linux-kernel - Re: 3.2-rc2 freezes on boot for AMD K6 - bisected to commit bcb80e53877c2045d9e52f4a71372c3fe6501f6f

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Date:	Sat, 03 Dec 2011 14:43:30 -0600
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Borislav Petkov <borislav.petkov@....com>
CC:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 3.2-rc2 freezes on boot for AMD K6 - bisected to commit bcb80e53877c2045d9e52f4a71372c3fe6501f6f

On 11/30/2011 01:09 AM, Larry Finger wrote:
> On 11/29/2011 11:59 PM, Srivatsa S. Bhat wrote:
>> On 11/30/2011 10:24 AM, Larry Finger wrote:
>>
>>> I have an ancient laptop with an AMD-K6 CPU that freezes on boot with
>>> 3.2-rc2. The problem was bisected to commit bcb80e53877c2.
>>>
>>> The cpuinfo for this box is:
>>>
>>>>> cpu.1: cpuinfo
>>> ----- /proc/cpuinfo -----
>>> processor : 0
>>> vendor_id : AuthenticAMD
>>> cpu family : 5
>>> model : 8
>>> model name : AMD-K6(tm) 3D processor
>>> stepping : 12
>>> cpu MHz : 428.804
>>> cache size : 64 KB
>>> fdiv_bug : no
>>> hlt_bug : no
>>> f00f_bug : no
>>> coma_bug : no
>>> fpu : yes
>>> fpu_exception : yes
>>> cpuid level : 1
>>> wp : yes
>>> flags : fpu vme de pse tsc msr cx8 pge mmx syscall 3dnow
>>> k6_mtrr up
>>> bogomips : 857.60
>>> clflush size : 32
>>> cache_alignment : 32
>>> address sizes : 32 bits physical, 32 bits virtual
>>> power management:
>>>
>>> ----- /proc/cpuinfo end -----
>>>
>>> This patch is quite simple, thus it appears that rdmsr() is OK, but that
>>> rdmsr_safe() is not.
>>>
>>> I am happy to provide any other info regarding this box.
>>>
>>
>>
>> Hi Larry,
>>
>> Can you please try out the patch posted in
>> https://lkml.org/lkml/2011/11/28/178 ?
>>
>> This patch will be available in mainline kernel from -rc4.
>> https://lkml.org/lkml/2011/11/28/457
>
> Srivatsa,
>
> Thanks for the reference. That patch does fix my problem. Too bad that the bad
> commit was not in the subject of that other thread so that I could have found it
> with Google.

Borislav,

I just updated mainline to 3.2-rc4, and that patch is not included. Please check 
with Ingo to see why it was not available. It is a real show stopper for old AMD 
CPUs.

Thanks,

Larry

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