linux-kernel - Re: [3.9-rc1] irq 16: nobody cared (was [3.9-rc1] very poor interrupt responses)

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Date:	Fri, 15 Mar 2013 08:59:06 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Peter Hurley <peter@...leysoftware.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Thomas Meyer <thomas@...3r.de>,
	Shawn Starr <shawn.starr@...ers.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>,
	linux-acpi@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-pci@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: Re: [3.9-rc1] irq 16: nobody cared  (was [3.9-rc1] very poor interrupt
 responses)

On Thu, 14 Mar 2013, Rafael J. Wysocki wrote:

> > > commit 181380b702eee1a9aca51354d7b87c7b08541fcf
> > > Author: Yinghai Lu <yinghai@...nel.org>
> > > Date:   Sat Feb 16 11:58:34 2013 -0700
> > > 
> > >     PCI/ACPI: Don't cache _PRT, and don't associate them with bus numbers
> > 
> > This patch __fixed__ this problem for me in linux-next back in February.
> > 
> > Rafael, did you hold back some ACPI patches from 3.9 that would have
> > made fix no longer applicable?
> 
> No, I didn't.
> 
> I'm afraid, though, that the fix might not be effective on some systems for a
> reason that's unclear at the moment.
> 
> So in fact the one to check is commit 4f535093cf ("PCI: Put pci_dev in device
> tree as early as possible") and if the problem doesn't appear before that, we
> need to figure out why the fix may not be sufficient.

With either 4f535093cf or 181380b702 I do *not* see the problem, i.e. 
these commits are not the culprit and it was caused by some later change.

I will proceed with bisect now, hopefully it'll produce a meaningful 
result.

-- 
Jiri Kosina
SUSE Labs
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