ACEUNIT
#define ACELABELDEV(dev) (MAKEACEDEV(major(dev), ACEUNIT(dev), RAW_PART))
ace = device_lookup_private(&ace_cd, ACEUNIT(bp->b_dev));
ace = device_lookup_private(&ace_cd, ACEUNIT(dev));
struct ace_softc *ace = device_lookup_private(&ace_cd, ACEUNIT(dev));
struct ace_softc *ace = device_lookup_private(&ace_cd, ACEUNIT(dev));
ace = device_lookup_private(&ace_cd, ACEUNIT(dev));
ace = device_lookup_private(&ace_cd, ACEUNIT(dev));