linux-kernel - Re: Linux 2.6.27-rc5: System boot regression caused by commit a2bd7274b47124d2fc4dfdb8c0591f545ba749dd

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Message-ID: <86802c440808292202v235e66bcr42f3727a3665a71e@mail.gmail.com>
Date:	Fri, 29 Aug 2008 22:02:33 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Linus Torvalds" <torvalds@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Jeff Garzik" <jeff@...zik.org>, "Tejun Heo" <htejun@...il.com>,
	"Ingo Molnar" <mingo@...e.hu>,
	"David Witbrodt" <dawitbro@...global.net>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Kernel Testers" <kernel-testers@...r.kernel.org>
Subject: Re: Linux 2.6.27-rc5: System boot regression caused by commit a2bd7274b47124d2fc4dfdb8c0591f545ba749dd

On Fri, Aug 29, 2008 at 9:41 PM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
> On Fri, Aug 29, 2008 at 8:24 PM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>>
>>
>> On Fri, 29 Aug 2008, Yinghai Lu wrote:
>>>
>>> we need to use insert_resource_split_to_fit instead...
>>>
>>> otherwise __request_region will not be happy.
>>
>> Are you really really sure?
>>
>> Try just removing the IORESOURCE_BUSY. As mentioned, if we expect the PCI
>> BAR's to work with the e820 resources, then BUSY really is simply not
>> right any more. Not that I think it should matter either..
>>
>> The ones that are added _early_ should be IORESOURCE_BUSY (ie the ones
>> that cover RAM), but the others we now expect to nest with PCI BARs.
>
> not all. some are MMCONF, some are for GART, and some for fixed lapic,
> and fixed ioapic, and fixed HPET.

we may not need put reserve entries from e820 into resource tree.
and only insert those sticky resources (with _BUSY) before
pci_assign_unassign and _request_region etc.

YH
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