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

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Date:	Fri, 4 Oct 2013 10:35:08 -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_interruptible_lock_irq()

Commit-ID:  8fbd88fa1717601ef91ced49a32f24786b167065
Gitweb:     http://git.kernel.org/tip/8fbd88fa1717601ef91ced49a32f24786b167065
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Wed, 2 Oct 2013 11:22:28 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 4 Oct 2013 10:16:19 +0200

sched/wait: Collapse __wait_event_interruptible_lock_irq()

Reduce macro complexity by using the new ___wait_event() helper.
No change in behaviour, identical generated code.

Reviewed-by: Oleg Nesterov <oleg@...hat.com>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20131002092528.686006009@infradead.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/wait.h | 26 ++++++--------------------
 1 file changed, 6 insertions(+), 20 deletions(-)

diff --git a/include/linux/wait.h b/include/linux/wait.h
index d64918e..a577a85 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -689,26 +689,12 @@ do {									\
 } while (0)
 
 
-#define __wait_event_interruptible_lock_irq(wq, condition,		\
-					    lock, ret, cmd)		\
-do {									\
-	DEFINE_WAIT(__wait);						\
-									\
-	for (;;) {							\
-		prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);	\
-		if (condition)						\
-			break;						\
-		if (signal_pending(current)) {				\
-			ret = -ERESTARTSYS;				\
-			break;						\
-		}							\
-		spin_unlock_irq(&lock);					\
-		cmd;							\
-		schedule();						\
-		spin_lock_irq(&lock);					\
-	}								\
-	finish_wait(&wq, &__wait);					\
-} while (0)
+#define __wait_event_interruptible_lock_irq(wq, condition, lock, ret, cmd) \
+	___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, ret,	   \
+		      spin_unlock_irq(&lock);				   \
+		      cmd;						   \
+		      schedule();					   \
+		      spin_lock_irq(&lock))
 
 /**
  * wait_event_interruptible_lock_irq_cmd - sleep until a condition gets true.
--
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