Kernel prepatch 4.17-rc4

The 4.17-rc4 kernel prepatch is out."Two thirds of the 4.17-rc4 patch is drivers, which sounds about right.Media, networking, rdma, input, nvme, usb. A little bit of everything, inother words." The codename has been changed, for the first timesince 4.10, to "Merciless Moray".