[FSL P50x0] Xorg always restarts again and again after the the PowerPC updates 5.13-1

[Christophe Leroy]

Le 13/05/2021 à 18:35, Christian Zigotzky a écrit :
> On 13 May 2021 at 5:51pm, Christophe Leroy wrote:
>>
>>
>> Le 13/05/2021 à 17:19, Christian Zigotzky a écrit :
>>> On 13 May 2021 at 12:01 pm, Christophe Leroy wrote:
>>>>
>>>>
>>>> Le 13/05/2021 à 08:47, Christian Zigotzky a écrit :
>>>>> Hi Christophe,
>>>>>
>>>>>> On 9. May 2021, at 19:37, Christophe Leroy <christophe.leroy at csgroup.eu> wrote:
>>>>>>
>>>>>> Did I do an error in my analysis ?
>>>>>
>>>>> No, you didn’t. On the contrary you have found the issue. ;-) The issue is somewhere in the new 
>>>>> interrupt code.
>>>>
>>>> I'm not convinced, but let's give it a try.
>>>>
>>>>>
>>>>>> ZZ | * | ceff77efa4f8 powerpc/64e/interrupt: Use new interrupt context tracking scheme
>>>>>
>>>>> Could you please create a patch for reverting the new interrupt code? I would like to confirm 
>>>>> your result.
>>>>
>>>> Please fetch https://github.com/chleroy/linux.git and try the branch for_christian.
>>>>
>>>> This is a revert of approx a dozen of commits around the changes to 64e on top of v5.13-rc1.
>>>>
>>>> If the top of the branch works for you, it would be great if you can find out which one of the 
>>>> reverts fixes the problem for real.
>>>>
>>>> Thanks
>>>> Christophe
>>> It's working! Great! I can use the RC1 on my FSL P5040. Thank you! The issue is definitely 
>>> somewhere in the interrupt code. Please tell me the next steps.
>>>
>>
>> Can you bisect between 5.13-rc1 and the top of the 'for_christian' branch to find the first 'good' 
>> commit ?
>>
>> Take care it is an "up side down" bisect, a 'good' is one that does _not_ work and a 'bad' is a 
>> commit that works.
>>
>> git bisect start
>> git bisect bad 1c8f441f1485
>> git bisect good 6efb943b8616
>>
>> Christophe
> Hi Christophe,
> 
> Yes, I can. Shall I use the branch 'for_christian' or the default linux git for bisecting? I have 
> tried it already with the branch 'for_christian' but it doesn't compile.
> 
> git bisect start
> git bisect bad 1c8f441f1485
> git bisect good 6efb943b8616
> 
> Output: [d66b1d1aab0c1caad11eca417f515b86ec0bebe9] Revert "powerpc/64e/interrupt: Use new interrupt 
> context tracking scheme"
> 
> Result:
> 
> arch/powerpc/kernel/interrupt.o: In function `.syscall_exit_prepare':
> interrupt.c:(.text+0x278): undefined reference to `.schedule_user'
> arch/powerpc/kernel/interrupt.o: In function `.interrupt_exit_user_prepare':
> interrupt.c:(.text+0x340): undefined reference to `.schedule_user'
> Makefile:1191: recipe for target 'vmlinux' failed
> make: *** [vmlinux] Error 1
> 

Ah yes, I remember this problem.

Can you select CONFIG_VIRT_CPU_ACCOUNTING_GEN in your configuration ?

Otherwise, I can try to fix the branch.

Christophe