2.6.12-rc5-git8 regression on PPC64

[Roland Dreier]

    Nathan> Backing this one out fixes it here on a Power5 570.

    Nathan> http://marc.theaimsgroup.com/?l=bk-commits-head&m=111772917211270&q=raw

This fixes the boot on an OpenPower 710 for me as well.

Thanks,
  Roland