linux-kernel - Re: [PATCH v2 19/37] mm/gup: remove record

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Message-ID: <83d3ef61-abc7-458d-b6ea-20094eeff6cd@redhat.com>
Date: Mon, 8 Sep 2025 17:22:24 +0200
From: David Hildenbrand <david@...hat.com>
To: Mark Brown <broonie@...nel.org>
Cc: linux-kernel@...r.kernel.org, Alexander Potapenko <glider@...gle.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Brendan Jackman <jackmanb@...gle.com>, Christoph Lameter <cl@...two.org>,
 Dennis Zhou <dennis@...nel.org>, Dmitry Vyukov <dvyukov@...gle.com>,
 dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
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 Jason Gunthorpe <jgg@...dia.com>, Jens Axboe <axboe@...nel.dk>,
 Johannes Weiner <hannes@...xchg.org>, John Hubbard <jhubbard@...dia.com>,
 kasan-dev@...glegroups.com, kvm@...r.kernel.org,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>, linux-arm-kernel@...s.com,
 linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
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 linux-scsi@...r.kernel.org, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
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 Vlastimil Babka <vbabka@...e.cz>, wireguard@...ts.zx2c4.com, x86@...nel.org,
 Zi Yan <ziy@...dia.com>
Subject: Re: [PATCH v2 19/37] mm/gup: remove record_subpages()

On 08.09.25 17:16, Mark Brown wrote:
> On Mon, Sep 01, 2025 at 05:03:40PM +0200, David Hildenbrand wrote:
>> We can just cleanup the code by calculating the #refs earlier,
>> so we can just inline what remains of record_subpages().
>>
>> Calculate the number of references/pages ahead of times, and record them
>> only once all our tests passed.
> 
> I'm seeing failures in kselftest-mm in -next on at least Raspberry Pi 4
> and Orion O6 which bisect to this patch.  I'm seeing a NULL pointer
> dereference during the GUP test (which isn't actually doing anything as
> I'm just using a standard defconfig rather than one with the mm
> fragment):

On which -next label are you on? next-20250908 should no longer have 
that commit.

-- 
Cheers

David / dhildenb