Kernel prepatch 4.9-rc6

Linus has released the 4.9-rc6 kernelprepatch for testing. "We're getting further in the rc series, andwhile things have stayed pretty calm, I'm not sure if we're quite thereyet. There's a few outstanding issues that just shouldn't be issues at rc6time, so we'll just have to see. This may be one of those releases thathave an rc8, which considering the size of 4.9 is perhaps not thatunusual."