linux-kernel - Re: [tip:sched/core] sched/core: Fix unserialized r-m-w scribbling stuff

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Message-ID: <20160106201723.GH3660@htj.duckdns.org>
Date:	Wed, 6 Jan 2016 15:17:23 -0500
From:	Tejun Heo <tj@...nel.org>
To:	linux-kernel@...r.kernel.org, dvyukov@...gle.com, mingo@...nel.org,
	peterz@...radead.org, sasha.levin@...cle.com,
	torvalds@...ux-foundation.org, hpa@...or.com, tglx@...utronix.de
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/core] sched/core: Fix unserialized r-m-w scribbling
 stuff

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 <peterz@...radead.org>
> AuthorDate: Wed, 25 Nov 2015 16:02:07 +0100
> Committer:  Ingo Molnar <mingo@...nel.org>
> 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 <tj@...nel.org>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Cc: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Sasha Levin <sasha.levin@...cle.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: akpm@...ux-foundation.org
> Cc: hannes@...xchg.org
> Cc: mhocko@...nel.org
> Cc: vdavydov@...allels.com
> Link: http://lkml.kernel.org/r/20151125150207.GM11639@twins.programming.kicks-ass.net
> Signed-off-by: Ingo Molnar <mingo@...nel.org>

cc stable?

-- 
tejun
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