tree 09cd7ebc9e5b494fe4ec33236b51d28d7feca3a0
parent 72ce148494bd1317037633189061b768339fa11e
author Tejun Heo <tj@kernel.org> 1389981507 -0500
committer Tejun Heo <tj@kernel.org> 1389981507 -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>