diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index cfd162882c00a157ce30ada845361593982c1b27..3708264d28332d4a8ec17bd929110a5b212f5529 100644
--- a/mm/page_cgroup.c
+++ b/mm/page_cgroup.c
@@ -175,7 +175,7 @@ static void free_page_cgroup(void *addr)
 	}
 }
 
-void __free_page_cgroup(unsigned long pfn)
+static void __free_page_cgroup(unsigned long pfn)
 {
 	struct mem_section *ms;
 	struct page_cgroup *base;
@@ -188,9 +188,9 @@ void __free_page_cgroup(unsigned long pfn)
 	ms->page_cgroup = NULL;
 }
 
-int __meminit online_page_cgroup(unsigned long start_pfn,
-			unsigned long nr_pages,
-			int nid)
+static int __meminit online_page_cgroup(unsigned long start_pfn,
+				unsigned long nr_pages,
+				int nid)
 {
 	unsigned long start, end, pfn;
 	int fail = 0;
@@ -223,8 +223,8 @@ int __meminit online_page_cgroup(unsigned long start_pfn,
 	return -ENOMEM;
 }
 
-int __meminit offline_page_cgroup(unsigned long start_pfn,
-		unsigned long nr_pages, int nid)
+static int __meminit offline_page_cgroup(unsigned long start_pfn,
+				unsigned long nr_pages, int nid)
 {
 	unsigned long start, end, pfn;