linux-kernel - Re: [BUG] x86: reboot doesn't reboot

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Date:	Fri, 04 Apr 2014 10:43:07 +0800
From:	"Li, Aubrey" <aubrey.li@...ux.intel.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: [BUG] x86: reboot doesn't reboot

On 2014/4/4 10:16, Steven Rostedt wrote:
> On Fri, 04 Apr 2014 07:52:53 +0800
> "Li, Aubrey" <aubrey.li@...ux.intel.com> wrote:
> 
>> On 2014/4/4 7:40, Steven Rostedt wrote:
>>> On Fri, 04 Apr 2014 07:23:32 +0800
>>> "Li, Aubrey" <aubrey.li@...ux.intel.com> wrote:
>>>
>>>> Can you please send the dmi table out?
>>>
>>> I already did as a gz attachment to H. Peter. You were on the Cc, did
>>> you not receive it?
>>>
>> Oh, I got it. This is a Preproduction machine.
>> When reboot failed via a method (=e or =p), there are two case.
>>
>> Case 1: this method do nothing, pass the attempt chance to the next method
>> Case 2: this method hangs the system
>>
>> I want to know if CF9 is case 1 or case 2. Could you please try the following
>> patch *without* any reboot parameters?
>>
>> (1) If we didn't see any string, then EFI hangs your box.
>> (2) if we see the first string but not the second one, CF9 hangs your box
>> (3) if we see both, couldn't be, because BIOS works on your box.
> 
> Here's the output:
> 
> [  114.445327] reboot: Restarting system
> [  114.449002] reboot: machine restart
> [  114.453495] reboot: reboot via CF9...
> 

Thanks Steven, I got what I want.

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