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SubjectRe: [patch/rfc] perf on raspberry-pi without overflow interrupt
On Thu, 9 Jan 2014, Will Deacon wrote:

> I'd rather see it in the generic code if at all possible. Maybe we could add
> a flags field to perf_pmu_register?

I can look into adding the check in generic code.

In the meantime, would you consider a patch like this that disables
the IRQ check and lets ARM devices missing an IRQ (such as the rasp-pi)
still have access to the counters?


diff --git a/arch/arm/kernel/perf_event_cpu.c b/arch/arm/kernel/perf_event_cpu.c
index d85055c..ff1a752 100644
--- a/arch/arm/kernel/perf_event_cpu.c
+++ b/arch/arm/kernel/perf_event_cpu.c
@@ -97,8 +97,8 @@ static int cpu_pmu_request_irq(struct arm_pmu *cpu_pmu, irq_handler_t handler)

irqs = min(pmu_device->num_resources, num_possible_cpus());
if (irqs < 1) {
- pr_err("no irqs for PMUs defined\n");
- return -ENODEV;
+ printk_once("no irqs for PMUs defined, sampling events not supported\n");
+ return 0;
}

for (i = 0; i < irqs; ++i) {


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