memcg: remove mem_cgroup_reclaim_imbalance() remnants

commit 4f98a2fe (vmscan: split LRU lists
into anon & file sets) removed mem_cgroup_reclaim_imbalance(), but there
are some leftovers in memcontrol.h.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/memcontrol.h

@@ -88,8 +88,6 @@ extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
 /*
  * For memory reclaim.
  */
-extern long mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem);
-
 extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem);
 extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 							int priority);
@@ -210,11 +208,6 @@ static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 {
 }
 
-static inline int mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem)
-{
-	return 0;
-}
-
 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 {
 	return 0;