On Fri, 12 Mar 2010 16:41:17 +0000 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> > --- > include/linux/rmap.h | 23 +++++++++++++++++++++++ > mm/migrate.c | 12 ++++++++++++ > mm/rmap.c | 10 +++++----- > 3 files changed, 40 insertions(+), 5 deletions(-) > Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> -- 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>