[PATCH 18/25] perf: arm_pmu: Request specific affinities for percpu NMI/IRQ
From: Marc Zyngier <maz@kernel.org>
Date: 2025-09-08 16:31:52
Also in:
linux-acpi, lkml
Subsystem:
arm pmu profiling and debugging, the rest · Maintainers:
Will Deacon, Mark Rutland, Linus Torvalds
Let the PMU driver request both NMI and normal IRQs with an affinity mask matching the PMU affinity. Signed-off-by: Marc Zyngier <maz@kernel.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