20 files changed, 3339 insertions, 3645 deletions

diff --git a/mk/kernel-ver.mk b/mk/kernel-ver.mk
index 58f95dd55..ecc5c26ef 100644
--- a/mk/kernel-ver.mk
+++ b/mk/kernel-ver.mk
@@ -22,10 +22,10 @@ KERNEL_VERSION:=	$(KERNEL_FILE_VER)-$(KERNEL_RELEASE)
 KERNEL_HASH:=		029098dcffab74875e086ae970e3828456838da6e0ba22ce3f64ef764f3d7f1a
 endif
 ifeq ($(ADK_TARGET_KERNEL_VERSION_4_8),y)
-KERNEL_FILE_VER:=	4.8.11
+KERNEL_FILE_VER:=	4.8.15
 KERNEL_RELEASE:=	1
 KERNEL_VERSION:=	$(KERNEL_FILE_VER)-$(KERNEL_RELEASE)
-KERNEL_HASH:=		cc0f42f408ba3e51f8b0e93e3d8050ff18569456d286cb2a1aca3327dd06890f
+KERNEL_HASH:=		1605260913729b7b72a64a0598b782725e365dab57d49dec188373d634538fee
 endif
 ifeq ($(ADK_TARGET_KERNEL_VERSION_4_4),y)
 KERNEL_FILE_VER:=	4.4.30
diff --git a/target/avr32/grasshopper/patches/4.8.11/0001-grasshopper.patch b/target/avr32/grasshopper/patches/4.8.15/0001-grasshopper.patch
index 0fa4535c2..0fa4535c2 100644
--- a/target/avr32/grasshopper/patches/4.8.11/0001-grasshopper.patch
+++ b/target/avr32/grasshopper/patches/4.8.15/0001-grasshopper.patch
diff --git a/target/avr32/grasshopper/patches/4.8.11/0002-grasshopper-led-pwm.patch b/target/avr32/grasshopper/patches/4.8.15/0002-grasshopper-led-pwm.patch
index 977c91523..977c91523 100644
--- a/target/avr32/grasshopper/patches/4.8.11/0002-grasshopper-led-pwm.patch
+++ b/target/avr32/grasshopper/patches/4.8.15/0002-grasshopper-led-pwm.patch
diff --git a/target/avr32/grasshopper/patches/4.8.11/0003-grasshopper-mmc.patch b/target/avr32/grasshopper/patches/4.8.15/0003-grasshopper-mmc.patch
index f87d4731b..f87d4731b 100644
--- a/target/avr32/grasshopper/patches/4.8.11/0003-grasshopper-mmc.patch
+++ b/target/avr32/grasshopper/patches/4.8.15/0003-grasshopper-mmc.patch
diff --git a/target/avr32/grasshopper/patches/4.8.11/0004-grasshopper-i2c.patch b/target/avr32/grasshopper/patches/4.8.15/0004-grasshopper-i2c.patch
index b0796ed5a..b0796ed5a 100644
--- a/target/avr32/grasshopper/patches/4.8.11/0004-grasshopper-i2c.patch
+++ b/target/avr32/grasshopper/patches/4.8.15/0004-grasshopper-i2c.patch
diff --git a/target/avr32/grasshopper/patches/4.8.11/0005-grasshopper-usart.patch b/target/avr32/grasshopper/patches/4.8.15/0005-grasshopper-usart.patch
index 448647c29..448647c29 100644
--- a/target/avr32/grasshopper/patches/4.8.11/0005-grasshopper-usart.patch
+++ b/target/avr32/grasshopper/patches/4.8.15/0005-grasshopper-usart.patch
diff --git a/target/avr32/grasshopper/patches/4.8.11/0100-netfilter-init-fix.patch b/target/avr32/grasshopper/patches/4.8.15/0100-netfilter-init-fix.patch
index 9d80e8b53..9d80e8b53 100644
--- a/target/avr32/grasshopper/patches/4.8.11/0100-netfilter-init-fix.patch
+++ b/target/avr32/grasshopper/patches/4.8.15/0100-netfilter-init-fix.patch
diff --git a/target/config/Config.in.kernelversion b/target/config/Config.in.kernelversion
index 6f999bd91..47fba887b 100644
--- a/target/config/Config.in.kernelversion
+++ b/target/config/Config.in.kernelversion
@@ -32,7 +32,7 @@ config ADK_TARGET_KERNEL_VERSION_4_9
 	depends on !ADK_TARGET_SYSTEM_QEMU_ARM_VERSATILEPB_NOMMU
 
 config ADK_TARGET_KERNEL_VERSION_4_8
-	bool "4.8.11"
+	bool "4.8.15"
 	depends on !ADK_TARGET_ARCH_CRIS
 	depends on !ADK_TARGET_ARCH_METAG
 	depends on !ADK_TARGET_ARCH_NDS32
diff --git a/target/linux/patches/4.8.11/sparc32.patch b/target/linux/patches/4.8.11/sparc32.patch
deleted file mode 100644
index b11e3b7f1..000000000
--- a/target/linux/patches/4.8.11/sparc32.patch
+++ /dev/null
@@ -1,31 +0,0 @@
-commit 07b5ab3f71d318e52c18cc3b73c1d44c908aacfa
-Author: Andreas Larsson <andreas@gaisler.com>
-Date:   Wed Nov 9 10:43:05 2016 +0100
-
-    sparc32: Fix inverted invalid_frame_pointer checks on sigreturns
-    
-    Signed-off-by: Andreas Larsson <andreas@gaisler.com>
-    Signed-off-by: David S. Miller <davem@davemloft.net>
-
-diff --git a/arch/sparc/kernel/signal_32.c b/arch/sparc/kernel/signal_32.c
-index c3c12ef..9c0c8fd 100644
---- a/arch/sparc/kernel/signal_32.c
-+++ b/arch/sparc/kernel/signal_32.c
-@@ -89,7 +89,7 @@ asmlinkage void do_sigreturn(struct pt_regs *regs)
- 	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 (invalid_frame_pointer(sf, sizeof(*sf)))
- 		goto segv_and_exit;
- 
- 	if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP]))
-@@ -150,7 +150,7 @@ asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
- 
- 	synchronize_user_stack();
- 	sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP];
--	if (!invalid_frame_pointer(sf, sizeof(*sf)))
-+	if (invalid_frame_pointer(sf, sizeof(*sf)))
- 		goto segv;
- 
- 	if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
diff --git a/target/linux/patches/4.8.11/crisv32.patch b/target/linux/patches/4.8.15/crisv32.patch
index cb9b0d028..cb9b0d028 100644
--- a/target/linux/patches/4.8.11/crisv32.patch
+++ b/target/linux/patches/4.8.15/crisv32.patch
diff --git a/target/linux/patches/4.8.11/crisv32_ethernet_driver.patch b/target/linux/patches/4.8.15/crisv32_ethernet_driver.patch
index 0cef202fc..0cef202fc 100644
--- a/target/linux/patches/4.8.11/crisv32_ethernet_driver.patch
+++ b/target/linux/patches/4.8.15/crisv32_ethernet_driver.patch
diff --git a/target/linux/patches/4.8.11/initramfs-nosizelimit.patch b/target/linux/patches/4.8.15/initramfs-nosizelimit.patch
index 40d2f6bd8..40d2f6bd8 100644
--- a/target/linux/patches/4.8.11/initramfs-nosizelimit.patch
+++ b/target/linux/patches/4.8.15/initramfs-nosizelimit.patch
diff --git a/target/linux/patches/4.8.11/ld-or1k.patch b/target/linux/patches/4.8.15/ld-or1k.patch
index 264f9166f..264f9166f 100644
--- a/target/linux/patches/4.8.11/ld-or1k.patch
+++ b/target/linux/patches/4.8.15/ld-or1k.patch
diff --git a/target/linux/patches/4.8.11/macsonic.patch b/target/linux/patches/4.8.15/macsonic.patch
index 75a6fcad2..75a6fcad2 100644
--- a/target/linux/patches/4.8.11/macsonic.patch
+++ b/target/linux/patches/4.8.15/macsonic.patch
diff --git a/target/linux/patches/4.8.11/microblaze-sigaltstack.patch b/target/linux/patches/4.8.15/microblaze-sigaltstack.patch
index c4064e8b9..c4064e8b9 100644
--- a/target/linux/patches/4.8.11/microblaze-sigaltstack.patch
+++ b/target/linux/patches/4.8.15/microblaze-sigaltstack.patch
diff --git a/target/linux/patches/4.8.11/or1k-more-ram.patch b/target/linux/patches/4.8.15/or1k-more-ram.patch
index de848c838..de848c838 100644
--- a/target/linux/patches/4.8.11/or1k-more-ram.patch
+++ b/target/linux/patches/4.8.15/or1k-more-ram.patch
diff --git a/target/linux/patches/4.8.11/patch-realtime b/target/linux/patches/4.8.15/patch-realtime
index 91b37c52f..d3a9ebee7 100644
--- a/target/linux/patches/4.8.11/patch-realtime
+++ b/target/linux/patches/4.8.15/patch-realtime
@@ -1,334 +1,6 @@
-diff --git a/Documentation/hwlat_detector.txt b/Documentation/hwlat_detector.txt
-new file mode 100644
-index 000000000000..cb61516483d3
---- /dev/null
-+++ b/Documentation/hwlat_detector.txt
-@@ -0,0 +1,64 @@
-+Introduction:
-+-------------
-+
-+The module hwlat_detector is a special purpose kernel module that is used to
-+detect large system latencies induced by the behavior of certain underlying
-+hardware or firmware, independent of Linux itself. The code was developed
-+originally to detect SMIs (System Management Interrupts) on x86 systems,
-+however there is nothing x86 specific about this patchset. It was
-+originally written for use by the "RT" patch since the Real Time
-+kernel is highly latency sensitive.
-+
-+SMIs are usually not serviced by the Linux kernel, which typically does not
-+even know that they are occuring. SMIs are instead are set up by BIOS code
-+and are serviced by BIOS code, usually for "critical" events such as
-+management of thermal sensors and fans. Sometimes though, SMIs are used for
-+other tasks and those tasks can spend an inordinate amount of time in the
-+handler (sometimes measured in milliseconds). Obviously this is a problem if
-+you are trying to keep event service latencies down in the microsecond range.
-+
-+The hardware latency detector works by hogging all of the cpus for configurable
-+amounts of time (by calling stop_machine()), polling the CPU Time Stamp Counter
-+for some period, then looking for gaps in the TSC data. Any gap indicates a
-+time when the polling was interrupted and since the machine is stopped and
-+interrupts turned off the only thing that could do that would be an SMI.
-+
-+Note that the SMI detector should *NEVER* be used in a production environment.
-+It is intended to be run manually to determine if the hardware platform has a
-+problem with long system firmware service routines.
-+
-+Usage:
-+------
-+
-+Loading the module hwlat_detector passing the parameter "enabled=1" (or by
-+setting the "enable" entry in "hwlat_detector" debugfs toggled on) is the only
-+step required to start the hwlat_detector. It is possible to redefine the
-+threshold in microseconds (us) above which latency spikes will be taken
-+into account (parameter "threshold=").
-+
-+Example:
-+
-+	# modprobe hwlat_detector enabled=1 threshold=100
-+
-+After the module is loaded, it creates a directory named "hwlat_detector" under
-+the debugfs mountpoint, "/debug/hwlat_detector" for this text. It is necessary
-+to have debugfs mounted, which might be on /sys/debug on your system.
-+
-+The /debug/hwlat_detector interface contains the following files:
-+
-+count			- number of latency spikes observed since last reset
-+enable			- a global enable/disable toggle (0/1), resets count
-+max			- maximum hardware latency actually observed (usecs)
-+sample			- a pipe from which to read current raw sample data
-+			  in the format <timestamp> <latency observed usecs>
-+			  (can be opened O_NONBLOCK for a single sample)
-+threshold		- minimum latency value to be considered (usecs)
-+width			- time period to sample with CPUs held (usecs)
-+			  must be less than the total window size (enforced)
-+window			- total period of sampling, width being inside (usecs)
-+
-+By default we will set width to 500,000 and window to 1,000,000, meaning that
-+we will sample every 1,000,000 usecs (1s) for 500,000 usecs (0.5s). If we
-+observe any latencies that exceed the threshold (initially 100 usecs),
-+then we write to a global sample ring buffer of 8K samples, which is
-+consumed by reading from the "sample" (pipe) debugfs file interface.
-diff --git a/Documentation/sysrq.txt b/Documentation/sysrq.txt
-index 3a3b30ac2a75..9e0745cafbd8 100644
---- a/Documentation/sysrq.txt
-+++ b/Documentation/sysrq.txt
-@@ -59,10 +59,17 @@ On PowerPC - Press 'ALT - Print Screen (or F13) - <command key>,
- On other - If you know of the key combos for other architectures, please
-            let me know so I can add them to this section.
- 
--On all -  write a character to /proc/sysrq-trigger.  e.g.:
--
-+On all -  write a character to /proc/sysrq-trigger, e.g.:
- 		echo t > /proc/sysrq-trigger
- 
-+On all - Enable network SysRq by writing a cookie to icmp_echo_sysrq, e.g.
-+		echo 0x01020304 >/proc/sys/net/ipv4/icmp_echo_sysrq
-+	 Send an ICMP echo request with this pattern plus the particular
-+	 SysRq command key. Example:
-+		# ping -c1 -s57 -p0102030468
-+	 will trigger the SysRq-H (help) command.
-+
-+
- *  What are the 'command' keys?
- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- 'b'     - Will immediately reboot the system without syncing or unmounting
-diff --git a/Documentation/trace/histograms.txt b/Documentation/trace/histograms.txt
-new file mode 100644
-index 000000000000..6f2aeabf7faa
---- /dev/null
-+++ b/Documentation/trace/histograms.txt
-@@ -0,0 +1,186 @@
-+		Using the Linux Kernel Latency Histograms
-+
-+
-+This document gives a short explanation how to enable, configure and use
-+latency histograms. Latency histograms are primarily relevant in the
-+context of real-time enabled kernels (CONFIG_PREEMPT/CONFIG_PREEMPT_RT)
-+and are used in the quality management of the Linux real-time
-+capabilities.
-+
-+
-+* Purpose of latency histograms
-+
-+A latency histogram continuously accumulates the frequencies of latency
-+data. There are two types of histograms
-+- potential sources of latencies
-+- effective latencies
-+
-+
-+* Potential sources of latencies
-+
-+Potential sources of latencies are code segments where interrupts,
-+preemption or both are disabled (aka critical sections). To create
-+histograms of potential sources of latency, the kernel stores the time
-+stamp at the start of a critical section, determines the time elapsed
-+when the end of the section is reached, and increments the frequency
-+counter of that latency value - irrespective of whether any concurrently
-+running process is affected by latency or not.
-+- Configuration items (in the Kernel hacking/Tracers submenu)
-+  CONFIG_INTERRUPT_OFF_LATENCY
-+  CONFIG_PREEMPT_OFF_LATENCY
-+
-+
-+* Effective latencies
-+
-+Effective latencies are actually occuring during wakeup of a process. To
-+determine effective latencies, the kernel stores the time stamp when a
-+process is scheduled to be woken up, and determines the duration of the
-+wakeup time shortly before control is passed over to this process. Note
-+that the apparent latency in user space may be somewhat longer, since the
-+process may be interrupted after control is passed over to it but before
-+the execution in user space takes place. Simply measuring the interval
-+between enqueuing and wakeup may also not appropriate in cases when a
-+process is scheduled as a result of a timer expiration. The timer may have
-+missed its deadline, e.g. due to disabled interrupts, but this latency
-+would not be registered. Therefore, the offsets of missed timers are
-+recorded in a separate histogram. If both wakeup latency and missed timer
-+offsets are configured and enabled, a third histogram may be enabled that
-+records the overall latency as a sum of the timer latency, if any, and the
-+wakeup latency. This histogram is called "timerandwakeup".
-+- Configuration items (in the Kernel hacking/Tracers submenu)
-+  CONFIG_WAKEUP_LATENCY
-+  CONFIG_MISSED_TIMER_OFSETS
-+
-+
-+* Usage
-+
-+The interface to the administration of the latency histograms is located
-+in the debugfs file system. To mount it, either enter
-+
-+mount -t sysfs nodev /sys
-+mount -t debugfs nodev /sys/kernel/debug
-+
-+from shell command line level, or add
-+
-+nodev	/sys			sysfs	defaults	0 0
-+nodev	/sys/kernel/debug	debugfs	defaults	0 0
-+
-+to the file /etc/fstab. All latency histogram related files are then
-+available in the directory /sys/kernel/debug/tracing/latency_hist. A
-+particular histogram type is enabled by writing non-zero to the related
-+variable in the /sys/kernel/debug/tracing/latency_hist/enable directory.
-+Select "preemptirqsoff" for the histograms of potential sources of
-+latencies and "wakeup" for histograms of effective latencies etc. The
-+histogram data - one per CPU - are available in the files
-+
-+/sys/kernel/debug/tracing/latency_hist/preemptoff/CPUx
-+/sys/kernel/debug/tracing/latency_hist/irqsoff/CPUx
-+/sys/kernel/debug/tracing/latency_hist/preemptirqsoff/CPUx
-+/sys/kernel/debug/tracing/latency_hist/wakeup/CPUx
-+/sys/kernel/debug/tracing/latency_hist/wakeup/sharedprio/CPUx
-+/sys/kernel/debug/tracing/latency_hist/missed_timer_offsets/CPUx
-+/sys/kernel/debug/tracing/latency_hist/timerandwakeup/CPUx
-+
-+The histograms are reset by writing non-zero to the file "reset" in a
-+particular latency directory. To reset all latency data, use
-+
-+#!/bin/sh
-+
-+TRACINGDIR=/sys/kernel/debug/tracing
-+HISTDIR=$TRACINGDIR/latency_hist
-+
-+if test -d $HISTDIR
-+then
-+  cd $HISTDIR
-+  for i in `find . | grep /reset$`
-+  do
-+    echo 1 >$i
-+  done
-+fi
-+
-+
-+* Data format
-+
-+Latency data are stored with a resolution of one microsecond. The
-+maximum latency is 10,240 microseconds. The data are only valid, if the
-+overflow register is empty. Every output line contains the latency in
-+microseconds in the first row and the number of samples in the second
-+row. To display only lines with a positive latency count, use, for
-+example,
-+
-+grep -v " 0$" /sys/kernel/debug/tracing/latency_hist/preemptoff/CPU0
-+
-+#Minimum latency: 0 microseconds.
-+#Average latency: 0 microseconds.
-+#Maximum latency: 25 microseconds.
-+#Total samples: 3104770694
-+#There are 0 samples greater or equal than 10240 microseconds
-+#usecs	         samples
-+    0	      2984486876
-+    1	        49843506
-+    2	        58219047
-+    3	         5348126
-+    4	         2187960
-+    5	         3388262
-+    6	          959289
-+    7	          208294
-+    8	           40420
-+    9	            4485
-+   10	           14918
-+   11	           18340
-+   12	           25052
-+   13	           19455
-+   14	            5602
-+   15	             969
-+   16	              47
-+   17	              18
-+   18	              14
-+   19	               1
-+   20	               3
-+   21	               2
-+   22	               5
-+   23	               2
-+   25	               1
-+
-+
-+* Wakeup latency of a selected process
-+
-+To only collect wakeup latency data of a particular process, write the
-+PID of the requested process to
-+
-+/sys/kernel/debug/tracing/latency_hist/wakeup/pid
-+
-+PIDs are not considered, if this variable is set to 0.
-+
-+
-+* Details of the process with the highest wakeup latency so far
-+
-+Selected data of the process that suffered from the highest wakeup
-+latency that occurred in a particular CPU are available in the file
-+
-+/sys/kernel/debug/tracing/latency_hist/wakeup/max_latency-CPUx.
-+
-+In addition, other relevant system data at the time when the
-+latency occurred are given.
-+
-+The format of the data is (all in one line):
-+<PID> <Priority> <Latency> (<Timeroffset>) <Command> \
-+<- <PID> <Priority> <Command> <Timestamp>
-+
-+The value of <Timeroffset> is only relevant in the combined timer
-+and wakeup latency recording. In the wakeup recording, it is
-+always 0, in the missed_timer_offsets recording, it is the same
-+as <Latency>.
-+
-+When retrospectively searching for the origin of a latency and
-+tracing was not enabled, it may be helpful to know the name and
-+some basic data of the task that (finally) was switching to the
-+late real-tlme task. In addition to the victim's data, also the
-+data of the possible culprit are therefore displayed after the
-+"<-" symbol.
-+
-+Finally, the timestamp of the time when the latency occurred
-+in <seconds>.<microseconds> after the most recent system boot
-+is provided.
-+
-+These data are also reset when the wakeup histogram is reset.
-diff --git a/arch/Kconfig b/arch/Kconfig
-index fd6e9712af81..085134ee13e9 100644
---- a/arch/Kconfig
-+++ b/arch/Kconfig
-@@ -9,6 +9,7 @@ config OPROFILE
- 	tristate "OProfile system profiling"
- 	depends on PROFILING
- 	depends on HAVE_OPROFILE
-+	depends on !PREEMPT_RT_FULL
- 	select RING_BUFFER
- 	select RING_BUFFER_ALLOW_SWAP
- 	help
-@@ -52,6 +53,7 @@ config KPROBES
- config JUMP_LABEL
-        bool "Optimize very unlikely/likely branches"
-        depends on HAVE_ARCH_JUMP_LABEL
-+       depends on (!INTERRUPT_OFF_HIST && !PREEMPT_OFF_HIST && !WAKEUP_LATENCY_HIST && !MISSED_TIMER_OFFSETS_HIST)
-        help
-          This option enables a transparent branch optimization that
- 	 makes certain almost-always-true or almost-always-false branch
-diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
-index a9c4e48bb7ec..6eefe4f32302 100644
---- a/arch/arm/Kconfig
-+++ b/arch/arm/Kconfig
-@@ -36,7 +36,7 @@ config ARM
- 	select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
- 	select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
- 	select HAVE_ARCH_HARDENED_USERCOPY
--	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)
-@@ -75,6 +75,7 @@ config ARM
- 	select HAVE_PERF_EVENTS
- 	select HAVE_PERF_REGS
- 	select HAVE_PERF_USER_STACK_DUMP
-+	select HAVE_PREEMPT_LAZY
- 	select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
- 	select HAVE_REGS_AND_STACK_ACCESS_API
- 	select HAVE_SYSCALL_TRACEPOINTS
-diff --git a/arch/arm/include/asm/switch_to.h b/arch/arm/include/asm/switch_to.h
-index 12ebfcc1d539..c962084605bc 100644
---- a/arch/arm/include/asm/switch_to.h
-+++ b/arch/arm/include/asm/switch_to.h
+diff -Nur linux-4.8.15.orig/arch/arm/include/asm/switch_to.h linux-4.8.15/arch/arm/include/asm/switch_to.h
+--- linux-4.8.15.orig/arch/arm/include/asm/switch_to.h	2016-12-15 17:50:48.000000000 +0100
++++ linux-4.8.15/arch/arm/include/asm/switch_to.h	2017-01-01 17:07:11.543137886 +0100
 @@ -3,6 +3,13 @@
  
  #include <linux/thread_info.h>
@@ -343,7 +15,7 @@ index 12ebfcc1d539..c962084605bc 100644
  /*
   * For v7 SMP cores running a preemptible kernel we may be pre-empted
   * during a TLB maintenance operation, so execute an inner-shareable dsb
-@@ -25,6 +32,7 @@ extern struct task_struct *__switch_to(struct task_struct *, struct thread_info
+@@ -25,6 +32,7 @@
  #define switch_to(prev,next,last)					\
  do {									\
  	__complete_pending_tlbi();					\
@@ -351,11 +23,10 @@ index 12ebfcc1d539..c962084605bc 100644
  	last = __switch_to(prev,task_thread_info(prev), task_thread_info(next));	\
  } while (0)
  
-diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h
-index 776757d1604a..1f36a4eccc72 100644
---- a/arch/arm/include/asm/thread_info.h
-+++ b/arch/arm/include/asm/thread_info.h
-@@ -49,6 +49,7 @@ struct cpu_context_save {
+diff -Nur linux-4.8.15.orig/arch/arm/include/asm/thread_info.h linux-4.8.15/arch/arm/include/asm/thread_info.h
+--- linux-4.8.15.orig/arch/arm/include/asm/thread_info.h	2016-12-15 17:50:48.000000000 +0100
++++ linux-4.8.15/arch/arm/include/asm/thread_info.h	2017-01-01 17:07:11.547138137 +0100
+@@ -49,6 +49,7 @@
  struct thread_info {
  	unsigned long		flags;		/* low level flags */
  	int			preempt_count;	/* 0 => preemptable, <0 => bug */
@@ -363,7 +34,7 @@ index 776757d1604a..1f36a4eccc72 100644
  	mm_segment_t		addr_limit;	/* address limit */
  	struct task_struct	*task;		/* main task structure */
  	__u32			cpu;		/* cpu */
-@@ -142,7 +143,8 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *,
+@@ -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 */
@@ -373,7 +44,7 @@ index 776757d1604a..1f36a4eccc72 100644
  
  #define TIF_NOHZ		12	/* in adaptive nohz mode */
  #define TIF_USING_IWMMXT	17
-@@ -152,6 +154,7 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *,
+@@ -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)
@@ -381,7 +52,7 @@ index 776757d1604a..1f36a4eccc72 100644
  #define _TIF_UPROBE		(1 << TIF_UPROBE)
  #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
  #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
-@@ -167,7 +170,8 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *,
+@@ -167,7 +170,8 @@
   * Change these and you break ASM code in entry-common.S
   */
  #define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
@@ -391,11 +62,30 @@ index 776757d1604a..1f36a4eccc72 100644
  
  #endif /* __KERNEL__ */
  #endif /* __ASM_ARM_THREAD_INFO_H */
-diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
-index 608008229c7d..3866da3f7bb7 100644
---- a/arch/arm/kernel/asm-offsets.c
-+++ b/arch/arm/kernel/asm-offsets.c
-@@ -65,6 +65,7 @@ int main(void)
+diff -Nur linux-4.8.15.orig/arch/arm/Kconfig linux-4.8.15/arch/arm/Kconfig
+--- linux-4.8.15.orig/arch/arm/Kconfig	2016-12-15 17:50:48.000000000 +0100
++++ linux-4.8.15/arch/arm/Kconfig	2017-01-01 17:07:11.487134269 +0100
+@@ -36,7 +36,7 @@
+ 	select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
+ 	select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
+ 	select HAVE_ARCH_HARDENED_USERCOPY
+-	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)
+@@ -75,6 +75,7 @@
+ 	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-4.8.15.orig/arch/arm/kernel/asm-offsets.c linux-4.8.15/arch/arm/kernel/asm-offsets.c
+--- linux-4.8.15.orig/arch/arm/kernel/asm-offsets.c	2016-12-15 17:50:48.000000000 +0100
++++ linux-4.8.15/arch/arm/kernel/asm-offsets.c	2017-01-01 17:07:11.587140711 +0100
+@@ -65,6 +65,7 @@
    BLANK();
    DEFINE(TI_FLAGS,		offsetof(struct thread_info, flags));
    DEFINE(TI_PREEMPT,		offsetof(struct thread_info, preempt_count));
@@ -403,11 +93,10 @@ index 608008229c7d..3866da3f7bb7 100644
    DEFINE(TI_ADDR_LIMIT,		offsetof(struct thread_info, addr_limit));
    DEFINE(TI_TASK,		offsetof(struct thread_info, task));
    DEFINE(TI_CPU,		offsetof(struct thread_info, cpu));
-diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
-index 9f157e7c51e7..468e224d76aa 100644
---- a/arch/arm/kernel/entry-armv.S
-+++ b/arch/arm/kernel/entry-armv.S
-@@ -220,11 +220,18 @@ ENDPROC(__dabt_svc)
+diff -Nur linux-4.8.15.orig/arch/arm/kernel/entry-armv.S linux-4.8.15/arch/arm/kernel/entry-armv.S
+--- linux-4.8.15.orig/arch/arm/kernel/entry-armv.S	2016-12-15 17:50:48.000000000 +0100
++++ linux-4.8.15/arch/arm/kernel/entry-armv.S	2017-01-01 17:07:11.611142259 +0100
+@@ -220,11 +220,18 @@
  
  #ifdef CONFIG_PREEMPT
  	ldr	r8, [tsk, #TI_PREEMPT]		@ get preempt count
@@ -428,7 +117,7 @@ index 9f157e7c51e7..468e224d76aa 100644
  #endif
  
  	svc_exit r5, irq = 1			@ return from exception
-@@ -239,8 +246,14 @@ ENDPROC(__irq_svc)
+@@ -239,8 +246,14 @@
  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
@@ -444,10 +133,9 @@ index 9f157e7c51e7..468e224d76aa 100644
  #endif
  
  __und_fault:
-diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
-index 10c3283d6c19..8872937862cc 100644
---- a/arch/arm/kernel/entry-common.S
-+++ b/arch/arm/kernel/entry-common.S
+diff -Nur linux-4.8.15.orig/arch/arm/kernel/entry-common.S linux-4.8.15/arch/arm/kernel/entry-common.S
+--- linux-4.8.15.orig/arch/arm/kernel/entry-common.S	2016-12-15 17:50:48.000000000 +0100
++++ linux-4.8.15/arch/arm/kernel/entry-common.S	2017-01-01 17:07:11.615142513 +0100
 @@ -36,7 +36,9 @@
   UNWIND(.cantunwind	)
  	disable_irq_notrace			@ disable interrupts
@@ -459,7 +147,7 @@ index 10c3283d6c19..8872937862cc 100644
  	bne	fast_work_pending
  
  	/* perform architecture specific actions before user return */
-@@ -62,8 +64,11 @@ ENDPROC(ret_fast_syscall)
+@@ -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
@@ -472,11 +160,40 @@ index 10c3283d6c19..8872937862cc 100644
   UNWIND(.fnend		)
  ENDPROC(ret_fast_syscall)
  
-diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
-index 612eb530f33f..cd3006dc1fd3 100644
---- a/arch/arm/kernel/process.c
-+++ b/arch/arm/kernel/process.c
-@@ -323,6 +323,30 @@ unsigned long arch_randomize_brk(struct mm_struct *mm)
+diff -Nur linux-4.8.15.orig/arch/arm/kernel/patch.c linux-4.8.15/arch/arm/kernel/patch.c
+--- linux-4.8.15.orig/arch/arm/kernel/patch.c	2016-12-15 17:50:48.000000000 +0100
++++ linux-4.8.15/arch/arm/kernel/patch.c	2017-01-01 17:07:11.623143039 +0100
+@@ -15,7 +15,7 @@
+ 	unsigned int insn;
+ };
+ 
+-static DEFINE_SPINLOCK(patch_lock);
++static DEFINE_RAW_SPINLOCK(patch_lock);
+ 
+ static void __kprobes *patch_map(void *addr, int fixmap, unsigned long *flags)
+ 	__acquires(&patch_lock)
+@@ -32,7 +32,7 @@
+ 		return addr;
+ 
+ 	if (flags)
+-		spin_lock_irqsave(&patch_lock, *flags);
++		raw_spin_lock_irqsave(&patch_lock, *flags);
+ 	else
+ 		__acquire(&patch_lock);
+ 
+@@ -47,7 +47,7 @@
+ 	clear_fixmap(fixmap);
+ 
+ 	if (flags)
+-		spin_unlock_irqrestore(&patch_lock, *flags);
++		raw_spin_unlock_irqrestore(&patch_lock, *flags);
+ 	else
+ 		__release(&patch_lock);
+ }
+diff -Nur linux-4.8.15.orig/arch/arm/kernel/process.c linux-4.8.15/arch/arm/kernel/process.c
+--- linux-4.8.15.orig/arch/arm/kernel/process.c	2016-12-15 17:50:48.000000000 +0100
++++ linux-4.8.15/arch/arm/kernel/process.c	2017-01-01 17:07:11.631143548 +0100
+@@ -323,6 +323,30 @@
  }
  
  #ifdef CONFIG_MMU
@@ -507,11 +224,10 @@ index 612eb530f33f..cd3006dc1fd3 100644
  #ifdef CONFIG_KUSER_HELPERS
  /*
   * The vectors page is always readable from user space for the
-diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
-index 7b8f2141427b..96541e00b74a 100644
---- a/arch/arm/kernel/signal.c
-+++ b/arch/arm/kernel/signal.c
-@@ -572,7 +572,8 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall)
+diff -Nur linux-4.8.15.orig/arch/arm/kernel/signal.c linux-4.8.15/arch/arm/kernel/signal.c
+--- linux-4.8.15.orig/arch/arm/kernel/signal.c	2016-12-15 17:50:48.000000000 +0100
++++ linux-4.8.15/arch/arm/kernel/signal.c	2017-01-01 17:07:11.659145353 +0100
+@@ -572,7 +572,8 @@
  	 */
  	trace_hardirqs_off();
  	do {
@@ -521,11 +237,10 @@ index 7b8f2141427b..96541e00b74a 100644
  			schedule();
  		} else {
  			if (unlikely(!user_mode(regs)))
-diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
-index 861521606c6d..e5ca865d321b 100644
---- a/arch/arm/kernel/smp.c
-+++ b/arch/arm/kernel/smp.c
-@@ -234,8 +234,6 @@ int __cpu_disable(void)
+diff -Nur linux-4.8.15.orig/arch/arm/kernel/smp.c linux-4.8.15/arch/arm/kernel/smp.c
+--- linux-4.8.15.orig/arch/arm/kernel/smp.c	2016-12-15 17:50:48.000000000 +0100
++++ linux-4.8.15/arch/arm/kernel/smp.c	2017-01-01 17:07:11.671146131 +0100
+@@ -234,8 +234,6 @@
  	flush_cache_louis();
  	local_flush_tlb_all();
  
@@ -534,7 +249,7 @@ index 861521606c6d..e5ca865d321b 100644
  	return 0;
  }
  
-@@ -251,6 +249,9 @@ void __cpu_die(unsigned int cpu)
+@@ -251,6 +249,9 @@
  		pr_err("CPU%u: cpu didn't die\n", cpu);
  		return;
  	}
@@ -544,11 +259,10 @@ index 861521606c6d..e5ca865d321b 100644
  	pr_notice("CPU%u: shutdown\n", cpu);
  
  	/*
-diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c
-index 0bee233fef9a..314cfb232a63 100644
---- a/arch/arm/kernel/unwind.c
-+++ b/arch/arm/kernel/unwind.c
-@@ -93,7 +93,7 @@ extern const struct unwind_idx __start_unwind_idx[];
+diff -Nur linux-4.8.15.orig/arch/arm/kernel/unwind.c linux-4.8.15/arch/arm/kernel/unwind.c
+--- linux-4.8.15.orig/arch/arm/kernel/unwind.c	2016-12-15 17:50:48.000000000 +0100
++++ linux-4.8.15/arch/arm/kernel/unwind.c	2017-01-01 17:07:11.671146131 +0100
+@@ -93,7 +93,7 @@
  static const struct unwind_idx *__origin_unwind_idx;
  extern const struct unwind_idx __stop_unwind_idx[];
  
@@ -557,7 +271,7 @@ index 0bee233fef9a..314cfb232a63 100644