linux-kernel - Re: Drop WARN on AMD lack of perfctrs

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Date:	Fri, 17 May 2013 11:45:51 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Robert Richter <rric@...nel.org>, Josh Boyer <jwboyer@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	x86@...nel.org, linux-kernel@...r.kernel.org, gleb@...hat.com
Subject: Re: Drop WARN on AMD lack of perfctrs

On Fri, May 17, 2013 at 11:27:41AM +0200, Peter Zijlstra wrote:
> But not all x86 hardware even has the stuff enumerated in CPUID, and
> afaict Intel and AMD use a different CPUID bit as well, so what's
> init_hw_perf_events() to do?

Yeah, I think the best solution would be if we force-enable the CPUID
bit on F10h very early and teach amd_pmu_init() to look at it. I even
had a patch which does something like that. I could dust it off and give
it a try... I just hope we can actually enable a reserved bit in CPUID.

:-)

-- 
Regards/Gruss,
    Boris.

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