Message-ID: <488E75E9.9080202@cn.fujitsu.com>
Date: Tue, 29 Jul 2008 09:44:09 +0800
From: Li Zefan <lizf@cn.fujitsu.com>
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To: Paul Jackson <pj@sgi.com>
CC: akpm@linux-foundation.org, menage@google.com,
       seto.hidetoshi@jp.fujitsu.com, laijs@cn.fujitsu.com,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] cpuset: clean up cpuset hierarchy traversal code
References: <488D332A.1030008@cn.fujitsu.com>	<20080727233746.7f057e74.pj@sgi.com> <20080728001205.f3801aca.pj@sgi.com>
In-Reply-To: <20080728001205.f3801aca.pj@sgi.com>
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Paul Jackson wrote:
> pj wrote:
>> Can you figure out if we are holding any system wide lock, such as
>> cgroup_mutex, at this point?
> 
> Nevermind ... this is in rebuild_sched_domains(), which must be
> called with cgroup_mutex held.  So we danged well better be holding
> a system wide lock.
> 

Yes, and even after Max's patch, the code playing with ->stack_list is
still protected by cgroup_mutex. :)

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