Index: linux-2.6/mm/page_alloc.c
===================================================================
--- linux-2.6.orig/mm/page_alloc.c	2007-01-04 09:07:32.000000000 -0800
+++ linux-2.6/mm/page_alloc.c	2007-01-04 09:08:00.000000000 -0800
@@ -711,6 +711,9 @@
 	for_each_zone(zone) {
 		struct per_cpu_pageset *pset;
 
+		if (!populated_zone(zone))
+			continue;
+
 		pset = zone_pcp(zone, cpu);
 		for (i = 0; i < ARRAY_SIZE(pset->pcp); i++) {
 			struct per_cpu_pages *pcp;