linux-kernel - Re: [PATCHv3 1/2] mm/memory: Do not populate page table entries beyond i

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Message-Id: <20251031211749.e8729676c0ca40c8d6b95166@linux-foundation.org>
Date: Fri, 31 Oct 2025 21:17:49 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Hugh Dickins <hughd@...gle.com>
Cc: Kiryl Shutsemau <kirill@...temov.name>, David Hildenbrand
 <david@...hat.com>, Matthew Wilcox <willy@...radead.org>, Alexander Viro
 <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>, Lorenzo
 Stoakes <lorenzo.stoakes@...cle.com>, "Liam R. Howlett"
 <Liam.Howlett@...cle.com>, Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport
 <rppt@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko
 <mhocko@...e.com>, Rik van Riel <riel@...riel.com>, Harry Yoo
 <harry.yoo@...cle.com>, Johannes Weiner <hannes@...xchg.org>, Shakeel Butt
 <shakeel.butt@...ux.dev>, Baolin Wang <baolin.wang@...ux.alibaba.com>,
 "Darrick J. Wong" <djwong@...nel.org>, Dave Chinner <david@...morbit.com>,
 linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3 1/2] mm/memory: Do not populate page table entries
 beyond i_size

On Wed, 29 Oct 2025 02:45:52 -0700 (PDT) Hugh Dickins <hughd@...gle.com> wrote:

> > Fixes: b9a8a4195c7d ("truncate,shmem: Handle truncates that split large folios")
> 
> I agree that's the right Fixee for 2/2: the one which introduced
> splitting a large folio to non-shmem filesystems in 5.17.
> 
> But you're giving yourself too hard a time of backporting with your
> 5.10 Fixee 01c70267053d for 1/2: the only filesystem which set the
> flag then was tmpfs, which you're now excepting.  The flag got
> renamed later (in 5.16) and then in 5.17 at last there was another
> filesystem to set it.  So, this 1/2 would be
> 
> Fixes: 6795801366da ("xfs: Support large folios")

I updated the changelog in mm.git's copy of this patch, thanks.