linux-kernel - Re: [BUG] perf/x86: Intel uncore_pmu_to

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Message-ID: <20120925115711.GB25264@gmail.com>
Date:	Tue, 25 Sep 2012 13:57:11 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Yan, Zheng" <zheng.z.yan@...el.com>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"mingo@...e.hu" <mingo@...e.hu>
Subject: Re: [BUG] perf/x86: Intel uncore_pmu_to_box() local variable typo


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Tue, 2012-09-25 at 12:44 +0200, Stephane Eranian wrote:
> > Hi,
> > 
> > I don't understand why the local variable box needs to
> > be declared static here:
> > 
> > static struct intel_uncore_box *
> > uncore_pmu_to_box(struct intel_uncore_pmu *pmu, int cpu)
> > {
> >         static struct intel_uncore_box *box;
> > 
> >         box = *per_cpu_ptr(pmu->box, cpu);
> >         if (box)
> >                 return box;
> >         ....
> > }
> 
> Uhmm.. me neither.. that looks like a bug indeed.

the compiler (or Sparse) should refuse function local statics 
really.

Thanks,

	Ingo
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