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Add help to update cgroup CGRP_FROZEN flag. Both cgroup_propagate_frozen and cgroup_update_frozen functions update CGRP_FROZEN flag, this makes code concise. Reviewed-by: Michal Koutný <mkoutny@suse.com> Signed-off-by: Chen Ridong <chenridong@huawei.com> Signed-off-by: Tejun Heo <tj@kernel.org>