vb2_thread_start
EXPORT_SYMBOL_GPL(vb2_thread_start);
rc = vb2_thread_start(&dvb->dvbq, dvb_fnc, dvb, dvb->name);
rc = vb2_thread_start(&s->q, alsa_fnc, s, s->vdev.name);
rc = vb2_thread_start(&s->q, alsa_pb_fnc, s, s->vdev.name);
int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv,