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mm: introduce for_each_populated_zone() macro

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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>
This commit is contained in:
KOSAKI Motohiro
2009-03-31 15:19:31 -07:00
committed by Linus Torvalds
parent a6dc60f897
commit ee99c71c59
6 changed files with 27 additions and 48 deletions
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17
kernel/power/swsusp.c
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@ -229,17 +229,16 @@ 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)) {
tmp += snapshot_additional_pages(zone);
if (is_highmem(zone)) {
highmem_size -=
for_each_populated_zone(zone) {
tmp += snapshot_additional_pages(zone);
if (is_highmem(zone)) {
highmem_size -=
zone_page_state(zone, NR_FREE_PAGES);
} else {
tmp -= zone_page_state(zone, NR_FREE_PAGES);
tmp += zone->lowmem_reserve[ZONE_NORMAL];
}
} else {
tmp -= zone_page_state(zone, NR_FREE_PAGES);
tmp += zone->lowmem_reserve[ZONE_NORMAL];
}
}
if (highmem_size < 0)
highmem_size = 0;