linux-kernel - Re: drivers/pci/quirks.c: irq_reroute

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Date:	Tue, 11 Aug 2009 10:06:22 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Stefan Assmann <sassmann@...hat.com>, Len Brown <lenb@...nel.org>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Olaf Dabrunz <Olaf.Dabrunz@....net>
Subject: Re: drivers/pci/quirks.c: irq_reroute_variant is dead code?


* Stefan Assmann <sassmann@...hat.com> wrote:

> On 10.08.2009 18:32, Jesse Barnes wrote:
>> [Corrected Stefan's address.]
>
> Thanks Jesse! CCing Olaf as well.
>
>> On Sat, 8 Aug 2009 16:45:20 +0200
>> Ingo Molnar<mingo@...e.hu>  wrote:
>>
>>> * Jesse Barnes<jbarnes@...tuousgeek.org>  wrote:
>>>
>>>> On Tue, 28 Jul 2009 12:50:08 -0700
>>>> Jeremy Fitzhardinge<jeremy@...p.org>  wrote:
>>>>
>>>>> quirk_reroute_to_boot_interrupts_intel() goes to some effort to
>>>>> scan for a bunch of Intel devices and set
>>>>> dev->irq_reroute_variant = INTEL_IRQ_REROUTE_VARIANT.  However,
>>>>> as far as I can see that's the only reference to
>>>>> dev->irq_reroute_variant and INTEL_IRQ_REROUTE_VARIANT, so the
>>>>> whole thing appears to have no effect.
>>>>>
>>>>> Is it all dead code?  Is there something else which should be
>>>>> there missing?
>>>> Hm my quick look couldn't find a user either.  The initial patch
>>>> to add that stuff (e1d3a90846b40ad3160bf4b648d36c6badad39ac) had
>>>> an ACPI component, but it looks like that may have vanished
>>>> somehow (maybe some of the IOAPIC code got shuffled around and
>>>> this bit was missed?).
>>>>
>>>> Stefan or Ingo?
>>> I dont remember ioapic interactions. Stefan?
>>>
>>> 	Ingo
>>>
>
> Actually the ACPI part of the commit got trashed by some major 
> ACPI rewrite. [...]

Yeah, i remember some larger reject resolved by Len i think, about 
two cycles ago, in this area. So we probably lost those bits there - 
i've Cc:-ed Len.

There's no urgency in terms of v2.6.31 (since we never really 
exposed this new functionality in a new release), but it would be 
nice to get to the bottom of this.

	Ingo
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