diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 7aba9f2..4562d09 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -88,7 +88,6 @@
 /*
  * For memory reclaim.
  */
-extern int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem);
 extern long mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem);
 
 extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem);
@@ -211,11 +210,6 @@
 {
 }
 
-static inline int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem)
-{
-	return 0;
-}
-
 static inline int mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem)
 {
 	return 0;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 2bdb614..7bb14fd 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -508,23 +508,6 @@
 }
 
 /*
- * Calculate mapped_ratio under memory controller. This will be used in
- * vmscan.c for deteremining we have to reclaim mapped pages.
- */
-int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem)
-{
-	long total, rss;
-
-	/*
-	 * usage is recorded in bytes. But, here, we assume the number of
-	 * physical pages can be represented by "long" on any arch.
-	 */
-	total = (long) (mem->res.usage >> PAGE_SHIFT) + 1L;
-	rss = (long)mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_RSS);
-	return (int)((rss * 100L) / total);
-}
-
-/*
  * prev_priority control...this will be used in memory reclaim path.
  */
 int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)