linux-kernel - [PATCH] mm, page_alloc: fix build_zonerefs

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Date:   Thu,  7 Apr 2022 11:32:21 +0200
From:   Juergen Gross <jgross@...e.com>
To:     xen-devel@...ts.xenproject.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Juergen Gross <jgross@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        stable@...r.kernel.org,
        Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>
Subject: [PATCH] mm, page_alloc: fix build_zonerefs_node()

Since commit 9d3be21bf9c0 ("mm, page_alloc: simplify zonelist
initialization") only zones with free memory are included in a built
zonelist. This is problematic when e.g. all memory of a zone has been
ballooned out.

Use populated_zone() when building a zonelist as it has been done
before that commit.

Cc: stable@...r.kernel.org
Fixes: 9d3be21bf9c0 ("mm, page_alloc: simplify zonelist initialization")
Reported-by: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com>
Signed-off-by: Juergen Gross <jgross@...e.com>
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index bdc8f60ae462..3d0662af3289 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6128,7 +6128,7 @@ static int build_zonerefs_node(pg_data_t *pgdat, struct zoneref *zonerefs)
 	do {
 		zone_type--;
 		zone = pgdat->node_zones + zone_type;
-		if (managed_zone(zone)) {
+		if (populated_zone(zone)) {
 			zoneref_set_zone(zone, &zonerefs[nr_zones++]);
 			check_highest_zone(zone_type);
 		}
-- 
2.34.1