linux-kernel - Re: kexec boot regression

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Message-ID: <4B278734.2040704@kernel.org>
Date:	Tue, 15 Dec 2009 04:55:16 -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:
>>> 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.
> 
> On the good or bad kernel?

both please.

YH
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