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Wed, 21 Jan 2026 11:22:57 -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 01/14] mm: Move MAX_FOLIO_ORDER definition to mmzone.h Date: Wed, 21 Jan 2026 16:22:38 +0000 Message-ID: <20260121162253.2216580-2-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-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: B5EB9140013 X-Stat-Signature: qab7idxz7gi4tb6dfm7coe7dymt5ip9n X-Rspam-User: X-HE-Tag: 1769012580-191727 X-HE-Meta: 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 rPDPq+4B LdAataUcetL2AVo9kh74IlDnE3eDA86ehU0BVK7TxoCnvdqulo7Dn4WouOvP4/tWsHfyiCSi1i2G95rWXS9sBd+Yr1JdnuSB+L0faZQ+qzs6yzEANKlag/Ac8jIKZ5I2Weql02Rtyfk6bJybvkLU8P8uH1QEKZwJ5tgQxFgacjn8DdYckPwYxWfVdAJcERM6EsKa2GbIEuzBbGAcqc8nI455ttD1gNfOirBuvMR/driOmT6jn0B326+jw2TvmrsS0YUgOFImX9psnzKGknT7FJkD4guoDIS6bGpRUl6hFppXxoq+Kkr982d4douVWvjkKBN+fMJQMbgnjlzZXsvSnAuqTjg== 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: Move MAX_FOLIO_ORDER definition from mm.h to mmzone.h. This is preparation for adding the vmemmap_tails array to struct pglist_data, which requires MAX_FOLIO_ORDER to be available in mmzone.h. Signed-off-by: Kiryl Shutsemau Acked-by: David Hildenbrand (Red Hat) --- include/linux/mm.h | 31 ------------------------------- include/linux/mmzone.h | 31 +++++++++++++++++++++++++++++++ 2 files changed, 31 insertions(+), 31 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 7c79b3369b82..2c409f583569 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -26,7 +26,6 @@ #include #include #include -#include #include #include #include @@ -2074,36 +2073,6 @@ static inline unsigned long folio_nr_pages(const struct folio *folio) return folio_large_nr_pages(folio); } -#if !defined(CONFIG_HAVE_GIGANTIC_FOLIOS) -/* - * We don't expect any folios that exceed buddy sizes (and consequently - * memory sections). - */ -#define MAX_FOLIO_ORDER MAX_PAGE_ORDER -#elif defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) -/* - * Only pages within a single memory section are guaranteed to be - * contiguous. By limiting folios to a single memory section, all folio - * pages are guaranteed to be contiguous. - */ -#define MAX_FOLIO_ORDER PFN_SECTION_SHIFT -#elif defined(CONFIG_HUGETLB_PAGE) -/* - * There is no real limit on the folio size. We limit them to the maximum we - * currently expect (see CONFIG_HAVE_GIGANTIC_FOLIOS): with hugetlb, we expect - * no folios larger than 16 GiB on 64bit and 1 GiB on 32bit. - */ -#define MAX_FOLIO_ORDER get_order(IS_ENABLED(CONFIG_64BIT) ? SZ_16G : SZ_1G) -#else -/* - * Without hugetlb, gigantic folios that are bigger than a single PUD are - * currently impossible. - */ -#define MAX_FOLIO_ORDER PUD_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/include/linux/mmzone.h b/include/linux/mmzone.h index 7fb7331c5725..6cfede39570a 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -23,6 +23,7 @@ #include #include #include +#include #include /* Free memory management - zoned buddy allocator. */ @@ -61,6 +62,36 @@ */ #define PAGE_ALLOC_COSTLY_ORDER 3 +#if !defined(CONFIG_HAVE_GIGANTIC_FOLIOS) +/* + * We don't expect any folios that exceed buddy sizes (and consequently + * memory sections). + */ +#define MAX_FOLIO_ORDER MAX_PAGE_ORDER +#elif defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) +/* + * Only pages within a single memory section are guaranteed to be + * contiguous. By limiting folios to a single memory section, all folio + * pages are guaranteed to be contiguous. + */ +#define MAX_FOLIO_ORDER PFN_SECTION_SHIFT +#elif defined(CONFIG_HUGETLB_PAGE) +/* + * There is no real limit on the folio size. We limit them to the maximum we + * currently expect (see CONFIG_HAVE_GIGANTIC_FOLIOS): with hugetlb, we expect + * no folios larger than 16 GiB on 64bit and 1 GiB on 32bit. + */ +#define MAX_FOLIO_ORDER get_order(IS_ENABLED(CONFIG_64BIT) ? SZ_16G : SZ_1G) +#else +/* + * Without hugetlb, gigantic folios that are bigger than a single PUD are + * currently impossible. + */ +#define MAX_FOLIO_ORDER PUD_ORDER +#endif + +#define MAX_FOLIO_NR_PAGES (1UL << MAX_FOLIO_ORDER) + enum migratetype { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, -- 2.51.2