vmstat: Make ZONE_DMA support configurable

Do not display ZONE_DMA counters if no DMA zone is available.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.18-rc5-mm1/include/linux/vmstat.h
===================================================================
--- linux-2.6.18-rc5-mm1.orig/include/linux/vmstat.h	2006-09-01 16:16:26.000000000 -0700
+++ linux-2.6.18-rc5-mm1/include/linux/vmstat.h	2006-09-02 20:21:09.000000000 -0700
@@ -17,6 +17,12 @@
  * generated will simply be the increment of a global address.
  */
 
+#ifdef CONFIG_ZONE_DMA
+#define DMA_ZONE(xx) xx##_DMA,
+#else
+#define DMA_ZONE(xx)
+#endif
+
 #ifdef CONFIG_ZONE_DMA32
 #define DMA32_ZONE(xx) xx##_DMA32,
 #else
@@ -29,7 +35,7 @@
 #define HIGHMEM_ZONE(xx)
 #endif
 
-#define FOR_ALL_ZONES(xx) xx##_DMA, DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx)
+#define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx)
 
 enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
 		FOR_ALL_ZONES(PGALLOC),
@@ -87,9 +93,13 @@
 
 #endif /* CONFIG_VM_EVENT_COUNTERS */
 
+#ifdef CONFIG_ZONE_DMA
 #define __count_zone_vm_events(item, zone, delta) \
 			__count_vm_events(item##_DMA + zone_idx(zone), delta)
-
+#else
+#define __count_zone_vm_events(item, zone, delta) \
+			__count_vm_events(item##_NORMAL + zone_idx(zone), delta)
+#endif
 /*
  * Zone based page accounting with per cpu differentials.
  */
@@ -135,14 +145,16 @@
 	struct zone *zones = NODE_DATA(node)->node_zones;
 
 	return
+#ifdef CONFIG_ZONE_DMA
+		zone_page_state(&zones[ZONE_DMA], item) +
+#endif
 #ifdef CONFIG_ZONE_DMA32
 		zone_page_state(&zones[ZONE_DMA32], item) +
 #endif
-		zone_page_state(&zones[ZONE_NORMAL], item) +
 #ifdef CONFIG_HIGHMEM
 		zone_page_state(&zones[ZONE_HIGHMEM], item) +
 #endif
-		zone_page_state(&zones[ZONE_DMA], item);
+		zone_page_state(&zones[ZONE_NORMAL], item);
 }
 
 extern void zone_statistics(struct zonelist *, struct zone *);
Index: linux-2.6.18-rc5-mm1/mm/vmstat.c
===================================================================
--- linux-2.6.18-rc5-mm1.orig/mm/vmstat.c	2006-09-01 16:16:26.000000000 -0700
+++ linux-2.6.18-rc5-mm1/mm/vmstat.c	2006-09-02 20:20:11.000000000 -0700
@@ -437,6 +437,12 @@
 	.show	= frag_show,
 };
 
+#ifdef CONFIG_ZONE_DMA
+#define TEXT_FOR_DMA(xx) xx "_dma",
+#else
+#define TEXT_FOR_DMA(xx)
+#endif
+
 #ifdef CONFIG_ZONE_DMA32
 #define TEXT_FOR_DMA32(xx) xx "_dma32",
 #else
@@ -449,7 +455,7 @@
 #define TEXT_FOR_HIGHMEM(xx)
 #endif
 
-#define TEXTS_FOR_ZONES(xx) xx "_dma", TEXT_FOR_DMA32(xx) xx "_normal", \
+#define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \
 					TEXT_FOR_HIGHMEM(xx)
 
 static char *vmstat_text[] = {