mm: introduce for_each_populated_zone() macro

Impact: cleanup

In almost cases, for_each_zone() is used with populated_zone().  It's
because almost function doesn't need memoryless node information.
Therefore, for_each_populated_zone() can help to make code simplify.

This patch has no functional change.

[akpm@linux-foundation.org: small cleanup]
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 21 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a3803ea8c27d..cbd532161f68 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -922,13 +922,10 @@ static void drain_pages(unsigned int cpu)
 	unsigned long flags;
 	struct zone *zone;
 
-	for_each_zone(zone) {
+	for_each_populated_zone(zone) {
 		struct per_cpu_pageset *pset;
 		struct per_cpu_pages *pcp;
 
-		if (!populated_zone(zone))
-			continue;
-
 		pset = zone_pcp(zone, cpu);
 
 		pcp = &pset->pcp;
@@ -1879,10 +1876,7 @@ void show_free_areas(void)
 	int cpu;
 	struct zone *zone;
 
-	for_each_zone(zone) {
-		if (!populated_zone(zone))
-			continue;
-
+	for_each_populated_zone(zone) {
 		show_node(zone);
 		printk("%s per-cpu:\n", zone->name);
 
@@ -1922,12 +1916,9 @@ void show_free_areas(void)
 		global_page_state(NR_PAGETABLE),
 		global_page_state(NR_BOUNCE));
 
-	for_each_zone(zone) {
+	for_each_populated_zone(zone) {
 		int i;
 
-		if (!populated_zone(zone))
-			continue;
-
 		show_node(zone);
 		printk("%s"
 			" free:%lukB"
@@ -1967,12 +1958,9 @@ void show_free_areas(void)
 		printk("\n");
 	}
 
-	for_each_zone(zone) {
+	for_each_populated_zone(zone) {
  		unsigned long nr[MAX_ORDER], flags, order, total = 0;
 
-		if (!populated_zone(zone))
-			continue;
-
 		show_node(zone);
 		printk("%s: ", zone->name);
 
@@ -2784,11 +2772,7 @@ static int __cpuinit process_zones(int cpu)
 
 	node_set_state(node, N_CPU);	/* this node has a cpu */
 
-	for_each_zone(zone) {
-
-		if (!populated_zone(zone))
-			continue;
-
+	for_each_populated_zone(zone) {
 		zone_pcp(zone, cpu) = kmalloc_node(sizeof(struct per_cpu_pageset),
 					 GFP_KERNEL, node);
 		if (!zone_pcp(zone, cpu))