linux-kernel - Re: [Bug #15124] PCI host bridge windows ignored (works with pci=use

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Message-Id: <201001280909.46043.bjorn.helgaas@hp.com>
Date:	Thu, 28 Jan 2010 09:09:44 -0700
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Jeff Garrett <jeff@...rrett.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Myron Stowe <myron.stowe@...com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [Bug #15124] PCI host bridge windows ignored (works with	pci=use_crs)

On Wednesday 27 January 2010 10:53:51 pm Yinghai Lu wrote:
> On 01/27/2010 08:26 PM, Bjorn Helgaas wrote:
> > On Wed, 2010-01-27 at 15:34 -0800, Yinghai Lu wrote:

> >> 2. how about when apci is disabled?
> > 
> > When ACPI is disabled, I think we just have to accept that we lose some
> > functionality.  I don't see the need for alternate ways to accomplish
> > everything that ACPI does.  It's becoming less and less useful to
> > disable ACPI; I think it's only interesting as a debugging tool, and
> > even then it's a sledgehammer.
> 
> some systems when acpi is enabled could have interrupt storm. 
> and have to disable acpi.

We should fix that problem rather than just covering it up by
disabling ACPI.  Can you provide any details?

I think it's crazy to add code to work around Problem B that only
occurs because we disabled ACPI to work around Problem A.  We should
just fix Problem A instead.

Bjorn
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