linux-kernel - Re: [PATCH] perf/x86/intel/pt: Export cpu frequency ratios needed by PT decoders

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Date:	Fri, 28 Aug 2015 12:33:58 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...radead.org>
Subject: Re: [PATCH] perf/x86/intel/pt: Export cpu frequency ratios needed by PT decoders

Alexander Shishkin <alexander.shishkin@...ux.intel.com> writes:
> +		return sprintf(page, "%lu\n", val);
> +	case 1:
> +		cpuid(0x15, &eax, &ebx, &ecx, &edx);

Surely this needs to be protected by a cpuid level check?
Broadwell for once doesn't have CPUID 0x15.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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