cgroup: convert memcg controller to the new cftype interface
Convert memcg to use the new cftype based interface. kmem support abuses ->populate() for mem_cgroup_sockets_init() so it can't be removed at the moment. tcp_memcontrol is updated so that tcp_files[] is registered via a __initcall. This change also allows removing the forward declaration of tcp_files[]. Removed. Signed-off-by: NTejun Heo <tj@kernel.org> Acked-by: NKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: NLi Zefan <lizf@cn.fujitsu.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Balbir Singh <bsingharora@gmail.com> Cc: Glauber Costa <glommer@parallels.com> Cc: Hugh Dickins <hughd@google.com> Cc: Greg Thelen <gthelen@google.com>
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