diff options
| author | Suren Baghdasaryan <surenb@google.com> | 2023-02-27 20:36:22 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-04-06 06:03:00 +0300 |
| commit | 50ee32537206140e4cf6e47024be29a84d458d49 (patch) | |
| tree | daa86ed970962a3fca269595a31077160ca90328 /include/linux/mm.h | |
| parent | 457f67be5910a2b5f1fda8af06bfe4d3492a0a4f (diff) | |
| download | linux-50ee32537206140e4cf6e47024be29a84d458d49.tar.xz | |
mm: introduce lock_vma_under_rcu to be used from arch-specific code
Introduce lock_vma_under_rcu function to lookup and lock a VMA during page
fault handling. When VMA is not found, can't be locked or changes after
being locked, the function returns NULL. The lookup is performed under
RCU protection to prevent the found VMA from being destroyed before the
VMA lock is acquired. VMA lock statistics are updated according to the
results. For now only anonymous VMAs can be searched this way. In other
cases the function returns NULL.
Link: https://lkml.kernel.org/r/20230227173632.3292573-24-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/mm.h')
| -rw-r--r-- | include/linux/mm.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index d0f289bfef01..0619f9fa7581 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -719,6 +719,9 @@ static inline void vma_mark_detached(struct vm_area_struct *vma, bool detached) vma->detached = detached; } +struct vm_area_struct *lock_vma_under_rcu(struct mm_struct *mm, + unsigned long address); + #else /* CONFIG_PER_VMA_LOCK */ static inline void vma_init_lock(struct vm_area_struct *vma) {} |