1 files changed, 4 insertions, 4 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index 9a796c41e7d9..88408632da66 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2561,15 +2561,15 @@ 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.
                  */
-                mutex_lock_nest_lock(&anon_vma->root->mutex, &mm->mmap_sem);
+                down_write(&anon_vma->root->rwsem);
                 /*
                  * We can safely modify head.next after taking the
-                 * anon_vma->root->mutex. If some other vma in this mm shares
+                 * anon_vma->root->rwsem. If some other vma in this mm shares
                  * the same anon_vma we won't take it again.
                  *
                  * No need of atomic instructions here, head.next
                  * can't change from under us thanks to the
-                 * anon_vma->root->mutex.
+                 * anon_vma->root->rwsem.
                  */
                 if (__test_and_set_bit(0, (unsigned long *)
                                        &anon_vma->root->rb_root.rb_node))
@@ -2671,7 +2671,7 @@ static void vm_unlock_anon_vma(struct anon_vma *anon_vma)
                  *
                  * No need of atomic instructions here, head.next
                  * can't change from under us until we release the
-                 * anon_vma->root->mutex.
+                 * anon_vma->root->rwsem.
                  */
                 if (!__test_and_clear_bit(0, (unsigned long *)
                                           &anon_vma->root->rb_root.rb_node))