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SubjectRe: [PATCH 4/4] perf: Remove unused PERF_PMU_CAP_HETEROGENEOUS_CPUS capability
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On 7/10/23 17:51, James Clark 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>
> ---
> 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 */

Small nit, "Unused" marking might not be required here.

> #define PERF_PMU_CAP_NO_EXCLUDE 0x0080
> #define PERF_PMU_CAP_AUX_OUTPUT 0x0100
> #define PERF_PMU_CAP_EXTENDED_HW_TYPE 0x0200

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