cgroup: reorganize cgroup_subtree_control_write()
Make the following two reorganizations to
cgroup_subtree_control_write(). These are to prepare for future
changes and shouldn't cause any functional difference.
* Move availability above css offlining wait.
* Move cgrp->child_subsys_mask update above new css creation.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
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