memcg: fail to create cgroup if the cgroup id is too big
memcg requires the cgroup id to be smaller than 65536. This is a preparation to kill css id. Signed-off-by: NLi Zefan <lizefan@huawei.com> Acked-by: NMichal Hocko <mhocko@suse.cz> Signed-off-by: NTejun Heo <tj@kernel.org>
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