Commits added to powerpc.git master and powerpc-next branches

[Paul Mackerras]

I wrote:

> Hold off from pulling this for now, everyone...  I inadvertently broke
> builds with 64k pages by leaving in some stuff that was purely for
> testing in my "Only demote individual slices rather than whole
> process" patch.  I'll re-do the tree in order to avoid breaking
> bisection.

I have redone the tree now.  If you have pulled within the last one
and a half hours, you'll need to do a git pull -f.  Sorry about that.

Paul.