linux-kernel - Re: [PATCH v2 1/4] s390: only build for new CPUs with clang

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Message-Id: <20190503142545.GC5602@osiris>
Date:   Fri, 3 May 2019 16:25:45 +0200
From:   Heiko Carstens <heiko.carstens@...ibm.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Martin Schwidefsky <schwidefsky@...ibm.com>,
        clang-built-linux@...glegroups.com,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        linux-s390@...r.kernel.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Philipp Rudo <prudo@...ux.vnet.ibm.com>,
        Tony Krowiak <akrowiak@...ux.ibm.com>,
        Ursula Braun <ubraun@...ux.ibm.com>,
        Rob Herring <robh@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] s390: only build for new CPUs with clang

On Mon, Apr 15, 2019 at 10:35:51AM +0200, Arnd Bergmann wrote:
> llvm does does not understand -march=z9-109 and older target
> specifiers, so disable the respective Kconfig settings and
> the logic to make the boot code work on old systems when
> building with clang.
> 
> Part of the early boot code is normally compiled with -march=z900
> for maximum compatibility. This also has to get changed with
> clang to the oldest supported ISA, which is -march=z10 here.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/s390/Kconfig       |  6 ++++++
>  arch/s390/boot/Makefile | 18 ++++++++++++------
>  2 files changed, 18 insertions(+), 6 deletions(-)

Applied, thanks.