linux-kernel - Re: [RFC PATCH 1/1] PCI: skip release and reallocation of io port resources

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Message-ID: <20100702143515.2896d728@virtuousgeek.org>
Date:	Fri, 2 Jul 2010 14:35:15 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Ram Pai <linuxram@...ibm.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	clemens@...isch.de, Yinghai Lu <yinghai@...nel.org>
Subject: Re: [RFC PATCH 1/1] PCI: skip release and reallocation of io port
 resources

On Wed, 30 Jun 2010 16:59:49 -0700
Ram Pai <linuxram@...ibm.com> wrote:

> On Wed, Jun 30, 2010 at 04:10:26PM -0700, Linus Torvalds wrote:
> > On Wed, Jun 30, 2010 at 2:15 PM, Ram Pai <linuxram@...ibm.com> wrote:
> > >       PCI: skip release and reallocation of io port resources
> > 
> > Gaah. This still looks like just total ad-hoc hackery. The logic for
> > it all seems very fragile, just a random case made up from the one
> > failing issue. There's no underlying logic or design to it.
> > 
> > I still think that we should just make people explicitly ask for a
> > blank slate if the bios allocations don't work out. 
> 
> and interactively allocate resource?

No I don't think we want to add any prompts to the kernel boot
process. :)

> > Rather than trying
> > to fix it up automatically, which has been a total rats nest of random
> > crud.
> 
> Can Yinghai Lu's patch 'pci=try=' be some temporary middle ground till
> a more elaborate patch is found?
> 
> His suggestion partly meets your suggestion. It does not automatically 
> reassign unless the user explicitly asks for it. Hence should not
> break any working systems, at the same time can handle system like 
> mine.

pci=try just doesn't communicate much, it should be something like
pci=override_bios and do as Linus suggests.

But we should continue to shoot for not ever having to use that option
on normal systems.

-- 
Jesse Barnes, Intel Open Source Technology Center
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