linux-kernel - [tip:locking/core] locking/mutexes: Standardize arguments in lock /unlock slowpaths

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Message-ID: <tip-242489cfe97d44290e7f88b12591fab6c0819045@git.kernel.org>
Date:	Wed, 13 Aug 2014 03:54:53 -0700
From:	tip-bot for Davidlohr Bueso <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	torvalds@...ux-foundation.org, peterz@...radead.org,
	tglx@...utronix.de, davidlohr@...com
Subject: [tip:locking/core] locking/mutexes: Standardize arguments in lock
 /unlock slowpaths

Commit-ID:  242489cfe97d44290e7f88b12591fab6c0819045
Gitweb:     http://git.kernel.org/tip/242489cfe97d44290e7f88b12591fab6c0819045
Author:     Davidlohr Bueso <davidlohr@...com>
AuthorDate: Wed, 30 Jul 2014 13:41:50 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 13 Aug 2014 10:31:58 +0200

locking/mutexes: Standardize arguments in lock/unlock slowpaths

Just how the locking-end behaves, when unlocking, go ahead and
obtain the proper data structure immediately after the previous
(asm-end) call exits and there are (probably) pending waiters.
This simplifies a bit some of the layering.

Signed-off-by: Davidlohr Bueso <davidlohr@...com>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Cc: jason.low2@...com
Cc: aswin@...com
Cc: mingo@...nel.org
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org
Link: http://lkml.kernel.org/r/1406752916-3341-1-git-send-email-davidlohr@hp.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/locking/mutex.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c
index ae712b2..ad0e333 100644
--- a/kernel/locking/mutex.c
+++ b/kernel/locking/mutex.c
@@ -679,9 +679,8 @@ EXPORT_SYMBOL_GPL(__ww_mutex_lock_interruptible);
  * Release the lock, slowpath:
  */
 static inline void
-__mutex_unlock_common_slowpath(atomic_t *lock_count, int nested)
+__mutex_unlock_common_slowpath(struct mutex *lock, int nested)
 {
-	struct mutex *lock = container_of(lock_count, struct mutex, count);
 	unsigned long flags;
 
 	/*
@@ -716,7 +715,9 @@ __mutex_unlock_common_slowpath(atomic_t *lock_count, int nested)
 __visible void
 __mutex_unlock_slowpath(atomic_t *lock_count)
 {
-	__mutex_unlock_common_slowpath(lock_count, 1);
+	struct mutex *lock = container_of(lock_count, struct mutex, count);
+
+	__mutex_unlock_common_slowpath(lock, 1);
 }
 
 #ifndef CONFIG_DEBUG_LOCK_ALLOC
--
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