linux-kernel - Re: [PATCH 1/1] i386: Geode's TSC is not neccessary to mark tu unstable

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Message-ID: <20070715235900.24658.qmail@smb518.nifty.com>
Date:	Mon, 16 Jul 2007 08:59:00 +0900
From:	TAKADA Yoshihito <takada@....nifty.com>
To:	Juergen Beisert <juergen127@...uzholzen.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] i386: Geode's TSC is not neccessary to mark tu unstable

Hi.
Thanks. you are right. TSC is still unstable.

On Sun, 15 Jul 2007 21:06:27 +0200
Juergen Beisert <juergen127@...uzholzen.de> wrote:

> Hi,
> 
> On Sunday 15 July 2007 14:00, TAKADA Yoshihito wrote:
> > Hi. I reported to remove pit_latch_buggy(http://lkml.org/lkml/2007/2/10/8).
> > In the report, I stated that TSC was unstable.
> > When I installed 2.6.21, GeodeGX's TSC is stable.
> 
> GeodeGX1's TSC is stable until you activate halt/suspend feature. In 
> arch/i386/kernel/cpu/cyrix.c:geode_configure() it will be activated by 
> default. But due to a macro failure the line
>   setCx86(CX86_CCR2, getCx86(CX86_CCR2) | 0x88);
> does nothing.
> Replace the setCx86/getCx86 macros by the attached patch, and the TSC will be 
> unstable again!
> 
> So it makes sense to mark the TSC unstable if the halt/suspend feature is 
> activated.
> 
> Juergen

-- 
TAKADA <takada@....nifty.com>

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