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

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Message-ID: <l264zv6qfnvzhfdiwe3nzjydqz7w4t3ddumntopdq6qmyx4ktk@svdhieca6abe>
Date: Wed, 29 Oct 2025 10:23:06 +0000
From: Kiryl Shutsemau <kirill@...temov.name>
To: Hugh Dickins <hughd@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, 
	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, Oct 29, 2025 at 02:45:52AM -0700, Hugh Dickins wrote:
> On Tue, 28 Oct 2025, Kiryl Shutsemau wrote:
> > 
> > > Also, is [2/2] to be backported?  The changelog makes it sound that way,
> > > but no Fixes: was identified?
> > 
> > Looking at split-on-truncate history, looks like this is the right
> > commit to point to:
> > 
> > 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")

Good point.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov