SCM_TSTAMP_ACK    957 net/can/j1939/socket.c 		serr->ee.ee_info = SCM_TSTAMP_ACK;
SCM_TSTAMP_ACK   3061 net/ipv4/tcp_input.c 			__skb_tstamp_tx(skb, NULL, sk, SCM_TSTAMP_ACK);
SCM_TSTAMP_ACK    163 tools/testing/selftests/networking/timestamping/txtimestamp.c 	case SCM_TSTAMP_ACK: