Linux 4.0 rc6

Things are calming down nicelly, and there are fixes all over. The
NUMA balancing performance regression is fixed, and things are looking
up again in general. There were a number of i915 issues and a KVM
double-fault thing that meant that for a while there I was pretty sure
that this would be a release that will go to rc8, but that may be

Apart from the aforementioned issues, the bulk of this is mostly small
misc driver fixes and architecture updates. The shortlog gives more of
a flavor of what's been going on.

But please do give this a good testing, and holler if there's some
regression we've missed.