MAKEDEV_REF
*dev = make_dev_credf(MAKEDEV_REF, &firewire_cdevsw,
mda.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_REF;
*dev = make_dev_credf(MAKEDEV_REF, &vkbd_dev_cdevsw, unit,
if ((args.mda_flags & MAKEDEV_REF) != 0)
flags = flags & TTYMK_CLONING ? MAKEDEV_REF : 0;
args.mda_flags = MAKEDEV_REF | MAKEDEV_CHECKNAME;