49 unsigned long clear_user(void __user *to, unsigned long n)  in clear_user()  argument
51 	if (access_ok(VERIFY_WRITE, to, n))  in clear_user()
52 		return __clear_user(to, n);  in clear_user()
57 unsigned long copy_in_user(void __user *to, const void __user *from, unsigned len)  in copy_in_user()  argument
59 	if (access_ok(VERIFY_WRITE, to, len) && access_ok(VERIFY_READ, from, len)) {   in copy_in_user()
60 		return copy_user_generic((__force void *)to, (__force void *)from, len);  in copy_in_user()
72 copy_user_handle_tail(char *to, char *from, unsigned len)  in copy_user_handle_tail()  argument
74 	for (; len; --len, to++) {  in copy_user_handle_tail()
79 		if (__put_user_nocheck(c, to, sizeof(char)))  in copy_user_handle_tail()
85 	if (!__addr_ok(to))  in copy_user_handle_tail()
86 		memset(to, 0, len);  in copy_user_handle_tail()