From cb0f1fe9ba47c202a98a9d41ad5c12c0ac7732e9 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Thu, 13 Feb 2014 06:58:41 -0500
Subject: [PATCH] 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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