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From: Rik van Riel on 21 Jun 2010 16:50
From: Andrea Arcangeli <aarcange(a)redhat.com>
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(a)redhat.com>
Signed-off-by: Rik van Riel <riel(a)redhat.com>
---

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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Prev: clk: Generic support for fixed-rate clocks
Next: [PATCH -mm 2/6] rmap: always add new vmas at the end