46 static unsigned long do_csum(const unsigned char * buff, int len)  in do_csum()  argument
53 	odd = 1 & (unsigned long) buff;  in do_csum()
55 		result = *buff;  in do_csum()
57 		buff++;  in do_csum()
61 		if (2 & (unsigned long) buff) {  in do_csum()
62 			result += *(unsigned short *) buff;  in do_csum()
65 			buff += 2;  in do_csum()
71 				unsigned long w = *(unsigned long *) buff;  in do_csum()
73 				buff += 4;  in do_csum()
82 			result += *(unsigned short *) buff;  in do_csum()
83 			buff += 2;  in do_csum()
87 		result += (*buff << 8);  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()