linux-kernel - [PATCH 18/25] perf: arm_pmu: Request specific affinities for percpu NMI/IRQ

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Message-Id: <20250908163127.2462948-19-maz@kernel.org>
Date: Mon,  8 Sep 2025 17:31:20 +0100
From: Marc Zyngier <maz@...nel.org>
To: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-acpi@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Mark Rutland <mark.rutland@....com>,
	Will Deacon <will@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sven Peter <sven@...nel.org>,
	Janne Grunau <j@...nau.net>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	James Clark <james.clark@...aro.org>
Subject: [PATCH 18/25] perf: arm_pmu: Request specific affinities for percpu NMI/IRQ

Let the PMU driver request both NMI and normal IRQs with an affinity
mask matching the PMU affinity.

Signed-off-by: Marc Zyngier <maz@...nel.org>
---
 drivers/perf/arm_pmu.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 044c9c6296997..0d64e929d9bf0 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -679,13 +679,14 @@ int armpmu_request_irq(struct arm_pmu * __percpu *armpmu, int irq, int cpu)
 		}
 	} else if (armpmu_count_irq_users(cpu, irq) == 0) {
 		err = request_percpu_nmi(irq, handler, "arm-pmu",
-					 NULL,
-					 &cpu_armpmu);
+					 per_cpu(pmu_affinity, cpu),
+					 armpmu);
 
 		/* If cannot get an NMI, get a normal interrupt */
 		if (err) {
-			err = request_percpu_irq(irq, handler, "arm-pmu",
-						 &cpu_armpmu);
+			err = request_percpu_irq_affinity(irq, handler, "arm-pmu",
+							  per_cpu(pmu_affinity, cpu),
+							  armpmu);
 			irq_ops = &percpu_pmuirq_ops;
 		} else {
 			has_nmi = true;
-- 
2.39.2