linux-kernel - Re: [PATCH] mm/huge_memory: softleaf device private fixes in remove_migration

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Message-ID: <4e6286a6-721d-45cd-a4ea-e79e90e14fc7@kernel.org>
Date: Wed, 12 Nov 2025 12:37:50 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: Balbir Singh <balbirs@...dia.com>, linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Zi Yan <ziy@...dia.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>
Subject: Re: [PATCH] mm/huge_memory: softleaf device private fixes in
 remove_migration_pmd()

On 12.11.25 05:46, Balbir Singh wrote:
> commit a6ca2ba46390 ("mm: replace pmd_to_swp_entry() with softleaf_from_pmd()")

So should this be squashed into Lorenzo patch, or incorporated in his 
series in case he has to resend?

> does not work with device private THP entries. softleaf_is_migration_young()
> asserts that the entry be a migration entry, but in the current code, the
> entry might already be replaced by a device private entry by the time the
> check is made. The issue exists with commit
> 7385dbdbf841 ("mm/rmap: extend rmap and migration support device-private entries")
> 

Because this confuses me. If it's already a problem in the 
commit-to-go-upstream-first, it should be fixed in that commit?

-- 
Cheers

David