From mboxrd@z Thu Jan  1 00:00:00 1970
From: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
Subject: Re: 2.6.27-rc4-git1: Reported regressions from 2.6.26
Date: Sun, 24 Aug 2008 17:16:57 -0700
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To: Linus Torvalds <torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
Cc: "Rafael J. Wysocki" <rjw-KKrjLPT3xs0@public.gmane.org>, Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>, Alok Kataria <akataria-pghWNbHTmq7QT0dZR+AlfA@public.gmane.org>, Sean Young <sean-hENCXIMQXOg@public.gmane.org>, Linux Kernel Mailing List <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Adrian Bunk <bunk-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, Natalie Protasevich <protasnb-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Kernel Testers List <kernel-testers-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>

Linus Torvalds wrote:
>> 
> diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
> index 46af716..9bed5ca 100644
> --- a/arch/x86/kernel/tsc.c
> +++ b/arch/x86/kernel/tsc.c
> @@ -325,6 +325,10 @@ static struct notifier_block time_cpufreq_notifier_block = {
>  
>  static int __init cpufreq_tsc(void)
>  {
> +	if (!cpu_has_tsc)
> +		return 0;
> +	if (boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
> +		return 0;
>  	cpufreq_register_notifier(&time_cpufreq_notifier_block,
>  				CPUFREQ_TRANSITION_NOTIFIER);
>  	return 0;

I added this patch to x86/urgent.

	-hpa