[PATCH] modpost: amend ppc symnames for -Os build

[René Rebe]

Hey Christophe,

thank you for your quick review!

On Tue, 18 Nov 2025 15:25:14 +0100, Christophe Leroy <christophe.leroy at csgroup.eu> wrote:

> Le 18/11/2025 à 13:17, René Rebe a écrit :
> > [Vous ne recevez pas souvent de courriers de
> > rene at exactco.de. Découvrez pourquoi ceci est important à
> > https://aka.ms/LearnAboutSenderIdentification ]
> > Building a size optimized ppc kernel, gcc emmits more symbols than
> > currently allowed listed in scripts/mod/modpost.c. Add to fix:
> 
> You should say when the problem started to happen, and what those

I guess always, or at least for a long time with -Os functions have a
certain pattern or size. Maybe the size of amdgpu and certainly the
DC_FP use triggered the floating point ones for me.

> functions are supposed to save and restore.
> 
> As an exemple see commit 8fe9c93e7453 ("powerpc: Add vr save/restore
> functions")
> 
> Also confirm it is only needed on powerpc64, if so make it clear in
> the commit message.

The fp ones can only occur for ppc64 right now as long as:
ARCH_HAS_KERNEL_FPU_SUPPORT      if PPC64 && PPC_FPU

If the gpr ones are emitted by gcc for ppc(32) I would need to
specifically review. As it is mostly the more modern ppc64, I'll use
that for v2 then, ...

	     René

-- 
René Rebe, ExactCODE GmbH, Berlin, Germany
https://exactco.de • https://t2linux.com • https://patreon.com/renerebe