From: liguang <lig.fnst@cn.fujitsu.com>
Date: Tue, 30 Apr 2013 22:28:32 +0000 (-0700)
Subject: semaphore: use unlikely() for down's timeout
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c74f66ce102e2cfb61c185f7451538e29de640b9;p=linux.git

semaphore: use unlikely() for down's timeout

Signed-off-by: liguang <lig.fnst@cn.fujitsu.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/kernel/semaphore.c b/kernel/semaphore.c
index 4567fc020fe34..9c7017d1d9969 100644
--- a/kernel/semaphore.c
+++ b/kernel/semaphore.c
@@ -214,7 +214,7 @@ static inline int __sched __down_common(struct semaphore *sem, long state,
 	for (;;) {
 		if (signal_pending_state(state, task))
 			goto interrupted;
-		if (timeout <= 0)
+		if (unlikely(timeout <= 0))
 			goto timed_out;
 		__set_task_state(task, state);
 		raw_spin_unlock_irq(&sem->lock);