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

[Arnd Bergmann]

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?

       Arnd