linux-kernel - Re: [v2] raid6/ppc: Fix build for clang

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Date:   Sat, 22 Dec 2018 20:55:01 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Joel Stanley <joel@....id.au>, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Cc:     Jinsong Ji <jji@...ibm.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [v2] raid6/ppc: Fix build for clang

On Fri, 2018-11-02 at 00:44:55 UTC, Joel Stanley wrote:
> We cannot build these files with clang as it does not allow altivec
> instructions in assembly when -msoft-float is passed.
> 
> Jinsong Ji <jji@...ibm.com> wrote:
> > We currently disable Altivec/VSX support when enabling soft-float.  So
> > any usage of vector builtins will break.
> >
> > Enable Altivec/VSX with soft-float may need quite some clean up work, so
> > I guess this is currently a limitation.
> >
> > Removing -msoft-float will make it work (and we are lucky that no
> > floating point instructions will be generated as well).
> 
> This is a workaround until the issue is resolved in clang.
> 
> Link: https://bugs.llvm.org/show_bug.cgi?id=31177
> Link: https://github.com/ClangBuiltLinux/linux/issues/239
> Signed-off-by: Joel Stanley <joel@....id.au>
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/e213574a449f7a57d4202c1869bbc7

cheers