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

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Message-ID: <20130604093522.GD23640@pd.tnic>
Date:	Tue, 4 Jun 2013 11:35:22 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Robert Richter <rric@...nel.org>, Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org,
	Robert Richter <robert.richter@...xeda.com>
Subject: Re: [PATCH 16/16] perf, persistent: Allow multiple users for an event

On Tue, Jun 04, 2013 at 11:19:21AM +0200, Jiri Olsa wrote:
> hum, can't see it:
> 
> perf SYSCALL:
> ...
> 	return perf_get_persistent_event_fd(cpu, &attr);
> 
> ...
> int perf_get_persistent_event_fd(unsigned cpu, struct perf_event_attr *attr)
> {
>         struct pers_event_desc *desc;
>         struct perf_event *event;
>         int event_fd = -ENODEV;
> 
>         mutex_lock(&per_cpu(pers_events_lock, cpu));
> ...
> 
> 'cpu' did not pass ay check here..

Oh, I see.

You mean something like

	if (cpu < NR_CPUS && cpu_online(cpu))

?

I guess that should cover your concerns...

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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