backenable
backenable(q, band);
backenable(q, bpri);
backenable(q, 0);
backenable(q, pri);
backenable(q, 0);
backenable(q, qbp->qb_first->b_band);
backenable(oq, 0);
extern void backenable(queue_t *, uchar_t);