Issues with the first PowerPC updates for the kernel 6.1

[Christian Zigotzky]

> On 17. Oct 2022, at 02:43, Michael Ellerman <mpe at ellerman.id.au> wrote:
> Previously BIG_ENDIAN && GENERIC_CPU would use -mcpu=power5, now it uses
> -mcpu=power4.

Maybe this is the issue. We will wait and not release the RC1 for testing because it is a risk for our testers to test these new kernels because of this issue.

It is really important do not to rewrite code, that is well worked before.
Bugfixing and adding some new features is ok but rewriting of good code is expensive and doesn’t make any sense.

— Christian

> 
> 
> cheers
> 
>>>> On 16. Oct 2022, at 18:51, Segher Boessenkool <segher at kernel.crashing.org> wrote:
>>> 
>>> On Fri, Oct 14, 2022 at 06:11:21PM +0200, Christian Zigotzky wrote:
>>>> make oldconfig has asked because of the CPU family. I choosed GENERIC for my P.A. Semi PWRficient PA6T-1682M. Is this correct? Maybe this is the problem.
>>>> 
>>>> config GENERIC_CPU
>>>> -    bool "Generic (POWER4 and above)"
>>>> +    bool "Generic (POWER5 and PowerPC 970 and above)"
>>>>   depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
>>>>   select PPC_64S_HASH_MMU
>>>> 
>>>> There isn’t a POWER4 anymore and I used it via CONFIG_GENERIC_CPU=y before.
>>> 
>>> PA6T is ISA 2.04, just like POWER5+.  It should be fine.
>>> 
>>> 
>>> Segher