Re: [PATCH 2/3] x86/split_lock: Bits in IA32_CORE_CAPABILITIES are not architectural

[Thomas Gleixner]

Tony Luck <tony.luck@xxxxxxxxx> writes:
> +	m = x86_match_cpu(split_lock_cpu_ids);
> +	if (!m)
> +		return;
> +
> +	if (m->driver_data && cpu_has(c, X86_FEATURE_CORE_CAPABILITIES))
> {

This condition results in the following:

    driver_data     MSR_CORE_CAPS	 MSR_CORE_CAPS_SLD	SLD available

1       0             Don't care          Don't care               Y
2       1                N                Don't care               Y
3       1                Y                    Y                    Y
4       1                Y                    N                    N

#2 does not make any sense to me.

Thanks,

        tglx