linux-kernel - [tip:sched/core] sched/wait: Collapse __wait_event

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Message-ID: <tip-ebdc195f2ec68576876216081035293e37318e86@git.kernel.org>
Date:	Fri, 4 Oct 2013 10:35:47 -0700
From:	tip-bot for Peter Zijlstra <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, oleg@...hat.com, tglx@...utronix.de
Subject: [tip:sched/core] sched/wait: Collapse __wait_event_hrtimeout()

Commit-ID:  ebdc195f2ec68576876216081035293e37318e86
Gitweb:     http://git.kernel.org/tip/ebdc195f2ec68576876216081035293e37318e86
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Wed, 2 Oct 2013 11:22:32 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 4 Oct 2013 10:16:22 +0200

sched/wait: Collapse __wait_event_hrtimeout()

While not a whole-sale replacement like the others we can still reduce
the size of __wait_event_hrtimeout() considerably by noting that the
actual core of __wait_event_hrtimeout() is identical to what
___wait_event() generates.

Reviewed-by: Oleg Nesterov <oleg@...hat.com>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20131002092528.972793648@infradead.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/wait.h | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/include/linux/wait.h b/include/linux/wait.h
index ec3683e..c065e8a 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -337,7 +337,6 @@ do {									\
 #define __wait_event_hrtimeout(wq, condition, timeout, state)		\
 ({									\
 	int __ret = 0;							\
-	DEFINE_WAIT(__wait);						\
 	struct hrtimer_sleeper __t;					\
 									\
 	hrtimer_init_on_stack(&__t.timer, CLOCK_MONOTONIC,		\
@@ -348,25 +347,15 @@ do {									\
 				       current->timer_slack_ns,		\
 				       HRTIMER_MODE_REL);		\
 									\
-	for (;;) {							\
-		prepare_to_wait(&wq, &__wait, state);			\
-		if (condition)						\
-			break;						\
-		if (state == TASK_INTERRUPTIBLE &&			\
-		    signal_pending(current)) {				\
-			__ret = -ERESTARTSYS;				\
-			break;						\
-		}							\
+	___wait_event(wq, condition, state, 0, __ret,			\
 		if (!__t.task) {					\
 			__ret = -ETIME;					\
 			break;						\
 		}							\
-		schedule();						\
-	}								\
+		schedule());						\
 									\
 	hrtimer_cancel(&__t.timer);					\
 	destroy_hrtimer_on_stack(&__t.timer);				\
-	finish_wait(&wq, &__wait);					\
 	__ret;								\
 })
 
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