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

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Message-ID: <1340790167.10063.3.camel@twins>
Date:	Wed, 27 Jun 2012 11:42:47 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	eranian@...gle.com, mingo@...e.hu, andi@...stfloor.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] perf/x86: Uncore Filter support for SandyBridge-EP

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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