[PATCH 4/4] mm/vmstat: make node_page_state() handles all zones by itself

[js1304]

From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>

node_page_state() manually add statistics per each zone and return
total value for all zones. Whenever we add a new zone, we need to
consider this function and it's really troublesome. Make it handles
all zones by itself.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
---
 mm/vmstat.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 0a726e3..a7de9ad 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -600,19 +600,13 @@ void zone_statistics(struct zone *preferred_zone, struct zone *z, gfp_t flags)
 unsigned long node_page_state(int node, enum zone_stat_item item)
 {
 	struct zone *zones = NODE_DATA(node)->node_zones;
+	int i;
+	unsigned long count = 0;
 
-	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
-#ifdef CONFIG_HIGHMEM
-		zone_page_state(&zones[ZONE_HIGHMEM], item) +
-#endif
-		zone_page_state(&zones[ZONE_NORMAL], item) +
-		zone_page_state(&zones[ZONE_MOVABLE], item);
+	for (i = 0; i < MAX_NR_ZONES; i++)
+		count += zone_page_state(zones + i, item);
+
+	return count;
 }
 
 #endif
-- 
1.9.1