Re: [Xen-devel] [PATCH v3 10/11] x86/intel_pstate: support the use of intel_pstate in pmstat.c

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi,

On 11/06/2015 23:03, Wang, Wei W wrote:
> On 11/06/2015 22:02, Julien Grall wrote:
> > On 11/06/2015 04:31, Wei Wang wrote:
> > > -    list_for_each(pos, &cpufreq_governor_list)
> > > +    if (policy->policy)
> > What if another cpufreq decides to use policy->policy?
> What is "another cpufreq"? The "policy" is per-CPU struct.
I mean another cpufreq driver. Correct me if I'm wrong but from the name 
policy is not intel pstate specific. That means that a new cpufreq 
driver can decide to use the field his own purpose..
>   > > +        gov_num = INTEL_PSTATE_INTERNAL_GOV_NUM;
> > Why not using cpufreq_governor_list?
> That's used by the old driver. We are not going through that old governor layer.
This is common code, it's used by different cpufreq driver for both x86 
and ARM (not yet supported). We should not relying on any other cpufreq 
driver won't use the field policy.
Regards,

--
Julien Grall

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