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

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Date:   Fri, 8 Apr 2022 23:21:29 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     Juergen Gross <jgross@...e.com>, xen-devel@...ts.xenproject.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        stable@...r.kernel.org,
        Marek Marczykowski-G??recki <marmarek@...isiblethingslab.com>,
        Michal Hocko <mhocko@...nel.org>,
        Wei Yang <richard.weiyang@...il.com>
Subject: Re: [PATCH] mm, page_alloc: fix build_zonerefs_node()

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@...r.kernel.org
>> Fixes: 9d3be21bf9c0 ("mm, page_alloc: simplify zonelist initialization")
>> Reported-by: Marek Marczykowski-G??recki <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);
>>  		}
>
>Let's see if we have to find another way to properly handle fadump.
>
>Acked-by: David Hildenbrand <david@...hat.com>

Ok, I see the point.

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

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

-- 
Wei Yang
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