ARM: 5959/1: ARM: perf-events: request PMU interrupts with IRQF_NOBALANCING

If IRQ balancing is used on a multicore ARM system, PMU interrupt
lines may be relocated onto CPUs other than the one causing the
counter overflow. This can result in misattribution of events to
the wrong core and, in the case that the CPU handling the interrupt
has not experience counter overflow, the interrupt can be disabled
because the handler returns IRQ_NONE.

This patch adds the IRQF_NOBALANCING flag to the request_irq call
in perf_events.c.

Acked-by: Jamie Iles <jamie.iles@picochip.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index c54ceb3d1f978e1d260161ab9e3cb2b42dfeb93d..b44d15948b56e3a0f70efba47bec30d217a09e4e 100644 (file)
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -332,7 +332,8 @@ armpmu_reserve_hardware(void)
 
        for (i = 0; i < pmu_irqs->num_irqs; ++i) {
                err = request_irq(pmu_irqs->irqs[i], armpmu->handle_irq,
-                                 IRQF_DISABLED, "armpmu", NULL);
+                                 IRQF_DISABLED | IRQF_NOBALANCING,
+                                 "armpmu", NULL);
                if (err) {
                        pr_warning("unable to request IRQ%d for ARM "
                                   "perf counters\n", pmu_irqs->irqs[i]);