Re: [PATCH v2 4/4] perf: Remove unused PERF_PMU_CAP_HETEROGENEOUS_CPUS capability

[Anshuman Khandual <anshuman.khandual@arm.com>]

On 7/24/23 19:14, 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 and shift down the following capability bits to
> fill in the unused space. This change should be a no-op.
> 
> Acked-by: Ian Rogers <irogers@google.com>
> Signed-off-by: James Clark <james.clark@arm.com>

Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>

> ---
>  include/linux/perf_event.h | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
> index 2166a69e3bf2..c617badd1e76 100644
> --- a/include/linux/perf_event.h
> +++ b/include/linux/perf_event.h
> @@ -288,10 +288,9 @@ 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
> -#define PERF_PMU_CAP_NO_EXCLUDE			0x0080
> -#define PERF_PMU_CAP_AUX_OUTPUT			0x0100
> -#define PERF_PMU_CAP_EXTENDED_HW_TYPE		0x0200
> +#define PERF_PMU_CAP_NO_EXCLUDE			0x0040
> +#define PERF_PMU_CAP_AUX_OUTPUT			0x0080
> +#define PERF_PMU_CAP_EXTENDED_HW_TYPE		0x0100
>  
>  struct perf_output_handle;
>