08-22 21:27:47.049869767 +0200
-@@ -39,6 +39,7 @@
- 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 -Nur linux-4.6.6.orig/drivers/mmc/host/jz4740_mmc.c linux-4.6.6/drivers/mmc/host/jz4740_mmc.c
---- linux-4.6.6.orig/drivers/mmc/host/jz4740_mmc.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/mmc/host/jz4740_mmc.c 2016-08-22 21:27:47.061870541 +0200
-@@ -1068,8 +1068,6 @@
- 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 -Nur linux-4.6.6.orig/drivers/mmc/host/mmci.c linux-4.6.6/drivers/mmc/host/mmci.c
---- linux-4.6.6.orig/drivers/mmc/host/mmci.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/mmc/host/mmci.c 2016-08-22 21:27:47.069871054 +0200
-@@ -1155,15 +1155,12 @@
- 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 @@
-
- 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 -Nur linux-4.6.6.orig/drivers/net/ethernet/3com/3c59x.c linux-4.6.6/drivers/net/ethernet/3com/3c59x.c
---- linux-4.6.6.orig/drivers/net/ethernet/3com/3c59x.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/net/ethernet/3com/3c59x.c 2016-08-22 21:27:47.081871820 +0200
-@@ -842,9 +842,9 @@
- {
- 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 @@
- * 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 -Nur linux-4.6.6.orig/drivers/net/ethernet/atheros/atl1c/atl1c_main.c linux-4.6.6/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
---- linux-4.6.6.orig/drivers/net/ethernet/atheros/atl1c/atl1c_main.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/net/ethernet/atheros/atl1c/atl1c_main.c 2016-08-22 21:27:47.093872593 +0200
-@@ -2217,11 +2217,7 @@
- }
-
- 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 -Nur linux-4.6.6.orig/drivers/net/ethernet/atheros/atl1e/atl1e_main.c linux-4.6.6/drivers/net/ethernet/atheros/atl1e/atl1e_main.c
---- linux-4.6.6.orig/drivers/net/ethernet/atheros/atl1e/atl1e_main.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/net/ethernet/atheros/atl1e/atl1e_main.c 2016-08-22 21:27:47.101873106 +0200
-@@ -1880,8 +1880,7 @@
- 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 -Nur linux-4.6.6.orig/drivers/net/ethernet/chelsio/cxgb/sge.c linux-4.6.6/drivers/net/ethernet/chelsio/cxgb/sge.c
---- linux-4.6.6.orig/drivers/net/ethernet/chelsio/cxgb/sge.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/net/ethernet/chelsio/cxgb/sge.c 2016-08-22 21:27:47.113873872 +0200
-@@ -1664,8 +1664,7 @@
- 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 -Nur linux-4.6.6.orig/drivers/net/ethernet/neterion/s2io.c linux-4.6.6/drivers/net/ethernet/neterion/s2io.c
---- linux-4.6.6.orig/drivers/net/ethernet/neterion/s2io.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/net/ethernet/neterion/s2io.c 2016-08-22 21:27:47.141875672 +0200
-@@ -4084,12 +4084,7 @@
- [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 -Nur linux-4.6.6.orig/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c linux-4.6.6/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
---- linux-4.6.6.orig/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c 2016-08-22 21:27:47.149876185 +0200
-@@ -2137,10 +2137,8 @@
- 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 -Nur linux-4.6.6.orig/drivers/net/ethernet/realtek/8139too.c linux-4.6.6/drivers/net/ethernet/realtek/8139too.c
---- linux-4.6.6.orig/drivers/net/ethernet/realtek/8139too.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/net/ethernet/realtek/8139too.c 2016-08-22 21:27:47.157876698 +0200
-@@ -2229,7 +2229,7 @@
- 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 -Nur linux-4.6.6.orig/drivers/net/ethernet/tehuti/tehuti.c linux-4.6.6/drivers/net/ethernet/tehuti/tehuti.c
---- linux-4.6.6.orig/drivers/net/ethernet/tehuti/tehuti.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/net/ethernet/tehuti/tehuti.c 2016-08-22 21:27:47.165877211 +0200
-@@ -1629,13 +1629,8 @@
- 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 -Nur linux-4.6.6.orig/drivers/net/ethernet/tile/tilepro.c linux-4.6.6/drivers/net/ethernet/tile/tilepro.c
---- linux-4.6.6.orig/drivers/net/ethernet/tile/tilepro.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/net/ethernet/tile/tilepro.c 2016-08-22 21:27:47.173877724 +0200
-@@ -588,7 +588,7 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/net/rionet.c linux-4.6.6/drivers/net/rionet.c
---- linux-4.6.6.orig/drivers/net/rionet.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/net/rionet.c 2016-08-22 21:27:47.181878237 +0200
-@@ -179,11 +179,7 @@
- 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 -Nur linux-4.6.6.orig/drivers/net/wireless/intersil/orinoco/orinoco_usb.c linux-4.6.6/drivers/net/wireless/intersil/orinoco/orinoco_usb.c
---- linux-4.6.6.orig/drivers/net/wireless/intersil/orinoco/orinoco_usb.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/net/wireless/intersil/orinoco/orinoco_usb.c 2016-08-22 21:27:47.193879004 +0200
-@@ -697,7 +697,7 @@
- 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 -Nur linux-4.6.6.orig/drivers/pci/access.c linux-4.6.6/drivers/pci/access.c
---- linux-4.6.6.orig/drivers/pci/access.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/pci/access.c 2016-08-22 21:27:47.201879517 +0200
-@@ -672,7 +672,7 @@
- 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 -Nur linux-4.6.6.orig/drivers/power/bq27xxx_battery.c linux-4.6.6/drivers/power/bq27xxx_battery.c
---- linux-4.6.6.orig/drivers/power/bq27xxx_battery.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/power/bq27xxx_battery.c 2016-08-22 21:27:47.213880286 +0200
-@@ -735,11 +735,8 @@
-
- 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 -Nur linux-4.6.6.orig/drivers/scsi/fcoe/fcoe.c linux-4.6.6/drivers/scsi/fcoe/fcoe.c
---- linux-4.6.6.orig/drivers/scsi/fcoe/fcoe.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/scsi/fcoe/fcoe.c 2016-08-22 21:27:47.221880796 +0200
-@@ -1286,7 +1286,7 @@
- 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 @@
- 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_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 @@
- 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;
- }
-
-@@ -1814,7 +1814,7 @@
- */
- hp = (struct fcoe_hdr *) skb_network_header(skb);
-
-- stats = per_cpu_ptr(lport->stats, get_cpu());
-+ stats = per_cpu_ptr(lport->stats, get_cpu_light());
- if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
- if (stats->ErrorFrames < 5)
- printk(KERN_WARNING "fcoe: FCoE version "
-@@ -1846,13 +1846,13 @@
- 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 -Nur linux-4.6.6.orig/drivers/scsi/fcoe/fcoe_ctlr.c linux-4.6.6/drivers/scsi/fcoe/fcoe_ctlr.c
---- linux-4.6.6.orig/drivers/scsi/fcoe/fcoe_ctlr.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/scsi/fcoe/fcoe_ctlr.c 2016-08-22 21:27:47.233881568 +0200
-@@ -831,7 +831,7 @@
-
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/scsi/libfc/fc_exch.c linux-4.6.6/drivers/scsi/libfc/fc_exch.c
---- linux-4.6.6.orig/drivers/scsi/libfc/fc_exch.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/scsi/libfc/fc_exch.c 2016-08-22 21:27:47.245882341 +0200
-@@ -814,10 +814,10 @@
- }
- 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 -Nur linux-4.6.6.orig/drivers/scsi/libsas/sas_ata.c linux-4.6.6/drivers/scsi/libsas/sas_ata.c
---- linux-4.6.6.orig/drivers/scsi/libsas/sas_ata.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/scsi/libsas/sas_ata.c 2016-08-22 21:27:47.253882854 +0200
-@@ -190,7 +190,7 @@
- /* 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 @@
-
- out:
- spin_lock(ap->lock);
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- return ret;
- }
-
-diff -Nur linux-4.6.6.orig/drivers/scsi/qla2xxx/qla_inline.h linux-4.6.6/drivers/scsi/qla2xxx/qla_inline.h
---- linux-4.6.6.orig/drivers/scsi/qla2xxx/qla_inline.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/scsi/qla2xxx/qla_inline.h 2016-08-22 21:27:47.261883367 +0200
-@@ -59,12 +59,12 @@
- {
- 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 -Nur linux-4.6.6.orig/drivers/thermal/x86_pkg_temp_thermal.c linux-4.6.6/drivers/thermal/x86_pkg_temp_thermal.c
---- linux-4.6.6.orig/drivers/thermal/x86_pkg_temp_thermal.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/thermal/x86_pkg_temp_thermal.c 2016-08-22 21:27:47.273884133 +0200
-@@ -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 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 @@
- 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 @@
- 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(&notify_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(&notify_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 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/tty/metag_da.c linux-4.6.6/drivers/tty/metag_da.c
---- linux-4.6.6.orig/drivers/tty/metag_da.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/tty/metag_da.c 2016-08-22 21:27:47.273884133 +0200
-@@ -323,12 +323,12 @@
- 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 -Nur linux-4.6.6.orig/drivers/tty/mips_ejtag_fdc.c linux-4.6.6/drivers/tty/mips_ejtag_fdc.c
---- linux-4.6.6.orig/drivers/tty/mips_ejtag_fdc.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/tty/mips_ejtag_fdc.c 2016-08-22 21:27:47.273884133 +0200
-@@ -689,7 +689,7 @@
-
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/tty/serial/8250/8250_core.c linux-4.6.6/drivers/tty/serial/8250/8250_core.c
---- linux-4.6.6.orig/drivers/tty/serial/8250/8250_core.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/tty/serial/8250/8250_core.c 2016-08-22 21:27:47.273884133 +0200
-@@ -58,7 +58,16 @@
-
- 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 -Nur linux-4.6.6.orig/drivers/tty/serial/8250/8250_port.c linux-4.6.6/drivers/tty/serial/8250/8250_port.c
---- linux-4.6.6.orig/drivers/tty/serial/8250/8250_port.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/tty/serial/8250/8250_port.c 2016-08-22 21:27:47.277884393 +0200
-@@ -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 @@
-
- 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 -Nur linux-4.6.6.orig/drivers/tty/serial/amba-pl011.c linux-4.6.6/drivers/tty/serial/amba-pl011.c
---- linux-4.6.6.orig/drivers/tty/serial/amba-pl011.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/tty/serial/amba-pl011.c 2016-08-22 21:27:47.277884393 +0200
-@@ -2166,13 +2166,19 @@
-
- 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_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 -Nur linux-4.6.6.orig/drivers/tty/serial/omap-serial.c linux-4.6.6/drivers/tty/serial/omap-serial.c
---- linux-4.6.6.orig/drivers/tty/serial/omap-serial.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/tty/serial/omap-serial.c 2016-08-22 21:27:47.281884646 +0200
-@@ -1257,13 +1257,10 @@
-
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/tty/serial/sc16is7xx.c linux-4.6.6/drivers/tty/serial/sc16is7xx.c
---- linux-4.6.6.orig/drivers/tty/serial/sc16is7xx.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/tty/serial/sc16is7xx.c 2016-08-22 21:27:47.281884646 +0200
-@@ -1251,7 +1251,7 @@
-
- /* 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 -Nur linux-4.6.6.orig/drivers/usb/core/hcd.c linux-4.6.6/drivers/usb/core/hcd.c
---- linux-4.6.6.orig/drivers/usb/core/hcd.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/usb/core/hcd.c 2016-08-22 21:27:47.281884646 +0200
-@@ -1759,9 +1759,9 @@
- * 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 -Nur linux-4.6.6.orig/drivers/usb/gadget/function/f_fs.c linux-4.6.6/drivers/usb/gadget/function/f_fs.c
---- linux-4.6.6.orig/drivers/usb/gadget/function/f_fs.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/usb/gadget/function/f_fs.c 2016-08-22 21:27:47.285884906 +0200
-@@ -1393,7 +1393,7 @@
- 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 -Nur linux-4.6.6.orig/drivers/usb/gadget/legacy/inode.c linux-4.6.6/drivers/usb/gadget/legacy/inode.c
---- linux-4.6.6.orig/drivers/usb/gadget/legacy/inode.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/usb/gadget/legacy/inode.c 2016-08-22 21:27:47.285884906 +0200
-@@ -346,7 +346,7 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/drivers/usb/host/ohci-hcd.c linux-4.6.6/drivers/usb/host/ohci-hcd.c
---- linux-4.6.6.orig/drivers/usb/host/ohci-hcd.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/usb/host/ohci-hcd.c 2016-08-22 21:27:47.289885159 +0200
-@@ -500,7 +500,6 @@
-
- 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 -Nur linux-4.6.6.orig/drivers/usb/host/xhci.c linux-4.6.6/drivers/usb/host/xhci.c
---- linux-4.6.6.orig/drivers/usb/host/xhci.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/drivers/usb/host/xhci.c 2016-08-22 21:27:47.289885159 +0200
-@@ -490,8 +490,6 @@
- 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 -Nur linux-4.6.6.orig/fs/aio.c linux-4.6.6/fs/aio.c
---- linux-4.6.6.orig/fs/aio.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/fs/aio.c 2016-08-22 21:27:47.293885419 +0200
-@@ -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 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 @@
- .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 @@
- 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 @@
- 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 @@
- * 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 @@
- 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 -Nur linux-4.6.6.orig/fs/autofs4/autofs_i.h linux-4.6.6/fs/autofs4/autofs_i.h
---- linux-4.6.6.orig/fs/autofs4/autofs_i.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/fs/autofs4/autofs_i.h 2016-08-22 21:27:47.293885419 +0200
-@@ -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 -Nur linux-4.6.6.orig/fs/autofs4/expire.c linux-4.6.6/fs/autofs4/expire.c
---- linux-4.6.6.orig/fs/autofs4/expire.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/fs/autofs4/expire.c 2016-08-22 21:27:47.293885419 +0200
-@@ -148,7 +148,7 @@
- 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 -Nur linux-4.6.6.orig/fs/buffer.c linux-4.6.6/fs/buffer.c
---- linux-4.6.6.orig/fs/buffer.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/fs/buffer.c 2016-08-22 21:27:47.293885419 +0200
-@@ -300,8 +300,7 @@
- * 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 @@
- }
- 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 @@
- 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 @@
- }
-
- 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 @@
- }
- 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 *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 -Nur linux-4.6.6.orig/fs/dcache.c linux-4.6.6/fs/dcache.c
---- linux-4.6.6.orig/fs/dcache.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/fs/dcache.c 2016-08-22 21:27:47.297885672 +0200
-@@ -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 @@
-
- failed:
- spin_unlock(&dentry->d_lock);
-- cpu_relax();
-+ cpu_chill();
- return dentry; /* try again with same dentry */
- }
-
-@@ -2316,7 +2317,7 @@
- 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 -Nur linux-4.6.6.orig/fs/eventpoll.c linux-4.6.6/fs/eventpoll.c
---- linux-4.6.6.orig/fs/eventpoll.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/fs/eventpoll.c 2016-08-22 21:27:47.297885672 +0200
-@@ -510,12 +510,12 @@
- */
- 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 -Nur linux-4.6.6.orig/fs/exec.c linux-4.6.6/fs/exec.c
---- linux-4.6.6.orig/fs/exec.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/fs/exec.c 2016-08-22 21:27:47.301885933 +0200
-@@ -961,12 +961,14 @@
- }
- }
- 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 -Nur linux-4.6.6.orig/fs/jbd2/checkpoint.c linux-4.6.6/fs/jbd2/checkpoint.c
---- linux-4.6.6.orig/fs/jbd2/checkpoint.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/fs/jbd2/checkpoint.c 2016-08-22 21:27:47.301885933 +0200
-@@ -116,6 +116,8 @@
- 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 -Nur linux-4.6.6.orig/fs/namespace.c linux-4.6.6/fs/namespace.c
---- linux-4.6.6.orig/fs/namespace.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/fs/namespace.c 2016-08-22 21:27:47.301885933 +0200
-@@ -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 @@
- * 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 -Nur linux-4.6.6.orig/fs/ntfs/aops.c linux-4.6.6/fs/ntfs/aops.c
---- linux-4.6.6.orig/fs/ntfs/aops.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/fs/ntfs/aops.c 2016-08-22 21:27:47.305886186 +0200
-@@ -92,13 +92,13 @@
- 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 @@
- "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 @@
- }
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/fs/timerfd.c linux-4.6.6/fs/timerfd.c
---- linux-4.6.6.orig/fs/timerfd.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/fs/timerfd.c 2016-08-22 21:27:47.305886186 +0200
-@@ -450,7 +450,10 @@
- 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 -Nur linux-4.6.6.orig/include/acpi/platform/aclinux.h linux-4.6.6/include/acpi/platform/aclinux.h
---- linux-4.6.6.orig/include/acpi/platform/aclinux.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/acpi/platform/aclinux.h 2016-08-22 21:27:47.305886186 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/asm-generic/bug.h linux-4.6.6/include/asm-generic/bug.h
---- linux-4.6.6.orig/include/asm-generic/bug.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/asm-generic/bug.h 2016-08-22 21:27:47.305886186 +0200
-@@ -215,6 +215,20 @@
- # 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 -Nur linux-4.6.6.orig/include/asm-generic/preempt.h linux-4.6.6/include/asm-generic/preempt.h
---- linux-4.6.6.orig/include/asm-generic/preempt.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/asm-generic/preempt.h 2016-08-22 21:27:47.305886186 +0200
-@@ -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 &current_thread_info()->preempt_count;
- }
-diff -Nur linux-4.6.6.orig/include/linux/blkdev.h linux-4.6.6/include/linux/blkdev.h
---- linux-4.6.6.orig/include/linux/blkdev.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/blkdev.h 2016-08-22 21:27:47.309886446 +0200
-@@ -90,6 +90,7 @@
- struct list_head queuelist;
- union {
- struct call_single_data csd;
-+ struct work_struct work;
- unsigned long fifo_time;
- };
-
-@@ -457,7 +458,7 @@
- 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 -Nur linux-4.6.6.orig/include/linux/blk-mq.h linux-4.6.6/include/linux/blk-mq.h
---- linux-4.6.6.orig/include/linux/blk-mq.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/blk-mq.h 2016-08-22 21:27:47.305886186 +0200
-@@ -218,6 +218,7 @@
-
- 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 -Nur linux-4.6.6.orig/include/linux/bottom_half.h linux-4.6.6/include/linux/bottom_half.h
---- linux-4.6.6.orig/include/linux/bottom_half.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/bottom_half.h 2016-08-22 21:27:47.309886446 +0200
-@@ -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 @@
- {
- __local_bh_enable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET);
- }
-+#endif
-
- #endif /* _LINUX_BH_H */
-diff -Nur linux-4.6.6.orig/include/linux/buffer_head.h linux-4.6.6/include/linux/buffer_head.h
---- linux-4.6.6.orig/include/linux/buffer_head.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/buffer_head.h 2016-08-22 21:27:47.309886446 +0200
-@@ -75,8 +75,50 @@
- 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 -Nur linux-4.6.6.orig/include/linux/cgroup-defs.h linux-4.6.6/include/linux/cgroup-defs.h
---- linux-4.6.6.orig/include/linux/cgroup-defs.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/cgroup-defs.h 2016-08-22 21:27:47.309886446 +0200
-@@ -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 @@
- /* percpu_ref killing and RCU release */
- struct rcu_head rcu_head;
- struct work_struct destroy_work;
-+ struct swork_event destroy_swork;
- };
-
- /*
-diff -Nur linux-4.6.6.orig/include/linux/completion.h linux-4.6.6/include/linux/completion.h
---- linux-4.6.6.orig/include/linux/completion.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/completion.h 2016-08-22 21:27:47.309886446 +0200
-@@ -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 @@
- static inline void init_completion(struct completion *x)
- {
- x->done = 0;
-- init_waitqueue_head(&x->wait);
-+ init_swait_queue_head(&x->wait);
- }
-
- /**
-diff -Nur linux-4.6.6.orig/include/linux/cpu.h linux-4.6.6/include/linux/cpu.h
---- linux-4.6.6.orig/include/linux/cpu.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/cpu.h 2016-08-22 21:27:47.309886446 +0200
-@@ -230,6 +230,8 @@
- 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 @@
- #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 -Nur linux-4.6.6.orig/include/linux/delay.h linux-4.6.6/include/linux/delay.h
---- linux-4.6.6.orig/include/linux/delay.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/delay.h 2016-08-22 21:27:47.309886446 +0200
-@@ -52,4 +52,10 @@
- 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 -Nur linux-4.6.6.orig/include/linux/highmem.h linux-4.6.6/include/linux/highmem.h
---- linux-4.6.6.orig/include/linux/highmem.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/highmem.h 2016-08-22 21:27:47.309886446 +0200
-@@ -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 *kmap_atomic(struct page *page)
- {
-- preempt_disable();
-+ preempt_disable_nort();
- pagefault_disable();
- return page_address(page);
- }
-@@ -74,7 +75,7 @@
- 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 @@
-
- #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 -Nur linux-4.6.6.orig/include/linux/hrtimer.h linux-4.6.6/include/linux/hrtimer.h
---- linux-4.6.6.orig/include/linux/hrtimer.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/hrtimer.h 2016-08-22 21:27:47.313886699 +0200
-@@ -87,6 +87,9 @@
- * @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 @@
- 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 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 @@
- * 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- * 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 -Nur linux-4.6.6.orig/include/linux/idr.h linux-4.6.6/include/linux/idr.h
---- linux-4.6.6.orig/include/linux/idr.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/idr.h 2016-08-22 21:27:47.313886699 +0200
-@@ -95,10 +95,14 @@
- * 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 -Nur linux-4.6.6.orig/include/linux/init_task.h linux-4.6.6/include/linux/init_task.h
---- linux-4.6.6.orig/include/linux/init_task.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/init_task.h 2016-08-22 21:27:47.313886699 +0200
-@@ -148,6 +148,12 @@
- # 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 @@
- .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 -Nur linux-4.6.6.orig/include/linux/interrupt.h linux-4.6.6/include/linux/interrupt.h
---- linux-4.6.6.orig/include/linux/interrupt.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/interrupt.h 2016-08-22 21:27:47.313886699 +0200
-@@ -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 @@
- #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 @@
- * @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 @@
- 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 @@
- 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 @@
- 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 @@
- __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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/include/linux/irqdesc.h linux-4.6.6/include/linux/irqdesc.h
---- linux-4.6.6.orig/include/linux/irqdesc.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/irqdesc.h 2016-08-22 21:27:47.313886699 +0200
-@@ -64,6 +64,7 @@
- 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 -Nur linux-4.6.6.orig/include/linux/irqflags.h linux-4.6.6/include/linux/irqflags.h
---- linux-4.6.6.orig/include/linux/irqflags.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/irqflags.h 2016-08-22 21:27:47.317886959 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/linux/irq.h linux-4.6.6/include/linux/irq.h
---- linux-4.6.6.orig/include/linux/irq.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/irq.h 2016-08-22 21:27:47.313886699 +0200
-@@ -72,6 +72,7 @@
- * 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 @@
- 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 -Nur linux-4.6.6.orig/include/linux/irq_work.h linux-4.6.6/include/linux/irq_work.h
---- linux-4.6.6.orig/include/linux/irq_work.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/irq_work.h 2016-08-22 21:27:47.313886699 +0200
-@@ -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 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 -Nur linux-4.6.6.orig/include/linux/jbd2.h linux-4.6.6/include/linux/jbd2.h
---- linux-4.6.6.orig/include/linux/jbd2.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/jbd2.h 2016-08-22 21:27:47.317886959 +0200
-@@ -347,32 +347,56 @@
-
- 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 -Nur linux-4.6.6.orig/include/linux/kdb.h linux-4.6.6/include/linux/kdb.h
---- linux-4.6.6.orig/include/linux/kdb.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/kdb.h 2016-08-22 21:27:47.317886959 +0200
-@@ -167,6 +167,7 @@
- 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_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 -Nur linux-4.6.6.orig/include/linux/kernel.h linux-4.6.6/include/linux/kernel.h
---- linux-4.6.6.orig/include/linux/kernel.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/kernel.h 2016-08-22 21:27:47.317886959 +0200
-@@ -188,6 +188,9 @@
- */
- # 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 @@
- 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 @@
- SYSTEM_HALT,
- SYSTEM_POWER_OFF,
- SYSTEM_RESTART,
-+ SYSTEM_SUSPEND,
- } system_state;
-
- #define TAINT_PROPRIETARY_MODULE 0
-diff -Nur linux-4.6.6.orig/include/linux/lglock.h linux-4.6.6/include/linux/lglock.h
---- linux-4.6.6.orig/include/linux/lglock.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/lglock.h 2016-08-22 21:27:47.317886959 +0200
-@@ -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 @@
- 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_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 -Nur linux-4.6.6.orig/include/linux/list_bl.h linux-4.6.6/include/linux/list_bl.h
---- linux-4.6.6.orig/include/linux/list_bl.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/list_bl.h 2016-08-22 21:27:47.321887212 +0200
-@@ -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_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 -Nur linux-4.6.6.orig/include/linux/list.h linux-4.6.6/include/linux/list.h
---- linux-4.6.6.orig/include/linux/list.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/list.h 2016-08-22 21:27:47.317886959 +0200
-@@ -679,6 +679,16 @@
- }
-
- /*
-+ * 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 -Nur linux-4.6.6.orig/include/linux/locallock.h linux-4.6.6/include/linux/locallock.h
---- linux-4.6.6.orig/include/linux/locallock.h 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/include/linux/locallock.h 2016-08-22 21:27:47.321887212 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/linux/mm_types.h linux-4.6.6/include/linux/mm_types.h
---- linux-4.6.6.orig/include/linux/mm_types.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/mm_types.h 2016-08-22 21:27:47.321887212 +0200
-@@ -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 @@
- 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 -Nur linux-4.6.6.orig/include/linux/mutex.h linux-4.6.6/include/linux/mutex.h
---- linux-4.6.6.orig/include/linux/mutex.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/mutex.h 2016-08-22 21:27:47.321887212 +0200
-@@ -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 @@
- 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 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 -Nur linux-4.6.6.orig/include/linux/mutex_rt.h linux-4.6.6/include/linux/mutex_rt.h
---- linux-4.6.6.orig/include/linux/mutex_rt.h 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/include/linux/mutex_rt.h 2016-08-22 21:27:47.321887212 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/linux/netdevice.h linux-4.6.6/include/linux/netdevice.h
---- linux-4.6.6.orig/include/linux/netdevice.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/netdevice.h 2016-08-22 21:27:47.325887472 +0200
-@@ -2396,11 +2396,20 @@
- 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 @@
- unsigned int dropped;
- struct sk_buff_head input_pkt_queue;
- struct napi_struct backlog;
-+ struct sk_buff_head tofree_queue;
-
- };
-
-diff -Nur linux-4.6.6.orig/include/linux/netfilter/x_tables.h linux-4.6.6/include/linux/netfilter/x_tables.h
---- linux-4.6.6.orig/include/linux/netfilter/x_tables.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/netfilter/x_tables.h 2016-08-22 21:27:47.325887472 +0200
-@@ -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 @@
- */
- 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 @@
- {
- 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 @@
- /* 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 -Nur linux-4.6.6.orig/include/linux/notifier.h linux-4.6.6/include/linux/notifier.h
---- linux-4.6.6.orig/include/linux/notifier.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/notifier.h 2016-08-22 21:27:47.325887472 +0200
-@@ -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 @@
- (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 @@
- .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 @@
- 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 @@
-
- /*
- * 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 -Nur linux-4.6.6.orig/include/linux/percpu.h linux-4.6.6/include/linux/percpu.h
---- linux-4.6.6.orig/include/linux/percpu.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/percpu.h 2016-08-22 21:27:47.325887472 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/linux/pid.h linux-4.6.6/include/linux/pid.h
---- linux-4.6.6.orig/include/linux/pid.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/pid.h 2016-08-22 21:27:47.325887472 +0200
-@@ -2,6 +2,7 @@
- #define _LINUX_PID_H
-
- #include <linux/rcupdate.h>
-+#include <linux/atomic.h>
-
- enum pid_type
- {
-diff -Nur linux-4.6.6.orig/include/linux/preempt.h linux-4.6.6/include/linux/preempt.h
---- linux-4.6.6.orig/include/linux/preempt.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/preempt.h 2016-08-22 21:27:47.325887472 +0200
-@@ -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 @@
- #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 @@
- 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 @@
- __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 @@
- #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 @@
- } 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 -Nur linux-4.6.6.orig/include/linux/printk.h linux-4.6.6/include/linux/printk.h
---- linux-4.6.6.orig/include/linux/printk.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/printk.h 2016-08-22 21:27:47.329887725 +0200
-@@ -117,9 +117,11 @@
- #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 -Nur linux-4.6.6.orig/include/linux/radix-tree.h linux-4.6.6/include/linux/radix-tree.h
---- linux-4.6.6.orig/include/linux/radix-tree.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/radix-tree.h 2016-08-22 21:27:47.329887725 +0200
-@@ -294,8 +294,13 @@
- 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 @@
-
- static inline void radix_tree_preload_end(void)
- {
-- preempt_enable();
-+ preempt_enable_nort();
- }
-
- /**
-diff -Nur linux-4.6.6.orig/include/linux/random.h linux-4.6.6/include/linux/random.h
---- linux-4.6.6.orig/include/linux/random.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/random.h 2016-08-22 21:27:47.329887725 +0200
-@@ -20,7 +20,7 @@
- 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 -Nur linux-4.6.6.orig/include/linux/rbtree.h linux-4.6.6/include/linux/rbtree.h
---- linux-4.6.6.orig/include/linux/rbtree.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/rbtree.h 2016-08-22 21:27:47.329887725 +0200
-@@ -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 @@
- *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 -Nur linux-4.6.6.orig/include/linux/rcupdate.h linux-4.6.6/include/linux/rcupdate.h
---- linux-4.6.6.orig/include/linux/rcupdate.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/rcupdate.h 2016-08-22 21:27:47.329887725 +0200
-@@ -177,6 +177,9 @@
-
- #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_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 @@
- * 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 @@
- return 0;
- }
-
-+#define sched_rcu_preempt_depth() rcu_preempt_depth()
-+
- #endif /* #else #ifdef CONFIG_PREEMPT_RCU */
-
- /* Internal to kernel */
-@@ -498,7 +509,14 @@
- 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_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_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 -Nur linux-4.6.6.orig/include/linux/rcutree.h linux-4.6.6/include/linux/rcutree.h
---- linux-4.6.6.orig/include/linux/rcutree.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/rcutree.h 2016-08-22 21:27:47.329887725 +0200
-@@ -44,7 +44,11 @@
- 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 @@
- }
-
- 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_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 @@
-
- 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 -Nur linux-4.6.6.orig/include/linux/rtmutex.h linux-4.6.6/include/linux/rtmutex.h
---- linux-4.6.6.orig/include/linux/rtmutex.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/rtmutex.h 2016-08-22 21:27:47.329887725 +0200
-@@ -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 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 @@
- # 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_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 -Nur linux-4.6.6.orig/include/linux/rwlock_rt.h linux-4.6.6/include/linux/rwlock_rt.h
---- linux-4.6.6.orig/include/linux/rwlock_rt.h 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/include/linux/rwlock_rt.h 2016-08-22 21:27:47.329887725 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/linux/rwlock_types.h linux-4.6.6/include/linux/rwlock_types.h
---- linux-4.6.6.orig/include/linux/rwlock_types.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/rwlock_types.h 2016-08-22 21:27:47.329887725 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/linux/rwlock_types_rt.h linux-4.6.6/include/linux/rwlock_types_rt.h
---- linux-4.6.6.orig/include/linux/rwlock_types_rt.h 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/include/linux/rwlock_types_rt.h 2016-08-22 21:27:47.333887985 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/linux/rwsem.h linux-4.6.6/include/linux/rwsem.h
---- linux-4.6.6.orig/include/linux/rwsem.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/rwsem.h 2016-08-22 21:27:47.333887985 +0200
-@@ -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 @@
- # define up_read_non_owner(sem) up_read(sem)
- #endif
-
-+#endif /* !PREEMPT_RT_FULL */
-+
- #endif /* _LINUX_RWSEM_H */
-diff -Nur linux-4.6.6.orig/include/linux/rwsem_rt.h linux-4.6.6/include/linux/rwsem_rt.h
---- linux-4.6.6.orig/include/linux/rwsem_rt.h 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/include/linux/rwsem_rt.h 2016-08-22 21:27:47.333887985 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/linux/sched.h linux-4.6.6/include/linux/sched.h
---- linux-4.6.6.orig/include/linux/sched.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/sched.h 2016-08-22 21:27:47.333887985 +0200
-@@ -26,6 +26,7 @@
- #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 @@
- 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 @@
-
- #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 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 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 @@
- #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_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 @@
- /* 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 @@
- /* 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 @@
- 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 @@
- # 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 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 @@
- 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 @@
- /*
- * 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 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 @@
- 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 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 @@
-
- /* 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 @@
- 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 @@
- 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 @@
- __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 @@
-
- #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 -Nur linux-4.6.6.orig/include/linux/seqlock.h linux-4.6.6/include/linux/seqlock.h
---- linux-4.6.6.orig/include/linux/seqlock.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/seqlock.h 2016-08-22 21:27:47.337888238 +0200
-@@ -220,20 +220,30 @@
- 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 @@
- /*
- * 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 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 @@
- 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 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 -Nur linux-4.6.6.orig/include/linux/signal.h linux-4.6.6/include/linux/signal.h
---- linux-4.6.6.orig/include/linux/signal.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/signal.h 2016-08-22 21:27:47.337888238 +0200
-@@ -233,6 +233,7 @@
- }
-
- 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 -Nur linux-4.6.6.orig/include/linux/skbuff.h linux-4.6.6/include/linux/skbuff.h
---- linux-4.6.6.orig/include/linux/skbuff.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/skbuff.h 2016-08-22 21:27:47.337888238 +0200
-@@ -283,6 +283,7 @@
-
- __u32 qlen;
- spinlock_t lock;
-+ raw_spinlock_t raw_lock;
- };
-
- struct sk_buff;
-@@ -1538,6 +1539,12 @@
- __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 -Nur linux-4.6.6.orig/include/linux/smp.h linux-4.6.6/include/linux/smp.h
---- linux-4.6.6.orig/include/linux/smp.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/smp.h 2016-08-22 21:27:47.341888498 +0200
-@@ -185,6 +185,9 @@
- #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 -Nur linux-4.6.6.orig/include/linux/spinlock_api_smp.h linux-4.6.6/include/linux/spinlock_api_smp.h
---- linux-4.6.6.orig/include/linux/spinlock_api_smp.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/spinlock_api_smp.h 2016-08-22 21:27:47.341888498 +0200
-@@ -189,6 +189,8 @@
- 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 -Nur linux-4.6.6.orig/include/linux/spinlock.h linux-4.6.6/include/linux/spinlock.h
---- linux-4.6.6.orig/include/linux/spinlock.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/spinlock.h 2016-08-22 21:27:47.341888498 +0200
-@@ -271,7 +271,11 @@
- #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 @@
- # 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 @@
- #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 -Nur linux-4.6.6.orig/include/linux/spinlock_rt.h linux-4.6.6/include/linux/spinlock_rt.h
---- linux-4.6.6.orig/include/linux/spinlock_rt.h 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/include/linux/spinlock_rt.h 2016-08-22 21:27:47.341888498 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/linux/spinlock_types.h linux-4.6.6/include/linux/spinlock_types.h
---- linux-4.6.6.orig/include/linux/spinlock_types.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/spinlock_types.h 2016-08-22 21:27:47.341888498 +0200
-@@ -9,80 +9,15 @@
- * Released under the General Public License (GPL).
- */
-
--#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
-+#include <linux/spinlock_types_raw.h>
-
--#ifdef CONFIG_DEBUG_SPINLOCK
--# define SPIN_DEBUG_INIT(lockname) \
-- .magic = SPINLOCK_MAGIC, \
-- .owner_cpu = -1, \
-- .owner = SPINLOCK_OWNER_INIT,
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+# include <linux/spinlock_types_nort.h>
-+# include <linux/rwlock_types.h>
- #else
--# define SPIN_DEBUG_INIT(lockname)
-+# include <linux/rtmutex.h>
-+# include <linux/spinlock_types_rt.h>
-+# include <linux/rwlock_types_rt.h>
- #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 -Nur linux-4.6.6.orig/include/linux/spinlock_types_nort.h linux-4.6.6/include/linux/spinlock_types_nort.h
---- linux-4.6.6.orig/include/linux/spinlock_types_nort.h 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/include/linux/spinlock_types_nort.h 2016-08-22 21:27:47.341888498 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/linux/spinlock_types_raw.h linux-4.6.6/include/linux/spinlock_types_raw.h
---- linux-4.6.6.orig/include/linux/spinlock_types_raw.h 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/include/linux/spinlock_types_raw.h 2016-08-22 21:27:47.341888498 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/linux/spinlock_types_rt.h linux-4.6.6/include/linux/spinlock_types_rt.h
---- linux-4.6.6.orig/include/linux/spinlock_types_rt.h 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/include/linux/spinlock_types_rt.h 2016-08-22 21:27:47.341888498 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/linux/srcu.h linux-4.6.6/include/linux/srcu.h
---- linux-4.6.6.orig/include/linux/srcu.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/srcu.h 2016-08-22 21:27:47.341888498 +0200
-@@ -84,10 +84,10 @@
-
- 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 @@
- */
- #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 -Nur linux-4.6.6.orig/include/linux/suspend.h linux-4.6.6/include/linux/suspend.h
---- linux-4.6.6.orig/include/linux/suspend.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/suspend.h 2016-08-22 21:27:47.345888751 +0200
-@@ -194,6 +194,12 @@
- 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 -Nur linux-4.6.6.orig/include/linux/swait.h linux-4.6.6/include/linux/swait.h
---- linux-4.6.6.orig/include/linux/swait.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/swait.h 2016-08-22 21:27:47.345888751 +0200
-@@ -87,6 +87,7 @@
- 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 -Nur linux-4.6.6.orig/include/linux/swap.h linux-4.6.6/include/linux/swap.h
---- linux-4.6.6.orig/include/linux/swap.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/swap.h 2016-08-22 21:27:47.345888751 +0200
-@@ -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 @@
- 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 @@
-
-
- /* 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 -Nur linux-4.6.6.orig/include/linux/swork.h linux-4.6.6/include/linux/swork.h
---- linux-4.6.6.orig/include/linux/swork.h 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/include/linux/swork.h 2016-08-22 21:27:47.345888751 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/linux/thread_info.h linux-4.6.6/include/linux/thread_info.h
---- linux-4.6.6.orig/include/linux/thread_info.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/thread_info.h 2016-08-22 21:27:47.345888751 +0200
-@@ -103,7 +103,17 @@
- #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 -Nur linux-4.6.6.orig/include/linux/timer.h linux-4.6.6/include/linux/timer.h
---- linux-4.6.6.orig/include/linux/timer.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/timer.h 2016-08-22 21:27:47.345888751 +0200
-@@ -19,7 +19,6 @@
- void (*function)(unsigned long);
- unsigned long data;
- u32 flags;
-- int slack;
-
- #ifdef CONFIG_TIMER_STATS
- int start_pid;
-@@ -58,11 +57,14 @@
- * 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 @@
- .expires = (_expires), \
- .data = (_data), \
- .flags = (_flags), \
-- .slack = -1, \
- __TIMER_LOCKDEP_MAP_INITIALIZER( \
- __FILE__ ":" __stringify(__LINE__)) \
- }
-@@ -78,9 +79,15 @@
- #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 @@
-
- #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 @@
-
- #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 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 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 -Nur linux-4.6.6.orig/include/linux/trace_events.h linux-4.6.6/include/linux/trace_events.h
---- linux-4.6.6.orig/include/linux/trace_events.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/trace_events.h 2016-08-22 21:27:47.345888751 +0200
-@@ -56,6 +56,9 @@
- 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 -Nur linux-4.6.6.orig/include/linux/uaccess.h linux-4.6.6/include/linux/uaccess.h
---- linux-4.6.6.orig/include/linux/uaccess.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/uaccess.h 2016-08-22 21:27:47.345888751 +0200
-@@ -24,6 +24,7 @@
- */
- 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 @@
- */
- barrier();
- pagefault_disabled_dec();
-+ migrate_enable();
- }
-
- /*
-diff -Nur linux-4.6.6.orig/include/linux/uprobes.h linux-4.6.6/include/linux/uprobes.h
---- linux-4.6.6.orig/include/linux/uprobes.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/uprobes.h 2016-08-22 21:27:47.345888751 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/linux/vmstat.h linux-4.6.6/include/linux/vmstat.h
---- linux-4.6.6.orig/include/linux/vmstat.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/vmstat.h 2016-08-22 21:27:47.345888751 +0200
-@@ -33,7 +33,9 @@
- */
- 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_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 -Nur linux-4.6.6.orig/include/linux/wait.h linux-4.6.6/include/linux/wait.h
---- linux-4.6.6.orig/include/linux/wait.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/linux/wait.h 2016-08-22 21:27:47.349889011 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/net/dst.h linux-4.6.6/include/net/dst.h
---- linux-4.6.6.orig/include/net/dst.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/net/dst.h 2016-08-22 21:27:47.349889011 +0200
-@@ -449,7 +449,7 @@
- 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 -Nur linux-4.6.6.orig/include/net/neighbour.h linux-4.6.6/include/net/neighbour.h
---- linux-4.6.6.orig/include/net/neighbour.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/net/neighbour.h 2016-08-22 21:27:47.349889011 +0200
-@@ -446,7 +446,7 @@
- }
- #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 @@
-
- #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 -Nur linux-4.6.6.orig/include/net/netns/ipv4.h linux-4.6.6/include/net/netns/ipv4.h
---- linux-4.6.6.orig/include/net/netns/ipv4.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/include/net/netns/ipv4.h 2016-08-22 21:27:47.349889011 +0200
-@@ -70,6 +70,7 @@
-
- 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 -Nur linux-4.6.6.orig/include/trace/events/hist.h linux-4.6.6/include/trace/events/hist.h
---- linux-4.6.6.orig/include/trace/events/hist.h 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/include/trace/events/hist.h 2016-08-22 21:27:47.349889011 +0200
-@@ -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 -Nur linux-4.6.6.orig/include/trace/events/latency_hist.h linux-4.6.6/include/trace/events/latency_hist.h
---- linux-4.6.6.orig/include/trace/events/latency_hist.h 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/include/trace/events/latency_hist.h 2016-08-22 21:27:47.349889011 +0200
-@@ -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 -Nur linux-4.6.6.orig/init/Kconfig linux-4.6.6/init/Kconfig
---- linux-4.6.6.orig/init/Kconfig 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/init/Kconfig 2016-08-22 21:27:47.353889264 +0200
-@@ -494,7 +494,7 @@
-
- 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_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 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 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
-@@ -1718,6 +1719,7 @@
-
- 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
-@@ -1736,6 +1738,7 @@
- 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
-@@ -1745,7 +1748,7 @@
-
- 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 -Nur linux-4.6.6.orig/init/main.c linux-4.6.6/init/main.c
---- linux-4.6.6.orig/init/main.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/init/main.c 2016-08-22 21:27:47.353889264 +0200
-@@ -507,6 +507,7 @@
- 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 -Nur linux-4.6.6.orig/init/Makefile linux-4.6.6/init/Makefile
---- linux-4.6.6.orig/init/Makefile 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/init/Makefile 2016-08-22 21:27:47.353889264 +0200
-@@ -33,4 +33,4 @@
- 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 -Nur linux-4.6.6.orig/ipc/msg.c linux-4.6.6/ipc/msg.c
---- linux-4.6.6.orig/ipc/msg.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/ipc/msg.c 2016-08-22 21:27:47.353889264 +0200
-@@ -183,20 +183,14 @@
- }
- }
-
--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 @@
- {
- 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 @@
- 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 @@
- /* 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 @@
-
- out_unlock0:
- ipc_unlock_object(&msq->q_perm);
-+ wake_up_q(&wake_q);
- out_unlock1:
- rcu_read_unlock();
- out_up:
-@@ -566,7 +564,8 @@
- 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 @@
-
- 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 @@
- struct msg_msg *msg;
- int err;
- struct ipc_namespace *ns;
-+ WAKE_Q(wake_q);
-
- ns = current->nsproxy->ipc_ns;
-
-@@ -698,7 +684,7 @@
- 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 @@
-
- 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 @@
- 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 -Nur linux-4.6.6.orig/ipc/sem.c linux-4.6.6/ipc/sem.c
---- linux-4.6.6.orig/ipc/sem.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/ipc/sem.c 2016-08-22 21:27:47.357889524 +0200
-@@ -697,6 +697,13 @@
- 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 @@
- q->pid = error;
-
- list_add_tail(&q->list, pt);
-+#endif
- }
-
- /**
-@@ -721,6 +729,7 @@
- */
- 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 @@
- }
- if (did_something)
- preempt_enable();
-+#endif
- }
-
- static void unlink_queue(struct sem_array *sma, struct sem_queue *q)
-diff -Nur linux-4.6.6.orig/kernel/cgroup.c linux-4.6.6/kernel/cgroup.c
---- linux-4.6.6.orig/kernel/cgroup.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/cgroup.c 2016-08-22 21:27:47.361889777 +0200
-@@ -5011,10 +5011,10 @@
- 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;
-
-@@ -5055,8 +5055,8 @@
- 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,
-@@ -5698,6 +5698,7 @@
- */
- 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 -Nur linux-4.6.6.orig/kernel/cpu.c linux-4.6.6/kernel/cpu.c
---- linux-4.6.6.orig/kernel/cpu.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/cpu.c 2016-08-22 21:27:47.361889777 +0200
-@@ -152,8 +152,8 @@
- #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 @@
- #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 @@
- 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 @@
- 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 @@
- 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 @@
-
- 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 -Nur linux-4.6.6.orig/kernel/debug/kdb/kdb_io.c linux-4.6.6/kernel/debug/kdb/kdb_io.c
---- linux-4.6.6.orig/kernel/debug/kdb/kdb_io.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/debug/kdb/kdb_io.c 2016-08-22 21:27:47.365890038 +0200
-@@ -554,7 +554,6 @@
- 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 @@
- 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 @@
- } else {
- __release(kdb_printf_lock);
- }
-- kdb_trap_printk = saved_trap_printk;
- preempt_enable();
- return retlen;
- }
-@@ -865,9 +861,11 @@
- 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 -Nur linux-4.6.6.orig/kernel/events/core.c linux-4.6.6/kernel/events/core.c
---- linux-4.6.6.orig/kernel/events/core.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/events/core.c 2016-08-22 21:27:47.369890291 +0200
-@@ -963,6 +963,7 @@
- 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 @@
-
- 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 -Nur linux-4.6.6.orig/kernel/exit.c linux-4.6.6/kernel/exit.c
---- linux-4.6.6.orig/kernel/exit.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/exit.c 2016-08-22 21:27:47.369890291 +0200
-@@ -143,7 +143,7 @@
- * 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 -Nur linux-4.6.6.orig/kernel/fork.c linux-4.6.6/kernel/fork.c
---- linux-4.6.6.orig/kernel/fork.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/fork.c 2016-08-22 21:27:47.373890551 +0200
-@@ -253,7 +253,9 @@
- 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 @@
- 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 @@
- }
- 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 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 @@
- 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 -Nur linux-4.6.6.orig/kernel/futex.c linux-4.6.6/kernel/futex.c
---- linux-4.6.6.orig/kernel/futex.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/futex.c 2016-08-22 21:27:47.373890551 +0200
-@@ -874,7 +874,9 @@
- * 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 @@
- 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 @@
-
- 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 @@
- */
- 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 @@
- 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 @@
- 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 @@
- * 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 @@
- /* 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(&current->pi_lock);
-+ if (current->pi_blocked_on) {
-+ /*
-+ * We have been requeued or are in the process of
-+ * being requeued.
-+ */
-+ raw_spin_unlock_irq(&current->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(&current->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(&current->pi_lock);
-+ current->pi_blocked_on = NULL;
-+ raw_spin_unlock_irq(&current->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 @@
- * 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 @@
- 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 -Nur linux-4.6.6.orig/kernel/irq/handle.c linux-4.6.6/kernel/irq/handle.c
---- linux-4.6.6.orig/kernel/irq/handle.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/irq/handle.c 2016-08-22 21:27:47.373890551 +0200
-@@ -134,6 +134,8 @@
-
- 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 @@
- 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 -Nur linux-4.6.6.orig/kernel/irq/manage.c linux-4.6.6/kernel/irq/manage.c
---- linux-4.6.6.orig/kernel/irq/manage.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/irq/manage.c 2016-08-22 21:27:47.377890804 +0200
-@@ -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 @@
- return 0;
- }
- early_param("threadirqs", setup_forced_irqthreads);
-+# endif
- #endif
-
- static void __synchronize_hardirq(struct irq_desc *desc)
-@@ -179,6 +181,62 @@
- 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(&notify->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 @@
-
- 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 @@
- }
- 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 @@
- kref_put(&notify->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 @@
- notify->irq = irq;
- kref_init(&notify->kref);
- INIT_WORK(&notify->work, irq_affinity_notify);
-+ INIT_LIST_HEAD(&notify->list);
-+ init_helper_thread();
- }
-
- raw_spin_lock_irqsave(&desc->lock, flags);
-@@ -863,7 +938,15 @@
- 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 @@
- 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 @@
- 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 @@
- * 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 -Nur linux-4.6.6.orig/kernel/irq/settings.h linux-4.6.6/kernel/irq/settings.h
---- linux-4.6.6.orig/kernel/irq/settings.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/irq/settings.h 2016-08-22 21:27:47.377890804 +0200
-@@ -16,6 +16,7 @@
- _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 @@
- #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 @@
- 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 -Nur linux-4.6.6.orig/kernel/irq/spurious.c linux-4.6.6/kernel/irq/spurious.c
---- linux-4.6.6.orig/kernel/irq/spurious.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/irq/spurious.c 2016-08-22 21:27:47.377890804 +0200
-@@ -442,6 +442,10 @@
-
- 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 @@
-
- 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 -Nur linux-4.6.6.orig/kernel/irq_work.c linux-4.6.6/kernel/irq_work.c
---- linux-4.6.6.orig/kernel/irq_work.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/irq_work.c 2016-08-22 21:27:47.377890804 +0200
-@@ -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 @@
- */
- 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 @@
- 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 @@
- /* 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 @@
- /* 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 @@
- 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 @@
- 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 @@
- 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 @@
-
- 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 -Nur linux-4.6.6.orig/kernel/Kconfig.locks linux-4.6.6/kernel/Kconfig.locks
---- linux-4.6.6.orig/kernel/Kconfig.locks 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/Kconfig.locks 2016-08-22 21:27:47.357889524 +0200
-@@ -225,11 +225,11 @@
-
- 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 -Nur linux-4.6.6.orig/kernel/Kconfig.preempt linux-4.6.6/kernel/Kconfig.preempt
---- linux-4.6.6.orig/kernel/Kconfig.preempt 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/Kconfig.preempt 2016-08-22 21:27:47.357889524 +0200
-@@ -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 @@
-
- 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 @@
- 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 -Nur linux-4.6.6.orig/kernel/ksysfs.c linux-4.6.6/kernel/ksysfs.c
---- linux-4.6.6.orig/kernel/ksysfs.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/ksysfs.c 2016-08-22 21:27:47.377890804 +0200
-@@ -136,6 +136,15 @@
-
- #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 @@
- &rcu_expedited_attr.attr,
- &rcu_normal_attr.attr,
- #endif
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ &realtime_attr.attr,
-+#endif
- NULL
- };
-
-diff -Nur linux-4.6.6.orig/kernel/locking/lglock.c linux-4.6.6/kernel/locking/lglock.c
---- linux-4.6.6.orig/kernel/locking/lglock.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/locking/lglock.c 2016-08-22 21:27:47.377890804 +0200
-@@ -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 @@
- 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 @@
-
- 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 -Nur linux-4.6.6.orig/kernel/locking/lockdep.c linux-4.6.6/kernel/locking/lockdep.c
---- linux-4.6.6.orig/kernel/locking/lockdep.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/locking/lockdep.c 2016-08-22 21:27:47.381891064 +0200
-@@ -3648,6 +3648,7 @@
- }
- }
-
-+#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 @@
- DEBUG_LOCKS_WARN_ON(!current->softirqs_enabled);
- }
- }
-+#endif
-
- if (!debug_locks)
- print_irqtrace_events(current);
-diff -Nur linux-4.6.6.orig/kernel/locking/locktorture.c linux-4.6.6/kernel/locking/locktorture.c
---- linux-4.6.6.orig/kernel/locking/locktorture.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/locking/locktorture.c 2016-08-22 21:27:47.381891064 +0200
-@@ -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 -Nur linux-4.6.6.orig/kernel/locking/Makefile linux-4.6.6/kernel/locking/Makefile
---- linux-4.6.6.orig/kernel/locking/Makefile 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/locking/Makefile 2016-08-22 21:27:47.377890804 +0200
-@@ -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_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-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o
- obj-$(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 -Nur linux-4.6.6.orig/kernel/locking/rt.c linux-4.6.6/kernel/locking/rt.c
---- linux-4.6.6.orig/kernel/locking/rt.c 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/kernel/locking/rt.c 2016-08-22 21:27:47.385891317 +0200
-@@ -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 -Nur linux-4.6.6.orig/kernel/locking/rtmutex.c linux-4.6.6/kernel/locking/rtmutex.c
---- linux-4.6.6.orig/kernel/locking/rtmutex.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/locking/rtmutex.c 2016-08-22 21:27:47.385891317 +0200
-@@ -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 @@
- 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 @@
- 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 @@
-
- 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 @@
- * 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 @@
- * 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 @@
- 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 @@
- * @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 @@
- * 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 @@
- * 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 @@
- 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 @@
- 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 @@
- 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 @@
- * 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 @@
-
- raw_spin_unlock(&current->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 @@
- {
- 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(&current->pi_lock);
- rt_mutex_dequeue(lock, waiter);
-@@ -1038,7 +1494,8 @@
- __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 @@
- 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 @@
- 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 @@
- 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 __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 @@
-
- /* 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 @@
-
- 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 @@
- * 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 @@
- *
- * 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 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 @@
- 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 @@
- {
- 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 @@
- {
- 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 @@
- 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 @@
-
- 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 @@
- */
- 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 @@
- * 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
-
- 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 -Nur linux-4.6.6.orig/kernel/locking/rtmutex_common.h linux-4.6.6/kernel/locking/rtmutex_common.h
---- linux-4.6.6.orig/kernel/locking/rtmutex_common.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/locking/rtmutex_common.h 2016-08-22 21:27:47.385891317 +0200
-@@ -27,6 +27,7 @@
- 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 @@
- /*
- * 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 @@
- 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 @@
- # 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 -Nur linux-4.6.6.orig/kernel/locking/spinlock.c linux-4.6.6/kernel/locking/spinlock.c
---- linux-4.6.6.orig/kernel/locking/spinlock.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/locking/spinlock.c 2016-08-22 21:27:47.389891577 +0200
-@@ -124,8 +124,11 @@
- * __[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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/kernel/locking/spinlock_debug.c linux-4.6.6/kernel/locking/spinlock_debug.c
---- linux-4.6.6.orig/kernel/locking/spinlock_debug.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/locking/spinlock_debug.c 2016-08-22 21:27:47.389891577 +0200
-@@ -31,6 +31,7 @@
-
- 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 @@
- }
-
- EXPORT_SYMBOL(__rwlock_init);
-+#endif
-
- static void spin_dump(raw_spinlock_t *lock, const char *msg)
- {
-@@ -159,6 +161,7 @@
- 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 @@
- debug_write_unlock(lock);
- arch_write_unlock(&lock->raw_lock);
- }
-+
-+#endif
-diff -Nur linux-4.6.6.orig/kernel/panic.c linux-4.6.6/kernel/panic.c
---- linux-4.6.6.orig/kernel/panic.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/panic.c 2016-08-22 21:27:47.389891577 +0200
-@@ -444,9 +444,11 @@
-
- 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 -Nur linux-4.6.6.orig/kernel/power/hibernate.c linux-4.6.6/kernel/power/hibernate.c
---- linux-4.6.6.orig/kernel/power/hibernate.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/power/hibernate.c 2016-08-22 21:27:47.389891577 +0200
-@@ -285,6 +285,8 @@
-
- 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 @@
- syscore_resume();
-
- Enable_irqs:
-+ system_state = SYSTEM_RUNNING;
- local_irq_enable();
-
- Enable_cpus:
-@@ -438,6 +441,7 @@
- goto Enable_cpus;
-
- local_irq_disable();
-+ system_state = SYSTEM_SUSPEND;
-
- error = syscore_suspend();
- if (error)
-@@ -471,6 +475,7 @@
- syscore_resume();
-
- Enable_irqs:
-+ system_state = SYSTEM_RUNNING;
- local_irq_enable();
-
- Enable_cpus:
-@@ -556,6 +561,7 @@
- goto Enable_cpus;
-
- local_irq_disable();
-+ system_state = SYSTEM_SUSPEND;
- syscore_suspend();
- if (pm_wakeup_pending()) {
- error = -EAGAIN;
-@@ -568,6 +574,7 @@
-
- Power_up:
- syscore_resume();
-+ system_state = SYSTEM_RUNNING;
- local_irq_enable();
-
- Enable_cpus:
-@@ -642,6 +649,10 @@
- cpu_relax();
- }
-
-+#ifndef CONFIG_SUSPEND
-+bool pm_in_action;
-+#endif
-+
- /**
- * hibernate - Carry out system hibernation, including saving the image.
- */
-@@ -654,6 +665,8 @@
- 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 @@
- atomic_inc(&snapshot_device_available);
- Unlock:
- unlock_system_sleep();
-+ pm_in_action = false;
- return error;
- }
-
-diff -Nur linux-4.6.6.orig/kernel/power/suspend.c linux-4.6.6/kernel/power/suspend.c
---- linux-4.6.6.orig/kernel/power/suspend.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/power/suspend.c 2016-08-22 21:27:47.389891577 +0200
-@@ -359,6 +359,8 @@
- 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 @@
- syscore_resume();
- }
-
-+ system_state = SYSTEM_RUNNING;
-+
- arch_suspend_enable_irqs();
- BUG_ON(irqs_disabled());
-
-@@ -517,6 +521,8 @@
- 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 @@
- 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 @@
- } else {
- suspend_stats.success++;
- }
-+ pm_in_action = false;
- return error;
- }
- EXPORT_SYMBOL(pm_suspend);
-diff -Nur linux-4.6.6.orig/kernel/printk/printk.c linux-4.6.6/kernel/printk/printk.c
---- linux-4.6.6.orig/kernel/printk/printk.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/printk/printk.c 2016-08-22 21:27:47.393891830 +0200
-@@ -246,6 +246,65 @@
- */
- 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 @@
- {
- char *text;
- int len = 0;
-+ int attempts = 0;
-
- text = kmalloc(LOG_LINE_MAX + PREFIX_MAX, GFP_KERNEL);
- if (!text)
-@@ -1220,6 +1280,14 @@
- 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 @@
- 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 @@
- 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 @@
- clear_seq = log_next_seq;
- clear_idx = log_next_idx;
- }
-+out:
- raw_spin_unlock_irq(&logbuf_lock);
-
- kfree(text);
-@@ -1443,6 +1528,12 @@
- 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 @@
- else
- con->write(con, text, len);
- }
-+ migrate_enable();
- }
-
- /*
-@@ -1620,6 +1712,13 @@
- /* 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 @@
-
- /* 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 @@
-
- #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 @@
- 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 @@
- 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 @@
- {
- 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 -Nur linux-4.6.6.orig/kernel/ptrace.c linux-4.6.6/kernel/ptrace.c
---- linux-4.6.6.orig/kernel/ptrace.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/ptrace.c 2016-08-22 21:27:47.393891830 +0200
-@@ -128,7 +128,14 @@
-
- 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 -Nur linux-4.6.6.orig/kernel/rcu/rcutorture.c linux-4.6.6/kernel/rcu/rcutorture.c
---- linux-4.6.6.orig/kernel/rcu/rcutorture.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/rcu/rcutorture.c 2016-08-22 21:27:47.393891830 +0200
-@@ -409,6 +409,7 @@
- .name = "rcu"
- };
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- /*
- * Definitions for rcu_bh torture testing.
- */
-@@ -448,6 +449,12 @@
- .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 -Nur linux-4.6.6.orig/kernel/rcu/tree.c linux-4.6.6/kernel/rcu/tree.c
---- linux-4.6.6.orig/kernel/rcu/tree.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/rcu/tree.c 2016-08-22 21:27:47.397892090 +0200
-@@ -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 @@
- 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 @@
- __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 @@
- /*
- * 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 @@
- }
- 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 @@
- }
- 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 @@
- 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 @@
- /*
- * 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,
-@@ -2943,18 +2973,105 @@
- {
- if (unlikely(!READ_ONCE(rcu_scheduler_fully_active)))
- return;
-- if (likely(!rsp->boost)) {
-- rcu_do_batch(rsp, rdp);
-+ 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)
-+{
-+ 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;
-+ }
- }
-- invoke_rcu_callbacks_kthread();
-+ *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 void invoke_rcu_core(void)
-+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)
- {
-- if (cpu_online(smp_processor_id()))
-- raise_softirq(RCU_SOFTIRQ);
-+ 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 @@
- }
- 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 @@
- __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 @@
- }
- 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 @@
- 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 @@
- 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 @@
- _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 @@
-
- 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 -Nur linux-4.6.6.orig/kernel/rcu/tree.h linux-4.6.6/kernel/rcu/tree.h
---- linux-4.6.6.orig/kernel/rcu/tree.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/rcu/tree.h 2016-08-22 21:27:47.397892090 +0200
-@@ -572,18 +572,18 @@
- */
- 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 @@
- 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 -Nur linux-4.6.6.orig/kernel/rcu/tree_plugin.h linux-4.6.6/kernel/rcu/tree_plugin.h
---- linux-4.6.6.orig/kernel/rcu/tree_plugin.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/rcu/tree_plugin.h 2016-08-22 21:27:47.401892343 +0200
-@@ -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 @@
-
- #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 @@
- }
-
- /* 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 @@
- 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 @@
-
- #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 @@
-
- #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 @@
- }
-
- /*
-- * 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 @@
- 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 @@
- 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 @@
- 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 @@
-
- #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 @@
- 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 @@
- 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 @@
- *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 -Nur linux-4.6.6.orig/kernel/rcu/update.c linux-4.6.6/kernel/rcu/update.c
---- linux-4.6.6.orig/kernel/rcu/update.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/rcu/update.c 2016-08-22 21:27:47.401892343 +0200
-@@ -295,6 +295,7 @@
- }
- 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 @@
- return in_softirq() || irqs_disabled();
- }
- EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held);
-+#endif
-
- #endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
-
-diff -Nur linux-4.6.6.orig/kernel/relay.c linux-4.6.6/kernel/relay.c
---- linux-4.6.6.orig/kernel/relay.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/relay.c 2016-08-22 21:27:47.405892600 +0200
-@@ -336,6 +336,10 @@
- {
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/kernel/sched/completion.c linux-4.6.6/kernel/sched/completion.c
---- linux-4.6.6.orig/kernel/sched/completion.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/sched/completion.c 2016-08-22 21:27:47.405892600 +0200
-@@ -30,10 +30,10 @@
- {
- 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 @@
- {
- 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 @@
- 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 @@
- {
- 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 @@
- 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 @@
- * 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 -Nur linux-4.6.6.orig/kernel/sched/core.c linux-4.6.6/kernel/sched/core.c
---- linux-4.6.6.orig/kernel/sched/core.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/sched/core.c 2016-08-22 21:27:47.413893109 +0200
-@@ -128,7 +128,11 @@
- * 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 @@
-
- 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 @@
- 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 @@
- * 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 @@
- 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 @@
- */
- 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 @@
- cpu = housekeeping_any_cpu();
- unlock:
- rcu_read_unlock();
-+preempt_en_rt:
-+ preempt_enable_rt();
- return cpu;
- }
- /*
-@@ -1051,6 +1096,11 @@
-
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- * 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 @@
- 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 @@
- {
- 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 @@
- {
- 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 @@
- */
- 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_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 @@
- }
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- } 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 @@
-
- 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 @@
-
- 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 @@
- 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 @@
- __schedule(false);
- sched_preempt_enable_no_resched();
- } while (need_resched());
-+ sched_update_worker(tsk);
- }
- EXPORT_SYMBOL(schedule);
-
-@@ -3299,6 +3504,30 @@
- } 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 @@
- */
- if (likely(!preemptible()))
- return;
-+ if (!preemptible_lazy())
-+ return;
-
- preempt_schedule_common();
- }
-@@ -3339,6 +3570,8 @@
-
- if (likely(!preemptible()))
- return;
-+ if (!preemptible_lazy())
-+ return;
-
- do {
- preempt_disable_notrace();
-@@ -3348,7 +3581,16 @@
- * 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 @@
- }
- EXPORT_SYMBOL(__cond_resched_lock);
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- int __sched __cond_resched_softirq(void)
- {
- BUG_ON(!in_softirq());
-@@ -4706,6 +4949,7 @@
- return 0;
- }
- EXPORT_SYMBOL(__cond_resched_softirq);
-+#endif
-
- /**
- * yield - yield the current processor to other threads.
-@@ -5074,7 +5318,9 @@
-
- /* 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:
- */
-@@ -5215,6 +5461,8 @@
- #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.
-@@ -5229,7 +5477,11 @@
- 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;
- }
-
- /*
-@@ -5425,6 +5677,10 @@
-
- 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
- }
-@@ -7407,7 +7663,7 @@
- #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 -Nur linux-4.6.6.orig/kernel/sched/cpudeadline.c linux-4.6.6/kernel/sched/cpudeadline.c
---- linux-4.6.6.orig/kernel/sched/cpudeadline.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/sched/cpudeadline.c 2016-08-22 21:27:47.413893109 +0200
-@@ -103,10 +103,10 @@
- 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 -Nur linux-4.6.6.orig/kernel/sched/cpupri.c linux-4.6.6/kernel/sched/cpupri.c
---- linux-4.6.6.orig/kernel/sched/cpupri.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/sched/cpupri.c 2016-08-22 21:27:47.413893109 +0200
-@@ -103,11 +103,11 @@
- 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 -Nur linux-4.6.6.orig/kernel/sched/deadline.c linux-4.6.6/kernel/sched/deadline.c
---- linux-4.6.6.orig/kernel/sched/deadline.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/sched/deadline.c 2016-08-22 21:27:47.413893109 +0200
-@@ -134,7 +134,7 @@
- {
- 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 @@
- {
- 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 @@
-
- hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- timer->function = dl_task_timer;
-+ timer->irqsafe = 1;
- }
-
- static
-@@ -966,7 +967,7 @@
-
- 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 @@
- * 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 @@
- * 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 @@
- * 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 @@
- {
- 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 @@
- 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 @@
- 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 @@
-
- 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 @@
- */
- 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 @@
- {
- 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 @@
-
- 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 -Nur linux-4.6.6.orig/kernel/sched/debug.c linux-4.6.6/kernel/sched/debug.c
---- linux-4.6.6.orig/kernel/sched/debug.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/sched/debug.c 2016-08-22 21:27:47.413893109 +0200
-@@ -559,6 +559,9 @@
- 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 @@
- #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 -Nur linux-4.6.6.orig/kernel/sched/fair.c linux-4.6.6/kernel/sched/fair.c
---- linux-4.6.6.orig/kernel/sched/fair.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/sched/fair.c 2016-08-22 21:27:47.413893109 +0200
-@@ -3333,7 +3333,7 @@
- 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.
-@@ -3357,7 +3357,7 @@
- return;
-
- if (delta > ideal_runtime)
-- resched_curr(rq_of(cfs_rq));
-+ resched_curr_lazy(rq_of(cfs_rq));
- }
-
- static void
-@@ -3502,7 +3502,7 @@
- * validating it and just reschedule.
- */
- if (queued) {
-- resched_curr(rq_of(cfs_rq));
-+ resched_curr_lazy(rq_of(cfs_rq));
- return;
- }
- /*
-@@ -3684,7 +3684,7 @@
- * 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
-@@ -4296,7 +4296,7 @@
-
- if (delta < 0) {
- if (rq->curr == p)
-- resched_curr(rq);
-+ resched_curr_lazy(rq);
- return;
- }
- hrtick_start(rq, delta);
-@@ -5441,7 +5441,7 @@
- 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
-@@ -8192,7 +8192,7 @@
- * '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;
-@@ -8217,7 +8217,7 @@
- */
- if (rq->curr == p) {
- if (p->prio > oldprio)
-- resched_curr(rq);
-+ resched_curr_lazy(rq);
- } else
- check_preempt_curr(rq, p, 0);
- }
-diff -Nur linux-4.6.6.orig/kernel/sched/features.h linux-4.6.6/kernel/sched/features.h
---- linux-4.6.6.orig/kernel/sched/features.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/sched/features.h 2016-08-22 21:27:47.413893109 +0200
-@@ -45,11 +45,19 @@
- */
- 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 -Nur linux-4.6.6.orig/kernel/sched/Makefile linux-4.6.6/kernel/sched/Makefile
---- linux-4.6.6.orig/kernel/sched/Makefile 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/sched/Makefile 2016-08-22 21:27:47.405892600 +0200
-@@ -17,7 +17,7 @@
-
- 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 -Nur linux-4.6.6.orig/kernel/sched/rt.c linux-4.6.6/kernel/sched/rt.c
---- linux-4.6.6.orig/kernel/sched/rt.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/sched/rt.c 2016-08-22 21:27:47.417893368 +0200
-@@ -47,6 +47,7 @@
-
- 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 @@
- 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 @@
- 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 @@
- 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_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 @@
- * 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 @@
- * 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 @@
- * 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 @@
- * 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 @@
- 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 @@
-
- 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 @@
- {
- 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 @@
- */
- 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 -Nur linux-4.6.6.orig/kernel/sched/sched.h linux-4.6.6/kernel/sched/sched.h
---- linux-4.6.6.orig/kernel/sched/sched.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/sched/sched.h 2016-08-22 21:27:47.417893368 +0200
-@@ -1128,6 +1128,7 @@
- #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 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 -Nur linux-4.6.6.orig/kernel/sched/swait.c linux-4.6.6/kernel/sched/swait.c
---- linux-4.6.6.orig/kernel/sched/swait.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/sched/swait.c 2016-08-22 21:27:47.417893368 +0200
-@@ -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 @@
- }
- 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 -Nur linux-4.6.6.orig/kernel/sched/swork.c linux-4.6.6/kernel/sched/swork.c
---- linux-4.6.6.orig/kernel/sched/swork.c 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/kernel/sched/swork.c 2016-08-22 21:27:47.417893368 +0200
-@@ -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 -Nur linux-4.6.6.orig/kernel/signal.c linux-4.6.6/kernel/signal.c
---- linux-4.6.6.orig/kernel/signal.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/signal.c 2016-08-22 21:27:47.417893368 +0200
-@@ -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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- }
-
- /*
-+ * 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 @@
- 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 signr;
-
-+ WARN_ON_ONCE(tsk != current);
-+
- /* We only dequeue private signals from ourselves, we don't let
- * signalfd steal them
- */
-@@ -1156,8 +1216,8 @@
- * 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 @@
- 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 @@
- * 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 @@
- }
- spin_unlock(&sighand->siglock);
- rcu_read_unlock();
-- local_irq_restore(*flags);
-+ local_irq_restore_nort(*flags);
- }
-
- return sighand;
-@@ -1485,7 +1578,8 @@
- */
- 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 @@
- 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 @@
- * @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 @@
-
- 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 @@
- 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 @@
-
- if (sig)
- return sig;
-- return timeout ? -EINTR : -EAGAIN;
-+ return ret ? -EINTR : -EAGAIN;
- }
-
- /**
-diff -Nur linux-4.6.6.orig/kernel/softirq.c linux-4.6.6/kernel/softirq.c
---- linux-4.6.6.orig/kernel/softirq.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/softirq.c 2016-08-22 21:27:47.417893368 +0200
-@@ -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 @@
- 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 @@
- 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 @@
- 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 @@
- /* 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 @@
- }
-
- /*
-+ * 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, &param);
-+
-+ /* 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, &param);
-+}
-+
-+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 @@
- * 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 @@
-
- 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 @@
- } 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- {
- 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_enable();
-
-- 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 @@
-
- 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 @@
- open_softirq(HI_SOFTIRQ, tasklet_hi_action);
- }
-
--static int ksoftirqd_should_run(unsigned int cpu)
--{
-- return local_softirq_pending();
--}
--
--static void run_ksoftirqd(unsigned int cpu)
-+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
-+void tasklet_unlock_wait(struct tasklet_struct *t)
- {
-- local_irq_disable();
-- if (local_softirq_pending()) {
-+ while (test_bit(TASKLET_STATE_RUN, &(t)->state)) {
- /*
-- * We can safely run softirq on inline stack, as we are not deep
-- * in the task stack here.
-+ * Hack for now to avoid this busy-loop:
- */
-- __do_softirq();
-- local_irq_enable();
-- cond_resched_rcu_qs();
-- return;
-+#ifdef CONFIG_PREEMPT_RT_FULL
-+ msleep(1);
-+#else
-+ barrier();
-+#endif
- }
-- local_irq_enable();
-+}
-+EXPORT_SYMBOL(tasklet_unlock_wait);
-+#endif
-+
-+static int ksoftirqd_should_run(unsigned int cpu)
-+{
-+ return ksoftirqd_softirq_pending();
- }
-
- #ifdef CONFIG_HOTPLUG_CPU
-@@ -746,16 +1245,31 @@
-
- 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 -Nur linux-4.6.6.orig/kernel/stop_machine.c linux-4.6.6/kernel/stop_machine.c
---- linux-4.6.6.orig/kernel/stop_machine.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/stop_machine.c 2016-08-22 21:27:47.417893368 +0200
-@@ -36,7 +36,7 @@
- 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 @@
- 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 @@
- 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 @@
- __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 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 @@
- 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 @@
- 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 @@
-
- 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 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/kernel/time/hrtimer.c linux-4.6.6/kernel/time/hrtimer.c
---- linux-4.6.6.orig/kernel/time/hrtimer.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/time/hrtimer.c 2016-08-22 21:27:47.421893628 +0200
-@@ -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 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 @@
- {
- schedule_work(&hrtimer_work);
- }
-+#endif
-
- #else
-
-@@ -723,11 +764,8 @@
- 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 @@
- }
- 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 @@
- 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 @@
- 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 @@
-
- if (ret >= 0)
- return ret;
-- cpu_relax();
-+ hrtimer_wait_for_timer(timer);
- }
- }
- EXPORT_SYMBOL_GPL(hrtimer_cancel);
-@@ -1131,6 +1209,7 @@
-
- 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 @@
- 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 @@
- 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 @@
-
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
-
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- .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 -Nur linux-4.6.6.orig/kernel/time/itimer.c linux-4.6.6/kernel/time/itimer.c
---- linux-4.6.6.orig/kernel/time/itimer.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/time/itimer.c 2016-08-22 21:27:47.421893628 +0200
-@@ -213,6 +213,7 @@
- /* 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 -Nur linux-4.6.6.orig/kernel/time/jiffies.c linux-4.6.6/kernel/time/jiffies.c
---- linux-4.6.6.orig/kernel/time/jiffies.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/time/jiffies.c 2016-08-22 21:27:47.421893628 +0200
-@@ -74,7 +74,8 @@
- .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 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 -Nur linux-4.6.6.orig/kernel/time/ntp.c linux-4.6.6/kernel/time/ntp.c
---- linux-4.6.6.orig/kernel/time/ntp.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/time/ntp.c 2016-08-22 21:27:47.421893628 +0200
-@@ -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 @@
- &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 -Nur linux-4.6.6.orig/kernel/time/posix-cpu-timers.c linux-4.6.6/kernel/time/posix-cpu-timers.c
---- linux-4.6.6.orig/kernel/time/posix-cpu-timers.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/time/posix-cpu-timers.c 2016-08-22 21:27:47.421893628 +0200
-@@ -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 @@
- /*
- * 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;
-@@ -1064,7 +1065,7 @@
- /*
- * 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);
-
-@@ -1153,13 +1154,13 @@
- * 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
-@@ -1213,6 +1214,190 @@
- }
- }
-
-+#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, &param);
-+ 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 -Nur linux-4.6.6.orig/kernel/time/posix-timers.c linux-4.6.6/kernel/time/posix-timers.c
---- linux-4.6.6.orig/kernel/time/posix-timers.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/time/posix-timers.c 2016-08-22 21:27:47.421893628 +0200
-@@ -506,6 +506,7 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
-
- 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 @@
- 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(&current->sighand->siglock);
- list_del(&timer->list);
-@@ -980,8 +1005,18 @@
- retry_delete:
- spin_lock_irqsave(&timer->it_lock, flags);
-
-+ /* 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 -Nur linux-4.6.6.orig/kernel/time/tick-broadcast-hrtimer.c linux-4.6.6/kernel/time/tick-broadcast-hrtimer.c
---- linux-4.6.6.orig/kernel/time/tick-broadcast-hrtimer.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/time/tick-broadcast-hrtimer.c 2016-08-22 21:27:47.421893628 +0200
-@@ -106,5 +106,6 @@
- {
- hrtimer_init(&bctimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
- bctimer.function = bc_handler;
-+ bctimer.irqsafe = true;
- clockevents_register_device(&ce_broadcast_hrtimer);
- }
-diff -Nur linux-4.6.6.orig/kernel/time/tick-common.c linux-4.6.6/kernel/time/tick-common.c
---- linux-4.6.6.orig/kernel/time/tick-common.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/time/tick-common.c 2016-08-22 21:27:47.421893628 +0200
-@@ -79,13 +79,15 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/kernel/time/tick-internal.h linux-4.6.6/kernel/time/tick-internal.h
---- linux-4.6.6.orig/kernel/time/tick-internal.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/time/tick-internal.h 2016-08-22 21:27:47.421893628 +0200
-@@ -164,3 +164,4 @@
- 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 -Nur linux-4.6.6.orig/kernel/time/tick-sched.c linux-4.6.6/kernel/time/tick-sched.c
---- linux-4.6.6.orig/kernel/time/tick-sched.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/time/tick-sched.c 2016-08-22 21:27:47.421893628 +0200
-@@ -62,7 +62,8 @@
- 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 @@
- /* 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 @@
- {
- 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 DEFINE_PER_CPU(struct irq_work, nohz_full_kick_work) = {
- .func = nohz_full_kick_func,
-+ .flags = IRQ_WORK_HARD_IRQ,
- };
-
- /*
-@@ -670,10 +676,10 @@
-
- /* 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- * 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 -Nur linux-4.6.6.orig/kernel/time/timekeeping.c linux-4.6.6/kernel/time/timekeeping.c
---- linux-4.6.6.orig/kernel/time/timekeeping.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/time/timekeeping.c 2016-08-22 21:27:47.421893628 +0200
-@@ -2319,8 +2319,10 @@
- */
- 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 -Nur linux-4.6.6.orig/kernel/time/timekeeping.h linux-4.6.6/kernel/time/timekeeping.h
---- linux-4.6.6.orig/kernel/time/timekeeping.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/time/timekeeping.h 2016-08-22 21:27:47.425893881 +0200
-@@ -19,7 +19,8 @@
- 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 -Nur linux-4.6.6.orig/kernel/time/timer.c linux-4.6.6/kernel/time/timer.c
---- linux-4.6.6.orig/kernel/time/timer.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/time/timer.c 2016-08-22 21:27:47.425893881 +0200
-@@ -59,43 +59,156 @@
- 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)
-+ */
-+
-+/* 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))
-+
-+/*
-+ * The time start value for each level to select the bucket at enqueue
-+ * time.
- */
--#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))
-+#define LVL_START(n) ((LVL_SIZE - 1) << (((n) - 1) * LVL_CLK_SHIFT))
-
--struct tvec {
-- struct hlist_head vec[TVN_SIZE];
--};
-+/* 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
-
--struct tvec_root {
-- struct hlist_head vec[TVR_SIZE];
--};
-+/* 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))
-
--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;
--} ____cacheline_aligned;
-+/*
-+ * 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
-
--static DEFINE_PER_CPU(struct tvec_base, tvec_bases);
-+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 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 @@
- 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 @@
- 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 @@
- }
- 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;
- }
--EXPORT_SYMBOL_GPL(set_timer_slack);
-
--static void
--__internal_add_timer(struct tvec_base *base, struct timer_list *timer)
-+static inline void timer_set_idx(struct timer_list *timer, unsigned int idx)
- {
-- unsigned long expires = timer->expires;
-- unsigned long idx = expires - base->timer_jiffies;
-- struct hlist_head *vec;
-+ timer->flags = (timer->flags & ~TIMER_ARRAYMASK) |
-+ idx << TIMER_ARRAYSHIFT;
-+}
-
-- 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);
-+/*
-+ * 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 {
-- 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.
-+ /*
-+ * Force expire obscene large timeouts to expire at the
-+ * capacity limit of the wheel.
- */
-- 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;
-+ if (expires >= WHEEL_TIMEOUT_CUTOFF)
-+ expires = WHEEL_TIMEOUT_MAX;
-+
-+ idx = calc_index(expires, LVL_DEPTH - 1);
- }
-+ return idx;
-+}
-
-- hlist_add_head(&timer->entry, vec);
-+/*
-+ * 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);
- }
-
--static void internal_add_timer(struct tvec_base *base, struct timer_list *timer)
-+static void
-+__internal_add_timer(struct timer_base *base, struct timer_list *timer)
- {
-- /* Advance base->jiffies, if the base is empty */
-- if (!base->all_timers++)
-- base->timer_jiffies = jiffies;
-+ unsigned int idx;
-+
-+ idx = calc_wheel_index(timer->expires, base->clk);
-+ enqueue_timer(base, timer, idx);
-+}
-+
-+static void
-+trigger_dyntick_cpu(struct timer_base *base, struct timer_list *timer)
-+{
-+ if (!IS_ENABLED(CONFIG_NO_HZ_COMMON) || !base->nohz_active)
-+ return;
-
-- __internal_add_timer(base, timer);
- /*
-- * Update base->active_timers and base->next_timer
-+ * This wants some optimizing similar to the below, but we do that
-+ * when we switch from push to pull for deferrable timers.
- */
-- if (!(timer->flags & TIMER_DEFERRABLE)) {
-- if (!base->active_timers++ ||
-- time_before(timer->expires, base->next_timer))
-- base->next_timer = timer->expires;
-+ if (timer->flags & TIMER_DEFERRABLE) {
-+ if (tick_nohz_full_cpu(base->cpu))
-+ wake_up_nohz_cpu(base->cpu);
-+ 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.
-- */
-- if (base->nohz_active) {
-- if (!(timer->flags & TIMER_DEFERRABLE) ||
-- tick_nohz_full_cpu(base->cpu))
-- wake_up_nohz_cpu(base->cpu);
-- }
-+ * 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 @@
- {
- 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 @@
- 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 @@
-
- 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 @@
- */
- 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 @@
- */
- 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 @@
- */
- 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 @@
- 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 @@
- */
- 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 @@
- 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 @@
- */
- 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 @@
- 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 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 @@
- }
- }
-
--#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;
-+
-+ timer = hlist_entry(head->first, struct timer_list, entry);
-+ timer_stats_account_timer(timer);
-
-- spin_lock_irq(&base->lock);
-+ base->running_timer = timer;
-+ detach_timer(timer, true);
-
-- while (time_after_eq(jiffies, base->timer_jiffies)) {
-- struct hlist_head work_list;
-- struct hlist_head *head = &work_list;
-- int index;
-+ fn = timer->function;
-+ data = timer->data;
-
-- if (!base->all_timers) {
-- base->timer_jiffies = jiffies;
-- break;
-+ 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);
- }
-+ }
-+}
-
-- index = base->timer_jiffies & TVR_MASK;
-+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;
-
-- /*
-- * 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);
-- }
-+ 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;
- }
-- base->running_timer = NULL;
-- spin_unlock_irq(&base->lock);
-+ 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.
-- */
--static unsigned long __next_timer_interrupt(struct tvec_base *base)
--{
-- 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];
--
-- /* 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;
--
-- found = 1;
-- expires = nte->expires;
-- /* Look at the cascade bucket(s)? */
-- if (!index || slot < index)
-- goto cascade;
-- return expires;
-- }
-- slot = (slot + 1) & TVR_MASK;
-- } while (slot != index);
-+ * 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 int next_pending_bucket(struct timer_base *base, unsigned offset,
-+ unsigned clk)
-+{
-+ unsigned pos, start = offset + clk;
-+ unsigned end = offset + LVL_SIZE;
-+
-+ pos = find_next_bit(base->pending_map, end, start);
-+ if (pos < end)
-+ return pos - start;
-
--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;
-+ 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;
-+ }
-+ /*
-+ * 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 @@
- */
- 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 @@
- 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 @@
-
- /* 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]);
-+
-+ irq_work_tick_soft();
-
-- if (time_after_eq(jiffies, base->timer_jiffies))
-- __run_timers(base);
-+ __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 @@
- */
- 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 @@
- 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 @@
- 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_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);
-
-- old_base->active_timers = 0;
-- old_base->all_timers = 0;
-+ for (i = 0; i < WHEEL_SIZE; i++)
-+ migrate_timer_list(new_base, old_base->vectors + i);
-
-- spin_unlock(&old_base->lock);
-- spin_unlock_irq(&new_base->lock);
-- put_cpu_ptr(&tvec_bases);
-+ raw_spin_unlock(&old_base->lock);
-+ raw_spin_unlock_irq(&new_base->lock);
-+ put_cpu_ptr(&timer_bases);
-+ }
- }
-
- static int timer_cpu_notify(struct notifier_block *self,
-@@ -1652,13 +1908,18 @@
-
- static void __init init_timer_cpu(int cpu)
- {
-- struct tvec_base *base = per_cpu_ptr(&tvec_bases, cpu);
--
-- base->cpu = cpu;
-- spin_lock_init(&base->lock);
-+ struct timer_base *base;
-+ int i;
-
-- 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 -Nur linux-4.6.6.orig/kernel/trace/Kconfig linux-4.6.6/kernel/trace/Kconfig
---- linux-4.6.6.orig/kernel/trace/Kconfig 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/trace/Kconfig 2016-08-22 21:27:47.425893881 +0200
-@@ -187,6 +187,24 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/kernel/trace/latency_hist.c linux-4.6.6/kernel/trace/latency_hist.c
---- linux-4.6.6.orig/kernel/trace/latency_hist.c 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/kernel/trace/latency_hist.c 2016-08-22 21:27:47.425893881 +0200
-@@ -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 -Nur linux-4.6.6.orig/kernel/trace/Makefile linux-4.6.6/kernel/trace/Makefile
---- linux-4.6.6.orig/kernel/trace/Makefile 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/trace/Makefile 2016-08-22 21:27:47.425893881 +0200
-@@ -36,6 +36,10 @@
- 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 -Nur linux-4.6.6.orig/kernel/trace/trace.c linux-4.6.6/kernel/trace/trace.c
---- linux-4.6.6.orig/kernel/trace/trace.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/trace/trace.c 2016-08-22 21:27:47.429894141 +0200
-@@ -1657,6 +1657,7 @@
- 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 @@
- ((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 @@
-
- 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 @@
- 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 -Nur linux-4.6.6.orig/kernel/trace/trace_events.c linux-4.6.6/kernel/trace/trace_events.c
---- linux-4.6.6.orig/kernel/trace/trace_events.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/trace/trace_events.c 2016-08-22 21:27:47.429894141 +0200
-@@ -188,6 +188,8 @@
- __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 @@
-
- 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 -Nur linux-4.6.6.orig/kernel/trace/trace.h linux-4.6.6/kernel/trace/trace.h
---- linux-4.6.6.orig/kernel/trace/trace.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/trace/trace.h 2016-08-22 21:27:47.429894141 +0200
-@@ -117,6 +117,7 @@
- * 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 @@
- 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 -Nur linux-4.6.6.orig/kernel/trace/trace_irqsoff.c linux-4.6.6/kernel/trace/trace_irqsoff.c
---- linux-4.6.6.orig/kernel/trace/trace_irqsoff.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/trace/trace_irqsoff.c 2016-08-22 21:27:47.429894141 +0200
-@@ -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 @@
- {
- 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 @@
- #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 @@
- {
- 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 @@
- */
- 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 @@
- {
- 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 @@
- {
- 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 @@
- #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 -Nur linux-4.6.6.orig/kernel/trace/trace_output.c linux-4.6.6/kernel/trace/trace_output.c
---- linux-4.6.6.orig/kernel/trace/trace_output.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/trace/trace_output.c 2016-08-22 21:27:47.429894141 +0200
-@@ -386,6 +386,7 @@
- {
- char hardsoft_irq;
- char need_resched;
-+ char need_resched_lazy;
- char irqs_off;
- int hardirq;
- int softirq;
-@@ -416,6 +417,9 @@
- break;
- }
-
-+ need_resched_lazy =
-+ (entry->flags & TRACE_FLAG_NEED_RESCHED_LAZY) ? 'L' : '.';
-+
- hardsoft_irq =
- (nmi && hardirq) ? 'Z' :
- nmi ? 'z' :
-@@ -424,14 +428,25 @@
- 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 -Nur linux-4.6.6.orig/kernel/user.c linux-4.6.6/kernel/user.c
---- linux-4.6.6.orig/kernel/user.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/user.c 2016-08-22 21:27:47.429894141 +0200
-@@ -161,11 +161,11 @@
- 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 -Nur linux-4.6.6.orig/kernel/watchdog.c linux-4.6.6/kernel/watchdog.c
---- linux-4.6.6.orig/kernel/watchdog.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/watchdog.c 2016-08-22 21:27:47.429894141 +0200
-@@ -315,6 +315,8 @@
-
- #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 @@
- /* 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 @@
- !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 @@
- /* 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 -Nur linux-4.6.6.orig/kernel/workqueue.c linux-4.6.6/kernel/workqueue.c
---- linux-4.6.6.orig/kernel/workqueue.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/workqueue.c 2016-08-22 21:27:47.433894394 +0200
-@@ -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 @@
- * 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 @@
- *
- * 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 @@
- 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 @@
- /*
- * 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 @@
- 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 @@
- #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 @@
- * @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 @@
- * @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 @@
- 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 @@
- * @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 @@
- * @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 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 @@
- * 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 @@
- {
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- * 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 @@
- 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 @@
- /* 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 @@
-
- insert_work(pwq, work, worklist, work_flags);
-
-+out:
- spin_unlock(&pwq->pool->lock);
-+ rcu_read_unlock();
- }
-
- /**
-@@ -1504,14 +1534,14 @@
- 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 @@
- 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 @@
-
- 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 @@
- 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 @@
- 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 @@
- 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 @@
-
- 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 @@
- 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 @@
-
- /* 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 @@
- */
- 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 @@
-
- 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 @@
- * 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 @@
- 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 @@
- 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 @@
- * 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- spin_unlock_irqrestore(&pool->lock, flags);
- }
-
-- rcu_read_unlock_sched();
-+ rcu_read_unlock();
- }
-
- /*
-@@ -4819,16 +4858,16 @@
- * 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 @@
- 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 @@
- delim = " ";
- }
- written += scnprintf(buf + written, PAGE_SIZE - written, "\n");
-- rcu_read_unlock_sched();
-+ rcu_read_unlock();
-+ put_online_cpus();
-
- return written;
- }
-diff -Nur linux-4.6.6.orig/kernel/workqueue_internal.h linux-4.6.6/kernel/workqueue_internal.h
---- linux-4.6.6.orig/kernel/workqueue_internal.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/kernel/workqueue_internal.h 2016-08-22 21:27:47.433894394 +0200
-@@ -43,6 +43,7 @@
- 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 @@
- * 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 -Nur linux-4.6.6.orig/lib/debugobjects.c linux-4.6.6/lib/debugobjects.c
---- linux-4.6.6.orig/lib/debugobjects.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/lib/debugobjects.c 2016-08-22 21:27:47.433894394 +0200
-@@ -309,7 +309,10 @@
- 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 -Nur linux-4.6.6.orig/lib/idr.c linux-4.6.6/lib/idr.c
---- linux-4.6.6.orig/lib/idr.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/lib/idr.c 2016-08-22 21:27:47.433894394 +0200
-@@ -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(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 @@
- * 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 @@
- idr_mark_full(pa, id);
- }
-
--
- /**
- * idr_preload - preload for idr_alloc()
- * @gfp_mask: allocation mask to use for preloading
-@@ -401,7 +432,7 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/lib/irq_poll.c linux-4.6.6/lib/irq_poll.c
---- linux-4.6.6.orig/lib/irq_poll.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/lib/irq_poll.c 2016-08-22 21:27:47.433894394 +0200
-@@ -36,6 +36,7 @@
- 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 @@
- 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 @@
- }
-
- 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 @@
- __raise_softirq_irqoff(IRQ_POLL_SOFTIRQ);
-
- local_irq_enable();
-+ preempt_check_resched_rt();
- }
-
- /**
-@@ -199,6 +203,7 @@
- this_cpu_ptr(&blk_cpu_iopoll));
- __raise_softirq_irqoff(IRQ_POLL_SOFTIRQ);
- local_irq_enable();
-+ preempt_check_resched_rt();
- }
-
- return NOTIFY_OK;
-diff -Nur linux-4.6.6.orig/lib/Kconfig linux-4.6.6/lib/Kconfig
---- linux-4.6.6.orig/lib/Kconfig 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/lib/Kconfig 2016-08-22 21:27:47.433894394 +0200
-@@ -397,6 +397,7 @@
-
- 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 -Nur linux-4.6.6.orig/lib/locking-selftest.c linux-4.6.6/lib/locking-selftest.c
---- linux-4.6.6.orig/lib/locking-selftest.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/lib/locking-selftest.c 2016-08-22 21:27:47.433894394 +0200
-@@ -590,6 +590,8 @@
- #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 @@
- #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 @@
- #undef E1
- #undef E2
-
-+#endif
-+
- /*
- * Enabling irqs with an irq-safe lock held:
- */
-@@ -663,6 +670,8 @@
- #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 @@
- #include "locking-selftest-wlock-softirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock)
-
-+#endif
-+
- #undef E1
- #undef E2
-
-@@ -709,6 +720,8 @@
- #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 @@
- #include "locking-selftest-wlock-softirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock)
-
-+#endif
-+
- #undef E1
- #undef E2
- #undef E3
-@@ -757,6 +772,8 @@
- #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 @@
- #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 @@
- #undef E2
- #undef E3
-
-+#endif
-+
-+#ifndef CONFIG_PREEMPT_RT_FULL
-+
- /*
- * read-lock / write-lock recursion that is actually safe.
- */
-@@ -876,6 +901,8 @@
- #undef E2
- #undef E3
-
-+#endif
-+
- /*
- * read-lock / write-lock recursion that is unsafe.
- */
-@@ -1858,6 +1885,7 @@
-
- printk(" --------------------------------------------------------------------------\n");
-
-+#ifndef CONFIG_PREEMPT_RT_FULL
- /*
- * irq-context testcases:
- */
-@@ -1870,6 +1898,28 @@
-
- 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 -Nur linux-4.6.6.orig/lib/percpu_ida.c linux-4.6.6/lib/percpu_ida.c
---- linux-4.6.6.orig/lib/percpu_ida.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/lib/percpu_ida.c 2016-08-22 21:27:47.433894394 +0200
-@@ -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 @@
- 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 @@
-
- if (!tags->nr_free)
- alloc_global_tags(pool, tags);
-+
- if (!tags->nr_free)
- steal_tags(pool, tags);
-
-@@ -184,7 +188,7 @@
- }
-
- 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 @@
-
- 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 @@
-
- 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 @@
- 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 @@
- 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 @@
- }
- 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 -Nur linux-4.6.6.orig/lib/radix-tree.c linux-4.6.6/lib/radix-tree.c
---- linux-4.6.6.orig/lib/radix-tree.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/lib/radix-tree.c 2016-08-22 21:27:47.433894394 +0200
-@@ -240,13 +240,14 @@
- * 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 @@
- 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 @@
- return 0;
- }
- EXPORT_SYMBOL(radix_tree_maybe_preload);
-+#endif
-
- /*
- * Return the maximum key which can be store into a
-diff -Nur linux-4.6.6.orig/lib/random32.c linux-4.6.6/lib/random32.c
---- linux-4.6.6.orig/lib/random32.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/lib/random32.c 2016-08-22 21:27:47.433894394 +0200
-@@ -233,7 +233,6 @@
-
- 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 -Nur linux-4.6.6.orig/lib/rbtree.c linux-4.6.6/lib/rbtree.c
---- linux-4.6.6.orig/lib/rbtree.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/lib/rbtree.c 2016-08-22 21:27:47.437894654 +0200
-@@ -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 @@
- 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 -Nur linux-4.6.6.orig/lib/scatterlist.c linux-4.6.6/lib/scatterlist.c
---- linux-4.6.6.orig/lib/scatterlist.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/lib/scatterlist.c 2016-08-22 21:27:47.437894654 +0200
-@@ -620,7 +620,7 @@
- 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 @@
- 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 @@
-
- sg_miter_stop(&miter);
-
-- local_irq_restore(flags);
-+ local_irq_restore_nort(flags);
- return offset;
- }
- EXPORT_SYMBOL(sg_copy_buffer);
-diff -Nur linux-4.6.6.orig/lib/smp_processor_id.c linux-4.6.6/lib/smp_processor_id.c
---- linux-4.6.6.orig/lib/smp_processor_id.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/lib/smp_processor_id.c 2016-08-22 21:27:47.437894654 +0200
-@@ -39,8 +39,9 @@
- 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 -Nur linux-4.6.6.orig/localversion-rt linux-4.6.6/localversion-rt
---- linux-4.6.6.orig/localversion-rt 1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.6.6/localversion-rt 2016-08-22 21:27:47.437894654 +0200
-@@ -0,0 +1 @@
-+-rt10
-diff -Nur linux-4.6.6.orig/mm/backing-dev.c linux-4.6.6/mm/backing-dev.c
---- linux-4.6.6.orig/mm/backing-dev.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/mm/backing-dev.c 2016-08-22 21:27:47.437894654 +0200
-@@ -457,9 +457,9 @@
- {
- 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 -Nur linux-4.6.6.orig/mm/compaction.c linux-4.6.6/mm/compaction.c
---- linux-4.6.6.orig/mm/compaction.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/mm/compaction.c 2016-08-22 21:27:47.437894654 +0200
-@@ -1409,10 +1409,12 @@
- 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 -Nur linux-4.6.6.orig/mm/filemap.c linux-4.6.6/mm/filemap.c
---- linux-4.6.6.orig/mm/filemap.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/mm/filemap.c 2016-08-22 21:27:47.437894654 +0200
-@@ -169,7 +169,9 @@
- 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 @@
- * 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 -Nur linux-4.6.6.orig/mm/highmem.c linux-4.6.6/mm/highmem.c
---- linux-4.6.6.orig/mm/highmem.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/mm/highmem.c 2016-08-22 21:27:47.437894654 +0200
-@@ -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 @@
- 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 -Nur linux-4.6.6.orig/mm/Kconfig linux-4.6.6/mm/Kconfig
---- linux-4.6.6.orig/mm/Kconfig 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/mm/Kconfig 2016-08-22 21:27:47.437894654 +0200
-@@ -391,7 +391,7 @@
-
- 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 -Nur linux-4.6.6.orig/mm/memcontrol.c linux-4.6.6/mm/memcontrol.c
---- linux-4.6.6.orig/mm/memcontrol.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/mm/memcontrol.c 2016-08-22 21:27:47.441894907 +0200
-@@ -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 @@
- #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 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 @@
- 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 @@
- schedule_work_on(cpu, &stock->work);
- }
- }
-- put_cpu();
-+ put_cpu_light();
- put_online_cpus();
- mutex_unlock(&percpu_charge_mutex);
- }
-@@ -4551,12 +4557,12 @@
-
- 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:
-@@ -5406,10 +5412,10 @@
-
- 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) };
-@@ -5461,14 +5467,14 @@
- 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);
-@@ -5787,6 +5793,7 @@
- {
- 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);
-diff -Nur linux-4.6.6.orig/mm/mmu_context.c linux-4.6.6/mm/mmu_context.c
---- linux-4.6.6.orig/mm/mmu_context.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/mm/mmu_context.c 2016-08-22 21:27:47.441894907 +0200
-@@ -23,6 +23,7 @@
- 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 @@
- }
- 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 -Nur linux-4.6.6.orig/mm/page_alloc.c linux-4.6.6/mm/page_alloc.c
---- linux-4.6.6.orig/mm/page_alloc.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/mm/page_alloc.c 2016-08-22 21:27:47.441894907 +0200
-@@ -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_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
-@@ -816,7 +829,7 @@
- }
-
- /*
-- * 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.
- *
-@@ -827,18 +840,53 @@
- * 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;
-@@ -854,7 +902,7 @@
- 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. */
-@@ -862,24 +910,12 @@
- 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,
-@@ -888,7 +924,9 @@
- 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);
-@@ -898,7 +936,7 @@
- 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)
-@@ -1072,10 +1110,10 @@
- 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,
-@@ -2017,16 +2055,18 @@
- 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
-
-@@ -2042,16 +2082,21 @@
- 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);
- }
-
- /*
-@@ -2137,8 +2182,17 @@
- 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
-@@ -2194,7 +2248,7 @@
-
- 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);
-
- /*
-@@ -2220,12 +2274,17 @@
- 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);
- }
-
- /*
-@@ -2360,7 +2419,7 @@
- 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)) {
-@@ -2384,7 +2443,7 @@
- * 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) {
-@@ -2394,11 +2453,13 @@
- }
- 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));
-@@ -2408,13 +2469,13 @@
-
- __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;
- }
-
-@@ -6215,7 +6276,9 @@
- 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);
-
- /*
-@@ -6241,6 +6304,7 @@
- void __init page_alloc_init(void)
- {
- hotcpu_notifier(page_alloc_cpu_notify, 0);
-+ local_irq_lock_init(pa_lock);
- }
-
- /*
-@@ -7165,7 +7229,7 @@
- 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);
-@@ -7174,7 +7238,7 @@
- free_percpu(zone->pageset);
- zone->pageset = &boot_pageset;
- }
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(pa_lock, flags);
- }
-
- #ifdef CONFIG_MEMORY_HOTREMOVE
-diff -Nur linux-4.6.6.orig/mm/slab.h linux-4.6.6/mm/slab.h
---- linux-4.6.6.orig/mm/slab.h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/mm/slab.h 2016-08-22 21:27:47.441894907 +0200
-@@ -415,7 +415,11 @@
- * 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 -Nur linux-4.6.6.orig/mm/slub.c linux-4.6.6/mm/slub.c
---- linux-4.6.6.orig/mm/slub.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/mm/slub.c 2016-08-22 21:27:47.445895167 +0200
-@@ -1143,7 +1143,7 @@
- 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 @@
- 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 @@
-
- #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 @@
- 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 @@
- page->frozen = 1;
-
- out:
-- if (gfpflags_allow_blocking(flags))
-+ if (enableirqs)
- local_irq_disable();
- if (!page)
- return NULL;
-@@ -1543,6 +1556,16 @@
- __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 @@
- }
-
- 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 @@
- 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 @@
- break;
-
- }
-- spin_unlock(&n->list_lock);
-+ raw_spin_unlock(&n->list_lock);
- return object;
- }
-
-@@ -1952,7 +1981,7 @@
- * 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 @@
- * 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 @@
- 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 @@
- 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 @@
- }
-
- if (n)
-- spin_unlock(&n->list_lock);
-+ raw_spin_unlock(&n->list_lock);
-
- while (discard_page) {
- page = discard_page;
-@@ -2101,14 +2130,21 @@
- 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 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 @@
- 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 @@
- * 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 @@
- 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 @@
- deactivate_slab(s, page, get_freepointer(s, freelist));
- c->page = NULL;
- c->freelist = NULL;
-- return freelist;
-+ goto out;
- }
-
- /*
-@@ -2461,6 +2521,7 @@
- {
- void *p;
- unsigned long flags;
-+ LIST_HEAD(tofree);
-
- local_irq_save(flags);
- #ifdef CONFIG_PREEMPT
-@@ -2472,8 +2533,9 @@
- 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 @@
-
- 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 @@
- * 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 @@
- 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 @@
- 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 @@
- void **p)
- {
- struct kmem_cache_cpu *c;
-+ LIST_HEAD(to_free);
- int i;
-
- /* memcg and kmem_cache debug support */
-@@ -2958,7 +3021,7 @@
- * 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 @@
- }
- 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 @@
- 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 @@
- 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 @@
- slab_unlock(page);
- kfree(map);
- #endif
-+#endif
- }
-
- /*
-@@ -3482,7 +3551,7 @@
- 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 @@
- "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 @@
- 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 @@
- 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 @@
- {
- 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 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/mm/swap.c linux-4.6.6/mm/swap.c
---- linux-4.6.6.orig/mm/swap.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/mm/swap.c 2016-08-22 21:37:54.852846351 +0200
-@@ -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_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 @@
- 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) || PageCompound(page))
- pagevec_move_tail(pvec);
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(rotate_lock, flags);
- }
- }
-
-@@ -292,12 +296,13 @@
- 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) || PageCompound(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 @@
-
- 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 @@
- }
- }
-
-- put_cpu_var(lru_add_pvec);
-+ put_locked_var(swapvec_lock, lru_add_pvec);
- }
-
- /*
-@@ -387,12 +392,12 @@
-
- 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_add(pvec, page) || PageCompound(page))
- __pagevec_lru_add(pvec);
-- put_cpu_var(lru_add_pvec);
-+ put_locked_var(swapvec_lock, lru_add_pvec);
- }
-
- /**
-@@ -590,9 +595,15 @@
- 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_unlock_irqrestore_on(rotate_lock, flags, cpu);
-+#else
-+ local_lock_irqsave(rotate_lock, flags);
- pagevec_move_tail(pvec);
-- local_irq_restore(flags);
-+ local_unlock_irqrestore(rotate_lock, flags);
-+#endif
- }
-
- pvec = &per_cpu(lru_deactivate_file_pvecs, cpu);
-@@ -643,27 +654,47 @@
- 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_file_pvecs);
-
- get_page(page);
- if (!pagevec_add(pvec, page) || PageCompound(page))
- pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL);
-- put_cpu_var(lru_deactivate_pvecs);
-+ put_locked_var(swapvec_lock, lru_deactivate_file_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)
- {
-@@ -676,21 +707,18 @@
- 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 -Nur linux-4.6.6.orig/mm/truncate.c linux-4.6.6/mm/truncate.c
---- linux-4.6.6.orig/mm/truncate.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/mm/truncate.c 2016-08-22 21:27:47.445895167 +0200
-@@ -63,9 +63,12 @@
- * 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 -Nur linux-4.6.6.orig/mm/vmalloc.c linux-4.6.6/mm/vmalloc.c
---- linux-4.6.6.orig/mm/vmalloc.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/mm/vmalloc.c 2016-08-22 21:27:47.445895167 +0200
-@@ -819,7 +819,7 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- break;
- }
-
-- put_cpu_var(vmap_block_queue);
-+ put_cpu_light();
- rcu_read_unlock();
-
- /* Allocate new block if nothing was found */
-diff -Nur linux-4.6.6.orig/mm/vmstat.c linux-4.6.6/mm/vmstat.c
---- linux-4.6.6.orig/mm/vmstat.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/mm/vmstat.c 2016-08-22 21:27:47.445895167 +0200
-@@ -226,6 +226,7 @@
- long x;
- long t;
-
-+ preempt_disable_rt();
- x = delta + __this_cpu_read(*p);
-
- t = __this_cpu_read(pcp->stat_threshold);
-@@ -235,6 +236,7 @@
- x = 0;
- }
- __this_cpu_write(*p, x);
-+ preempt_enable_rt();
- }
- EXPORT_SYMBOL(__mod_zone_page_state);
-
-@@ -267,6 +269,7 @@
- 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 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/mm/workingset.c linux-4.6.6/mm/workingset.c
---- linux-4.6.6.orig/mm/workingset.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/mm/workingset.c 2016-08-22 21:27:47.445895167 +0200
-@@ -335,7 +335,8 @@
- * 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/mm/zsmalloc.c linux-4.6.6/mm/zsmalloc.c
---- linux-4.6.6.orig/mm/zsmalloc.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/mm/zsmalloc.c 2016-08-22 21:27:47.449895420 +0200
-@@ -1292,7 +1292,7 @@
- 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 @@
-
- __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 -Nur linux-4.6.6.orig/net/core/dev.c linux-4.6.6/net/core/dev.c
---- linux-4.6.6.orig/net/core/dev.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/net/core/dev.c 2016-08-22 21:27:47.449895420 +0200
-@@ -188,6 +188,7 @@
- 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 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 @@
- 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 @@
- 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 @@
- 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 @@
- /* 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 @@
- }
-
- return err;
-+
-+outunlock:
-+ __raw_write_seqcount_end(&devnet_rename_seq);
-+ mutex_unlock(&devnet_rename_mutex);
-+ return err;
- }
-
- /**
-@@ -2264,6 +2270,7 @@
- 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 @@
- __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 @@
- * 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 @@
- #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 @@
-
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
-
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- } else
- #endif
- local_irq_enable();
-+ preempt_check_resched_rt();
- }
-
- static bool sd_has_rps_ipi_waiting(struct softnet_data *sd)
-@@ -4829,6 +4910,7 @@
- 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 @@
- 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 @@
- 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 @@
-
- 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 @@
- 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 -Nur linux-4.6.6.orig/net/core/skbuff.c linux-4.6.6/net/core/skbuff.c
---- linux-4.6.6.orig/net/core/skbuff.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/net/core/skbuff.c 2016-08-22 21:27:47.449895420 +0200
-@@ -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 @@
-
- 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 @@
- 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 @@
-
- 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 @@
- 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 @@
- 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 @@
- 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 @@
- }
-
- /* 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 @@
-
- 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 @@
- 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 -Nur linux-4.6.6.orig/net/core/sock.c linux-4.6.6/net/core/sock.c
---- linux-4.6.6.orig/net/core/sock.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/net/core/sock.c 2016-08-22 21:27:47.453895680 +0200
-@@ -2421,12 +2421,11 @@
- 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 -Nur linux-4.6.6.orig/net/ipv4/icmp.c linux-4.6.6/net/ipv4/icmp.c
---- linux-4.6.6.orig/net/ipv4/icmp.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/net/ipv4/icmp.c 2016-08-22 21:27:47.453895680 +0200
-@@ -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 @@
- }
-
- /*
-+ * 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 @@
- 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 -Nur linux-4.6.6.orig/net/ipv4/inet_connection_sock.c linux-4.6.6/net/ipv4/inet_connection_sock.c
---- linux-4.6.6.orig/net/ipv4/inet_connection_sock.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/net/ipv4/inet_connection_sock.c 2016-08-22 21:27:47.453895680 +0200
-@@ -603,7 +603,7 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/net/ipv4/inet_timewait_sock.c linux-4.6.6/net/ipv4/inet_timewait_sock.c
---- linux-4.6.6.orig/net/ipv4/inet_timewait_sock.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/net/ipv4/inet_timewait_sock.c 2016-08-22 21:27:47.453895680 +0200
-@@ -188,7 +188,8 @@
- 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 @@
-
- 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 -Nur linux-4.6.6.orig/net/ipv4/sysctl_net_ipv4.c linux-4.6.6/net/ipv4/sysctl_net_ipv4.c
---- linux-4.6.6.orig/net/ipv4/sysctl_net_ipv4.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/net/ipv4/sysctl_net_ipv4.c 2016-08-22 21:27:47.453895680 +0200
-@@ -681,6 +681,13 @@
- .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 -Nur linux-4.6.6.orig/net/mac80211/rx.c linux-4.6.6/net/mac80211/rx.c
---- linux-4.6.6.orig/net/mac80211/rx.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/net/mac80211/rx.c 2016-08-22 21:27:47.453895680 +0200
-@@ -3679,7 +3679,7 @@
- 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 -Nur linux-4.6.6.orig/net/netfilter/core.c linux-4.6.6/net/netfilter/core.c
---- linux-4.6.6.orig/net/netfilter/core.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/net/netfilter/core.c 2016-08-22 21:27:47.453895680 +0200
-@@ -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 -Nur linux-4.6.6.orig/net/packet/af_packet.c linux-4.6.6/net/packet/af_packet.c
---- linux-4.6.6.orig/net/packet/af_packet.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/net/packet/af_packet.c 2016-08-22 21:27:47.457895933 +0200
-@@ -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 @@
- 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 @@
- 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 -Nur linux-4.6.6.orig/net/rds/ib_rdma.c linux-4.6.6/net/rds/ib_rdma.c
---- linux-4.6.6.orig/net/rds/ib_rdma.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/net/rds/ib_rdma.c 2016-08-22 21:27:47.457895933 +0200
-@@ -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 @@
- 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 -Nur linux-4.6.6.orig/net/sched/sch_generic.c linux-4.6.6/net/sched/sch_generic.c
---- linux-4.6.6.orig/net/sched/sch_generic.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/net/sched/sch_generic.c 2016-08-22 21:27:47.457895933 +0200
-@@ -894,7 +894,7 @@
- /* 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 -Nur linux-4.6.6.orig/net/sunrpc/svc_xprt.c linux-4.6.6/net/sunrpc/svc_xprt.c
---- linux-4.6.6.orig/net/sunrpc/svc_xprt.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/net/sunrpc/svc_xprt.c 2016-08-22 21:27:47.457895933 +0200
-@@ -344,7 +344,7 @@
- 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 @@
-
- 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 @@
- goto redo_search;
- }
- rqstp = NULL;
-- put_cpu();
-+ put_cpu_light();
- out:
- trace_svc_xprt_do_enqueue(xprt, rqstp);
- }
-diff -Nur linux-4.6.6.orig/scripts/mkcompile_h linux-4.6.6/scripts/mkcompile_h
---- linux-4.6.6.orig/scripts/mkcompile_h 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/scripts/mkcompile_h 2016-08-22 21:27:47.457895933 +0200
-@@ -4,7 +4,8 @@
- ARCH=$2
- SMP=$3
- PREEMPT=$4
--CC=$5
-+RT=$5
-+CC=$6
-
- vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
-
-@@ -57,6 +58,7 @@
- CONFIG_FLAGS=""
- if [ -n "$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 -Nur linux-4.6.6.orig/sound/core/pcm_native.c linux-4.6.6/sound/core/pcm_native.c
---- linux-4.6.6.orig/sound/core/pcm_native.c 2016-08-10 12:54:57.000000000 +0200
-+++ linux-4.6.6/sound/core/pcm_native.c 2016-08-22 21:27:47.457895933 +0200
-@@ -135,7 +135,7 @@
- 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 @@
- {
- 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 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 @@
- {
- 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);
-
diff --git a/target/linux/patches/4.6.6/revert-sparc.patch b/target/linux/patches/4.6.6/revert-sparc.patch
deleted file mode 100644
index d5bb8ad37..000000000
--- a/target/linux/patches/4.6.6/revert-sparc.patch
+++ /dev/null
@@ -1,295 +0,0 @@
-diff -Nur linux-4.6.4.orig/arch/sparc/kernel/signal_32.c linux-4.6.4/arch/sparc/kernel/signal_32.c
---- linux-4.6.4.orig/arch/sparc/kernel/signal_32.c 2016-07-11 18:30:07.000000000 +0200
-+++ linux-4.6.4/arch/sparc/kernel/signal_32.c 2016-07-18 21:55:43.720763787 +0200
-@@ -60,22 +60,10 @@
- #define SF_ALIGNEDSZ (((sizeof(struct signal_frame) + 7) & (~7)))
- #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7)))
-
--/* Checks if the fp is valid. We always build signal frames which are
-- * 16-byte aligned, therefore we can always enforce that the restore
-- * frame has that property as well.
-- */
--static inline bool invalid_frame_pointer(void __user *fp, int fplen)
--{
-- if ((((unsigned long) fp) & 15) || !__access_ok((unsigned long)fp, fplen))
-- return true;
--
-- return false;
--}
--
- asmlinkage void do_sigreturn(struct pt_regs *regs)
- {
-- unsigned long up_psr, pc, npc, ufp;
- struct signal_frame __user *sf;
-+ unsigned long up_psr, pc, npc;
- sigset_t set;
- __siginfo_fpu_t __user *fpu_save;
- __siginfo_rwin_t __user *rwin_save;
-@@ -89,13 +77,10 @@
- sf = (struct signal_frame __user *) regs->u_regs[UREG_FP];
-
- /* 1. Make sure we are not getting garbage from the user */
-- if (!invalid_frame_pointer(sf, sizeof(*sf)))
-+ if (!access_ok(VERIFY_READ, sf, sizeof(*sf)))
- goto segv_and_exit;
-
-- if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP]))
-- goto segv_and_exit;
--
-- if (ufp & 0x7)
-+ if (((unsigned long) sf) & 3)
- goto segv_and_exit;
-
- err = __get_user(pc, &sf->info.si_regs.pc);
-@@ -142,7 +127,7 @@
- asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
- {
- struct rt_signal_frame __user *sf;
-- unsigned int psr, pc, npc, ufp;
-+ unsigned int psr, pc, npc;
- __siginfo_fpu_t __user *fpu_save;
- __siginfo_rwin_t __user *rwin_save;
- sigset_t set;
-@@ -150,13 +135,8 @@
-
- synchronize_user_stack();
- sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP];
-- if (!invalid_frame_pointer(sf, sizeof(*sf)))
-- goto segv;
--
-- if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
-- goto segv;
--
-- if (ufp & 0x7)
-+ if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
-+ (((unsigned long) sf) & 0x03))
- goto segv;
-
- err = __get_user(pc, &sf->regs.pc);
-@@ -198,6 +178,15 @@
- force_sig(SIGSEGV, current);
- }
-
-+/* Checks if the fp is valid */
-+static inline int invalid_frame_pointer(void __user *fp, int fplen)
-+{
-+ if ((((unsigned long) fp) & 7) || !__access_ok((unsigned long)fp, fplen))
-+ return 1;
-+
-+ return 0;
-+}
-+
- static inline void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
- {
- unsigned long sp = regs->u_regs[UREG_FP];
-diff -Nur linux-4.6.4.orig/arch/sparc/kernel/signal32.c linux-4.6.4/arch/sparc/kernel/signal32.c
---- linux-4.6.4.orig/arch/sparc/kernel/signal32.c 2016-07-11 18:30:07.000000000 +0200
-+++ linux-4.6.4/arch/sparc/kernel/signal32.c 2016-07-18 21:56:41.807007836 +0200
-@@ -138,24 +138,12 @@
- return 0;
- }
-
--/* Checks if the fp is valid. We always build signal frames which are
-- * 16-byte aligned, therefore we can always enforce that the restore
-- * frame has that property as well.
-- */
--static bool invalid_frame_pointer(void __user *fp, int fplen)
--{
-- if ((((unsigned long) fp) & 15) ||
-- ((unsigned long)fp) > 0x100000000ULL - fplen)
-- return true;
-- return false;
--}
--
- void do_sigreturn32(struct pt_regs *regs)
- {
- struct signal_frame32 __user *sf;
- compat_uptr_t fpu_save;
- compat_uptr_t rwin_save;
-- unsigned int psr, ufp;
-+ unsigned int psr;
- unsigned int pc, npc;
- sigset_t set;
- compat_sigset_t seta;
-@@ -170,16 +158,11 @@
- sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
-
- /* 1. Make sure we are not getting garbage from the user */
-- if (invalid_frame_pointer(sf, sizeof(*sf)))
-- goto segv;
--
-- if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP]))
-- goto segv;
--
-- if (ufp & 0x7)
-+ if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
-+ (((unsigned long) sf) & 3))
- goto segv;
-
-- if (__get_user(pc, &sf->info.si_regs.pc) ||
-+ if (get_user(pc, &sf->info.si_regs.pc) ||
- __get_user(npc, &sf->info.si_regs.npc))
- goto segv;
-
-@@ -244,7 +227,7 @@
- asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
- {
- struct rt_signal_frame32 __user *sf;
-- unsigned int psr, pc, npc, ufp;
-+ unsigned int psr, pc, npc;
- compat_uptr_t fpu_save;
- compat_uptr_t rwin_save;
- sigset_t set;
-@@ -259,16 +242,11 @@
- sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
-
- /* 1. Make sure we are not getting garbage from the user */
-- if (invalid_frame_pointer(sf, sizeof(*sf)))
-+ if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
-+ (((unsigned long) sf) & 3))
- goto segv;
-
-- if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
-- goto segv;
--
-- if (ufp & 0x7)
-- goto segv;
--
-- if (__get_user(pc, &sf->regs.pc) ||
-+ if (get_user(pc, &sf->regs.pc) ||
- __get_user(npc, &sf->regs.npc))
- goto segv;
-
-@@ -329,6 +307,14 @@
- force_sig(SIGSEGV, current);
- }
-
-+/* Checks if the fp is valid */
-+static int invalid_frame_pointer(void __user *fp, int fplen)
-+{
-+ if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen)
-+ return 1;
-+ return 0;
-+}
-+
- static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
- {
- unsigned long sp;
-diff -Nur linux-4.6.4.orig/arch/sparc/kernel/signal_64.c linux-4.6.4/arch/sparc/kernel/signal_64.c
---- linux-4.6.4.orig/arch/sparc/kernel/signal_64.c 2016-07-11 18:30:07.000000000 +0200
-+++ linux-4.6.4/arch/sparc/kernel/signal_64.c 2016-07-18 21:55:43.720763787 +0200
-@@ -234,17 +234,6 @@
- goto out;
- }
-
--/* Checks if the fp is valid. We always build rt signal frames which
-- * are 16-byte aligned, therefore we can always enforce that the
-- * restore frame has that property as well.
-- */
--static bool invalid_frame_pointer(void __user *fp)
--{
-- if (((unsigned long) fp) & 15)
-- return true;
-- return false;
--}
--
- struct rt_signal_frame {
- struct sparc_stackf ss;
- siginfo_t info;
-@@ -257,8 +246,8 @@
-
- void do_rt_sigreturn(struct pt_regs *regs)
- {
-- unsigned long tpc, tnpc, tstate, ufp;
- struct rt_signal_frame __user *sf;
-+ unsigned long tpc, tnpc, tstate;
- __siginfo_fpu_t __user *fpu_save;
- __siginfo_rwin_t __user *rwin_save;
- sigset_t set;
-@@ -272,16 +261,10 @@
- (regs->u_regs [UREG_FP] + STACK_BIAS);
-
- /* 1. Make sure we are not getting garbage from the user */
-- if (invalid_frame_pointer(sf))
-- goto segv;
--
-- if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
-+ if (((unsigned long) sf) & 3)
- goto segv;
-
-- if ((ufp + STACK_BIAS) & 0x7)
-- goto segv;
--
-- err = __get_user(tpc, &sf->regs.tpc);
-+ err = get_user(tpc, &sf->regs.tpc);
- err |= __get_user(tnpc, &sf->regs.tnpc);
- if (test_thread_flag(TIF_32BIT)) {
- tpc &= 0xffffffff;
-@@ -325,6 +308,14 @@
- force_sig(SIGSEGV, current);
- }
-
-+/* Checks if the fp is valid */
-+static int invalid_frame_pointer(void __user *fp)
-+{
-+ if (((unsigned long) fp) & 15)
-+ return 1;
-+ return 0;
-+}
-+
- static inline void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
- {
- unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
-diff -Nur linux-4.6.4.orig/arch/sparc/kernel/sigutil_32.c linux-4.6.4/arch/sparc/kernel/sigutil_32.c
---- linux-4.6.4.orig/arch/sparc/kernel/sigutil_32.c 2016-07-11 18:30:07.000000000 +0200
-+++ linux-4.6.4/arch/sparc/kernel/sigutil_32.c 2016-07-18 21:55:43.720763787 +0200
-@@ -48,10 +48,6 @@
- int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
- {
- int err;
--
-- if (((unsigned long) fpu) & 3)
-- return -EFAULT;
--
- #ifdef CONFIG_SMP
- if (test_tsk_thread_flag(current, TIF_USEDFPU))
- regs->psr &= ~PSR_EF;
-@@ -101,10 +97,7 @@
- struct thread_info *t = current_thread_info();
- int i, wsaved, err;
-
-- if (((unsigned long) rp) & 3)
-- return -EFAULT;
--
-- get_user(wsaved, &rp->wsaved);
-+ __get_user(wsaved, &rp->wsaved);
- if (wsaved > NSWINS)
- return -EFAULT;
-
-diff -Nur linux-4.6.4.orig/arch/sparc/kernel/sigutil_64.c linux-4.6.4/arch/sparc/kernel/sigutil_64.c
---- linux-4.6.4.orig/arch/sparc/kernel/sigutil_64.c 2016-07-11 18:30:07.000000000 +0200
-+++ linux-4.6.4/arch/sparc/kernel/sigutil_64.c 2016-07-18 21:55:43.720763787 +0200
-@@ -37,10 +37,7 @@
- unsigned long fprs;
- int err;
-
-- if (((unsigned long) fpu) & 7)
-- return -EFAULT;
--
-- err = get_user(fprs, &fpu->si_fprs);
-+ err = __get_user(fprs, &fpu->si_fprs);
- fprs_write(0);
- regs->tstate &= ~TSTATE_PEF;
- if (fprs & FPRS_DL)
-@@ -75,10 +72,7 @@
- struct thread_info *t = current_thread_info();
- int i, wsaved, err;
-
-- if (((unsigned long) rp) & 7)
-- return -EFAULT;
--
-- get_user(wsaved, &rp->wsaved);
-+ __get_user(wsaved, &rp->wsaved);
- if (wsaved > NSWINS)
- return -EFAULT;
-
diff --git a/target/linux/patches/4.6.6/startup.patch b/target/linux/patches/4.6.6/startup.patch
deleted file mode 100644
index e54ac19a6..000000000
--- a/target/linux/patches/4.6.6/startup.patch
+++ /dev/null
@@ -1,34 +0,0 @@
-diff -Nur linux-4.4.6.orig/init/initramfs.c linux-4.4.6/init/initramfs.c
---- linux-4.4.6.orig/init/initramfs.c 2016-03-16 16:43:17.000000000 +0100
-+++ linux-4.4.6/init/initramfs.c 2016-03-27 14:15:43.931044532 +0200
-@@ -653,6 +653,9 @@
- */
- load_default_modules();
- }
-+#ifdef CONFIG_DEVTMPFS_MOUNT
-+ devtmpfs_mount("dev");
-+#endif
- return 0;
- }
- rootfs_initcall(populate_rootfs);
-diff -Nur linux-4.4.6.orig/init/main.c linux-4.4.6/init/main.c
---- linux-4.4.6.orig/init/main.c 2016-03-16 16:43:17.000000000 +0100
-+++ linux-4.4.6/init/main.c 2016-03-27 14:15:43.935044783 +0200
-@@ -1011,6 +1011,8 @@
- if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
- pr_err("Warning: unable to open an initial console.\n");
-
-+ printk(KERN_WARNING "Starting Linux (built with OpenADK).\n");
-+
- (void) sys_dup(0);
- (void) sys_dup(0);
- /*
-@@ -1019,7 +1021,7 @@
- */
-
- if (!ramdisk_execute_command)
-- ramdisk_execute_command = "/init";
-+ ramdisk_execute_command = "/sbin/init";
-
- if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
- ramdisk_execute_command = NULL;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-27 12:00:08 +0000