linux-kernel - Re: [PATCH 01/12] s390: remove -fno-strength-reduce flag

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Message-Id: <20190410175725.23b7f051@mschwideX1>
Date:   Wed, 10 Apr 2019 17:57:25 +0200
From:   Martin Schwidefsky <schwidefsky@...ibm.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Heiko Carstens <heiko.carstens@...ibm.com>,
        clang-built-linux@...glegroups.com,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        linux-s390@...r.kernel.org, Vasily Gorbik <gor@...ux.ibm.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/12] s390: remove -fno-strength-reduce flag

On Mon,  8 Apr 2019 23:26:14 +0200
Arnd Bergmann <arnd@...db.de> wrote:

> This was added as a workaround for really old compilers, and it prevents
> building with clang now. I can see no reason for keeping it, as it has
> already been removed for most architectures in the pre-git era, so
> let's remove it everywhere, rather than only for clang.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/s390/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/s390/Makefile b/arch/s390/Makefile
> index 86c76b149cc2..0087d11e3eaf 100644
> --- a/arch/s390/Makefile
> +++ b/arch/s390/Makefile
> @@ -114,7 +114,7 @@ endif
>  cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
> 
>  KBUILD_CFLAGS	+= -mbackchain -msoft-float $(cflags-y)
> -KBUILD_CFLAGS	+= -pipe -fno-strength-reduce -Wno-sign-compare
> +KBUILD_CFLAGS	+= -pipe -Wno-sign-compare
>  KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables $(cfi)
>  KBUILD_AFLAGS	+= $(aflags-y) $(cfi)
>  export KBUILD_AFLAGS_DECOMPRESSOR

Added to s390/linux:features for the next merge window. Thanks.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.