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

[Wei Yang <richard.weiyang@xxxxxxxxx>]

On Thu, Apr 07, 2022 at 11:46:13AM +0200, 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-G??recki <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.
>
>Acked-by: David Hildenbrand <david@xxxxxxxxxx>

Ok, I see the point.

Reviewed-by: Wei Yang <richard.weiyang@xxxxxxxxx>

>
>-- 
>Thanks,
>
>David / dhildenb

-- 
Wei Yang
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