[RFC PATCH 4/4] sched: Consolidate open coded preemptible() checks

[Frederic Weisbecker <fweisbec@gmail.com>]

preempt_schedule() and preempt_schedule_context() open
code their preemptability checks.

Use the standard API instead for consolidation.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Alex Shi <alex.shi@intel.com>
Cc: Paul Turner <pjt@google.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
---
 kernel/context_tracking.c |    3 +--
 kernel/sched/core.c       |    4 +---
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index 6667700..08db730 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -88,10 +88,9 @@ void user_enter(void)
  */
 void __sched notrace preempt_schedule_context(void)
 {
-	struct thread_info *ti = current_thread_info();
 	enum ctx_state prev_ctx;
 
-	if (likely(ti->preempt_count || irqs_disabled()))
+	if (likely(!preemptible()))
 		return;
 
 	/*
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index ceeaf0f..f38d0be 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2515,13 +2515,11 @@ void __sched schedule_preempt_disabled(void)
  */
 asmlinkage void __sched notrace preempt_schedule(void)
 {
-	struct thread_info *ti = current_thread_info();
-
 	/*
 	 * If there is a non-zero preempt_count or interrupts are disabled,
 	 * we do not want to preempt the current task. Just return..
 	 */
-	if (likely(ti->preempt_count || irqs_disabled()))
+	if (likely(!preemptible()))
 		return;
 
 	do {
-- 
1.7.5.4