[5.16.0] build error on unrecognized opcode: ptesync

[Christophe Leroy]

Le 10/01/2022 à 13:32, Mike a écrit :
> Hey, so I originally sat down to compile the fast headers V2 patch, but 
> quickly discovered other things at play, and grabbed 5.16.0 a few hours 
> after it lifted off,  arch/powerpc/mm/mmu_context.c I had to 
> specifically say had to include -maltivec or it barfed on a 'dssall', 
> I'm fine with that, I've spent years in kernel land, I can deal with 
> that, then came arch/powerpc/lib/step.c with the ptesync. This seems 
> like a totally normal instruction that shouldn't need any extra flags or 
> anything, yet the assembler throws up, and no flag I can think of fixes 
> it. This is a G4 7447. I reverted back to the Debian 5.15. defconfig 
> before dropping this mail as I had tweaked my config to be more G4.
> 

Hi Mike,

Can you provide a bit more details about your setup and config ?

Are you using GCC or LLVM ?
What version of GCC and BINUTILS or what version of LLVM ?

What is DEBIAN defconfig ? Does it correspond to one of the standard 
mainline kernel defconfigs ? If not can you provide it ?

Thanks
Christophe