[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>

1 files changed, 4 insertions, 4 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b9fd2c238f13..8f3de5af92dd 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1358,7 +1358,7 @@ void show_free_areas(void)
                 show_node(zone);
                 printk("%s per-cpu:", zone->name);
 
-                if (!zone->present_pages) {
+                if (!populated_zone(zone)) {
                         printk(" empty\n");
                         continue;
                 } else
@@ -1435,7 +1435,7 @@ void show_free_areas(void)
 
                 show_node(zone);
                 printk("%s: ", zone->name);
-                if (!zone->present_pages) {
+                if (!populated_zone(zone)) {
                         printk("empty\n");
                         continue;
                 }
@@ -2134,7 +2134,7 @@ static int frag_show(struct seq_file *m, void *arg)
         int order;
 
         for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
-                if (!zone->present_pages)
+                if (!populated_zone(zone))
                         continue;
 
                 spin_lock_irqsave(&zone->lock, flags);
@@ -2167,7 +2167,7 @@ static int zoneinfo_show(struct seq_file *m, void *arg)
         for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; zone++) {
                 int i;
 
-                if (!zone->present_pages)
+                if (!populated_zone(zone))
                         continue;
 
                 spin_lock_irqsave(&zone->lock, flags);