linux-kernel - Re: [PATCH] pci: increase alignment to make more space for hidden code

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Message-Id: <200910130915.04697.bjorn.helgaas@hp.com>
Date:	Tue, 13 Oct 2009 09:15:03 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Yinghai Lu <yinghai@...nel.org>, Len Brown <lenb@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jesse Barnes <jesse.barnes@...el.com>,
	Ricardo Jorge da Fonseca Marques Ferreira 
	<storm@...49152.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org,
	Yannick Roehlly <yannick.roehlly@...e.fr>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>, x86@...nel.org,
	andreaorru91@...il.com, jjorge@...e.fr
Subject: Re: [PATCH] pci: increase alignment to make more space for hidden code

On Tuesday 13 October 2009 12:49:01 am Ingo Molnar wrote:
> * Bjorn Helgaas <bjorn.helgaas@...com> wrote:

> > In the patch below, I added some extra PCI dumps of the bridge and the 
> > NIC around the ACPI EC init.  The patch also removes Yinghai's 
> > workaround so we should see the original failure, just with a little 
> > more debug.
> 
> Btw., i'd _strongly_ suggest to finally add some sort of pci=verbose 
> easy-to-use debug toggle for users to enable.
> 
> Everything that matters to resource allocation. We should print the BIOS 
> state (Yinghai did a patch for this some time ago and that is upstream 
> already), we should print quirk execution, we should print ACPI AML 
> execution - everything that might matter to PCI allocations.
> 
> An easy-to-use 'give me all the debug info' feature is really important. 
> We have apic=verbose for similar reasons.

Agreed.  That's why I sent such a huge testing patch -- I think we do
a poor job of making this stuff debuggable, so I want to use this problem
as a test case of "what useful stuff can we print to make this easier in
the future."

Bjorn
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