[PATCH 0/5] always lock the root anon_vma

[Rik van Riel]

This patch series implements Linus's suggestion of always locking the
root anon_vma.  Because the lock in other anon_vmas no longer protects
anything at all, we cannot do the "lock dance" that Mel's earlier
patches implements and instead need a root pointer in the anon_vma.

The only subtlety these patches rely on is that the same_vma list
is ordered from new to old, with the root anon_vma at the very end.

This, together with the forward list walking in unlink_anon_vmas,
ensures that the root anon_vma is the last one freed.

The KSM refcount adds some additional complexity, because an anon_vma
can stick around after the processes it was attached to have already
exited.  Patch 5/5 deals with that issue.
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