Re: [PATCH v2 19/37] mm/gup: remove record_subpages()

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To: John Hubbard <jhubbard@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx
Subject: Re: [PATCH v2 19/37] mm/gup: remove record_subpages()
From: David Hildenbrand <david@xxxxxxxxxx>
Date: Mon, 8 Sep 2025 10:00:05 +0200
Cc: Alexander Potapenko <glider@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Brendan Jackman <jackmanb@xxxxxxxxxx>, Christoph Lameter <cl@xxxxxxxxxx>, Dennis Zhou <dennis@xxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>, dri-devel@xxxxxxxxxxxxxxxxxxxxx, intel-gfx@xxxxxxxxxxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxx, io-uring@xxxxxxxxxxxxxxx, Jason Gunthorpe <jgg@xxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Johannes Weiner <hannes@xxxxxxxxxxx>, kasan-dev@xxxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, linux-arm-kernel@xxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-crypto@xxxxxxxxxxxxxxx, linux-ide@xxxxxxxxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxxx, linux-mmc@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>, Marco Elver <elver@xxxxxxxxxx>, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxx>, Muchun Song <muchun.song@xxxxxxxxx>, netdev@xxxxxxxxxxxxxxx, Oscar Salvador <osalvador@xxxxxxx>, Peter Xu <peterx@xxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, Suren Baghdasaryan <surenb@xxxxxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, virtualization@xxxxxxxxxxxxxxx, Vlastimil Babka <vbabka@xxxxxxx>, wireguard@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, Zi Yan <ziy@xxxxxxxxxx>, Aristeu Rozanski <aris@xxxxxxxxxx>
In-reply-to: <0a28adde-acaf-4d55-96ba-c32d6113285f@nvidia.com>
References: <20250901150359.867252-1-david@redhat.com> <20250901150359.867252-20-david@redhat.com> <016307ba-427d-4646-8e4d-1ffefd2c1968@nvidia.com> <85e760cf-b994-40db-8d13-221feee55c60@redhat.com> <0a28adde-acaf-4d55-96ba-c32d6113285f@nvidia.com>
User-agent: Mozilla Thunderbird

Roughly, what I am thinking (limiting it to pte+pmd case) about is the
following:


The code below looks much cleaner, that's great!


Great, I (or Aristeu if he has capacity) will clean this all up soon.

--
Cheers

David / dhildenb

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References:
- [PATCH v2 19/37] mm/gup: remove record_subpages()
  - From: David Hildenbrand
- Re: [PATCH v2 19/37] mm/gup: remove record_subpages()
  - From: John Hubbard
- Re: [PATCH v2 19/37] mm/gup: remove record_subpages()
  - From: David Hildenbrand
- Re: [PATCH v2 19/37] mm/gup: remove record_subpages()
  - From: John Hubbard

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