diff -urNp --exclude CVS --exclude BitKeeper 2.4.23pre4/mm/page_alloc.c x/mm/page_alloc.c
--- 2.4.23pre4/mm/page_alloc.c	2003-09-13 00:08:04.000000000 +0200
+++ x/mm/page_alloc.c	2003-09-18 06:42:15.000000000 +0200
@@ -512,14 +512,12 @@ unsigned int nr_free_buffer_pages (void)
 		class_idx = zone_idx(zone);
 
 		sum += zone->nr_cache_pages;
-		do {
-			unsigned int free = zone->free_pages - zone->watermarks[class_idx].high;
-			zonep++;
-			zone = *zonep;
+		for (zone = pgdat->node_zones; zone < pgdat->node_zones + MAX_NR_ZONES; zone++) {
+			int free = zone->free_pages - zone->watermarks[class_idx].high;
 			if (free <= 0)
 				continue;
 			sum += free;
-		} while (zone);
+		}
 	}
 
 	return sum;