Symbol: VTSCSI_EXECUTE_POLL
sys/dev/virtual/virtio/scsi/virtio_scsi.c
1467
KKASSERT(flag == VTSCSI_EXECUTE_POLL || req->vsr_complete != NULL);
sys/dev/virtual/virtio/scsi/virtio_scsi.c
1482
if (flag == VTSCSI_EXECUTE_POLL)