tree 28d344a6ebeecc252596933257412a92f3ab1626
parent 12b3bb6af862477f96e1adac51b201a143a8f3c4
author Tejun Heo <tj@kernel.org> 1457017079 -0500
committer Tejun Heo <tj@kernel.org> 1457017079 -0500

cgroup: factor out cgroup_apply_control_enable() from cgroup_subtree_control_write()

Factor out css enabling and showing into cgroup_apply_control_enable().

* Nest subsystem walk inside child walk.  The child walk will later be
  converted to subtree walk which is a bit more expensive.

* Instead of operating on the differential masks @css_enable, simply
  enable or show csses according to the current cgroup_control() and
  cgroup_ss_mask().  This leads to the same result and is simpler and
  more robust.

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