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

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Message-ID: <20251106014443.wkurq6p7ofhsffkn@master>
Date: Thu, 6 Nov 2025 01:44:43 +0000
From: Wei Yang <richard.weiyang@...il.com>
To: Zi Yan <ziy@...dia.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...nel.org>,
	Wei Yang <richard.weiyang@...il.com>,
	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 Wed, Nov 05, 2025 at 11:29:10AM -0500, Zi Yan wrote:
>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>

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

-- 
Wei Yang
Help you, Help me