incr_index
cmdq->write_idx = incr_index(idx, 1, ndev->qlen);
idx = incr_index(idx, 1, droq->max_count);
droq->refill_idx = incr_index(droq->refill_idx,
refill_index = incr_index(refill_index, 1, droq->max_count);
droq->refill_idx = incr_index(droq->refill_idx, 1,
droq->read_idx = incr_index(droq->read_idx, buf_cnt,
droq->read_idx = incr_index(droq->read_idx,
droq->read_idx = incr_index(droq->read_idx, 1,
incr_index(droq->read_idx, 1,
iq->host_write_index = incr_index(iq->host_write_index, 1,
old = incr_index(old, 1, iq->max_count);