ia64: copy_from_user() should zero the destination on access_ok() failure

	__cu_len;									\

})

#define copy_from_user(to, from, n)							\

({											\

	void *__cu_to = (to);								\

	const void __user *__cu_from = (from);						\

	long __cu_len = (n);								\

											\

	__chk_user_ptr(__cu_from);							\

	if (__access_ok(__cu_from, __cu_len, get_fs())) {				\

		if (!__builtin_constant_p(n))						\

			check_object_size(__cu_to, __cu_len, false);			\

		__cu_len = __copy_user((__force void __user *) __cu_to, __cu_from, __cu_len);	\

	}										\

	__cu_len;									\

})

static inline unsigned long

copy_from_user(void *to, const void __user *from, unsigned long n)

{

	if (!__builtin_constant_p(n))

		check_object_size(to, n, false);

	if (likely(__access_ok(from, n, get_fs())))

		n = __copy_user((__force void __user *) to, from, n);

	else

		memset(to, 0, n);

	return n;

}

#define __copy_in_user(to, from, size)	__copy_user((to), (from), (size))