From: Tejun Heo <tj@kernel.org>
Date: Thu, 13 Feb 2014 11:58:41 +0000 (-0500)
Subject: cgroup: move css_set_rwsem locking outside of cgroup_task_migrate()
X-Git-Tag: v3.15-rc1~109^2~36
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cb0f1fe9ba47c202a98a9d41ad5c12c0ac7732e9;p=pandora-kernel.git

cgroup: move css_set_rwsem locking outside of cgroup_task_migrate()

Instead of repeatedly locking and unlocking css_set_rwsem inside
cgroup_task_migrate(), update cgroup_attach_task() to grab it outside
of the loop and update cgroup_task_migrate() to use
put_css_set_locked().

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