diff --git a/mm/rmap.c b/mm/rmap.c
index 2871e7d..02f0bfc 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1287,21 +1287,17 @@
  */
 void page_add_file_rmap(struct page *page)
 {
-	struct mem_cgroup *memcg;
-
-	memcg = lock_page_memcg(page);
+	lock_page_memcg(page);
 	if (atomic_inc_and_test(&page->_mapcount)) {
 		__inc_zone_page_state(page, NR_FILE_MAPPED);
-		mem_cgroup_inc_page_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED);
+		mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
 	}
-	unlock_page_memcg(memcg);
+	unlock_page_memcg(page);
 }
 
 static void page_remove_file_rmap(struct page *page)
 {
-	struct mem_cgroup *memcg;
-
-	memcg = lock_page_memcg(page);
+	lock_page_memcg(page);
 
 	/* Hugepages are not counted in NR_FILE_MAPPED for now. */
 	if (unlikely(PageHuge(page))) {
@@ -1320,12 +1316,12 @@
 	 * pte lock(a spinlock) is held, which implies preemption disabled.
 	 */
 	__dec_zone_page_state(page, NR_FILE_MAPPED);
-	mem_cgroup_dec_page_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED);
+	mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
 
 	if (unlikely(PageMlocked(page)))
 		clear_page_mlock(page);
 out:
-	unlock_page_memcg(memcg);
+	unlock_page_memcg(page);
 }
 
 static void page_remove_anon_compound_rmap(struct page *page)