GRE_IS_CSUM       351 drivers/net/ppp/pptp.c 		GRE_IS_CSUM(header->gre_hd.flags) ||    /* flag CSUM should be clear */
GRE_IS_CSUM       189 tools/testing/selftests/bpf/progs/bpf_flow.c 		if (GRE_IS_CSUM(gre->flags))