[PATCH v2 07/22] arm64: Keep track of CPU feature registers

Suzuki K. Poulose Suzuki.Poulose at arm.com
Mon Oct 12 10:01:25 PDT 2015

On 08/10/15 16:03, Catalin Marinas wrote:
> On Thu, Oct 08, 2015 at 10:55:11AM +0100, Suzuki K. Poulose wrote:

> So we have three types of fields in these registers:
> a) features defined but not something we care about in Linux
> b) reserved fields
> c) features important to Linux
> I guess for (a), Linux may not even care if they don't match (though we
> need to be careful which fields we ignore). As for (b), even if they
> differ, since we don't know the meaning at this point, I think we should
> just ignore them. If, for example, they add a feature that Linux doesn't
> care about, they practically fall under the (a) category.
> Regarding exposing reserved CPUID fields to user, I assume we would
> always return 0.


Do you have any comments on this ? The list I have here is what you came
up with in SANITY checks.


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