SYSTF_IPIRUNNING
info->flags = (info->flags | SYSTF_ONQUEUE) & ~SYSTF_IPIRUNNING;
KKASSERT((info->flags & SYSTF_IPIRUNNING) == 0);
info->flags |= SYSTF_IPIRUNNING;
KKASSERT(gd == mycpu && (info->flags & SYSTF_IPIRUNNING) == 0);