46 static unsigned long do_csum(const unsigned char * buff, int len)  in do_csum()  argument
51 	if (len <= 0)  in do_csum()
56 		len--;  in do_csum()
59 	count = len >> 1;		/* nr of 16-bit words.. */  in do_csum()
64 			len -= 2;  in do_csum()
81 		if (len & 2) {  in do_csum()
86 	if (len & 1)  in do_csum()
107 __wsum csum_partial(const void *buff, int len, __wsum sum)  in csum_partial()  argument
109 	unsigned int result = do_csum(buff, len);  in csum_partial()
124 __sum16 ip_compute_csum(const void *buff, int len)  in ip_compute_csum()  argument
126 	return (__force __sum16)~do_csum(buff, len);  in ip_compute_csum()
136 			    int len, __wsum sum, int *csum_err)  in csum_partial_copy_from_user()  argument
143 	rem = copy_from_user(dst, src, len);  in csum_partial_copy_from_user()
147 		memset(dst + len - rem, 0, rem);  in csum_partial_copy_from_user()
148 		len = rem;  in csum_partial_copy_from_user()
151 	return csum_partial(dst, len, sum);  in csum_partial_copy_from_user()
160 csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)  in csum_partial_copy_nocheck()  argument
162 	memcpy(dst, src, len);  in csum_partial_copy_nocheck()
163 	return csum_partial(dst, len, sum);  in csum_partial_copy_nocheck()