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

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Message-ID: <cc49661d-c3ea-44c6-9af5-cda4bd102d25@nvidia.com>
Date: Mon, 8 Sep 2025 10:12:00 -0700
From: John Hubbard <jhubbard@...dia.com>
To: David Hildenbrand <david@...hat.com>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
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,
 iommu@...ts.linux.dev, io-uring@...r.kernel.org,
 Jason Gunthorpe <jgg@...dia.com>, Jens Axboe <axboe@...nel.dk>,
 Johannes Weiner <hannes@...xchg.org>, 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,
 linux-ide@...r.kernel.org, linux-kselftest@...r.kernel.org,
 linux-mips@...r.kernel.org, linux-mmc@...r.kernel.org, linux-mm@...ck.org,
 linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
 linux-scsi@...r.kernel.org, Marco Elver <elver@...gle.com>,
 Marek Szyprowski <m.szyprowski@...sung.com>, Michal Hocko <mhocko@...e.com>,
 Mike Rapoport <rppt@...nel.org>, Muchun Song <muchun.song@...ux.dev>,
 netdev@...r.kernel.org, Oscar Salvador <osalvador@...e.de>,
 Peter Xu <peterx@...hat.com>, Robin Murphy <robin.murphy@....com>,
 Suren Baghdasaryan <surenb@...gle.com>, Tejun Heo <tj@...nel.org>,
 virtualization@...ts.linux.dev, 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 9/8/25 5:53 AM, David Hildenbrand wrote:
> On 08.09.25 14:25, Lorenzo Stoakes wrote:
>> On Sat, Sep 06, 2025 at 08:56:48AM +0200, David Hildenbrand wrote:
>>> On 06.09.25 03:05, John Hubbard wrote:
...
>>> Roughly, what I am thinking (limiting it to pte+pmd case) about is 
>>> the following:
>>
>> I cannot get the below to apply even with the original patch here 
>> applied + fix.
>>
>> It looks like (in mm-new :) commit e73f43a66d5f ("mm/gup: remove dead 
>> pgmap
>> refcounting code") by Alastair has conflicted here, but even then I 
>> can't make
>> it apply, with/without your fix...!

I eventually resorted to telling the local AI to read the diffs and
apply them on top of the nth_page series locally. :) Attaching the
resulting patch, which worked well enough to at least see the proposal
clearly.

> 
> To be clear: it was never intended to be applied, because it wouldn't 
> even compile in the current form.
> 
> It was based on this nth_page submission + fix.
> 
> thanks,
-- 
John Hubbard

View attachment "0001-David-Hildenbrand-s-fix-for-record_subpages.patch" of type "text/x-patch" (5603 bytes)