memcg: cleanup with !CONFIG_MEMCG_V1

Extern declarations have no definitions with !CONFIG_MEMCG_V1 and no
users, drop them altogether.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Michal Koutný <[email protected]>
Acked-by: Shakeel Butt <[email protected]>
Acked-by: Tejun Heo <[email protected]>
Cc: Chen Ridong <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: Roman Gushchin <[email protected]>
Cc: Zefan Li <[email protected]>
Cc: Waiman Long <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: Werkov

mm/memcontrol-v1.h

@@ -154,8 +154,6 @@ static inline bool memcg1_charge_skmem(struct mem_cgroup *memcg, unsigned int nr
 				       gfp_t gfp_mask) { return true; }
 static inline void memcg1_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages) {}
 
-extern struct cftype memsw_files[];
-extern struct cftype mem_cgroup_legacy_files[];
 #endif	/* CONFIG_MEMCG_V1 */
 
 #endif	/* __MM_MEMCONTROL_V1_H */