TO_TLL
addr = (uintptr_t)TO_TLL(twd->next);
tll = TO_TLL(tunll_list.q_forw);
for (; tll != TO_TLL(&tunll_list); tll = TO_TLL(tll->tll_next))
tll = TO_TLL(tunll_list.q_forw);
while (tll != TO_TLL(&tunll_list)) {
tll = TO_TLL(tll->tll_next);
if (tll != TO_TLL(&tunll_list)) {
tll = TO_TLL(tunll_list.q_forw);
while (tll != TO_TLL(&tunll_list)) {
tll = TO_TLL(tll->tll_next);