diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 4509f0cfaf39..27973166af28 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -84,28 +84,26 @@ struct page {
 		 */
 		unsigned counters;
 #endif
-		struct {
+		unsigned int active;		/* SLAB */
+		struct {			/* SLUB */
+			unsigned inuse:16;
+			unsigned objects:15;
+			unsigned frozen:1;
+		};
+		int units;			/* SLOB */
 
-			union {
-				/*
-				 * Count of ptes mapped in mms, to show when
-				 * page is mapped & limit reverse map searches.
-				 *
-				 * Extra information about page type may be
-				 * stored here for pages that are never mapped,
-				 * in which case the value MUST BE <= -2.
-				 * See page-flags.h for more details.
-				 */
-				atomic_t _mapcount;
+		struct {			/* Page cache */
+			/*
+			 * Count of ptes mapped in mms, to show when
+			 * page is mapped & limit reverse map searches.
+			 *
+			 * Extra information about page type may be
+			 * stored here for pages that are never mapped,
+			 * in which case the value MUST BE <= -2.
+			 * See page-flags.h for more details.
+			 */
+			atomic_t _mapcount;
 
-				unsigned int active;		/* SLAB */
-				struct {			/* SLUB */
-					unsigned inuse:16;
-					unsigned objects:15;
-					unsigned frozen:1;
-				};
-				int units;			/* SLOB */
-			};
 			/*
 			 * Usage count, *USE WRAPPER FUNCTION* when manual
 			 * accounting. See page_ref.h