[PATCH] mm: add populated_zone() helper
There are numerous places we check whether a zone is populated or not.
Provide a helper function to check for populated zones and convert all
checks for zone->present_pages.
Signed-off-by: Con Kolivas <kernel@kolivas.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 5c8a412..7681d8e 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -897,7 +897,7 @@
for (i = 0; zones[i] != NULL; i++) {
struct zone *zone = zones[i];
- if (zone->present_pages == 0)
+ if (!populated_zone(zone))
continue;
if (!cpuset_zone_allowed(zone, __GFP_HARDWALL))
@@ -1069,7 +1069,7 @@
for (i = pgdat->nr_zones - 1; i >= 0; i--) {
struct zone *zone = pgdat->node_zones + i;
- if (zone->present_pages == 0)
+ if (!populated_zone(zone))
continue;
if (zone->all_unreclaimable &&
@@ -1106,7 +1106,7 @@
struct zone *zone = pgdat->node_zones + i;
int nr_slab;
- if (zone->present_pages == 0)
+ if (!populated_zone(zone))
continue;
if (zone->all_unreclaimable && priority != DEF_PRIORITY)
@@ -1258,7 +1258,7 @@
{
pg_data_t *pgdat;
- if (zone->present_pages == 0)
+ if (!populated_zone(zone))
return;
pgdat = zone->zone_pgdat;