NKR_NEEDRING
NMR(na, t)[i]->nr_kflags |= NKR_NEEDRING;
(kring->nr_kflags & NKR_NEEDRING));
!(kring->nr_kflags & NKR_NEEDRING);
kring->name, ring, kring->users, kring->nr_kflags & NKR_NEEDRING);
kring->name, ring, kring->users, kring->nr_kflags & NKR_NEEDRING);
kring->pipe->nr_kflags |= NKR_NEEDRING;
(NKR_FAKERING | NKR_NEEDRING);
kring->nr_kflags &= ~(NKR_FAKERING | NKR_NEEDRING);