Ahs yes, greg KH. While he did good work with udev initially and stewarding the stable kernels, i fear he has sold out otherwise.

He was basically pitching kdbus on behalf on the automobile industry a year or two back, because they wanted a drop in replacement for QNX and its in-kernel RPC.

And you will find some "lovely" mailing list duels between him and Landley about documenting the interface between kernel and udev, as Landley was trying to develop a minimal udev replacement.