From: Andrea Arcangeli <aarcange@redhat.com>
Date: Tue, 10 Aug 2010 00:19:07 +0000 (-0700)
Subject: mmap: remove unnecessary lock from __vma_link
X-Git-Url: https://git.karo-electronics.de/?p=mv-sheeva.git;a=commitdiff_plain;h=5e549e989f94de0596b8149a90e0088e7d4d7c97

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 fb89360a212..31003338b97 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);