linux-kernel - Re: [PATCH 3/3] x86,pci,acpi: Handle invalid

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Message-ID: <4BCF7D38.8070206@zytor.com>
Date:	Wed, 21 Apr 2010 15:33:28 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	Yinghai Lu <yinghai.lu@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andy Isaacson <adi@...apodia.org>, guenter.roeck@...csson.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Renninger <trenn@...e.de>
Subject: Re: [PATCH 3/3] x86,pci,acpi: Handle invalid _CRS

On 04/21/2010 09:59 AM, Bjorn Helgaas wrote:
> On Wednesday 21 April 2010 10:45:46 am Yinghai Lu wrote:
>> On 04/21/2010 08:21 AM, Bjorn Helgaas wrote:
> 
>>> Why are you doing this patch?  Did you see a machine where the host
>>> bridge was left with no resources because of _CRS issues?  If so,
>>> this patch feels like a band-aid.  I'd rather investigate the issue
>>> directly, because that would probably be a Linux problem we could fix.
>>>
>>> Also, if there *is* a reported problem, you should include a link to
>>> the bugzilla or email thread.
>>>   
>> No, just code review.
> 
> In that case, I don't think this patch is a good idea.  Assume we have
> a Linux problem with _CRS parsing, and as a result, we don't find any
> host bridge resources.  This patch will cause us to silently revert to
> the default resources, so we lose the opportunity to debug and fix the
> Linux problem.
> 
> Even worse, if there's a *BIOS* problem with _CRS, this patch will hide
> it and make it harder to diagnose.
> 
> Bjorn

Hi Bjorn,

Do you have opinions on patches 1-2 of the series?

I'm getting concerned about how the size of the patchset has grown, and
we're past -rc5 already... but it is a regression so we can't just defer
it to .35.

	-hpa
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