linux-kernel - [PATCH] sched/core: use list_is_singular in sched_can_stop

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Message-Id: <a5453fafd735affcf28e53a1d0a3d6965cb5dbb5.1447582547.git.geliangtang@163.com>
Date:	Sun, 15 Nov 2015 18:18:40 +0800
From:	Geliang Tang <geliangtang@....com>
To:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	Geliang Tang <geliangtang@....com>, linux-kernel@...r.kernel.org
Subject: [PATCH] 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@....com>
---
 kernel/sched/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 4d568ac..abb7c32 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);
 	}
 
 	/*
-- 
2.5.0


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