Re: [PATCH 2/2] perf/x86: Uncore Filter support for SandyBridge-EP

[Peter Zijlstra]

On Wed, 2012-06-27 at 15:09 +0800, Yan, Zheng wrote:
> +static void snbep_uncore_put_constraint(struct intel_uncore_box *box,
> +                                       struct perf_event *event)
> +{
> +       struct intel_uncore_extra_reg *er;
> +       struct hw_perf_event_extra *reg1 = &event->hw.extra_reg;
> +
> +       if (box->phys_id < 0 || !reg1->alloc)
> +               return;
> +
> +       er = &box->shared_regs[reg1->idx];
> +       atomic_sub(1, &er->ref);

We have atomic_dec() for this ;-)

> +       reg1->alloc = 0;
> +} 
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