linux-kernel - Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge

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Date:	Thu, 7 Jun 2012 15:27:05 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org,
	andi@...stfloor.org, mingo@...e.hu, ming.m.lin@...el.com
Subject: Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge

> +	/*
> +	 * check ucode version for SNB, SNB-EP
> +	 */
> +	if ((model == 42 || model == 45) && uversion < 0x28) {

You need to check for x86 == 6 here.

-Andi
> +		pr_warn("SandyBridge PEBS unavailable due to CPU erratum, "
> +			" update microcode (was 0x%x, needs at least 0x28).\n",
> +			uversion);
> +		return -ENOTSUPP;
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