cgroup: separate out cset_group_from_root() from task_cgroup_from_root()

This will be used by the planned migration path update.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2014-02-25 10:04:02 -05:00
commit ceb6a081f6