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SubjectRe: [PATCH v2 25/43] powerpc/32: Replace ASM exception exit by C exception exit from ppc64
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Christophe Leroy <christophe.leroy@csgroup.eu> writes:
> Le 11/03/2021 à 14:46, Michael Ellerman a écrit :
>> Christophe Leroy <christophe.leroy@csgroup.eu> writes:
>>> This patch replaces the PPC32 ASM exception exit by C exception exit.
>>>
>>> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
>>> ---
>>> arch/powerpc/kernel/entry_32.S | 481 +++++++++-----------------------
>>> arch/powerpc/kernel/interrupt.c | 4 +
>>> 2 files changed, 132 insertions(+), 353 deletions(-)
>>
>> Bisect points to this breaking qemu mac99 for me, with pmac32_defconfig.
>>
>> I haven't had time to dig any deeper sorry.
>
> Embarrasing ...

Nah, these things happen.

> I don't get this problem on the 8xx (nohash/32) or the 83xx (book3s/32).
> I don't get this problem with qemu mac99 when using my klibc-based initramfs.
>
> I managed to reproduce it with the rootfs.cpio that I got some time ago from linuxppc github Wiki.

OK.

I'm using the ppc-rootfs.cpio.gz from here:

https://github.com/linuxppc/ci-scripts/blob/master/root-disks/Makefile

And the boot script is:

https://github.com/linuxppc/ci-scripts/blob/master/scripts/boot/qemu-mac99

I've been meaning to write docs on how to use those scripts, but haven't
got around to it.

There's nothing really special though it's just a wrapper around qemu -M mac99.

> I'll investigate it tomorrow.

Thanks.

cheers

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