[PATCH 3/4] arm_pmu: Remove unused PERF_PMU_CAP_HETEROGENEOUS_CPUS capability
Anshuman Khandual
anshuman.khandual at arm.com
Tue Jul 11 05:08:51 PDT 2023
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 and associated comment 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 at arm.com>
> ---
> drivers/perf/arm_pmu.c | 7 ++-----
> 1 file changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
> index d8844a9461a2..297906df6628 100644
> --- a/drivers/perf/arm_pmu.c
> +++ b/drivers/perf/arm_pmu.c
> @@ -872,15 +872,12 @@ struct arm_pmu *armpmu_alloc(void)
> .attr_groups = pmu->attr_groups,
> /*
> * This is a CPU PMU potentially in a heterogeneous
> - * configuration (e.g. big.LITTLE). This is not an uncore PMU,
> - * and we have taken ctx sharing into account (e.g. with our
> - * pmu::filter callback and pmu::event_init group validation).
> - *
> + * configuration (e.g. big.LITTLE) so
> * PERF_PMU_CAP_EXTENDED_HW_TYPE is required to open the legacy
> * PERF_TYPE_HARDWARE and PERF_TYPE_HW_CACHE events on a
> * specific PMU.
> */
> - .capabilities = PERF_PMU_CAP_HETEROGENEOUS_CPUS | PERF_PMU_CAP_EXTENDED_REGS |
> + .capabilities = PERF_PMU_CAP_EXTENDED_REGS |
> PERF_PMU_CAP_EXTENDED_HW_TYPE,
Small nit, the second line could be folded back into the first one.
> };
>
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