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

[Paul Mackerras]

Paul Mackerras writes:

> The following commits have been added to the master and powerpc-next
> branches of the powerpc.git repository.  This includes patches pulled
> from Kumar's and Josh's trees.

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.

Paul.