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authorMiaohe Lin <linmiaohe@huawei.com>2022-03-23 00:47:19 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-23 01:57:10 +0300
commitd6aad2016a3f902153d7b8b7e02da2c7c50c10a4 (patch)
treed96c7f53b13a46c6d288c057d0608b24a3b0da32 /mm/memory_hotplug.c
parent2b6bf15f464620bbee08e8257d11f8f9f7f8725f (diff)
downloadlinux-d6aad2016a3f902153d7b8b7e02da2c7c50c10a4.tar.xz
mm/memory_hotplug: avoid calling zone_intersects() for ZONE_NORMAL
If zid reaches ZONE_NORMAL, the caller will always get the NORMAL zone no matter what zone_intersects() returns. So we can save some possible cpu cycles by avoid calling zone_intersects() for ZONE_NORMAL. Link: https://lkml.kernel.org/r/20220207133643.23427-3-linmiaohe@huawei.com Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Oscar Salvador <osalvador@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory_hotplug.c')
-rw-r--r--mm/memory_hotplug.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 39da3812bf47..947ba4fc8124 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -823,7 +823,7 @@ static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long start_pfn
struct pglist_data *pgdat = NODE_DATA(nid);
int zid;
- for (zid = 0; zid <= ZONE_NORMAL; zid++) {
+ for (zid = 0; zid < ZONE_NORMAL; zid++) {
struct zone *zone = &pgdat->node_zones[zid];
if (zone_intersects(zone, start_pfn, nr_pages))