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Wed, 21 Jan 2026 11:23:10 -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: [PATCHv4 07/14] mm/sparse: Check memmap alignment for compound_info_has_mask() Date: Wed, 21 Jan 2026 16:22:44 +0000 Message-ID: <20260121162253.2216580-8-kas@kernel.org> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20260121162253.2216580-1-kas@kernel.org> References: <20260121162253.2216580-1-kas@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 7dsn7igkeymfe3cfe66ququ5gffe1js7 X-Rspam-User: X-Rspamd-Queue-Id: 6ACF540016 X-Rspamd-Server: rspam10 X-HE-Tag: 1769012593-577385 X-HE-Meta: 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 ZsO5I4n+ qWlghK4//OSGDm+dLG4zXJwNrIIg+07Eh8KUpXZVGw++QzHfges5sfMZqCc42aPr9gW+xMV96OwcM0FOGJn8TZZjSCdE+SW0Ec0SXDN+SMLYmlCXgMBCJ0lGm/nLGM4RPpmNJBOAEIlOoj1Wb7YgDvzAG/m7ZpV7eznreGxbC5wyPXvUaA9kzg4cTvP+8xUx35crjkA7VYBKFobSyVKL4/l7H3nGsPa6bd8eNrjTPFjzduBMor2qdvJZCoZz66gVHi3G2NYOCMhOZkrKVOh3GhILGnEA1nDI8Tt3bwtIRgw70fdcSL8L/59pI4odVlFEu5zRWR1NSB3zwoP6m6n/prAwwMA== 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 390ce11b3765..7e4f69b9d760 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -91,6 +91,7 @@ #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