kernel/git/stable/linux.git/mm/hugetlb_cma.h, branch master

mm: add some missing includes to mm-local headers

2026-08-25T01:43:03+00:00

There are a number of internal headers local to mm/ which reference functions and data types without including the relevant headers. mm/vma.h is a special case that intentionally does not include additional headers, but the others are not. This breaks tooling like clangd (which is where I noticed this), though the build is OK due to the C files including the headers happening to include required dependencies. It's better to be explicit about dependencies anyway, so add the missing includes and fix clangd as a bonus. Link: https://lore.kernel.org/20260804-fix-some-local-headers-v1-1-a7beb173c116@kernel.org Signed-off-by: Lorenzo Stoakes (ARM) Acked-by: Vlastimil Babka (SUSE) Acked-by: David Hildenbrand (Arm) Acked-by: Zi Yan Reviewed-by: Barry Song Reviewed-by: Baoquan He Cc: Chris Li Cc: Johannes Weiner Cc: Kairui Song Cc: Kemeng Shi Cc: Liam R. Howlett Cc: Michal Hocko Cc: Mike Rapoport Cc: Muchun Song Cc: Nhat Pham Cc: Oscar Salvador Cc: Roman Gushchin Cc: Shakeel Butt Cc: Suren Baghdasaryan Cc: "Uladzislau Rezki (Sony)" Signed-off-by: Andrew Morton

mm/hugetlb: refactor early boot gigantic hugepage allocation

2026-07-29T04:11:59+00:00

The early boot gigantic hugepage allocation helpers currently mix allocation with huge_bootmem_page setup, and leave part of the initialization flow in architecture code. Refactor the interface to return the allocated huge page pointer and move the huge_bootmem_page setup into the generic hugetlb code. This makes the architecture-specific paths focus only on finding memory, while the common code handles node placement and early page metadata setup in one place. This also lets powerpc benefit from memblock_reserved_mark_noinit(), which it did not enable before. In addition, upcoming cross-zone validation for boot-time gigantic hugetlb reservation is common logic. With this refactoring, that logic can stay in the generic code instead of being duplicated in architecture-specific paths. Link: https://lore.kernel.org/20260612035903.2468601-14-songmuchun@bytedance.com Signed-off-by: Muchun Song Reviewed-by: Mike Rapoport (Microsoft) Reviewed-by: Oscar Salvador (SUSE) Cc: "Aneesh Kumar K.V" Cc: David Hildenbrand Cc: Frank van der Linden Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Oscar Salvador (SUSE) Cc: "Ritesh Harjani (IBM)" Cc: Usama Arif Cc: Vlastimil Babka Signed-off-by: Andrew Morton

mm: hugetlb: allocate frozen pages for gigantic allocation

2026-01-27T04:02:28+00:00

alloc_gigantic_folio() allocates a folio with refcount increated and then freeze it, convert to allocate a frozen folio to remove the atomic operation about folio refcount, and saving atomic operation during __update_and_free_hugetlb_folio() too. Besides, rename hugetlb_cma_{alloc,free}_folio(), alloc_gigantic_folio() and alloc_buddy_hugetlb_folio() with frozen which make them more self-explanatory. Link: https://lkml.kernel.org/r/20260109093136.1491549-7-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang Reviewed-by: Zi Yan Reviewed-by: Muchun Song Cc: Brendan Jackman Cc: David Hildenbrand Cc: Jane Chu Cc: Johannes Weiner Cc: Matthew Wilcox (Oracle) Cc: Oscar Salvador Cc: Sidhartha Kumar Cc: Vlastimil Babka Cc: Claudiu Beznea Cc: Mark Brown Signed-off-by: Andrew Morton

mm/hugetlb: drop hugetlb_cma_check()

2026-01-27T04:02:19+00:00

hugetlb_cma_check() was required when the ordering of hugetlb_cma_reserve() and hugetlb_bootmem_alloc() was architecture depended. Since hugetlb_cma_reserve() is always called before hugetlb_bootmem_alloc() there is no need to check whether hugetlb_cma_reserve() was already called. Drop unneeded hugetlb_cma_check() function. Link: https://lkml.kernel.org/r/20260111082105.290734-29-rppt@kernel.org Signed-off-by: Mike Rapoport (Microsoft) Acked-by: Muchun Song Cc: Alexander Gordeev Cc: Alex Shi Cc: Andreas Larsson Cc: "Borislav Petkov (AMD)" Cc: Catalin Marinas Cc: David Hildenbrand Cc: David S. Miller Cc: Dinh Nguyen Cc: Geert Uytterhoeven Cc: Guo Ren Cc: Heiko Carstens Cc: Helge Deller Cc: Huacai Chen Cc: Ingo Molnar Cc: Johannes Berg Cc: John Paul Adrian Glaubitz Cc: Jonathan Corbet Cc: Klara Modin Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Magnus Lindholm Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Hocko Cc: Michal Simek Cc: Oscar Salvador Cc: Palmer Dabbelt Cc: Pratyush Yadav Cc: Richard Weinberger Cc: "Ritesh Harjani (IBM)" Cc: Russell King Cc: Stafford Horne Cc: Suren Baghdasaryan Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Vineet Gupta Cc: Vlastimil Babka Cc: Will Deacon Signed-off-by: Andrew Morton

mm: hugetlb: directly pass order when allocate a hugetlb folio

2025-09-21T21:22:11+00:00

Use order instead of struct hstate to remove huge_page_order() call from all hugetlb folio allocation, also order_is_gigantic() is added to check whether it is a gigantic order. Link: https://lkml.kernel.org/r/20250910133958.301467-4-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang Acked-by: Oscar Salvador Reviewed-by: Sidhartha Kumar Reviewed-by: Jane Chu Reviewed-by: Zi Yan Cc: Brendan Jackman Cc: David Hildenbrand Cc: Johannes Weiner Cc: Muchun Song Cc: Vlastimil Babka Signed-off-by: Andrew Morton

mm/hugetlb: move hugetlb CMA code in to its own file

2025-03-17T05:06:31+00:00

hugetlb.c contained a number of CONFIG_CMA ifdefs, and the code inside them was large enough to merit being in its own file, so move it, cleaning up things a bit. Hide some direct variable access behind functions to accommodate the move. No functional change intended. Link: https://lkml.kernel.org/r/20250228182928.2645936-28-fvdl@google.com Signed-off-by: Frank van der Linden Cc: Alexander Gordeev Cc: Andy Lutomirski Cc: Arnd Bergmann Cc: Dan Carpenter Cc: Dave Hansen Cc: David Hildenbrand Cc: Heiko Carstens Cc: Joao Martins Cc: Johannes Weiner Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Muchun Song Cc: Oscar Salvador Cc: Peter Zijlstra Cc: Roman Gushchin (Cruise) Cc: Usama Arif Cc: Vasily Gorbik Cc: Yu Zhao Cc: Zi Yan Signed-off-by: Andrew Morton