TDP_EFIRT
if (__predict_false((td->td_pflags & TDP_EFIRT) != 0)) {
MPASS((td->td_pflags & TDP_EFIRT) == 0);
td->td_pflags |= TDP_EFIRT;
MPASS((td->td_pflags & TDP_EFIRT) != 0);
td->td_pflags &= ~TDP_EFIRT;