[PATCH 05/09] make zone_nr_pages() helper function

[KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>]

make zone_nr_pages() function.
it is used by latter patch.

this patch doesn't have any functional change.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
---
 mm/vmscan.c |   15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

Index: b/mm/vmscan.c
===================================================================
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -140,6 +140,13 @@ static struct zone_reclaim_stat *get_rec
 	return &zone->reclaim_stat;
 }
 
+static unsigned long zone_nr_pages(struct zone *zone, struct scan_control *sc,
+				   enum lru_list lru)
+{
+	return zone_page_state(zone, NR_LRU_BASE + lru);
+}
+
+
 /*
  * Add a shrinker callback to be called from the vm
  */
@@ -1435,10 +1442,10 @@ static void get_scan_ratio(struct zone *
 		return;
 	}
 
-	anon  = zone_page_state(zone, NR_ACTIVE_ANON) +
-		zone_page_state(zone, NR_INACTIVE_ANON);
-	file  = zone_page_state(zone, NR_ACTIVE_FILE) +
-		zone_page_state(zone, NR_INACTIVE_FILE);
+	anon  = zone_nr_pages(zone, sc, LRU_ACTIVE_ANON) +
+		zone_nr_pages(zone, sc, LRU_INACTIVE_ANON);
+	file  = zone_nr_pages(zone, sc, LRU_ACTIVE_FILE) +
+		zone_nr_pages(zone, sc, LRU_INACTIVE_FILE);
 	free  = zone_page_state(zone, NR_FREE_PAGES);
 
 	/* If we have very few page cache pages, force-scan anon pages. */


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