[PATCH -mm 1/6] mmap: remove unnecessary lock from __vma_link

[Rik van Riel]

From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx>
Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>
---

diff --git a/mm/mmap.c b/mm/mmap.c
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -469,12 +469,10 @@ static void vma_link(struct mm_struct *m
 		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);
 
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