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

From	"Suzuki K. Poulose" <Suzuki.Poulose@arm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2 07/22] arm64: Keep track of CPU feature registers
Date	2015-10-12 19:10 +0200
Message-ID	<qiOLM-5l6-21@gated-at.bofh.it> (permalink)
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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.

Mark,

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

Thanks
Suzuki

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Thread

Re: [PATCH v2 07/22] arm64: Keep track of CPU feature registers Catalin Marinas <catalin.marinas@arm.com> - 2015-10-07 19:20 +0200
  Re: [PATCH v2 07/22] arm64: Keep track of CPU feature registers "Suzuki K. Poulose" <Suzuki.Poulose@arm.com> - 2015-10-08 12:00 +0200
    Re: [PATCH v2 07/22] arm64: Keep track of CPU feature registers Catalin Marinas <catalin.marinas@arm.com> - 2015-10-08 17:10 +0200
      Re: [PATCH v2 07/22] arm64: Keep track of CPU feature registers "Suzuki K. Poulose" <Suzuki.Poulose@arm.com> - 2015-10-09 15:10 +0200
      Re: [PATCH v2 07/22] arm64: Keep track of CPU feature registers "Suzuki K. Poulose" <Suzuki.Poulose@arm.com> - 2015-10-12 19:10 +0200
        Re: [PATCH v2 07/22] arm64: Keep track of CPU feature registers Mark Rutland <mark.rutland@arm.com> - 2015-10-12 19:30 +0200
          Re: [PATCH v2 07/22] arm64: Keep track of CPU feature registers Catalin Marinas <catalin.marinas@arm.com> - 2015-10-13 11:50 +0200
    Re: [PATCH v2 07/22] arm64: Keep track of CPU feature registers "Suzuki K. Poulose" <Suzuki.Poulose@arm.com> - 2015-10-09 13:00 +0200
      Re: [PATCH v2 07/22] arm64: Keep track of CPU feature registers Catalin Marinas <catalin.marinas@arm.com> - 2015-10-09 16:20 +0200

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