diff --git a/include/linux/mm.h b/include/linux/mm.h
index e2fa375..697c6bf 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -465,10 +465,13 @@
 struct zone;
 extern struct zone *zone_table[];
 
+static inline int page_zone_id(struct page *page)
+{
+	return (page->flags >> ZONETABLE_PGSHIFT) & ZONETABLE_MASK;
+}
 static inline struct zone *page_zone(struct page *page)
 {
-	return zone_table[(page->flags >> ZONETABLE_PGSHIFT) &
-			ZONETABLE_MASK];
+	return zone_table[page_zone_id(page)];
 }
 
 static inline unsigned long page_to_nid(struct page *page)