From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756020Ab3KVTF0 (ORCPT ); Fri, 22 Nov 2013 14:05:26 -0500 Received: from g1t0029.austin.hp.com ([15.216.28.36]:31520 "EHLO g1t0029.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755963Ab3KVTFR (ORCPT ); Fri, 22 Nov 2013 14:05:17 -0500 From: Waiman Long To: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Arnd Bergmann Cc: linux-arch@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, Peter Zijlstra , Steven Rostedt , Andrew Morton , Michel Lespinasse , Andi Kleen , Rik van Riel , "Paul E. McKenney" , Linus Torvalds , Raghavendra K T , George Spelvin , Tim Chen , "Aswin Chandramouleeswaran\"" , Scott J Norton , Waiman Long Subject: [PATCH v7 4/4] qrwlock: Use smp_store_release() in write_unlock() Date: Fri, 22 Nov 2013 14:04:47 -0500 Message-Id: <1385147087-26588-5-git-send-email-Waiman.Long@hp.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1385147087-26588-1-git-send-email-Waiman.Long@hp.com> References: <1385147087-26588-1-git-send-email-Waiman.Long@hp.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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 335473a..59c5972 100644 --- a/include/asm-generic/qrwlock.h +++ b/include/asm-generic/qrwlock.h @@ -176,9 +176,7 @@ 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