assert_ring_tail_valid
assert_ring_tail_valid(rq->ring, rq->tail);
assert_ring_tail_valid(rq->ring, rq->tail);
assert_ring_tail_valid(rq->ring, rq->tail);
assert_ring_tail_valid(rq->ring, rq->tail);
assert_ring_tail_valid(rq->ring, rq->tail);
assert_ring_tail_valid(rq->ring, rq->tail);
assert_ring_tail_valid(rq->ring, rq->tail);
assert_ring_tail_valid(ring, tail);