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

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From	Tejun Heo <tj@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [tip:sched/core] sched/core: Fix unserialized r-m-w scribbling stuff
Date	Wed, 06 Jan 2016 21:20:02 +0100
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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@infradead.org>
> AuthorDate: Wed, 25 Nov 2015 16:02:07 +0100
> Committer:  Ingo Molnar <mingo@kernel.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@kernel.org>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> Cc: Dmitry Vyukov <dvyukov@google.com>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Sasha Levin <sasha.levin@oracle.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> 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 <mingo@kernel.org>

cc stable?

-- 
tejun
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[tip:sched/core] sched/core:   Fix unserialized r-m-w scribbling stuff tip-bot for Peter Zijlstra <tipbot@zytor.com> - 2016-01-06 19:50 +0100
  Re: [tip:sched/core] sched/core: Fix unserialized r-m-w scribbling  stuff Tejun Heo <tj@kernel.org> - 2016-01-06 21:20 +0100

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