Re: [PATCH 10/15] hwmon, fam15h_power: add compute unit accumulated power

[Huang Rui <ray.huang@amd.com>]

On Fri, Aug 28, 2015 at 10:03:35AM +0200, Ingo Molnar wrote:
> 
> * Huang Rui <ray.huang@amd.com> wrote:
> 
> > @@ -249,6 +254,21 @@ static int fam15h_power_init_data(struct pci_dev *f4,
> >  
> >  	data->max_cu_acc_power = tmp;
> >  
> > +	cores_per_cu = amd_get_cores_per_cu();
> > +	cu_num = boot_cpu_data.x86_max_cores / cores_per_cu;
> > +
> > +	WARN_ON_ONCE(cu_num > MAX_CUS);
> > +
> > +	for (cpu = 0; cpu < cu_num * cores_per_cu; cpu += cores_per_cu) {
> 
> so 'cu_num * cores_per_cu' is really a roundabout way to say 
> boot_cpu_data.x86_max_cores?
> 

Oh, yes. :)
I will update it at v2.

> > +		cu = cpu / cores_per_cu;
> > +		if (rdmsrl_safe_on_cpu(cpu, MSR_F15H_CU_PWR_ACCUMULATOR,
> > +				       &data->cu_acc_power[cu])) {
> > +			pr_err("Failed to read compute unit power accumulator MSR on core%d\n",
> > +			       cpu);
> 
> Please don't break printk lines mid-line - ignore checkpatch in this case.
> 

OK, I got it.

> Also, the message talks about 'core', while a CPU ID is printed.
> 

Yes, but actually this value is for the compute unit which the core
belongs to.
E.X. the MSR_F15H_CU_PWR_ACCUMULATOR value is the same between core 0
and core 1. Because they belong to the same compute unit.

Thanks,
Rui