SSM_INSTANCE_SHIFT
instance = (getminor(dev) >> SSM_INSTANCE_SHIFT);
minor_num = (instance << SSM_INSTANCE_SHIFT) | bd;
instance = (getminor(*devi) >> SSM_INSTANCE_SHIFT);
instance = (getminor(dev) >> SSM_INSTANCE_SHIFT);
instance = (getminor(dev) >> SSM_INSTANCE_SHIFT);