On 09/10/2014 02:27 PM, Andy Lutomirski wrote:
>>
>> That's possible, but the only benefit is that we can enable WT on
>> pre-PAT systems, which I do not think anyone cares now... WB & UC work
>> on pre-PAT systems. WC & WT need PAT. I think this requirement is
>> reasonable.
>
> It might end up being a cleanup, though. A whole bunch of
> rarely-exercised if (!pat_enabled) things would go away.
>
Yes. Don't think of it as PAT vs non-PAT. Think of it as a specific
set of cache types available on different processors. The fact that you
may have to frob an MSR to initialize it is almost trivial in comparison.
-hpa
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
