linux-kernel - Re: [PATCH 4/4] x86_64 ioapic: Improve the heuristics for when check

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Message-ID: <m1bql9gl9y.fsf@ebiederm.dsl.xmission.com>
Date:	Mon, 08 Jan 2007 16:18:33 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Adrian Bunk <bunk@...sta.de>
Cc:	Linus Torvalds <torvalds@...l.org>,
	Tobias Diedrich <ranma+kernel@...edrich.de>,
	Yinghai Lu <yinghai.lu@....com>, Andrew Morton <akpm@...l.org>,
	Andi Kleen <ak@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	mingo@...hat.com, discuss@...-64.org
Subject: Re: [PATCH 4/4] x86_64 ioapic: Improve the heuristics for when check_timer fails.

Adrian Bunk <bunk@...sta.de> writes:

> On Mon, Jan 08, 2007 at 02:45:00PM -0700, Eric W. Biederman wrote:
>> Adrian Bunk <bunk@...sta.de> writes:
>
> We just got a completely different bug reported that was confirmed to be 
> caused by Andi's patch:
>    AMD64/ATI : timer is running twice as fast as it should [1]

Odd. I didn't think Andi's code worked well enough that we could hit
anything but the default trust the BIOS case.  I guess someone had
the right hardware to perform that miracle.

>> I really don't care how we do it, or in what timeframe.  But what I have
>> posted is the only way I can see of making it better, than what we had
>> in 2.6.19.
>>...
>
> My whole point is that for 2.6.20, we can live with simply reverting 
> Andi's commit.
>
> What to do for 2.6.21 is a completely different story.

That is where I figured we were when we first hit this bug.

I have always found the ways of stable tree maintainers to be
mysterious.  Sometimes holding back code with minimal risk sometimes
insisting we cleanup things instead of reverting things.

So I have just decided to write the code and let other people figure
out when it should be merged :)  And of course when my code has
problems to address them.

Eric
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