PT_ROOT_INTR
KASSERT(spipe->ptype == PT_ROOT_INTR);
spipe->ptype = PT_ROOT_INTR;
PT_ROOT_INTR, sc, spipe, NULL, return);
if (pipe->up_interval && spipe->ptype != PT_ROOT_INTR)
if (spipe->ptype == PT_ROOT_INTR) {