Re: [PATCH 9/9] arm64: Documentation - Expose CPU feature registers

[Suzuki K Poulose]

On 30/11/16 11:14, Siddhesh Poyarekar wrote:
> On Thursday 24 November 2016 07:10 PM, Suzuki K Poulose wrote:
> > + d) CPU Identification :
> > +    MIDR_EL1 is exposed to help identify the processor. On a
> > +    heterogeneous system, this could be racy (just like getcpu()). The
> > +    process could be migrated to another CPU by the time it uses the
> > +    register value, unless the CPU affinity is set. Hence, there is no
> > +    guarantee that the value reflects the processor that it is
> > +    currently executing on. The REVIDR is not exposed due to this
> > +    constraint, as REVIDR makes sense only in conjunction with the
> > +    MIDR. Alternately, MIDR_EL1 and REVIDR_EL1 are exposed via sysfs
> > +    at:
> > +
> > +    /sys/devices/system/cpu/cpu$ID/regs/identification/
> > +                                                  \- midr
> > +                                                  \- revidr
> > +
>
> This doesn't seem to be implemented in this patchset.

This is already available upstream.

Thanks
Suzuki

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