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The memcg code does not allow changing memory.use_hierarchy if the parent cgroup has enabled use_hierarchy. Update documentation to match the code. Signed-off-by: Greg Thelen <gthelen@google.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>