linux-kernel - Re: [PATCH v8 12/14] x86: perf: intel

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Message-ID: <20150112164040.GG25256@twins.programming.kicks-ass.net>
Date:	Mon, 12 Jan 2015 17:40:40 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Robert Richter <rric@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>, kan.liang@...el.com,
	adrian.hunter@...el.com, markus.t.metzger@...el.com,
	mathieu.poirier@...aro.org, acme@...radead.org
Subject: Re: [PATCH v8 12/14] x86: perf: intel_pt: Intel PT PMU driver

On Mon, Jan 12, 2015 at 06:37:36PM +0200, Alexander Shishkin wrote:
> Peter Zijlstra <peterz@...radead.org> writes:
> 
> > Also, if its already enabled, should we not return ENODEV as well, no
> > saying who or what programmed it, we should not be touching it.
> 
> Or EBUSY?

Sure, same end result I imagine, driver doesn't load.
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