linux-kernel - Re: [PATCH] cpusets: rework guarantee_online_cpus() to fix deadlock with cpu

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Message-ID: <20090801053454.GA26596@redhat.com>
Date:	Sat, 1 Aug 2009 07:34:54 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org, Li Zefan <lizf@...fujitsu.com>,
	Miao Xie <miaox@...fujitsu.com>,
	Paul Menage <menage@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Gautham R Shenoy <ego@...ibm.com>
Subject: Re: [PATCH] cpusets: rework guarantee_online_cpus() to fix
	deadlock with cpu_down()

Sorry for noise, forgot to mention...

On 08/01, Oleg Nesterov wrote:
>
> 	- adds cpuset->cpumask_lock, this lock is taken by
> 	  update_cpumask() around cpumask_copy(cs->cpus_allowed, newcpus).

Most probably there are other places where ->cpus_allowed is changed,
in that case they need ->cpumask_lock too. But this is trivial, the
patch I sent just explains what I meant.

Oleg.

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