[PATCH] page_referenced() simplification

There's no point in calling mark_page_accessed() here.  The page is never on
the LRU so all mark_page_accessed() will do is to set PG_referenced, which we
immediately clear again.

mm/rmap.c

@@ -118,7 +118,7 @@ int fastcall page_referenced(struct page * page)
 	int referenced = 0;
 
 	if (page_test_and_clear_young(page))
-		mark_page_accessed(page);
+		referenced++;
 
 	if (TestClearPageReferenced(page))
 		referenced++;