Re: [PATCH 3/4] perf_counter: frequency based adaptive irq_period

[Ingo Molnar]

* Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote:

> @@ -2907,6 +2940,12 @@ perf_counter_alloc(struct perf_counter_h
>  
>  	pmu = NULL;
>  
> +	hwc = &counter->hw;
> +	if (hw_event->freq && hw_event->irq_freq)
> +		hwc->irq_period = TICK_NSEC / hw_event->irq_freq;

this needs to use a 64-bit do_div method too, otherwise we get this 
on 32-bit:

 kernel/built-in.o: In function `perf_counter_alloc':
 perf_counter.c:(.text+0x7ddc7): undefined reference to `__udivdi3'

	Ingo
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