From d17f02417a337de0a0c6e763e938ee5e41a97c3d Mon Sep 17 00:00:00 2001 From: Lorenzo Stoakes Date: Sun, 18 Jan 2026 14:50:45 +0000 Subject: mm/rmap: separate out fork-only logic on anon_vma_clone() Specify which operation is being performed to anon_vma_clone(), which allows us to do checks specific to each operation type, as well as to separate out and make clear that the anon_vma reuse logic is absolutely specific to fork only. This opens the door to further refactorings and refinements later as we have more information to work with. Link: https://lkml.kernel.org/r/cf7da7a2d973cdc72a1b80dd9a73260519e8fa9f.1768746221.git.lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes Reviewed-by: Liam R. Howlett Reviewed-by: Suren Baghdasaryan Cc: Barry Song Cc: Chris Li Cc: David Hildenbrand Cc: Harry Yoo Cc: Jann Horn Cc: Michal Hocko Cc: Mike Rapoport Cc: Pedro Falcato Cc: Rik van Riel Cc: Shakeel Butt Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- tools/testing/vma/vma_internal.h | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) (limited to 'tools/testing') diff --git a/tools/testing/vma/vma_internal.h b/tools/testing/vma/vma_internal.h index 93e5792306d9..7fa56dcc53a6 100644 --- a/tools/testing/vma/vma_internal.h +++ b/tools/testing/vma/vma_internal.h @@ -600,6 +600,14 @@ struct mmap_action { bool hide_from_rmap_until_complete :1; }; +/* Operations which modify VMAs. */ +enum vma_operation { + VMA_OP_SPLIT, + VMA_OP_MERGE_UNFAULTED, + VMA_OP_REMAP, + VMA_OP_FORK, +}; + /* * Describes a VMA that is about to be mmap()'ed. Drivers may choose to * manipulate mutable fields which will cause those fields to be updated in the @@ -1157,7 +1165,8 @@ static inline int vma_dup_policy(struct vm_area_struct *src, struct vm_area_stru return 0; } -static inline int anon_vma_clone(struct vm_area_struct *dst, struct vm_area_struct *src) +static inline int anon_vma_clone(struct vm_area_struct *dst, struct vm_area_struct *src, + enum vma_operation operation) { /* For testing purposes. We indicate that an anon_vma has been cloned. */ if (src->anon_vma != NULL) { -- cgit v1.2.3