From: Chen Wandun <chenwandun@huawei.com>
Date: Thu, 14 Apr 2022 06:07:09 +0000 (-0700)
Subject: mm/page_alloc: simplify update of pgdat in wake_all_kswapds
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=b24ea048b4c290959996309b62041e9f33569afd;p=users%2Fjedix%2Flinux-maple.git

mm/page_alloc: simplify update of pgdat in wake_all_kswapds

There is no need to update last_pgdat for each zone, only update
last_pgdat when iterating the first zone of a node.

Link: https://lkml.kernel.org/r/20220322115635.2708989-1-chenwandun@huawei.com
Signed-off-by: Chen Wandun <chenwandun@huawei.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6b55fe38d646..1b92795ae5e2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4678,9 +4678,10 @@ static void wake_all_kswapds(unsigned int order, gfp_t gfp_mask,
 
 	for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, highest_zoneidx,
 					ac->nodemask) {
-		if (last_pgdat != zone->zone_pgdat)
+		if (last_pgdat != zone->zone_pgdat) {
 			wakeup_kswapd(zone, gfp_mask, order, highest_zoneidx);
-		last_pgdat = zone->zone_pgdat;
+			last_pgdat = zone->zone_pgdat;
+		}
 	}
 }