linux-kernel - Re: [PATCH cgroup/for-3.15-fixes] blkcg: use trylock on blkcg_pol_mutex in blkcg_reset

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Date:	Mon, 5 May 2014 12:38:21 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	axboe@...nel.dk, Sasha Levin <sasha.levin@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>, cgroups@...r.kernel.org
Subject: Re: [PATCH cgroup/for-3.15-fixes] blkcg: use trylock on
 blkcg_pol_mutex in blkcg_reset_stats()

On Mon, May 05, 2014 at 12:37:30PM -0400, Tejun Heo wrote:
> During the recent conversion of cgroup to kernfs, cgroup_tree_mutex
> which nests above both the kernfs s_active protection and cgroup_mutex
> is added to synchronize cgroup file type operations as cgroup_mutex
> needed to be grabbed from some file operations and thus can't be put
> above s_active protection.

Ooh, I verified that the patch removes the lockdep warning and am
routing it through cgroup/for-3.15-fixes.  If there's any objection,
please let me know.

Thanks!

-- 
tejun
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