···4444module_param_named(msr, use_msr, int, 0644);4545MODULE_PARM_DESC(msr, "Force using MSR to configure IDE function (Default: 0)");4646#else4747+#undef rdmsr /* avoid accidental MSR usage on, e.g. x86-64 */4848+#undef wrmsr4749#define rdmsr(x, y, z) do { } while (0)4850#define wrmsr(x, y, z) do { } while (0)4951#define use_msr 0