874 			__u16	csum_start;  member
2652 	return skb->csum_start - skb_headroom(skb);  in skb_checksum_start_offset()
2657 	return skb->head + skb->csum_start;  in skb_checksum_start()
4141 	skb->csum_start = ((unsigned char *)ptr + start) - skb->head;  in skb_remcsum_adjust_partial()
4455 	__u16	csum_start;  member
4488 	SKB_GSO_CB(skb)->csum_start = skb_checksum_start(skb) - skb->head;  in gso_reset_checksum()
4501 	unsigned char *csum_start = skb_transport_header(skb);  in gso_make_checksum()  local
4502 	int plen = (skb->head + SKB_GSO_CB(skb)->csum_start) - csum_start;  in gso_make_checksum()
4506 	SKB_GSO_CB(skb)->csum_start = csum_start - skb->head;  in gso_make_checksum()
4508 	return csum_fold(csum_partial(csum_start, plen, partial));  in gso_make_checksum()
4627 	unsigned char *csum_start = skb_checksum_start(skb);  in lco_csum()  local
4632 	partial = ~csum_unfold(*(__force __sum16 *)(csum_start +  in lco_csum()
4638 	return csum_partial(l4_hdr, csum_start - l4_hdr, partial);  in lco_csum()