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arm_pmu: Remove unused PERF_PMU_CAP_HETEROGENEOUS_CPUS capability

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Since commit bd27568117 ("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@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20230724134500.970496-4-james.clark@arm.com
This commit is contained in:
James Clark 2023-07-24 14:44:58 +01:00 committed by Peter Zijlstra
parent 4b36873b4a
commit 80391d8c38
1 changed files with 2 additions and 5 deletions
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7
drivers/perf/arm_pmu.c
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@ -877,15 +877,12 @@ 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
* 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,
};