On Sat, Mar 13, 2010 at 1:41 AM, Mel Gorman <mel@xxxxxxxxx> wrote: > rmap_walk_anon() does not use page_lock_anon_vma() for looking up and > locking an anon_vma and it does not appear to have sufficient locking to > ensure the anon_vma does not disappear from under it. > > This patch copies an approach used by KSM to take a reference on the > anon_vma while pages are being migrated. This should prevent rmap_walk() > running into nasty surprises later because anon_vma has been freed. > > Signed-off-by: Mel Gorman <mel@xxxxxxxxx> > Acked-by: Rik van Riel <riel@xxxxxxxxxx> Reviewed-by: Minchan Kim <minchan.kim@xxxxxxxxx> BTW, This another refcount of anon_vma is merged with KSM by [3/11]. Looks good to me. -- Kind regards, Minchan Kim -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>