linux-kernel - Re: [PATCH] mm/huge_memory: fix folio split check for anon folios in swapcache.

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Message-ID: <cb1d2b13-6eb0-466b-a541-0d97940fc184@kernel.org>
Date: Wed, 5 Nov 2025 17:31:19 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: Zi Yan <ziy@...dia.com>, Andrew Morton <akpm@...ux-foundation.org>,
 Wei Yang <richard.weiyang@...il.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, Nico Pache <npache@...hat.com>,
 Ryan Roberts <ryan.roberts@....com>, Dev Jain <dev.jain@....com>,
 Barry Song <baohua@...nel.org>, Lance Yang <lance.yang@...ux.dev>,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] mm/huge_memory: fix folio split check for anon folios in
 swapcache.

On 05.11.25 17:29, Zi Yan wrote:

Nit: drop trailing "." in subject.

I'm sure Andrew can fix that up :)

> Both uniform and non uniform split check missed the check to prevent
> splitting anon folios in swapcache to non-zero order. Fix the check.
> 
> Fixes: 58729c04cf10 ("mm/huge_memory: add buddy allocator like (non-uniform) folio_split()")
> Reported-by: "David Hildenbrand (Red Hat)" <david@...nel.org>
> Closes: https://lore.kernel.org/all/dc0ecc2c-4089-484f-917f-920fdca4c898@kernel.org/
> Cc: stable@...r.kernel.org
> Signed-off-by: Zi Yan <ziy@...dia.com>
> ---

Thanks!

Acked-by: David Hildenbrand (Red Hat) <david@...nel.org>

-- 
Cheers

David