Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-virtio

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-virtio:
  virtio: Force use of power-of-two for descriptor ring sizes
  lguest: Fix lguest virtio-blk backend size computation
  virtio: Fix used_idx wrap-around
  virtio: more fallout from scatterlist changes.
  virtio: fix vring_init for 64 bits