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| author | Suren Baghdasaryan <surenb@google.com> | 2023-02-27 09:36:21 -0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-04-05 20:02:59 -0700 |
| commit | 457f67be5910a2b5f1fda8af06bfe4d3492a0a4f (patch) | |
| tree | d28c0949fd9211d20dfbe3d50a1e8ed38470e05a /mm/mmap.c | |
| parent | eeff9a5d47f89bc641034fea05501c8a6de131cb (diff) | |
| download | lwn-457f67be5910a2b5f1fda8af06bfe4d3492a0a4f.tar.gz lwn-457f67be5910a2b5f1fda8af06bfe4d3492a0a4f.zip | |
mm: introduce vma detached flag
Per-vma locking mechanism will search for VMA under RCU protection and
then after locking it, has to ensure it was not removed from the VMA tree
after we found it. To make this check efficient, introduce a
vma->detached flag to mark VMAs which were removed from the VMA tree.
Link: https://lkml.kernel.org/r/20230227173632.3292573-23-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 18aed0ea6bd3..b42f58591b9a 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -599,6 +599,7 @@ static inline void vma_complete(struct vma_prepare *vp, if (vp->remove) { again: + vma_mark_detached(vp->remove, true); if (vp->file) { uprobe_munmap(vp->remove, vp->remove->vm_start, vp->remove->vm_end); @@ -2276,6 +2277,7 @@ static inline int munmap_sidetree(struct vm_area_struct *vma, if (mas_store_gfp(mas_detach, vma, GFP_KERNEL)) return -ENOMEM; + vma_mark_detached(vma, true); if (vma->vm_flags & VM_LOCKED) vma->vm_mm->locked_vm -= vma_pages(vma); |