Re: [PATCH v1 06/36] mm/page_alloc: reject unreasonable folio/compound page sizes in alloc_contig_range_noprof()

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To: David Hildenbrand <david@xxxxxxxxxx>
Subject: Re: [PATCH v1 06/36] mm/page_alloc: reject unreasonable folio/compound page sizes in alloc_contig_range_noprof()
From: Wei Yang <richard.weiyang@xxxxxxxxx>
Date: Thu, 28 Aug 2025 07:31:50 +0000
Cc: linux-kernel@xxxxxxxxxxxxxxx, Zi Yan <ziy@xxxxxxxxxx>, SeongJae Park <sj@xxxxxxxxxx>, 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>, John Hubbard <jhubbard@xxxxxxxxxx>, 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
In-reply-to: <20250827220141.262669-7-david@redhat.com>
References: <20250827220141.262669-1-david@redhat.com> <20250827220141.262669-7-david@redhat.com>
Reply-to: Wei Yang <richard.weiyang@xxxxxxxxx>
User-agent: NeoMutt/20170113 (1.7.2)

On Thu, Aug 28, 2025 at 12:01:10AM +0200, David Hildenbrand wrote:
>Let's reject them early, which in turn makes folio_alloc_gigantic() reject
>them properly.
>
>To avoid converting from order to nr_pages, let's just add MAX_FOLIO_ORDER
>and calculate MAX_FOLIO_NR_PAGES based on that.
>
>Reviewed-by: Zi Yan <ziy@xxxxxxxxxx>
>Acked-by: SeongJae Park <sj@xxxxxxxxxx>
>Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>

Reviewed-by: Wei Yang <richard.weiyang@xxxxxxxxx>

-- 
Wei Yang
Help you, Help me

References:
- [PATCH v1 00/36] mm: remove nth_page()
  - From: David Hildenbrand
- [PATCH v1 06/36] mm/page_alloc: reject unreasonable folio/compound page sizes in alloc_contig_range_noprof()
  - From: David Hildenbrand

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