1 files changed, 1 insertions, 1 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index f54b235f29a9..35730ee9d515 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2886,7 +2886,7 @@ static void vm_lock_anon_vma(struct mm_struct *mm, struct anon_vma *anon_vma)
                  * The LSB of head.next can't change from under us
                  * because we hold the mm_all_locks_mutex.
                  */
-                down_write(&anon_vma->root->rwsem);
+                down_write_nest_lock(&anon_vma->root->rwsem, &mm->mmap_sem);
                 /*
                  * We can safely modify head.next after taking the
                  * anon_vma->root->rwsem. If some other vma in this mm shares