rolling_buffer_init
if (rolling_buffer_init(&rreq->buffer, rreq->debug_id, ITER_DEST) < 0)
if (rolling_buffer_init(&rreq->buffer, rreq->debug_id, ITER_DEST) < 0)
if (rolling_buffer_init(&wreq->buffer, wreq->debug_id, ITER_SOURCE) < 0)
int rolling_buffer_init(struct rolling_buffer *roll, unsigned int rreq_id,