linux-kernel - Re: [PATCH] Fix fallout from PCI: PCIE ASPM support

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Date:	Sat, 2 Feb 2008 09:39:08 -0600
From:	Olof Johansson <olof@...om.net>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	torvalds@...ux-foundation.org, git-commits-head@...r.kernel.org,
	gregkh@...e.de
Subject: Re: [PATCH] Fix fallout from PCI: PCIE ASPM support

On Fri, Feb 01, 2008 at 09:59:21PM -0800, H. Peter Anvin wrote:
> Olof Johansson wrote:
>> On Sat, Feb 02, 2008 at 05:06:42AM +0000, Linux Kernel Mailing List wrote:
>>
>>>     PCI: PCIE ASPM support
>>
>> This one broke almost all defconfigs on powerpc, since they enable
>> CONFIG_EXPERIMENTAL and CONFIG_PCI, and this option defaults to y.
>>
>> Make it default to 'n' like most other options, and make it depend on
>> ACPI. Take out the unneccessary default 'n' from the debug option as well.
>>
>
> Is this actually ACPI-dependent?

It shouldn't be, but it seems like it's currently entangled a bit with
the acpi include files. OSC_ACTIVE_STATE_PWR_SUPPORT comes from
linux/pci-acpi.h.

I can't include acpi/acpi_bus.h though, since that ends up pulling in
asm/ files that don't exist on powerpc.

So if the probing is fixed, no, it's not ACPI-dependent. Seems like
something that's just as well to mask behind it until someone's actually
used and tested it on a non-ACPI platform though, no?

I would experiment with it but I believe our firmware turns off empty
links before the kernel is booted, we don't support hotplug at this time.

-Olof

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