linux-kernel - Re: [PATCH -tip] perf_counter/x86: Fix incorrect default branch

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Date:	Wed, 10 Jun 2009 12:44:09 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yong Wang <yong.y.wang@...ux.intel.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -tip] perf_counter/x86: Fix incorrect default branch


* Yong Wang <yong.y.wang@...ux.intel.com> wrote:

> On Tue, Jun 09, 2009 at 04:25:06PM +0200, Ingo Molnar wrote:
> > 
> > They dont have X86_FEATURE_ARCH_PERFMON set, right?
> > 
> > I made the switch statement under the assumption that it covers all 
> > existing arch-perfmon CPU models. If not, the 'default:' placement 
> > would indeed be buggy.
> > 
> 
> OK, you are right. X86_FEATURE_ARCH_PERFMON eliminates all the old CPUs.
> However, the logic still seems not correct. Both the Core2 CPUs I'm
> using are recognized as Nehalem/Corei7. /proc/cpuinfo and cpuid outputs
> are given below.
> 
> The first one:
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 23
> model name      : Intel(R) Core(TM)2 Duo CPU     P8400  @ 2.26GHz
> stepping        : 6
> 
> CPUID.0x00000001: eax=0x00010676
> 
> The second one:
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 15
> model name      : Intel(R) Core(TM)2 CPU          6600  @ 2.40GHz
> stepping        : 6
> 
> CPUID.0x00000001: eax=0x000006f6
> 
> Looks like it's not enough to just look at boot_cpu_data.x86_model.

Yeah - i've applied the patch you sent, thanks. I'm mostly working 
on NHM so i didnt notice.

	Ingo
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