13  * and adds in "sum" (32-bit)
23 asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum);
62 static inline __sum16 csum_fold(__wsum sum)  in csum_fold()  argument
72 		: "=r" (sum), "=&r" (__dummy)  in csum_fold()
73 		: "0" (sum)  in csum_fold()
75 	return (__force __sum16)sum;  in csum_fold()
87 	unsigned int sum, __dummy0, __dummy1;  in ip_fast_csum()  local
106 	: "=r" (sum), "=r" (iph), "=r" (ihl), "=&r" (__dummy0), "=&z" (__dummy1)  in ip_fast_csum()
110 	return	csum_fold(sum);  in ip_fast_csum()
115 					__wsum sum)  in csum_tcpudp_nofold()  argument
128 		: "=r" (sum), "=r" (len_proto)  in csum_tcpudp_nofold()
129 		: "r" (daddr), "r" (saddr), "1" (len_proto), "0" (sum)  in csum_tcpudp_nofold()
132 	return sum;  in csum_tcpudp_nofold()
141 					__wsum sum)  in csum_tcpudp_magic()  argument
143 	return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));  in csum_tcpudp_magic()
158 				      __u32 len, __u8 proto, __wsum sum)  in csum_ipv6_magic()  argument
182 		: "=r" (sum), "=&r" (__dummy)  in csum_ipv6_magic()
184 		  "r" (htonl(len)), "r" (htonl(proto)), "0" (sum)  in csum_ipv6_magic()
187 	return csum_fold(sum);  in csum_ipv6_magic()