MAPLE_QUEUE_PROBE
if (u->u_queuestat == MAPLE_QUEUE_PROBE)
u->u_queuestat = MAPLE_QUEUE_PROBE;
u->u_queuestat = MAPLE_QUEUE_PROBE;
u1->u_queuestat = MAPLE_QUEUE_PROBE;
u->u_queuestat = MAPLE_QUEUE_PROBE;
KASSERT(u->u_queuestat == MAPLE_QUEUE_PROBE);