linux-kernel - Re: [discuss] [PATCH] x86_64: fix cpu MHz reporting on constant

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Date:	Thu, 15 Mar 2007 00:01:09 +0100
From:	Andi Kleen <ak@...e.de>
To:	discuss@...-64.org
Cc:	"Joerg Roedel" <joerg.roedel@....com>, linux-kernel@...r.kernel.org
Subject: Re: [discuss] [PATCH] x86_64: fix cpu MHz reporting on constant_tsc cpus

On Tuesday 13 March 2007 11:00, Joerg Roedel wrote:
> From: Mark Langsdorf <mark.langsdorf@....com>
> From: Joerg Roedel <joerg.roedel@....com>
> 
> This patch fixes the reporting of cpu_mhz in /proc/cpuinfo on CPUs with
> a constant TSC rate and a kernel with disabled cpufreq.
> 
> Signed-off-by: Mark Langsdorf <mark.langsdorf@....com>
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> 

+       cpu_khz = tsc_khz;
+       if (cpu_has(&boot_cpu_data, X86_FEATURE_CONSTANT_TSC) &&
+                       nmi_known_cpu()) {
+               cpu_khz = tsc_calibrate_cpu_khz(); 
+       }
 

I don't think this will do the right thing on Intel CPUs of which tsc_calibrate_cpu_khz()
knows nothing about. 

-Andi
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