Merge tag 'v4.1.5-rt5-lno1' of git://git.linaro.org/people/anders.roxell/linux-rt into linux-linaro-lsk-v4.1-rtlsk-v4.1-15.08-rt

Linux 4.1.5-rt5

Changes since v4.1.3-rt3
- don't disable preemption in dump_stack(). We should not see a
  backtrace on a production kernel but then it should not increase the
  latency if trigger one.

* tag 'v4.1.5-rt5-lno1' of git://git.linaro.org/people/anders.roxell/linux-rt: (270 commits)
  localversion: Add RT specific localversion file
  workqueue: Prevent deadlock/stall on RT
  md: disable bcache
  rt,ntp: Move call to schedule_delayed_work() to helper thread
  memcontrol: Prevent scheduling while atomic in cgroup code
  cgroups: use simple wait in css_release()
  i915: bogus warning from i915 when running on PREEMPT_RT
  drm/i915: drop trace_i915_gem_ring_dispatch on rt
  gpu/i915: don't open code these things
  cpufreq: drop K8's driver from beeing selected
  mmc: sdhci: don't provide hard irq handler
  mmci: Remove bogus local_irq_save()
  i2c/omap: drop the lock hard irq context
  leds: trigger: disable CPU trigger on -RT
  arch/arm64: Add lazy preempt support
  powerpc: Add support for lazy preemption
  arm: Add support for lazy preemption
  x86: Support for lazy preemption
  sched: Add support for lazy preemption
  rcu: make RCU_BOOST default on RT
  ...

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/dump_stack.c b/lib/dump_stack.c
index 6745c6230db3..7ccbc6ff80ea 100644
--- a/lib/dump_stack.c
+++ b/lib/dump_stack.c
@@ -33,7 +33,7 @@ asmlinkage __visible void dump_stack(void)
 	 * Permit this cpu to perform nested stack dumps while serialising
 	 * against other CPUs
 	 */
-	preempt_disable();
+	migrate_disable();
 
 retry:
 	cpu = smp_processor_id();
@@ -52,7 +52,7 @@ retry:
 	if (!was_locked)
 		atomic_set(&dump_lock, -1);
 
-	preempt_enable();
+	migrate_enable();
 }
 #else
 asmlinkage __visible void dump_stack(void)