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    SubjectRe: [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture
    On Wed, Sep 21, 2022 at 07:15:07AM -0700, Dave Hansen wrote:
    > In the end, the delay is because of buggy, circa 2006 chipsets? So, we
    > use a CPU vendor specific check to approximate that the chipset is
    > recent and not affected by the bug? If so, is there no better way to
    > check for a newer chipset than this?

    So I did some git archeology but that particular addition is in some
    conglomerate, glued-together patch from 2007 which added the cpuidle
    tree:

    commit 4f86d3a8e297205780cca027e974fd5f81064780
    Author: Len Brown <len.brown@intel.com>
    Date: Wed Oct 3 18:58:00 2007 -0400

    cpuidle: consolidate 2.6.22 cpuidle branch into one patch


    so the most precise check here should be to limit that dummy read to
    that Intel chipset which needed it. Damned if I knew how to figure out
    which...

    --
    Regards/Gruss,
    Boris.

    https://people.kernel.org/tglx/notes-about-netiquette

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