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>

diff --git a/mm/mmap.c b/mm/mmap.c
index fb89360a2120a99905edf9438cca2b69c8b4fd25..31003338b978b78ef66d4579033cdd1d3ebd1a16 100644 (file)
--- 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);