From 80391d8c387d406e2ec79776ec834666ab9611b0 Mon Sep 17 00:00:00 2001
From: James Clark <james.clark@arm.com>
Date: Mon, 24 Jul 2023 14:44:58 +0100
Subject: [PATCH] arm_pmu: Remove unused PERF_PMU_CAP_HETEROGENEOUS_CPUS
capability
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@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
---
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 2e79201daa4a..d712a19e47ac 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -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,
};