Symbol: m_countm
sys/kern/uipc_sockbuf.c
303
length = m_countm(control, &n, &cmbcnt) + m_countm(m0, NULL, &m0mbcnt);
sys/sys/mbuf.h
513
u_int m_countm(struct mbuf *m, struct mbuf **lastm, u_int *mbcnt);