RNF_ACTIVE
tt[0].rn_flags &= ~RNF_ACTIVE;
tt[1].rn_flags &= ~RNF_ACTIVE;
root->rn_flags = RNF_ROOT | RNF_ACTIVE;
parent->rn_flags = RNF_ACTIVE;
tt->rn_flags = RNF_ACTIVE;
if (t->rn_flags & RNF_ACTIVE) {
KASSERT(!(rn->rn_flags & (RNF_ACTIVE | RNF_ROOT)),
if (!(rnode.rn_flags & RNF_ACTIVE))
if (!(rnode.rn_flags & RNF_ACTIVE))