class_err = class_device_create(cpuid_class, MKDEV(CPUID_MAJOR, i), NULL, "cpu%d",i);
class_err = class_device_create(cpuid_class, NULL, MKDEV(CPUID_MAJOR, i), NULL, "cpu%d",i);
static int cpuid_class_device_create(int i){	int err = 0;	struct class_device *class_err;	class_err = class_device_create(cpuid_class, MKDEV(CPUID_MAJOR, i), NULL, "cpu%d",i);	if (IS_ERR(class_err))		err = PTR_ERR(class_err);	return err;}