From 84caf98838a3e5f4bdb344c13679e1067ffbf094 Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Fri, 4 Jul 2025 12:25:13 +0200 Subject: mm: stop storing migration_ops in page->mapping MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit ... instead, look them up statically based on the page type. Maybe in the future we want a registration interface? At least for now, it can be easily handled using the two page types that actually support page migration. The remaining usage of page->mapping is to flag such pages as actually being movable (having movable_ops), which we will change next. Link: https://lkml.kernel.org/r/20250704102524.326966-20-david@redhat.com Signed-off-by: David Hildenbrand Reviewed-by: Zi Yan Reviewed-by: Lorenzo Stoakes Reviewed-by: Harry Yoo Cc: Alistair Popple Cc: Al Viro Cc: Arnd Bergmann Cc: Brendan Jackman Cc: Byungchul Park Cc: Chengming Zhou Cc: Christian Brauner Cc: Christophe Leroy Cc: Eugenio Pé rez Cc: Greg Kroah-Hartman Cc: Gregory Price Cc: "Huang, Ying" Cc: Jan Kara Cc: Jason Gunthorpe Cc: Jason Wang Cc: Jerrin Shaji George Cc: Johannes Weiner Cc: John Hubbard Cc: Jonathan Corbet Cc: Joshua Hahn Cc: Liam Howlett Cc: Madhavan Srinivasan Cc: Mathew Brost Cc: Matthew Wilcox (Oracle) Cc: Miaohe Lin Cc: Michael Ellerman Cc: "Michael S. Tsirkin" Cc: Michal Hocko Cc: Mike Rapoport Cc: Minchan Kim Cc: Naoya Horiguchi Cc: Nicholas Piggin Cc: Oscar Salvador Cc: Peter Xu Cc: Qi Zheng Cc: Rakie Kim Cc: Rik van Riel Cc: Sergey Senozhatsky Cc: Shakeel Butt Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Xuan Zhuo Cc: xu xin Signed-off-by: Andrew Morton --- include/linux/balloon_compaction.h | 2 +- include/linux/migrate.h | 14 ++------------ include/linux/zsmalloc.h | 2 ++ 3 files changed, 5 insertions(+), 13 deletions(-) (limited to 'include/linux') diff --git a/include/linux/balloon_compaction.h b/include/linux/balloon_compaction.h index 9bce8e9f5018..a8a1706cc56f 100644 --- a/include/linux/balloon_compaction.h +++ b/include/linux/balloon_compaction.h @@ -92,7 +92,7 @@ static inline void balloon_page_insert(struct balloon_dev_info *balloon, struct page *page) { __SetPageOffline(page); - __SetPageMovable(page, &balloon_mops); + __SetPageMovable(page); set_page_private(page, (unsigned long)balloon); list_add(&page->lru, &balloon->pages); } diff --git a/include/linux/migrate.h b/include/linux/migrate.h index e04035f70e36..6aece3f3c8be 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -104,23 +104,13 @@ static inline int migrate_huge_page_move_mapping(struct address_space *mapping, #endif /* CONFIG_MIGRATION */ #ifdef CONFIG_COMPACTION -void __SetPageMovable(struct page *page, const struct movable_operations *ops); +void __SetPageMovable(struct page *page); #else -static inline void __SetPageMovable(struct page *page, - const struct movable_operations *ops) +static inline void __SetPageMovable(struct page *page) { } #endif -static inline -const struct movable_operations *page_movable_ops(struct page *page) -{ - VM_WARN_ON_ONCE_PAGE(!page_has_movable_ops(page), page); - - return (const struct movable_operations *) - ((unsigned long)page->mapping - PAGE_MAPPING_MOVABLE); -} - #ifdef CONFIG_NUMA_BALANCING int migrate_misplaced_folio_prepare(struct folio *folio, struct vm_area_struct *vma, int node); diff --git a/include/linux/zsmalloc.h b/include/linux/zsmalloc.h index 13e9cc5490f7..f3ccff2d966c 100644 --- a/include/linux/zsmalloc.h +++ b/include/linux/zsmalloc.h @@ -46,4 +46,6 @@ void zs_obj_read_end(struct zs_pool *pool, unsigned long handle, void zs_obj_write(struct zs_pool *pool, unsigned long handle, void *handle_mem, size_t mem_len); +extern const struct movable_operations zsmalloc_mops; + #endif -- cgit v1.2.3