linux-kernel - Re: [PATCH RFC 06/35] mm/page_alloc: reject unreasonable folio/compound page sizes in alloc_contig_range

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Message-ID: <E2F739EA-4779-4C4C-B4BE-76AC64B42EAF@nvidia.com>
Date: Thu, 21 Aug 2025 16:23:05 -0400
From: Zi Yan <ziy@...dia.com>
To: David Hildenbrand <david@...hat.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,
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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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 Michal Hocko <mhocko@...e.com>, Mike Rapoport <rppt@...nel.org>,
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 Vlastimil Babka <vbabka@...e.cz>, wireguard@...ts.zx2c4.com, x86@...nel.org
Subject: Re: [PATCH RFC 06/35] mm/page_alloc: reject unreasonable
 folio/compound page sizes in alloc_contig_range_noprof()

On 21 Aug 2025, at 16:06, 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.
>
> Signed-off-by: David Hildenbrand <david@...hat.com>
> ---
>  include/linux/mm.h | 6 ++++--
>  mm/page_alloc.c    | 5 ++++-
>  2 files changed, 8 insertions(+), 3 deletions(-)
>

LGTM. Reviewed-by: Zi Yan <ziy@...dia.com>

Best Regards,
Yan, Zi