Symbol: M_START
sys/kern/uipc_mbuf.c
345
a = M_START(m);
sys/sys/mbuf.h
1219
KASSERT(m->m_data == M_START(m),
sys/sys/mbuf.h
1242
(M_WRITABLE(m) ? ((m)->m_data - M_START(m)) : 0)
sys/sys/mbuf.h
1253
#define M_TRAILINGROOM(m) ((M_START(m) + M_SIZE(m)) - ((m)->m_data + (m)->m_len))