From: Li RongQing <roy.qing...@gmail.com>
when there are 4 cpus, but only one is available to schedule, the warning
will be generated when run the below command:
# perf record -g -e cpu-clock -- find / -name "*.ko"
CPU PMU: unable to set irq affinity (irq=28, cpu=1)
CPU PMU: unable to set irq affinity (irq=29, cpu=2)
CPU PMU: unable to set irq affinity (irq=30, cpu=3)
so ensure the cpu is available to scheduler when set irq affinity
Signed-off-by: Li RongQing <roy.qing...@gmail.com>
---
drivers/perf/arm_pmu.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 2365a32..9401aa8 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -619,6 +619,9 @@ static void cpu_pmu_free_irq(struct arm_pmu *cpu_pmu)
if (cpu_pmu->irq_affinity)
cpu = cpu_pmu->irq_affinity[i];
+ if (!cpu_online(cpu))
+ continue;
+
if (!cpumask_test_and_clear_cpu(cpu,
&cpu_pmu->active_irqs))
continue;
irq = platform_get_irq(pmu_device, i);
@@ -665,6 +668,9 @@ static int cpu_pmu_request_irq(struct arm_pmu *cpu_pmu,
irq_handler_t handler)
if (cpu_pmu->irq_affinity)
cpu = cpu_pmu->irq_affinity[i];
+ if (!cpu_online(cpu))
+ continue;
+
/*
* If we have a single PMU interrupt that we can't
shift,
* assume that we're running on a uniprocessor machine
and
--
2.1.4
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