diff --git a/mm/mincore.c b/mm/mincore.c
index 95c5f49..9780097 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -116,8 +116,13 @@
 				/* migration entries are always uptodate */
 				present = 1;
 			} else {
+#ifdef CONFIG_SWAP
 				pgoff = entry.val;
 				present = mincore_page(&swapper_space, pgoff);
+#else
+				WARN_ON(1);
+				present = 1;
+#endif
 			}
 		}
 	}