Re: [PATCH 4/4] perf: Remove unused PERF_PMU_CAP_HETEROGENEOUS_CPUS capability

[Ian Rogers <irogers@google.com>]

On Mon, Jul 10, 2023 at 5:22 AM James Clark <james.clark@arm.com> wrote:
>
> Since commit bd2756811766 ("perf: Rewrite core context handling") the
> relationship between perf_event_context and PMUs has changed so that
> the error scenario that PERF_PMU_CAP_HETEROGENEOUS_CPUS originally
> silenced no longer exists.
>
> Remove the capability to avoid confusion that it actually influences
> any perf core behavior. This change should be a no-op.
>
> Signed-off-by: James Clark <james.clark@arm.com>

Acked-by: Ian Rogers <irogers@google.com>

Thanks,
Ian

> ---
>  include/linux/perf_event.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
> index d5628a7b5eaa..3f4d941fd6c5 100644
> --- a/include/linux/perf_event.h
> +++ b/include/linux/perf_event.h
> @@ -288,7 +288,7 @@ struct perf_event_pmu_context;
>  #define PERF_PMU_CAP_EXTENDED_REGS             0x0008
>  #define PERF_PMU_CAP_EXCLUSIVE                 0x0010
>  #define PERF_PMU_CAP_ITRACE                    0x0020
> -#define PERF_PMU_CAP_HETEROGENEOUS_CPUS                0x0040
> +/* Unused                                      0x0040 */
>  #define PERF_PMU_CAP_NO_EXCLUDE                        0x0080
>  #define PERF_PMU_CAP_AUX_OUTPUT                        0x0100
>  #define PERF_PMU_CAP_EXTENDED_HW_TYPE          0x0200
> --
> 2.34.1
>