Index: linux-2.6.18-rc6-mm2/include/linux/mm.h
===================================================================
--- linux-2.6.18-rc6-mm2.orig/include/linux/mm.h	2006-09-18 14:09:30.757176622 -0500
+++ linux-2.6.18-rc6-mm2/include/linux/mm.h	2006-09-18 14:09:35.937295682 -0500
@@ -446,7 +446,11 @@ static inline struct zone *page_zone(str
 
 static inline unsigned long zone_to_nid(struct zone *zone)
 {
+#ifdef CONFIG_NUMA
 	return zone->node;
+#else
+	return 0;
+#endif
 }
 
 static inline unsigned long page_to_nid(struct page *page)