[PATCH v4 2/6] mm: for !CONFIG_PER_VMA_LOCK equate write lock assertion for vma and mmap

[Suren Baghdasaryan]

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>
Reviewed-by: Liam R. Howlett <Liam.Howlett@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