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    SubjectRe: [PATCH 5/6] x86: move mtrr cpu cap setting early in early_init_xxxx
    On Thu, Sep 4, 2008 at 12:13 PM, Ingo Molnar <mingo@elte.hu> wrote:
    >
    > * Yinghai Lu <yhlu.kernel@gmail.com> wrote:
    >
    >> Krzysztof Helt <krzysztof.h1@wp.pl> found mtrr is not detected on k6-2
    >>
    >> root case:
    >> we move mtrr_bp_init early for mtrr trimming.
    >> and in early_detect, only read cap from cpuid, so some cpu doesn't have
    >> that bit in cpuid and need to set workaround bit will have problem.
    >>
    >> need to add early_init_xxxx to preset those bit before mtrr_bp_init
    >> for those earlier cpus.
    >>
    >> this patch is for 2.6.27
    >
    > hm, not sure we can do it in v2.6.27 as it depends on the other CPU init
    > patches and that is a rather sensitive codepath. This problem should be
    > present in v2.6.26 too, right?

    Yes. old cpus without cpuid bit for mtrr need this patch...
    Krzysztof Helt tested it and it works with 2.6.27-rc5 (?)


    YH


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