diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index b0dc654..bb63b36 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -646,7 +646,7 @@
  * Scanning pfn is much easier than scanning lru list.
  * Scan pfn from start to end and Find LRU page.
  */
-unsigned long scan_lru_pages(unsigned long start, unsigned long end)
+static unsigned long scan_lru_pages(unsigned long start, unsigned long end)
 {
 	unsigned long pfn;
 	struct page *page;