Re: [PATCH] perf/x86/intel: Use rdmsrl_safe when initializing RAPL PMU.

Borislav Petkov
2014-04-23T15:35:53Z

On Wed, Apr 23, 2014 at 05:18:29PM +0200, Stephane Eranian wrote:
> On Wed, Apr 23, 2014 at 5:16 PM, Borislav Petkov <bp@alien8.de> wrote:
> > On Wed, Apr 23, 2014 at 05:14:33PM +0200, Stephane Eranian wrote:
> >> Wouldn't rdmsrl_safe() return 0 on success?
> >
> > Yes.
> >
> then the if() test is wrong:
> if (!rdmsrl_safe())
> return -1;
>
> Should be:
> if (rdmsrl_safe())
> return -1;
>
> Or am I missing something?

Yeah, that is wrong:

if (!rdmsrl_safe(MSR_RAPL_POWER_UNIT, &msr_rapl_power_unit_bits))
return -1;

On error we return -EIO, on success 0. Just remove the "!".

--
Regards/Gruss,
Boris.

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