BULK_INDEX
&queue->bulks[BULK_INDEX(queue->remove)];
struct vchiq_bulk *bulk = &queue->bulks[BULK_INDEX(queue->process)];
bulk = &queue->bulks[BULK_INDEX(queue->remote_insert)];
bulk = &queue->bulks[BULK_INDEX(queue->local_insert)];
unsigned int i = BULK_INDEX(service->bulk_tx.remove);
unsigned int i = BULK_INDEX(service->bulk_rx.remove);