linux-kernel - Re: 2.6.27-rc4-git1: Reported regressions from 2.6.26

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Message-ID: <48B1F9F9.6090407@zytor.com>
Date:	Sun, 24 Aug 2008 17:16:57 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>,
	Alok Kataria <akataria@...are.com>, Sean Young <sean@...s.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: 2.6.27-rc4-git1: Reported regressions from 2.6.26

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
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