Commit ee99c71c authored by KOSAKI Motohiro's avatar KOSAKI Motohiro Committed by Linus Torvalds
Browse files

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: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a6dc60f8

include/linux/mmzone.h

+8 −0
Original line number Diff line number Diff line
@@ -806,6 +806,14 @@ extern struct zone *next_zone(struct zone *zone); 
	     zone;					\

	     zone = next_zone(zone))



#define for_each_populated_zone(zone)		        \

	for (zone = (first_online_pgdat())->node_zones; \

	     zone;					\

	     zone = next_zone(zone))			\

		if (!populated_zone(zone))		\

			; /* do nothing */		\

		else



static inline struct zone *zonelist_zone(struct zoneref *zoneref)

{

	return zoneref->zone;

kernel/power/snapshot.c

+3 −6
Original line number Diff line number Diff line
@@ -321,13 +321,10 @@ static int create_mem_extents(struct list_head *list, gfp_t gfp_mask) 


	INIT_LIST_HEAD(list);



	for_each_zone(zone) {

	for_each_populated_zone(zone) {

		unsigned long zone_start, zone_end;

		struct mem_extent *ext, *cur, *aux;



		if (!populated_zone(zone))

			continue;



		zone_start = zone->zone_start_pfn;

		zone_end = zone->zone_start_pfn + zone->spanned_pages;
@@ -804,8 +801,8 @@ static unsigned int count_free_highmem_pages(void) 
	struct zone *zone;

	unsigned int cnt = 0;



	for_each_zone(zone)

		if (populated_zone(zone) && is_highmem(zone))

	for_each_populated_zone(zone)

		if (is_highmem(zone))

			cnt += zone_page_state(zone, NR_FREE_PAGES);



	return cnt;

kernel/power/swsusp.c

+8 −9
Original line number Diff line number Diff line
@@ -229,8 +229,7 @@ int swsusp_shrink_memory(void) 
		size = count_data_pages() + PAGES_FOR_IO + SPARE_PAGES;

		tmp = size;

		size += highmem_size;

		for_each_zone (zone)

			if (populated_zone(zone)) {

		for_each_populated_zone(zone) {

			tmp += snapshot_additional_pages(zone);

			if (is_highmem(zone)) {

				highmem_size -=

mm/page_alloc.c

+5 −21
Original line number Diff line number Diff line
@@ -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))

mm/vmscan.c

+1 −3
Original line number Diff line number Diff line
@@ -2061,11 +2061,9 @@ static unsigned long shrink_all_zones(unsigned long nr_pages, int prio, 
	struct zone *zone;

	unsigned long ret = 0;



	for_each_zone(zone) {

	for_each_populated_zone(zone) {

		enum lru_list l;



		if (!populated_zone(zone))

			continue;

		if (zone_is_all_unreclaimable(zone) && prio != DEF_PRIORITY)

			continue;

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