QFQ_MAX_SLOTS
struct qfq_class *slots[QFQ_MAX_SLOTS];
unsigned int i = (grp->front + slot) % QFQ_MAX_SLOTS;
grp->front = (grp->front + i) % QFQ_MAX_SLOTS;
grp->front = (grp->front - i) % QFQ_MAX_SLOTS;
i = (grp->front + offset) % QFQ_MAX_SLOTS;
for (j = 0; j < QFQ_MAX_SLOTS; j++) {