lkml.org 
[lkml]   [2010]   [Jun]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH -mm 2/6] rmap: always add new vmas at the end
From: Andrea Arcangeli <aarcange@redhat.com>
Subject: always add new vmas at the end

Make sure to always add new VMAs at the end of the list. This
is important so rmap_walk does not miss a VMA that was created
during the rmap_walk.

The old code got this right most of the time due to luck, but
was buggy when anon_vma_prepare reused a mergeable anon_vma.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
---

diff --git a/mm/rmap.c b/mm/rmap.c
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -149,7 +149,7 @@ int anon_vma_prepare(struct vm_area_stru
avc->anon_vma = anon_vma;
avc->vma = vma;
list_add(&avc->same_vma, &vma->anon_vma_chain);
- list_add(&avc->same_anon_vma, &anon_vma->head);
+ list_add_tail(&avc->same_anon_vma, &anon_vma->head);
allocated = NULL;
avc = NULL;
}


\
 
 \ /
  Last update: 2010-06-21 22:43    [W:0.045 / U:0.516 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site