From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752196AbcAFUR2 (ORCPT ); Wed, 6 Jan 2016 15:17:28 -0500 Received: from mail-qg0-f54.google.com ([209.85.192.54]:36309 "EHLO mail-qg0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751981AbcAFURZ (ORCPT ); Wed, 6 Jan 2016 15:17:25 -0500 Date: Wed, 6 Jan 2016 15:17:23 -0500 From: Tejun Heo To: linux-kernel@vger.kernel.org, dvyukov@google.com, mingo@kernel.org, peterz@infradead.org, sasha.levin@oracle.com, torvalds@linux-foundation.org, hpa@zytor.com, tglx@linutronix.de Cc: linux-tip-commits@vger.kernel.org Subject: Re: [tip:sched/core] sched/core: Fix unserialized r-m-w scribbling stuff Message-ID: <20160106201723.GH3660@htj.duckdns.org> References: <20151125150207.GM11639@twins.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jan 06, 2016 at 10:48:15AM -0800, tip-bot for Peter Zijlstra wrote: > Commit-ID: be958bdc96f18bc1356177bbb79d46ea0c037b96 > Gitweb: http://git.kernel.org/tip/be958bdc96f18bc1356177bbb79d46ea0c037b96 > Author: Peter Zijlstra > AuthorDate: Wed, 25 Nov 2015 16:02:07 +0100 > Committer: Ingo Molnar > CommitDate: Wed, 6 Jan 2016 11:01:07 +0100 > > sched/core: Fix unserialized r-m-w scribbling stuff > > Some of the sched bitfieds (notably sched_reset_on_fork) can be set > on other than current, this can cause the r-m-w to race with other > updates. > > Since all the sched bits are serialized by scheduler locks, pull them > in a separate word. > > Reported-by: Tejun Heo > Signed-off-by: Peter Zijlstra (Intel) > Cc: Dmitry Vyukov > Cc: Linus Torvalds > Cc: Peter Zijlstra > Cc: Sasha Levin > Cc: Thomas Gleixner > Cc: akpm@linux-foundation.org > Cc: hannes@cmpxchg.org > Cc: mhocko@kernel.org > Cc: vdavydov@parallels.com > Link: http://lkml.kernel.org/r/20151125150207.GM11639@twins.programming.kicks-ass.net > Signed-off-by: Ingo Molnar cc stable? -- tejun