Index: linux-2.6.18-rc1-mm1/mm/vmstat.c
===================================================================
--- linux-2.6.18-rc1-mm1.orig/mm/vmstat.c	2006-07-10 10:33:44.369581118 -0700
+++ linux-2.6.18-rc1-mm1/mm/vmstat.c	2006-07-10 10:46:04.156737703 -0700
@@ -269,6 +269,8 @@ void refresh_cpu_vm_stats(int cpu)
 		struct per_cpu_pageset *pcp;
 
 		pcp = zone_pcp(zone, cpu);
+		if (!pcp)
+			continue;
 
 		for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
 			if (pcp->vm_stat_diff[i]) {
Index: linux-2.6.18-rc1-mm1/mm/page_alloc.c
===================================================================
--- linux-2.6.18-rc1-mm1.orig/mm/page_alloc.c	2006-07-10 10:33:44.352004083 -0700
+++ linux-2.6.18-rc1-mm1/mm/page_alloc.c	2006-07-10 10:47:40.420309927 -0700
@@ -660,6 +660,9 @@ void drain_node_pages(int nodeid)
 		struct per_cpu_pageset *pset;
 
 		pset = zone_pcp(zone, smp_processor_id());
+		if (!pset)
+			continue;
+
 		for (i = 0; i < ARRAY_SIZE(pset->pcp); i++) {
 			struct per_cpu_pages *pcp;
 
@@ -686,6 +689,9 @@ static void __drain_pages(unsigned int c
 		struct per_cpu_pageset *pset;
 
 		pset = zone_pcp(zone, cpu);
+		if (!pset)
+			continue;
+
 		for (i = 0; i < ARRAY_SIZE(pset->pcp); i++) {
 			struct per_cpu_pages *pcp;
 
@@ -1909,6 +1915,11 @@ static int __cpuinit process_zones(int c
 
 	for_each_zone(zone) {
 
+		if (!populated_zone(zone)) {
+			zone_pcp(zone, cpu) = NULL;
+			continue;
+		}
+
 		zone_pcp(zone, cpu) = kmalloc_node(sizeof(struct per_cpu_pageset),
 					 GFP_KERNEL, cpu_to_node(cpu));
 		if (!zone_pcp(zone, cpu))
@@ -2448,6 +2459,9 @@ int percpu_pagelist_fraction_sysctl_hand
 	if (!write || (ret == -EINVAL))
 		return ret;
 	for_each_zone(zone) {
+		if (!populated_zone(zone))
+			continue;
+
 		for_each_online_cpu(cpu) {
 			unsigned long  high;
 			high = zone->present_pages / percpu_pagelist_fraction;