kernel/linux.git/mm/mmap.c, branch v7.0.10

mm: update secretmem to use VMA flags on mmap_prepare

2026-02-12T23:42:58+00:00

This patch updates secretmem to use the new vma_flags_t type which will soon supersede vm_flags_t altogether. In order to make this change we also have to update mlock_future_ok(), we replace the vm_flags_t parameter with a simple boolean is_vma_locked one, which also simplifies the invocation here. This is laying the groundwork for eliminating the vm_flags_t in vm_area_desc and more broadly throughout the kernel. No functional changes intended. [lorenzo.stoakes@oracle.com: fix check_brk_limits(), per Chris] Link: https://lkml.kernel.org/r/3aab9ab1-74b4-405e-9efb-08fc2500c06e@lucifer.local Link: https://lkml.kernel.org/r/a243a09b0a5d0581e963d696de1735f61f5b2075.1769097829.git.lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes Reviewed-by: Liam R. Howlett Cc: Baolin Wang Cc: Barry Song Cc: David Hildenbrand Cc: Dev Jain Cc: Jason Gunthorpe Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Zi Yan Cc: Damien Le Moal Cc: "Darrick J. Wong" Cc: Jarkko Sakkinen Cc: Yury Norov Cc: Chris Mason Cc: Pedro Falcato Signed-off-by: Andrew Morton

mm: update hugetlbfs to use VMA flags on mmap_prepare

2026-02-12T23:42:57+00:00

In order to update all mmap_prepare users to utilising the new VMA flags type vma_flags_t and associated helper functions, we start by updating hugetlbfs which has a lot of additional logic that requires updating to make this change. This is laying the groundwork for eliminating the vm_flags_t from struct vm_area_desc and using vma_flags_t only, which further lays the ground for removing the deprecated vm_flags_t type altogether. No functional changes intended. Link: https://lkml.kernel.org/r/9226bec80c9aa3447cc2b83354f733841dba8a50.1769097829.git.lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes Reviewed-by: Liam R. Howlett Cc: Baolin Wang Cc: Barry Song Cc: David Hildenbrand Cc: Dev Jain Cc: Jason Gunthorpe Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Zi Yan Cc: Damien Le Moal Cc: "Darrick J. Wong" Cc: Jarkko Sakkinen Cc: Yury Norov Cc: Chris Mason Cc: Pedro Falcato Signed-off-by: Andrew Morton

mm: use unmap_desc struct for freeing page tables

2026-02-12T23:42:56+00:00

Pass through the unmap_desc to free_pgtables() because it almost has everything necessary and is already on the stack. Updates testing code as necessary. No functional changes intended. [Liam.Howlett@oracle.com: fix up unmap desc use on exit_mmap()] Link: https://lkml.kernel.org/r/20260210214214.364856-1-Liam.Howlett@oracle.com Link: https://lkml.kernel.org/r/20260121164946.2093480-12-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett Reviewed-by: Lorenzo Stoakes Cc: Suren Baghdasaryan Cc: Baoquan He Cc: Barry Song Cc: Chris Li Cc: David Hildenbrand Cc: David Hildenbrand Cc: Jann Horn Cc: Kairui Song Cc: Kemeng Shi Cc: Matthew Wilcox (Oracle) Cc: Michal Hocko Cc: Mike Rapoport Cc: Nhat Pham Cc: Pedro Falcato Cc: SeongJae Park Cc: Vlastimil Babka Signed-off-by: Andrew Morton

mm/vma: use unmap_desc in exit_mmap() and vms_clear_ptes()

2026-02-12T23:42:55+00:00

Convert vms_clear_ptes() to use unmap_desc to call unmap_vmas() instead of the large argument list. The UNMAP_STATE() cannot be used because the vma iterator in the vms does not point to the correct maple state (mas_detach), and the tree_end will be set incorrectly. Setting up the arguments manually avoids setting the struct up incorrectly and doing extra work to get the correct pagetable range. exit_mmap() also calls unmap_vmas() with many arguments. Using the unmap_all_init() function to set the unmap descriptor for all vmas makes this a bit easier to read. Update to the vma test code is necessary to ensure testing continues to function. No functional changes intended. Link: https://lkml.kernel.org/r/20260121164946.2093480-10-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett Cc: Baoquan He Cc: Barry Song Cc: Chris Li Cc: David Hildenbrand Cc: David Hildenbrand Cc: Jann Horn Cc: Kairui Song Cc: Kemeng Shi Cc: Lorenzo Stoakes Cc: Matthew Wilcox (Oracle) Cc: Michal Hocko Cc: Mike Rapoport Cc: Nhat Pham Cc: Pedro Falcato Cc: SeongJae Park Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton

mm: introduce unmap_desc struct to reduce function arguments

2026-02-12T23:42:55+00:00

The unmap_region code uses a number of arguments that could use better documentation. With the addition of a descriptor for unmap (called unmap_desc), the arguments can be more self-documenting and increase the descriptions within the declaration. No functional change intended Link: https://lkml.kernel.org/r/20260121164946.2093480-9-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett Reviewed-by: Lorenzo Stoakes Reviewed-by: Pedro Falcato Cc: Baoquan He Cc: Barry Song Cc: Chris Li Cc: David Hildenbrand Cc: David Hildenbrand Cc: Jann Horn Cc: Kairui Song Cc: Kemeng Shi Cc: Matthew Wilcox (Oracle) Cc: Michal Hocko Cc: Mike Rapoport Cc: Nhat Pham Cc: SeongJae Park Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton

mm: change dup_mmap() recovery

2026-02-12T23:42:55+00:00

When the dup_mmap() fails during the vma duplication or setup, don't write the XA_ZERO entry in the vma tree. Instead, destroy the tree and free the new resources, leaving an empty vma tree. Using XA_ZERO introduced races where the vma could be found between dup_mmap() dropping all locks and exit_mmap() taking the locks. The race can occur because the mm can be reached through the other trees via successfully copied vmas and other methods such as the swapoff code. XA_ZERO was marking the location to stop vma removal and pagetable freeing. The newly created arguments to the unmap_vmas() and free_pgtables() serve this function. Replacing the XA_ZERO entry use with the new argument list also means the checks for xa_is_zero() are no longer necessary so these are also removed. Note that dup_mmap() now cleans up when ALL vmas are successfully copied, but the dup_mmap() fails to completely set up some other aspect of the duplication. Link: https://lkml.kernel.org/r/20260121164946.2093480-8-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett Reviewed-by: Lorenzo Stoakes Reviewed-by: Pedro Falcato Reviewed-by: Suren Baghdasaryan Cc: Baoquan He Cc: Barry Song Cc: Chris Li Cc: David Hildenbrand Cc: David Hildenbrand Cc: Jann Horn Cc: Kairui Song Cc: Kemeng Shi Cc: Matthew Wilcox (Oracle) Cc: Michal Hocko Cc: Mike Rapoport Cc: Nhat Pham Cc: SeongJae Park Cc: Vlastimil Babka Signed-off-by: Andrew Morton

mm/memory: add tree limit to free_pgtables()

2026-02-12T23:42:54+00:00

The ceiling and tree search limit need to be different arguments for the future change in the failed fork attempt. The ceiling and floor variables are not very descriptive, so change them to pg_start/pg_end. Adding a new variable for the vma_end to the function as it will differ from the pg_end in the later patches in the series. Add a kernel doc about the free_pgtables() function. Test code also updated. No functional changes intended. Link: https://lkml.kernel.org/r/20260121164946.2093480-6-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett Reviewed-by: Lorenzo Stoakes Reviewed-by: Pedro Falcato Cc: Baoquan He Cc: Barry Song Cc: Chris Li Cc: David Hildenbrand Cc: David Hildenbrand Cc: Jann Horn Cc: Kairui Song Cc: Kemeng Shi Cc: Matthew Wilcox (Oracle) Cc: Michal Hocko Cc: Mike Rapoport Cc: Nhat Pham Cc: SeongJae Park Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton

mm/mmap: abstract vma clean up from exit_mmap()

2026-02-12T23:42:54+00:00

Create the new function tear_down_vmas() to remove a range of vmas. exit_mmap() will be removing all the vmas. This is necessary for future patches. No functional changes intended. Link: https://lkml.kernel.org/r/20260121164946.2093480-4-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett Reviewed-by: Lorenzo Stoakes Reviewed-by: David Hildenbrand Reviewed-by: Pedro Falcato Reviewed-by: Suren Baghdasaryan Cc: Baoquan He Cc: Barry Song Cc: Chris Li Cc: David Hildenbrand Cc: Jann Horn Cc: Kairui Song Cc: Kemeng Shi Cc: Matthew Wilcox (Oracle) Cc: Michal Hocko Cc: Mike Rapoport Cc: Nhat Pham Cc: SeongJae Park Cc: Vlastimil Babka Signed-off-by: Andrew Morton

mm/mmap: move exit_mmap() trace point

2026-02-12T23:42:53+00:00

Move the trace point later in the function so that it is not skipped in the event of a failed fork. Link: https://lkml.kernel.org/r/20260121164946.2093480-3-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett Acked-by: Chris Li Reviewed-by: Lorenzo Stoakes Reviewed-by: David Hildenbrand Reviewed-by: Pedro Falcato Reviewed-by: Suren Baghdasaryan Cc: Baoquan He Cc: Barry Song Cc: David Hildenbrand Cc: Jann Horn Cc: Kairui Song Cc: Kemeng Shi Cc: Matthew Wilcox (Oracle) Cc: Michal Hocko Cc: Mike Rapoport Cc: Nhat Pham Cc: SeongJae Park Cc: Vlastimil Babka Signed-off-by: Andrew Morton

mm: softdirty: add pgtable_supports_soft_dirty()

2025-11-24T23:08:54+00:00

Patch series "mm: Add soft-dirty and uffd-wp support for RISC-V", v15. This patchset adds support for Svrsw60t59b [1] extension which is ratified now, also add soft dirty and userfaultfd write protect tracking for RISC-V. The patches 1 and 2 add macros to allow architectures to define their own checks if the soft-dirty / uffd_wp PTE bits are available, in other words for RISC-V, the Svrsw60t59b extension is supported on which device the kernel is running. Also patch1-2 are removing "ifdef CONFIG_MEM_SOFT_DIRTY" "ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP" and "ifdef CONFIG_PTE_MARKER_UFFD_WP" in favor of checks which if not overridden by the architecture, no change in behavior is expected. This patchset has been tested with kselftest mm suite in which soft-dirty, madv_populate, test_unmerge_uffd_wp, and uffd-unit-tests run and pass, and no regressions are observed in any of the other tests. This patch (of 6): Some platforms can customize the PTE PMD entry soft-dirty bit making it unavailable even if the architecture provides the resource. Add an API which architectures can define their specific implementations to detect if soft-dirty bit is available on which device the kernel is running. This patch is removing "ifdef CONFIG_MEM_SOFT_DIRTY" in favor of pgtable_supports_soft_dirty() checks that defaults to IS_ENABLED(CONFIG_MEM_SOFT_DIRTY), if not overridden by the architecture, no change in behavior is expected. We make sure to never set VM_SOFTDIRTY if !pgtable_supports_soft_dirty(), so we will never run into VM_SOFTDIRTY checks. [lorenzo.stoakes@oracle.com: fix VMA selftests] Link: https://lkml.kernel.org/r/dac6ddfe-773a-43d5-8f69-021b9ca4d24b@lucifer.local Link: https://lkml.kernel.org/r/20251113072806.795029-1-zhangchunyan@iscas.ac.cn Link: https://lkml.kernel.org/r/20251113072806.795029-2-zhangchunyan@iscas.ac.cn Link: https://github.com/riscv-non-isa/riscv-iommu/pull/543 [1] Signed-off-by: Chunyan Zhang Acked-by: David Hildenbrand Cc: Albert Ou Cc: Alexandre Ghiti Cc: Al Viro Cc: Arnd Bergmann Cc: Axel Rasmussen Cc: Christian Brauner Cc: Conor Dooley Cc: Deepak Gupta Cc: Jan Kara Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Xu Cc: Rob Herring Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Yuanchu Xie Cc: Alexandre Ghiti Cc: Andrew Jones Cc: Conor Dooley Signed-off-by: Andrew Morton