On 13 May 2021 at 5:51pm, Christophe Leroy wrote:

Le 13/05/2021 à 17:19, Christian Zigotzky a écrit :

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On 13 May 2021 at 12:01 pm, Christophe Leroy wrote:

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Le 13/05/2021 à 08:47, Christian Zigotzky a écrit :

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Hi Christophe,

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On 9. May 2021, at 19:37, Christophe Leroy 
[off-list ref] 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.

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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

----

Thanks,
Christian