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Mon, 2 Feb 2026 10:57:56 -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 , Huacai Chen , WANG Xuerui , Palmer Dabbelt , Paul Walmsley , Albert Ou , Alexandre Ghiti , kernel-team@meta.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, loongarch@lists.linux.dev, linux-riscv@lists.infradead.org, Kiryl Shutsemau Subject: [PATCHv6 09/17] mm/sparse: Check memmap alignment for compound_info_has_mask() Date: Mon, 2 Feb 2026 15:56:25 +0000 Message-ID: <20260202155634.650837-10-kas@kernel.org> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20260202155634.650837-1-kas@kernel.org> References: <20260202155634.650837-1-kas@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: B133110001B X-Stat-Signature: aqmujc63rmpa6ma1mcztixbxjxf8asym X-Rspam-User: X-HE-Tag: 1770047880-134305 X-HE-Meta: U2FsdGVkX1+CRnhnhw5dhtQ9wqNSBZmeL9YiTlBieotIdpQZm2xkDf4HhSn6rYobAWdjLswB13hVGnMSVSgciZHlZ9xSr3srh6mPi4iIr0NQmb+QVkxL4MEsytRNuiCymXvOOthtTycw3L50ThSKGalJXz136ewcNmm5tqHWZUY0I/h1vcprJ0cb0l2AdCx5g94a+Afc5wSGweJybNbV8HAtLO4KdNMwAG3Tri8nQSW8KALMy8ryFdsXB5RtTonWL+CK836xKZMQzJh49ot92QA/r2gMQTQxTNhrhseUwFJ5ZooeQnQSy4VQ22CGsl0H9nFkW0UsD/duBLwA2/FfkipXrEjirkUTi0C+5OzWXh41vm6q3tRoBII2REkhP/1bPUY4WPGnj4iA9EIcYkrtoG9/a4oI1TSqn71ijsEyqvzZLc9C0yxXyLGdnZaXI+NxiW9yaXxlNGsFwl3d+3J0M4Q3wl9/9OqzjbEPd+6ihu2bjoZlSS+662FlBpKm/jdmmyjj6Uc/WCEYhEBZvCr/T+R0/iDStIhpZUop4wkrOwiKl70SRjZLMLal/fSgZB9yjs5exBD0EZy5Mgm6t2T1g0AxcTRjLeS7cVoBiFZEudXbsl9a9TpMDFQjgemNzICIaSp5NRp6GgFSOdrmfBs0rtBeIwvUQ1Y1C48Yy9XPGB1CNCIXWQBpXXMjRSO5jDN2xxKz6INIgOb9OcJXzOWFXrPsy0WSbkzzfyRNW1m0q1FoOZg7q2rMHoaEn4AEY2BZ65xqcMWuTKFHBDSwFKtDHpduQvxg1U8oanLOj8a86q/OlPIXfZSdnDHUBpoz0B4l3dEsLXFO+vDa+x4vUJwjbUhk6JmASjqyzG+ZFU7QARt+AJ1H7dYOT5XI+wMxo/dJ+X/P88x7JwB1PvaSyaehDWl1LSc/qgO4XwYtYjTV/6n+rI7AaWHqLk6BfZCsHtER5cvitD3DBafJjNSmxTY BgyGXLWy nWykJyCE86GNQgmUndL19WTBwaFxOxaHFWmms2uXaYCe74EfCr5gxL9RC41v3t8NINMmNgY+Q38ShzPjyh648BIXEvPV12xm8O4buVwOfmyg6w2U33WrlBzWfgAJ3GQ//GhgzqwoVUD2ousidTcMNKpG0DUghemCfH77QzXkOEWxqhNscDcwD+CIg0sAAx+AC0uwXLJKufPQaxJjAHOlU3QIkJ/fxB+o/HPgioyjkPGRh+xMSRCEmafN9V+HjnDeke9Gvlqs7RuaAhyQDIOP5Oosai11baV9JYHmDqy586VJ3OWk1ClQ0rwD5xdMaBdbgrbws3RNHpIe+Xm4= 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 vmemmap to be naturally aligned to the maximum folio size. Add a VM_BUG_ON() to check the alignment. Signed-off-by: Kiryl Shutsemau Acked-by: Zi Yan --- mm/sparse.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/sparse.c b/mm/sparse.c index b5b2b6f7041b..6c9b62607f3f 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -600,6 +600,13 @@ void __init sparse_init(void) BUILD_BUG_ON(!is_power_of_2(sizeof(struct mem_section))); memblocks_present(); + if (compound_info_has_mask()) { + unsigned long alignment; + + alignment = MAX_FOLIO_NR_PAGES * sizeof(struct page); + VM_BUG_ON(!IS_ALIGNED((unsigned long) pfn_to_page(0), alignment)); + } + pnum_begin = first_present_section_nr(); nid_begin = sparse_early_nid(__nr_to_section(pnum_begin)); -- 2.51.2