mmap: remove unnecessary lock from __vma_link

There's no anon-vma related mangling happening inside __vma_link anymore
so no need of anon_vma locking there.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 2 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index fb89360a2120..31003338b978 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -452,12 +452,10 @@ static void vma_link(struct mm_struct *mm, struct vm_area_struct *vma,
                 spin_lock(&mapping->i_mmap_lock);
                 vma->vm_truncate_count = mapping->truncate_count;
         }
-        vma_lock_anon_vma(vma);
 
         __vma_link(mm, vma, prev, rb_link, rb_parent);
         __vma_link_file(vma);
 
-        vma_unlock_anon_vma(vma);
         if (mapping)
                 spin_unlock(&mapping->i_mmap_lock);