From: Li Zefan <lizefan@huawei.com>
Date: Thu, 7 Jun 2012 02:12:30 +0000 (-0700)
Subject: cgroup: remove hierarchy_mutex
X-Git-Tag: v3.6-rc1~105^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6be96a5c905178637ec06a5d456a76b2b304fca3;p=pandora-kernel.git

cgroup: remove hierarchy_mutex

It was introduced for memcg to iterate cgroup hierarchy without
holding cgroup_mutex, but soon after that it was replaced with
a lockless way in memcg.

No one used hierarchy_mutex since that, so remove it.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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