20  * and adds in "sum" (32-bit).
30 static inline __wsum csum_partial(const void *buff, int len, __wsum sum)  in csum_partial()  argument
38 		: "+d" (sum), "+d" (reg2), "+d" (reg3) : : "cc", "memory");  in csum_partial()
39 	return sum;  in csum_partial()
45 static inline __sum16 csum_fold(__wsum sum)  in csum_fold()  argument
47 	u32 csum = (__force u32) sum;  in csum_fold()
79 					__u8 proto, __wsum sum)  in csum_tcpudp_nofold()  argument
81 	__u64 csum = (__force __u64)sum;  in csum_tcpudp_nofold()
96 					__u8 proto, __wsum sum)  in csum_tcpudp_magic()  argument
98 	return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));  in csum_tcpudp_magic()
114 	__u64 sum = (__force __u64)csum;  in csum_ipv6_magic()  local
116 	sum += (__force __u32)saddr->s6_addr32[0];  in csum_ipv6_magic()
117 	sum += (__force __u32)saddr->s6_addr32[1];  in csum_ipv6_magic()
118 	sum += (__force __u32)saddr->s6_addr32[2];  in csum_ipv6_magic()
119 	sum += (__force __u32)saddr->s6_addr32[3];  in csum_ipv6_magic()
120 	sum += (__force __u32)daddr->s6_addr32[0];  in csum_ipv6_magic()
121 	sum += (__force __u32)daddr->s6_addr32[1];  in csum_ipv6_magic()
122 	sum += (__force __u32)daddr->s6_addr32[2];  in csum_ipv6_magic()
123 	sum += (__force __u32)daddr->s6_addr32[3];  in csum_ipv6_magic()
124 	sum += len;  in csum_ipv6_magic()
125 	sum += proto;  in csum_ipv6_magic()
126 	sum += (sum >> 32) | (sum << 32);  in csum_ipv6_magic()
127 	return csum_fold((__force __wsum)(sum >> 32));  in csum_ipv6_magic()