GRE_IS_SEQ        281 drivers/net/ppp/pptp.c 		ack = GRE_IS_SEQ(header->gre_hd.flags) ? header->ack : header->seq;
GRE_IS_SEQ        294 drivers/net/ppp/pptp.c 	if (!GRE_IS_SEQ(header->gre_hd.flags))
GRE_IS_SEQ        193 tools/testing/selftests/bpf/progs/bpf_flow.c 		if (GRE_IS_SEQ(gre->flags))