PMU interrupts must not be threaded. Signed-off-by: Thomas Gleixner --- arch/arm/kernel/perf_event_cpu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: linux-2.6/arch/arm/kernel/perf_event_cpu.c =================================================================== --- linux-2.6.orig/arch/arm/kernel/perf_event_cpu.c +++ linux-2.6/arch/arm/kernel/perf_event_cpu.c @@ -118,7 +118,8 @@ static int cpu_pmu_request_irq(struct ar continue; } - err = request_irq(irq, handler, IRQF_NOBALANCING, "arm-pmu", + err = request_irq(irq, handler, + IRQF_NOBALANCING | IRQF_NO_THREAD, "arm-pmu", cpu_pmu); if (err) { pr_err("unable to request IRQ%d for ARM PMU counters\n",