Re: linux-next: Tree for Jul 31 - s390 crypto build breakage

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

On Fri, 2 Aug 2019 at 09:46, Heiko Carstens <heiko.carstens@de.ibm.com> wrote:
>
> On Thu, Aug 01, 2019 at 08:28:56PM +0300, Ard Biesheuvel wrote:
> > On Thu, 1 Aug 2019 at 15:28, Heiko Carstens <heiko.carstens@de.ibm.com> wrote:
> > > Still not... with linux-next as of today I get this (s390 defconfig):
> > >
> > > ERROR: "crypto_aegis128_decrypt_chunk_simd" [crypto/aegis128.ko] undefined!
> > > ERROR: "crypto_aegis128_update_simd" [crypto/aegis128.ko] undefined!
> > > ERROR: "crypto_aegis128_encrypt_chunk_simd" [crypto/aegis128.ko] undefined!
> > > scripts/Makefile.modpost:105: recipe for target 'modules-modpost' failed
> > >
> >
> > Hello Heiko,
> >
> > Apologies for the breakage. The first two fixes addressed obvious
> > shortcomings in my code, but with this issue, I'm a bit puzzled tbh.
> > The calls to these missing functions should be optimized away, since
> > have_simd never gets assigned if CONFIG_CRYPTO_AEGIS128_SIMD is not
> > defined, but for some reason, this isn't working. Which version of GCC
> > are you using?
>
> Plain vanilla gcc 9.1.0.
>
> > Also, could you please try whether the patch below fixes the problem? Thanks
> > https://lore.kernel.org/linux-crypto/20190729074434.21064-1-ard.biesheuvel@linaro.org/
>
> Yes, with that patch applied the code compiles.
>

Thanks for confirming.

Since Voldis is reporting GCC 9.1.x as well, this might be a compiler
regression (and it explains why I did not see the issue locally)

In any case, the patches have been reverted now, so I will resubmit
them with the above change folded in.

Thanks,
Ard.