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Thu, 15 Jan 2026 09:46:21 -0500 (EST) From: Kiryl Shutsemau To: Andrew Morton , Muchun Song , David Hildenbrand , Matthew Wilcox , Usama Arif , Frank van der Linden Cc: Oscar Salvador , Mike Rapoport , Vlastimil Babka , Lorenzo Stoakes , Zi Yan , Baoquan He , Michal Hocko , Johannes Weiner , Jonathan Corbet , kernel-team@meta.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Kiryl Shutsemau Subject: [PATCHv3 08/15] mm/sparse: Check memmap alignment for compound_info_has_mask() Date: Thu, 15 Jan 2026 14:45:54 +0000 Message-ID: <20260115144604.822702-9-kas@kernel.org> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20260115144604.822702-1-kas@kernel.org> References: <20260115144604.822702-1-kas@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 1710C140010 X-Stat-Signature: e5f7qehi9h4fgposjomhy4pcqsnpmqf1 X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1768488383-68069 X-HE-Meta: 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 plQ+WiaD b07cbP2cNOHz2dRDEL2L8D32HIPbsDnCzEtxLWC2Qp6LIMqHuNzcmYXKQEjiMy4JCciUJrMm4ujapjEg7H5GfaNAwuAcJGUkvo0eEBmTWA9OdKq0VSny9oMKIEYvHP36meLCijgptwCr/JXKbvAqNbhUA8tt4jjZhT8sOoz+omshWA8SW02nNSrq0N3Cag3ufaRV6mnLkm9ALw9dK/A/rs+t7aR+3RV8jUpyWmM6mrGCvQIYtrE5hhpTjXTtdOMnXAg+9r5XriCgt3a7DArlddQzZrBiH4Nw2CvX5h07AbCRZgm+WI5dsBSZbEY5kNEAcx3rdfvY0/fF/upumslb8dFysSQ== 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: If page->compound_info encodes a mask, it is expected that memmap to be naturally aligned to the maximum folio size. Add a warning if it is not. A warning is sufficient as MAX_FOLIO_ORDER is very rarely used, so the kernel is still likely to be functional if this strict check fails. Signed-off-by: Kiryl Shutsemau --- include/linux/mmzone.h | 1 + mm/sparse.c | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 590d1a494c4c..322ed4c42cfc 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -92,6 +92,7 @@ #endif #define MAX_FOLIO_NR_PAGES (1UL << MAX_FOLIO_ORDER) +#define MAX_FOLIO_SIZE (PAGE_SIZE << MAX_FOLIO_ORDER) enum migratetype { MIGRATE_UNMOVABLE, diff --git a/mm/sparse.c b/mm/sparse.c index 17c50a6415c2..5f41a3edcc24 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -600,6 +600,11 @@ void __init sparse_init(void) BUILD_BUG_ON(!is_power_of_2(sizeof(struct mem_section))); memblocks_present(); + if (compound_info_has_mask()) { + WARN_ON(!IS_ALIGNED((unsigned long)pfn_to_page(0), + MAX_FOLIO_SIZE / sizeof(struct page))); + } + pnum_begin = first_present_section_nr(); nid_begin = sparse_early_nid(__nr_to_section(pnum_begin)); -- 2.51.2