linux-kernel - [PATCH v7 4/4] qrwlock: Use smp_store_release() in write

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1385147087-26588-5-git-send-email-Waiman.Long@hp.com>
Date:	Fri, 22 Nov 2013 14:04:47 -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 v7 4/4] 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 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/