[PATCH v2 2/6] mm: for !CONFIG_PER_VMA_LOCK equate write lock assertion for vma and mmap

From: Suren Baghdasaryan
Date: Tue Aug 01 2023 - 18:07:52 EST


When CONFIG_PER_VMA_LOCK=n, vma_assert_write_locked() should be equivalent
to mmap_assert_write_locked().

Suggested-by: Jann Horn <jannh@xxxxxxxxxx>
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
---
include/linux/mm.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 406ab9ea818f..262b5f44101d 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -750,7 +750,8 @@ static inline void vma_end_read(struct vm_area_struct *vma) {}
static inline void vma_start_write(struct vm_area_struct *vma) {}
static inline bool vma_try_start_write(struct vm_area_struct *vma)
{ return true; }
-static inline void vma_assert_write_locked(struct vm_area_struct *vma) {}
+static inline void vma_assert_write_locked(struct vm_area_struct *vma)
+ { mmap_assert_write_locked(vma->vm_mm); }
static inline void vma_mark_detached(struct vm_area_struct *vma,
bool detached) {}

--
2.41.0.585.gd2178a4bd4-goog