Re: [PATCH 5/6] x86: move mtrr cpu cap setting early in early_init_xxxx

[Yinghai Lu]

On Thu, Sep 4, 2008 at 12:13 PM, Ingo Molnar <mingo@xxxxxxx> wrote:
>
> * Yinghai Lu <yhlu.kernel@xxxxxxxxx> wrote:
>
>> Krzysztof Helt <krzysztof.h1@xxxxx> 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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