From: Geliang Tang <geliangtang@163.com>
Date: Sun, 15 Nov 2015 10:18:40 +0000 (+0800)
Subject: sched/core: Use list_is_singular() in sched_can_stop_tick()
X-Git-Tag: v4.14-rc1~4088^2~26
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=01783e0d452736d7deff1b920c5eccad67adc428;p=platform%2Fkernel%2Flinux-rpi.git

sched/core: Use list_is_singular() in sched_can_stop_tick()

Use list_is_singular() to check if run_list has only one entry.

Signed-off-by: Geliang Tang <geliangtang@163.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/a5453fafd735affcf28e53a1d0a3d6965cb5dbb5.1447582547.git.geliangtang@163.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 1b7cb5e..5b420d2 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -731,7 +731,7 @@ bool sched_can_stop_tick(void)
 	if (current->policy == SCHED_RR) {
 		struct sched_rt_entity *rt_se = &current->rt;
 
-		return rt_se->run_list.prev == rt_se->run_list.next;
+		return list_is_singular(&rt_se->run_list);
 	}
 
 	/*