Re: [PATCH cgroup/for-3.15-fixes] blkcg: use trylock on blkcg_pol_mutex in blkcg_reset_stats()

[Tejun Heo]

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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