__generic_copy_from_user(void *to, const void *from, unsigned long n)
__generic_copy_from_user(void *to, const void __user *from, unsigned long n)
__generic_copy_from_user(void *to, const void *from, unsigned long n){	prefetchw(to);	if (access_ok(VERIFY_READ, from, n))		__copy_user_zeroing(to,from,n);	else		memset(to, 0, n);	return n;}