esid2base
child->ua_base = esid2base(esid, child->ua_level);
KASSERT(esid2base(esid, child->ua_level) != child->ua_base,
while (esid2base(esid, level) !=
esid2base(child->ua_base, level))
inter->ua_base = esid2base(esid, inter->ua_level);
esid2base(esid, ua->ua_level) != ua->ua_base)
if (esid2base(esid, next->ua_level) != next->ua_base) {
esid2base(esid, ua->ua_level) != ua->ua_base) {
(esid2base(ua->ua_base, ua->ua_level) == ua->ua_base)