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Subject[RFC 03/16] mm/highmem: make nr_free_highpages() handles all highmem zones by itself
Date
nr_free_highpages() manually add statistics per each highmem zone
and return total value for them. Whenever we add a new highmem zone,
we need to consider this function and it's really troublesome. Make
it handles all highmem zones by itself.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
---
mm/highmem.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/mm/highmem.c b/mm/highmem.c
index 123bcd3..50b4ca6 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -112,16 +112,12 @@ EXPORT_PER_CPU_SYMBOL(__kmap_atomic_idx);

unsigned int nr_free_highpages (void)
{
- pg_data_t *pgdat;
+ struct zone *zone;
unsigned int pages = 0;

- for_each_online_pgdat(pgdat) {
- pages += zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM],
- NR_FREE_PAGES);
- if (zone_movable_is_highmem())
- pages += zone_page_state(
- &pgdat->node_zones[ZONE_MOVABLE],
- NR_FREE_PAGES);
+ for_each_populated_zone(zone) {
+ if (is_highmem(zone))
+ pages += zone_page_state(zone, NR_FREE_PAGES);
}

return pages;
--
1.7.9.5


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