Re: [PATCH] mm, page_alloc: fix build_zonerefs_node()

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On 07.04.22 11:46, David Hildenbrand wrote:
On 07.04.22 11:32, Juergen Gross wrote:
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@xxxxxxxxxxxxxxx
Fixes: 9d3be21bf9c0 ("mm, page_alloc: simplify zonelist initialization")
Reported-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
  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);
  		}

Let's see if we have to find another way to properly handle fadump.

TBH, I don't think this should matter here. A zone can always happen to
have no free memory left, so only handling this case when building the
zonelist can't be the full solution of that problem. It might trigger
a problem more easily, though.

Acked-by: David Hildenbrand <david@xxxxxxxxxx>

Thanks,


Juergen

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