Kernel prepatch 4.16-rc7

The 4.16-rc7 prepatch is out; it'sprobably the last one. "I'm still not *planning*on an rc8 this release, because while rc7 is bigger than usual,nothing in here makes me go 'Hmm, maybe we should delay the release'.But let's see what happens this upcoming week - if next Sunday comesaround, and there's lots of new stuff, I'll reconsider then."