Re: [PATCH v5 09/15] coresight: trbe: Add infrastructure for Errata handling

[Suzuki K Poulose]

Hi Arnd

Thanks for the report.

On 29/10/2021 11:31, Arnd Bergmann wrote:
> On Fri, Oct 15, 2021 at 12:31 AM Suzuki K Poulose
> <suzuki.poulose@xxxxxxx> wrote:
> > +static void trbe_check_errata(struct trbe_cpudata *cpudata)
> > +{
> > +       int i;
> > +
> > +       for (i = 0; i < TRBE_ERRATA_MAX; i++) {
> > +               int cap = trbe_errata_cpucaps[i];
> > +
> > +               if (WARN_ON_ONCE(cap < 0))
> > +                       return;
> > +               if (this_cpu_has_cap(cap))
> > +                       set_bit(i, cpudata->errata);
> > +       }
> > +}
>
> this_cpu_has_cap() is private to arch/arm64 and not exported, so this causes
> a build failure when used from a loadable module:
>
> ERROR: modpost: "this_cpu_has_cap"
> [drivers/hwtracing/coresight/coresight-trbe.ko] undefined!
>
> Should this symbol be exported or do we need a different workaround?

This should be exported. I can send in a patch.

Suzuki