Kernel prepatch 4.0-rc6

Linus has released 4.0-rc6 right onschedule. "Things are calming down nicely, and there are fixes allover. The NUMA balancing performance regression is fixed, and things arelooking up again in general. There were a number of i915 issues and a KVMdouble-fault thing that meant that for a while there I was pretty sure thatthis would be a release that will go to rc8, but that may beunnecessary."