m_to_oc_flags
(struct mbuf *)object_cache_alloc(sMBufCache, m_to_oc_flags(how));
(struct mbuf *)object_cache_alloc(sMBufCache, m_to_oc_flags(how));
(struct mbuf *)object_cache_alloc(sMBufCache, m_to_oc_flags(how));
return object_cache_alloc(cache, m_to_oc_flags(how));