tree d5b03fc5ec2b71b4fde60ca6337ad45e1fd0ab45
parent 69e943b7d3c2dcca1087e03e556ac6cb0d4433b4
author Tejun Heo <tj@kernel.org> 1391873821 -0500
committer Tejun Heo <tj@kernel.org> 1391873821 -0500

cgroup: remove cgroup_root_mutex

cgroup_root_mutex was added to avoid deadlock involving namespace_sem
via cgroup_show_options().  It added a lot of overhead for the small
purpose of it and, because it's nested under cgroup_mutex, it has very
limited usefulness.  The previous patch made cgroup_show_options() not
use cgroup_root_mutex, so nobody needs it anymore.  Remove it.

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