linux-kernel - Re: [PATCH 16/16] perf, persistent: Allow multiple users for an event

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Message-ID: <20130607134716.GG3886@rric.localhost>
Date:	Fri, 7 Jun 2013 15:47:16 +0200
From:	Robert Richter <rric@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 16/16] perf, persistent: Allow multiple users for an event

On 04.06.13 11:35:22, Borislav Petkov wrote:
> On Tue, Jun 04, 2013 at 11:19:21AM +0200, Jiri Olsa wrote:
> > 'cpu' did not pass ay check here..
> 
> Oh, I see.
> 
> You mean something like
> 
> 	if (cpu < NR_CPUS && cpu_online(cpu))

In perf_event_alloc() there is:

        if ((unsigned)cpu >= nr_cpu_ids) {
                if (!task || cpu != -1)
                        return ERR_PTR(-EINVAL);
        }

So this should be sufficient:

	if ((unsigned)cpu >= nr_cpu_ids)
		...

-Robert
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