linux-kernel - Re: [PATCH 1/3] cpuset: clean up cpuset hierarchy traversal code

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Date:	Tue, 29 Jul 2008 09:44:09 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Paul Jackson <pj@....com>
CC:	akpm@...ux-foundation.org, menage@...gle.com,
	seto.hidetoshi@...fujitsu.com, laijs@...fujitsu.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] cpuset: clean up cpuset hierarchy traversal code

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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