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From:   Nick Desaulniers <ndesaulniers@google.com>
Date:   Tue, 30 Apr 2019 11:22:35 -0700
Message-ID: <CAKwvOdkg=Xo_C_hQrnHt-t-RfcDrBYsrBZUwsKjfXSPhkynOHQ@mail.gmail.com>
Subject: Re: [PATCH 11/10] arm64: unbreak DYNAMIC_DEBUG=y build with clang
To:     Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc:     Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Will Deacon <will.deacon@arm.com>,
        Jason Baron <jbaron@akamai.com>,
        Nathan Chancellor <natechancellor@gmail.com>,
        Arnd Bergmann <arnd@arndb.de>,
        LKML <linux-kernel@vger.kernel.org>, Dan Rue <dan.rue@linaro.org>
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On Mon, Apr 29, 2019 at 10:32 AM Nick Desaulniers
<ndesaulniers@google.com> wrote:
>
> On Fri, Apr 26, 2019 at 12:06 PM Rasmus Villemoes
> <linux@rasmusvillemoes.dk> wrote:
> >
> > Current versions of clang does not like the %c modifier in inline
> > assembly for targets other than x86, so any DYNAMIC_DEBUG=y build
> > fails on arm64. A fix is likely to land in 9.0 (see
> > https://github.com/ClangBuiltLinux/linux/issues/456), but unbreak the
> > build for older versions.
> >
> > Fixes: arm64: select DYNAMIC_DEBUG_RELATIVE_POINTERS
> > Reported-by: Nathan Chancellor <natechancellor@gmail.com>
> > Reported-by: Arnd Bergmann <arnd@arndb.de>
> > Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
> > ---
> > Andrew, please apply and/or fold into 9/10.
> >
> >  arch/arm64/Kconfig | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> > index d0871d523d5d..315992e33b17 100644
> > --- a/arch/arm64/Kconfig
> > +++ b/arch/arm64/Kconfig
> > @@ -83,7 +83,7 @@ config ARM64
> >         select CRC32
> >         select DCACHE_WORD_ACCESS
> >         select DMA_DIRECT_REMAP
> > -       select DYNAMIC_DEBUG_RELATIVE_POINTERS
> > +       select DYNAMIC_DEBUG_RELATIVE_POINTERS if CC_IS_GCC || CLANG_VERSION >= 90000
>
> I just landed the fix for this in Clang, I think around the time you
> sent the patch.  Should ship in Clang 9.  Thanks for unbreaking our
> build.
> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>

+ Dan
who's looking for this to get picked up to unbreak KernelCI arm64+clang builds
https://staging.kernelci.org/build/id/5cc6e080cf3a0f9d66257f6d/
-- 
Thanks,
~Nick Desaulniers