Re: [Xen-devel] kernel 3.7+ cpufreq regression on AMD systemrunning as dom0

[Jan Beulich]

>>> On 14.01.13 at 17:34, Borislav Petkov <bp@xxxxxxxxx> wrote:
> On Mon, Jan 14, 2013 at 04:58:54PM +0100, Stefan Bader wrote:
>> --- a/drivers/acpi/processor_perflib.c
>> +++ b/drivers/acpi/processor_perflib.c
>> @@ -340,6 +340,9 @@ static void amd_fixup_frequency(struct acpi_processor_px 
> *px
>>         if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
>>             || boot_cpu_data.x86 == 0x11) {
>>                 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
>> +               /* Bit 63 indicates whether contents are valid */
>> +               if (!(hi & 0x8000000))
>> +                       return;
> 
> I don't think that's the right change - this is fixing baremetal so that
> it works on xen. And besides, this code was in powernow-k8 before so I'm
> wondering why did it work then.

Because the driver doesn't get loaded in that case?

Jan

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