swalk            4302 net/ipv4/tcp_input.c 	struct tcp_sack_block *swalk = sp + 1;
swalk            4308 net/ipv4/tcp_input.c 		if (tcp_sack_extend(sp, swalk->start_seq, swalk->end_seq)) {
swalk            4319 net/ipv4/tcp_input.c 		this_sack++, swalk++;