csum_sub         2179 include/linux/netdevice.h 		NAPI_GRO_CB(skb)->csum = csum_sub(NAPI_GRO_CB(skb)->csum,
csum_sub         2550 include/linux/skbuff.h 		skb->csum = csum_sub(skb->csum, csum_partial(start, len, 0));
csum_sub          108 include/net/checksum.h 	return csum_sub(csum, (__force __wsum)sum);
csum_sub          125 include/net/checksum.h 	*sum = csum_fold(csum_add(csum_sub(~csum_unfold(*sum), from), to));