linux-kernel - [PATCH v6 5/5] qrwlock: Use smp_store_release() in write

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Message-Id: <1384267735-43213-7-git-send-email-Waiman.Long@hp.com>
Date:	Tue, 12 Nov 2013 09:48:55 -0500
From:	Waiman Long <Waiman.Long@...com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>
Cc:	linux-arch@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michel Lespinasse <walken@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Rik van Riel <riel@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	George Spelvin <linux@...izon.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	"Aswin Chandramouleeswaran\"" <aswin@...com>,
	Scott J Norton <scott.norton@...com>,
	Waiman Long <Waiman.Long@...com>
Subject: [PATCH v6 5/5] qrwlock: Use smp_store_release() in write_unlock()

This patch modifies the queue_write_unlock() function to use the
new smp_store_release() function in another pending patch. This patch
should only be merged if the other patch was merged.

Signed-off-by: Waiman Long <Waiman.Long@...com>
---
 include/asm-generic/qrwlock.h |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/include/asm-generic/qrwlock.h b/include/asm-generic/qrwlock.h
index 288fb00..479c142 100644
--- a/include/asm-generic/qrwlock.h
+++ b/include/asm-generic/qrwlock.h
@@ -219,9 +219,7 @@ static inline void queue_write_unlock(struct qrwlock *lock)
 	/*
 	 * Make sure that none of the critical section will be leaked out.
 	 */
-	smp_mb__before_clear_bit();
-	ACCESS_ONCE(lock->cnts.writer) = 0;
-	smp_mb__after_clear_bit();
+	smp_store_release(&lock->cnts.writer, 0);
 }
 
 /*
-- 
1.7.1

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