From 0f060deb5c5107486c5dadd5c715b3693d381e0a Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Tue, 18 Nov 2014 02:49:50 -0500
Subject: [PATCH] cgroup: separate out cgroup_calc_child_subsys_mask() from
 cgroup_refresh_child_subsys_mask()

cgroup_refresh_child_subsys_mask() calculates and updates the
effective @cgrp->child_subsys_maks according to the current
@cgrp->subtree_control.  Separate out the calculation part into
cgroup_calc_child_subsys_mask().  This will be used to fix a bug in
the async css offline wait logic.

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