INDIRECT_CALL_L4   33 net/ipv6/ip6_offload.c 		INDIRECT_CALL_L4(cb, f2, f1, head, skb);	\
INDIRECT_CALL_L4  343 net/ipv6/ip6_offload.c 	err = INDIRECT_CALL_L4(ops->callbacks.gro_complete, tcp6_gro_complete,