[PATCH V2] modpost: Amend ppc64 save/restfpr symnames for -Os build

[Erhard Furtner]

On 11/23/25 15:57, Christophe Leroy (CS GROUP) wrote:
> 
> 
> Le 23/11/2025 à 13:13, René Rebe a écrit :
>> Building a size optimized ppc64 kernel (-Os), gcc emits more FP
>> save/restore symbols, that the linker generates on demand into the
>> .sfpr section. Explicitly allow-list those in scripts/mod/modpost.c,
>> too. They are needed for the amdgpu in-kernel floating point support.
> 
> Would have been interested to know with which version of GCC the problem 
> started.

I can reproduce the modpost errors on GCC 15.2 and GCC 11.5.

Same kernel .config builds ok with CLANG 20.1.8 however.

> By the way you seem to fix the problem for modules, but does it also 
> work when amdgpu is in kernel ? I would have expected a need to add 
> functions in arch/powerpc/lib/crtsavres.S as well, just like following 
> commits:

If I build amdgpu statically into the kernel I don't get the modpost 
errors, the build finishes successfully. Only building amdgpu as module 
leads to these errors Rene reported.

Regards,
Erhard