diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 75f23e9..9692c52 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -59,7 +59,7 @@
 
 struct cgroup_subsys mem_cgroup_subsys __read_mostly;
 #define MEM_CGROUP_RECLAIM_RETRIES	5
-struct mem_cgroup *root_mem_cgroup __read_mostly;
+static struct mem_cgroup *root_mem_cgroup __read_mostly;
 
 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 /* Turned on only when memory cgroup is enabled && really_do_swap_account = 1 */
@@ -1628,7 +1628,7 @@
  * unused nodes. But scan_nodes is lazily updated and may not cotain
  * enough new information. We need to do double check.
  */
-bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap)
+static bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap)
 {
 	int nid;
 
@@ -1663,7 +1663,7 @@
 	return 0;
 }
 
-bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap)
+static bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap)
 {
 	return test_mem_cgroup_node_reclaimable(memcg, 0, noswap);
 }
@@ -1837,7 +1837,8 @@
 /*
  * try to call OOM killer. returns false if we should exit memory-reclaim loop.
  */
-bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask, int order)
+static bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask,
+				  int order)
 {
 	struct oom_wait_info owait;
 	bool locked, need_to_kill;
@@ -3767,7 +3768,7 @@
 	goto move_account;
 }
 
-int mem_cgroup_force_empty_write(struct cgroup *cont, unsigned int event)
+static int mem_cgroup_force_empty_write(struct cgroup *cont, unsigned int event)
 {
 	return mem_cgroup_force_empty(mem_cgroup_from_cont(cont), true);
 }
@@ -4048,7 +4049,7 @@
 	s64 stat[NR_MCS_STAT];
 };
 
-struct {
+static struct {
 	char *local_name;
 	char *total_name;
 } memcg_stat_strings[NR_MCS_STAT] = {