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[PATCH RT 08/17] kernel: migrate_disable() do fastpath in atomic & irqs-off

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3.14.61-rt64-rc1 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

With interrupts off it makes no sense to do the long path since we can't
leave the CPU anyway. Also we might end up in a recursion with lockdep.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 kernel/sched/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 157ef7f121fb..79b68804a4a8 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2698,7 +2698,7 @@ void migrate_disable(void)
 {
 	struct task_struct *p = current;
 
-	if (in_atomic()) {
+	if (in_atomic() || irqs_disabled()) {
 #ifdef CONFIG_SCHED_DEBUG
 		p->migrate_disable_atomic++;
 #endif
@@ -2732,7 +2732,7 @@ void migrate_enable(void)
 	unsigned long flags;
 	struct rq *rq;
 
-	if (in_atomic()) {
+	if (in_atomic() || irqs_disabled()) {
 #ifdef CONFIG_SCHED_DEBUG
 		p->migrate_disable_atomic--;
 #endif
-- 
2.7.0

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[PATCH RT 00/17] Linux 3.14.61-rt64-rc1 Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 16:50 +0100
  [PATCH RT 04/17] softirq: split timer softirqs out of ksoftirqd Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 16:50 +0100
  [PATCH RT 08/17] kernel: migrate_disable() do fastpath in atomic & irqs-off Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 16:50 +0100
  [PATCH RT 06/17] latencyhist: disable jump-labels Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 16:50 +0100
  [PATCH RT 10/17] kernel/stop_machine: partly revert "stop_machine: Use raw spinlocks" Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 16:50 +0100
  [PATCH RT 14/17] f2fs: Mutex cant be used by down_write_nest_lock() Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 16:50 +0100
  [PATCH RT 01/17] ptrace: dont open IRQs in ptrace_freeze_traced() too early Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 16:50 +0100
  [PATCH RT 15/17] rcu/torture: Comment out rcu_bh ops on PREEMPT_RT_FULL Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 16:50 +0100
  [PATCH RT 09/17] kernel: softirq: unlock with irqs on Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 16:50 +0100
  [PATCH RT 05/17] net: provide a way to delegate processing a softirq to ksoftirqd Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 16:50 +0100
  [PATCH RT 03/17] preempt-lazy: Add the lazy-preemption check to preempt_schedule() Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 17:00 +0100
  [PATCH RT 11/17] sched,rt: __always_inline preemptible_lazy() Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 17:10 +0100
  [PATCH RT 02/17] net: move xmit_recursion to per-task variable on -RT Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 17:10 +0100
  [PATCH RT 13/17] trace: Use rcuidle version for preemptoff_hist trace point Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 17:10 +0100
  [PATCH RT 12/17] drm,radeon,i915: Use preempt_disable/enable_rt() where recommended Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 17:10 +0100
  [PATCH RT 16/17] kernel: sched: Fix preempt_disable_ip recodring for preempt_disable() Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 17:10 +0100
  [PATCH RT 07/17] arm64: replace read_lock to rcu lock in call_step_hook Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 17:10 +0100
    Re: [PATCH RT 07/17] arm64: replace read_lock to rcu lock in  call_step_hook Pratyush Anand <panand@redhat.com> - 2016-03-03 05:30 +0100
      Re: [PATCH RT 07/17] arm64: replace read_lock to rcu lock in  call_step_hook Steven Rostedt <rostedt@goodmis.org> - 2016-03-03 15:20 +0100
        Re: [PATCH RT 07/17] arm64: replace read_lock to rcu lock in  call_step_hook Steven Rostedt <rostedt@goodmis.org> - 2016-03-03 15:30 +0100
  [PATCH RT 17/17] Linux 3.14.61-rt64-rc1 Steven Rostedt <rostedt@goodmis.org> - 2016-03-02 17:10 +0100

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