linux-kernel - Re: [PATCH] Replace nvidia timer override quirk with pci id list

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Message-ID: <20080208190143.GB11573@one.firstfloor.org>
Date:	Fri, 8 Feb 2008 20:01:43 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Prakash Punnoor <prakash@...noor.de>
Cc:	Andi Kleen <andi@...stfloor.org>, mingo@...e.hu,
	tglx@...utronix.de, lenb@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Replace nvidia timer override quirk with pci id list

On Fri, Feb 08, 2008 at 06:39:17PM +0100, Prakash Punnoor wrote:
> On the day of Friday 08 February 2008 Andi Kleen hast written:
> > On Fri, Feb 08, 2008 at 04:13:35PM +0100, Prakash Punnoor wrote:
> 
> > > Sorry, I meant the opposite. I needed the acpi_skip_timer_override kernel
> > > parameter for nforce2, thus no override. So this chipset is missing here.
> > > At least I remember that my nforce2 needed the skipping,
> >
> > I hope you remember correctly and mean it this time. It would be better
> > if you could double check.
> 
> Yes, confirmed. timer w/o the skipping stays XT-PIC on nforce2.

Confirmed what? Did you test my patch on both machines? 
What was the result? 

> lspci -n:

Please always send lspci without -n too; I hate looking up hex codes
by hand when a computer can do that for me.

> 02:00.0 0300: 10de:0281 (rev a1)
> 
> > I'm a little sceptical because we had this patch in OpenSUSE 10.3
> > and I didn't think there were complaints from NF2 users.
> > With the changes you're requesting it turns from something
> > very well tested into something experimental.
> 
> Well, even w/o the skipping my nforce2 system wasn't unstable, AFAIK. So I 
> don't think just because of the XT-PIC entry people would complain.

Timer override only does something in APIC mode and when you see XT-PIC
in /proc/interrupts then you're not in APIC mode. All these patches
are a no-op in this state.

> See why I don't want the quirk to be applied more than needed? *NOT* applying 
> the quirk on nforce2 didn't cause any obvious side effects. APPLYING to mcp51 
> causes hard lock-ups.

Can you please just test the patches instead of speculating what they
might do or not do?

-Andi
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