It seems to me that drvctl(8) is pretty useful - and it requires the
drvctl pseudo-device in the kernel.  It's necessary for those trying to
use GPT on their disks, for example.  It seems to me it should be in
GENERIC on most ports - though I certainly wouldn't undertake to blindly
enable it on ports I don't use.

What do other folks think?  At the very least, I'd think on i386 and
amd64 - I could test it on macppc as well, though I haven't (yet) had
need of it there.

+j