Messages in this thread |  | | | Date | Thu, 4 Sep 2008 12:17:14 -0700 | | From | "Yinghai Lu" <> | | Subject | Re: [PATCH 5/6] x86: move mtrr cpu cap setting early in early_init_xxxx |
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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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