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Howlett" , linux-kernel@vger.kernel.org, Zi Yan , SeongJae Park , Alexander Potapenko , Andrew Morton , Brendan Jackman , Christoph Lameter , Dennis Zhou , Dmitry Vyukov , dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, iommu@lists.linux.dev, io-uring@vger.kernel.org, Jason Gunthorpe , Jens Axboe , Johannes Weiner , John Hubbard , kasan-dev@googlegroups.com, kvm@vger.kernel.org, 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 References: <20250827220141.262669-1-david@redhat.com> <20250827220141.262669-7-david@redhat.com> <3hpjmfa6p3onfdv4ma4nv2tdggvsyarh7m36aufy6hvwqtp2wd@2odohwxkl3rk> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 6C3D140004 X-Stat-Signature: yy1gt3n6yd3twph6ua6m6s1i96hupiks X-HE-Tag: 1756461536-893192 X-HE-Meta: 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 pv5PBwgK 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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 29.08.25 02:33, Liam R. Howlett wrote: > * David Hildenbrand [250827 18:04]: >> 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 >> Acked-by: SeongJae Park >> Signed-off-by: David Hildenbrand > > Nit below, but.. > > Reviewed-by: Liam R. Howlett > >> --- >> include/linux/mm.h | 6 ++++-- >> mm/page_alloc.c | 5 ++++- >> 2 files changed, 8 insertions(+), 3 deletions(-) >> >> diff --git a/include/linux/mm.h b/include/linux/mm.h >> index 00c8a54127d37..77737cbf2216a 100644 >> --- a/include/linux/mm.h >> +++ b/include/linux/mm.h >> @@ -2055,11 +2055,13 @@ static inline long folio_nr_pages(const struct folio *folio) >> >> /* Only hugetlbfs can allocate folios larger than MAX_ORDER */ >> #ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE >> -#define MAX_FOLIO_NR_PAGES (1UL << PUD_ORDER) >> +#define MAX_FOLIO_ORDER PUD_ORDER >> #else >> -#define MAX_FOLIO_NR_PAGES MAX_ORDER_NR_PAGES >> +#define MAX_FOLIO_ORDER MAX_PAGE_ORDER >> #endif >> >> +#define MAX_FOLIO_NR_PAGES (1UL << MAX_FOLIO_ORDER) >> + >> /* >> * compound_nr() returns the number of pages in this potentially compound >> * page. compound_nr() can be called on a tail page, and is defined to >> diff --git a/mm/page_alloc.c b/mm/page_alloc.c >> index baead29b3e67b..426bc404b80cc 100644 >> --- a/mm/page_alloc.c >> +++ b/mm/page_alloc.c >> @@ -6833,6 +6833,7 @@ static int __alloc_contig_verify_gfp_mask(gfp_t gfp_mask, gfp_t *gfp_cc_mask) >> int alloc_contig_range_noprof(unsigned long start, unsigned long end, >> acr_flags_t alloc_flags, gfp_t gfp_mask) >> { >> + const unsigned int order = ilog2(end - start); >> unsigned long outer_start, outer_end; >> int ret = 0; >> >> @@ -6850,6 +6851,9 @@ int alloc_contig_range_noprof(unsigned long start, unsigned long end, >> PB_ISOLATE_MODE_CMA_ALLOC : >> PB_ISOLATE_MODE_OTHER; >> >> + if (WARN_ON_ONCE((gfp_mask & __GFP_COMP) && order > MAX_FOLIO_ORDER)) >> + return -EINVAL; >> + >> gfp_mask = current_gfp_context(gfp_mask); >> if (__alloc_contig_verify_gfp_mask(gfp_mask, (gfp_t *)&cc.gfp_mask)) >> return -EINVAL; >> @@ -6947,7 +6951,6 @@ int alloc_contig_range_noprof(unsigned long start, unsigned long end, >> free_contig_range(end, outer_end - end); >> } else if (start == outer_start && end == outer_end && is_power_of_2(end - start)) { >> struct page *head = pfn_to_page(start); >> - int order = ilog2(end - start); > > You have changed this from an int to a const unsigned int, which is > totally fine but it was left out of the change log. Considered to trivial to document, but I can add a sentence about that. > Probably not really > worth mentioning but curious why the change to unsigned here? orders are always unsigned, like folio_order(). Thanks! -- Cheers David / dhildenb