linux-kernel - Re: kexec boot regression

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Message-ID: <4B2781AC.8020301@kernel.org>
Date:	Tue, 15 Dec 2009 04:31:40 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>, mingo@...e.hu,
	rdreier@...co.com
Subject: Re: kexec boot regression

Jens Axboe wrote:
> On Tue, Dec 15 2009, Yinghai Lu wrote:
>> Jens Axboe wrote:
>>> Hi,
>>>
>>> I have this big box that takes forever to boot, so I use kexec to boot
>>> into new kernels. Works fine, but some time past 2.6.32 it stopped
>>> working. Instead of wasting brain cycles on finding out why, I handed
>>> the problem to my trusty regression friend - git bisect.
>>>
>>> This is what it found (sorry Yinghai it's you again, you owe me a beer
>>> for hours of 2.6.32-git bisecting ;-)
>> sure.
>>
>>>
>>> 99935a7a59eaca0292c1a5880e10bae03f4a5e3d is the first bad commit
>>> commit 99935a7a59eaca0292c1a5880e10bae03f4a5e3d
>>> Author: Yinghai Lu <yinghai@...nel.org>
>>> Date:   Sun Oct 4 21:54:24 2009 -0700
>>>
>>>     x86/PCI: read root resources from IOH on Intel
>>>     
>>>     For intel systems with multi IOH, we should read peer root resources
>>>     directly from PCI config space, and don't trust _CRS.
>>>
>>>
>>> I could not revert this single commit, as a further commit made other
>>> changes. So I reverted 67f241f4 first and then 99935a7a. I confirmed
>>> that this kernel then works fine.
>>>
>> let see how BIOS mess it up again!
> 
> Heh, I had a feeling this was coming :-)
> 
>> please.
> 
> Please find two logs attached - one from a boot with -git and the two
> patches reverted, and one from a boot with -git.

please enabled CONFIG_PCI_DEBUG and boot with debug in boot command line.

Thanks

Yinghai
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