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Howlett" , Linus Torvalds , linux-arm-kernel@axis.com, linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linux-ide@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mips@vger.kernel.org, linux-mmc@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, Lorenzo Stoakes , Marco Elver , Marek Szyprowski , Michal Hocko , Mike Rapoport , Muchun Song , netdev@vger.kernel.org, Oscar Salvador , Peter Xu , Robin Murphy , Suren Baghdasaryan , Tejun Heo , virtualization@lists.linux.dev, Vlastimil Babka , wireguard@lists.zx2c4.com, x86@kernel.org Subject: Re: [PATCH RFC 11/35] mm: sanity-check maximum folio size in folio_set_order() Date: Thu, 21 Aug 2025 16:36:49 -0400 X-Mailer: MailMate (2.0r6272) Message-ID: <5566D681-ED92-41A8-AF46-216AC8F62174@nvidia.com> In-Reply-To: <20250821200701.1329277-12-david@redhat.com> References: <20250821200701.1329277-1-david@redhat.com> 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 XaTJOPar 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 21 Aug 2025, at 16:06, David Hildenbrand wrote: > Let's sanity-check in folio_set_order() whether we would be trying to > create a folio with an order that would make it exceed MAX_FOLIO_ORDER. > > This will enable the check whenever a folio/compound page is initialized > through prepare_compound_head() / prepare_compound_page(). > > Signed-off-by: David Hildenbrand > --- > mm/internal.h | 1 + > 1 file changed, 1 insertion(+) > Reviewed-by: Zi Yan Best Regards, Yan, Zi