Re: [PATCH] perf/x86/intel: Annotate x86_pmu::hybrid_pmu with __counted_by_ptr

[Ian Rogers]

On Fri, Sep 4, 2026 at 7:17 AM Thorsten Blum <blum@xxxxxxxxxx> wrote:
>
> Add __counted_by_ptr() to x86_pmu::hybrid_pmu to improve access bounds
> checking via CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE.
>
> Signed-off-by: Thorsten Blum <blum@xxxxxxxxxx>
> ---
>  arch/x86/events/perf_event.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
> index 71ed5b2acea2..b66691a4fc31 100644
> --- a/arch/x86/events/perf_event.h
> +++ b/arch/x86/events/perf_event.h
> @@ -1050,7 +1050,7 @@ struct x86_pmu {
>          * unique capabilities.
>          */
>         int                             num_hybrid_pmus;
> -       struct x86_hybrid_pmu           *hybrid_pmu;
> +       struct x86_hybrid_pmu           *hybrid_pmu __counted_by_ptr(num_hybrid_pmus);

Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>

Thanks,
Ian

>         enum intel_cpu_type (*get_hybrid_cpu_type)      (void);
>  };
>