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Wed, 25 Feb 2026 08:34:48 -0800 (PST) Date: Wed, 25 Feb 2026 16:34:34 +0000 In-Reply-To: <20260225-page_alloc-unmapped-v1-0-e8808a03cd66@google.com> Mime-Version: 1.0 References: <20260225-page_alloc-unmapped-v1-0-e8808a03cd66@google.com> X-Mailer: b4 0.14.3 Message-ID: <20260225-page_alloc-unmapped-v1-9-e8808a03cd66@google.com> Subject: [PATCH RFC 09/19] mm: move migratetype definitions to freetype.h From: Brendan Jackman To: Borislav Petkov , Dave Hansen , Peter Zijlstra , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , Vlastimil Babka , Wei Xu , Johannes Weiner , Zi Yan Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, rppt@kernel.org, Sumit Garg , derkling@google.com, reijiw@google.com, Will Deacon , rientjes@google.com, "Kalyazin, Nikita" , patrick.roy@linux.dev, "Itazuri, Takahiro" , Andy Lutomirski , David Kaplan , Thomas Gleixner , Brendan Jackman , Yosry Ahmed Content-Type: text/plain; charset="utf-8" X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: EE315A0009 X-Stat-Signature: fuj7rw3tipiej8zwqh4org37tm73btjq X-HE-Tag: 1772037289-622512 X-HE-Meta: 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 ren9byO+ df4DN2iNHAQRBkk9qRDuhiFBjMCSBUGRk9hXtCZukaSuTUiikVOM0rXOKIBGtJS1UvGmYcI3NzMFE3fuKBAOgMtxTRq+ClEOcGdqt7wrDfvWcc4om+EYdKS0uZ63bzNLNZlC1VphHOX2th7rB19Wtfbc7Jva3ZXmcftknECn1g0hRpRwTmH3QTRMY+U+6zs/S1kmUX5xYFlAL6F3HZ0suZTLV+bpRfmZRVjR+Iz5PMrh8McDkbFZrDfQ9N9JLCBaYkSZGUYT4Il+/bYoKt+WpqYTGIgfw/bGUa9mQU3V560EeGdu5okoJ3RT/PfyUwyMo/HtM0imkh3UQ4cwQ+MLAbagsz6ADkulT5coJZCO7yvGOdo3QFZM6CiTukVs0CIIr/RsMV+bRHaea28ODnoqae0IC3/c9+5fBhAE46HhiI9MjIWf9Uwa6HZo0DvRCEdfO3PzllO5PByVvmqtZgseLpG9gFIXuhnxvPjNnpDLEZ+mAEiqlO5tPaO11vt/aKt6FNHLxtTndXsNCUB6PLXIMP/LeWQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Since migratetype are a sub-element of freetype, move the pure definitions into the new freetype.h. This will enable referring to these raw types from pageblock-flags.h. Signed-off-by: Brendan Jackman --- include/linux/freetype.h | 84 ++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/mmzone.h | 73 ----------------------------------------- 2 files changed, 84 insertions(+), 73 deletions(-) diff --git a/include/linux/freetype.h b/include/linux/freetype.h index 9f857d10bb5db..11bd6d2b94349 100644 --- a/include/linux/freetype.h +++ b/include/linux/freetype.h @@ -3,6 +3,66 @@ #define _LINUX_FREETYPE_H #include +#include + +/* + * A migratetype is the part of a freetype that encodes the mobility + * requirements for the allocations the freelist is intended to serve. + * + * It's also currently overloaded to encode page isolation state. + */ +enum migratetype { + MIGRATE_UNMOVABLE, + MIGRATE_MOVABLE, + MIGRATE_RECLAIMABLE, + MIGRATE_PCPTYPES, /* the number of types on the pcp lists */ + MIGRATE_HIGHATOMIC = MIGRATE_PCPTYPES, +#ifdef CONFIG_CMA + /* + * MIGRATE_CMA migration type is designed to mimic the way + * ZONE_MOVABLE works. Only movable pages can be allocated + * from MIGRATE_CMA pageblocks and page allocator never + * implicitly change migration type of MIGRATE_CMA pageblock. + * + * The way to use it is to change migratetype of a range of + * pageblocks to MIGRATE_CMA which can be done by + * __free_pageblock_cma() function. + */ + MIGRATE_CMA, + __MIGRATE_TYPE_END = MIGRATE_CMA, +#else + __MIGRATE_TYPE_END = MIGRATE_HIGHATOMIC, +#endif +#ifdef CONFIG_MEMORY_ISOLATION + MIGRATE_ISOLATE, /* can't allocate from here */ +#endif + MIGRATE_TYPES +}; + +/* In mm/page_alloc.c; keep in sync also with show_migration_types() there */ +extern const char * const migratetype_names[MIGRATE_TYPES]; + +#ifdef CONFIG_CMA +# define is_migrate_cma(migratetype) unlikely((migratetype) == MIGRATE_CMA) +#else +# define is_migrate_cma(migratetype) false +#endif + +static inline bool is_migrate_movable(int mt) +{ + return is_migrate_cma(mt) || mt == MIGRATE_MOVABLE; +} + +/* + * Check whether a migratetype can be merged with another migratetype. + * + * It is only mergeable when it can fall back to other migratetypes for + * allocation. See fallbacks[MIGRATE_TYPES][3] in page_alloc.c. + */ +static inline bool migratetype_is_mergeable(int mt) +{ + return mt < MIGRATE_PCPTYPES; +} /* * A freetype is the index used to identify free lists. This consists of a @@ -35,4 +95,28 @@ static inline bool freetypes_equal(freetype_t a, freetype_t b) return a.migratetype == b.migratetype; } +static inline freetype_t migrate_to_freetype(enum migratetype mt, + unsigned int flags) +{ + freetype_t freetype; + + /* No flags supported yet. */ + VM_WARN_ON_ONCE(flags); + + freetype.migratetype = mt; + return freetype; +} + +static inline enum migratetype free_to_migratetype(freetype_t freetype) +{ + return freetype.migratetype; +} + +/* Convenience helper, return the freetype modified to have the migratetype. */ +static inline freetype_t freetype_with_migrate(freetype_t freetype, + enum migratetype migratetype) +{ + return migrate_to_freetype(migratetype, freetype_flags(freetype)); +} + #endif /* _LINUX_FREETYPE_H */ diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 66a4cfc2afcb0..301328cbb8449 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -62,39 +62,7 @@ */ #define PAGE_ALLOC_COSTLY_ORDER 3 -enum migratetype { - MIGRATE_UNMOVABLE, - MIGRATE_MOVABLE, - MIGRATE_RECLAIMABLE, - MIGRATE_PCPTYPES, /* the number of types on the pcp lists */ - MIGRATE_HIGHATOMIC = MIGRATE_PCPTYPES, #ifdef CONFIG_CMA - /* - * MIGRATE_CMA migration type is designed to mimic the way - * ZONE_MOVABLE works. Only movable pages can be allocated - * from MIGRATE_CMA pageblocks and page allocator never - * implicitly change migration type of MIGRATE_CMA pageblock. - * - * The way to use it is to change migratetype of a range of - * pageblocks to MIGRATE_CMA which can be done by - * __free_pageblock_cma() function. - */ - MIGRATE_CMA, - __MIGRATE_TYPE_END = MIGRATE_CMA, -#else - __MIGRATE_TYPE_END = MIGRATE_HIGHATOMIC, -#endif -#ifdef CONFIG_MEMORY_ISOLATION - MIGRATE_ISOLATE, /* can't allocate from here */ -#endif - MIGRATE_TYPES -}; - -/* In mm/page_alloc.c; keep in sync also with show_migration_types() there */ -extern const char * const migratetype_names[MIGRATE_TYPES]; - -#ifdef CONFIG_CMA -# define is_migrate_cma(migratetype) unlikely((migratetype) == MIGRATE_CMA) # define is_migrate_cma_page(_page) (get_pageblock_migratetype(_page) == MIGRATE_CMA) /* * __dump_folio() in mm/debug.c passes a folio pointer to on-stack struct folio, @@ -103,27 +71,10 @@ extern const char * const migratetype_names[MIGRATE_TYPES]; # define is_migrate_cma_folio(folio, pfn) \ (get_pfnblock_migratetype(&folio->page, pfn) == MIGRATE_CMA) #else -# define is_migrate_cma(migratetype) false # define is_migrate_cma_page(_page) false # define is_migrate_cma_folio(folio, pfn) false #endif -static inline bool is_migrate_movable(int mt) -{ - return is_migrate_cma(mt) || mt == MIGRATE_MOVABLE; -} - -/* - * Check whether a migratetype can be merged with another migratetype. - * - * It is only mergeable when it can fall back to other migratetypes for - * allocation. See fallbacks[MIGRATE_TYPES][3] in page_alloc.c. - */ -static inline bool migratetype_is_mergeable(int mt) -{ - return mt < MIGRATE_PCPTYPES; -} - #define for_each_free_list(list, zone, order) \ for (order = 0; order < NR_PAGE_ORDERS; order++) \ for (unsigned int idx = 0; \ @@ -131,30 +82,6 @@ static inline bool migratetype_is_mergeable(int mt) idx < NR_FREETYPE_IDXS; \ idx++) -static inline freetype_t migrate_to_freetype(enum migratetype mt, - unsigned int flags) -{ - freetype_t freetype; - - /* No flags supported yet. */ - VM_WARN_ON_ONCE(flags); - - freetype.migratetype = mt; - return freetype; -} - -static inline enum migratetype free_to_migratetype(freetype_t freetype) -{ - return freetype.migratetype; -} - -/* Convenience helper, return the freetype modified to have the migratetype. */ -static inline freetype_t freetype_with_migrate(freetype_t freetype, - enum migratetype migratetype) -{ - return migrate_to_freetype(migratetype, freetype_flags(freetype)); -} - extern int page_group_by_mobility_disabled; freetype_t get_pfnblock_freetype(const struct page *page, unsigned long pfn); -- 2.51.2