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

[Larry Finger <Larry.Finger@lwfinger.net>]

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.

Larry