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mm/highmem: simplify is_highmem()

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is_highmem() can be simplified by use of is_highmem_idx().  This patch
removes redundant code and will make it easier to maintain if the zone
policy is changed or a new zone is added.

(akpm: saves me 25 bytes of text per is_highmem() callsite)

Signed-off-by: Chanho Min <chanho.min@lge.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Chanho Min 2016-05-19 17:11:57 -07:00 committed by Linus Torvalds
parent fdd048e12c
commit 29f9cb53d2
1 changed files with 1 additions and 4 deletions
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5
include/linux/mmzone.h
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@ -828,10 +828,7 @@ static inline int is_highmem_idx(enum zone_type idx)
static inline int is_highmem(struct zone *zone)
{
#ifdef CONFIG_HIGHMEM
int zone_off = (char *)zone - (char *)zone->zone_pgdat->node_zones;
return zone_off == ZONE_HIGHMEM * sizeof(*zone) ||
(zone_off == ZONE_MOVABLE * sizeof(*zone) &&
zone_movable_is_highmem());
return is_highmem_idx(zone_idx(zone));
#else
return 0;
#endif