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References: <YMtib5hKVyNknZt3@osiris> <20210617193139.856957-1-nathan@kernel.org>
 <YMxcdv/1taBevSjP@osiris>
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From:   Masahiro Yamada <masahiroy@kernel.org>
Date:   Sat, 19 Jun 2021 09:40:55 +0900
Message-ID: <CAK7LNARuSmPCEy-ak0erPrPTgZdGVypBROFhtw+=3spoGoYsyw@mail.gmail.com>
Subject: Re: [PATCH] scripts/min-tool-version.sh: Raise minimum clang version
 to 13.0.0 for s390
To:     Heiko Carstens <hca@linux.ibm.com>
Cc:     Nathan Chancellor <nathan@kernel.org>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        clang-built-linux <clang-built-linux@googlegroups.com>,
        linux-s390 <linux-s390@vger.kernel.org>,
        Linux-Next Mailing List <linux-next@vger.kernel.org>,
        lkft-triage@lists.linaro.org, Arnd Bergmann <arnd@arndb.de>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Naresh Kamboju <naresh.kamboju@linaro.org>
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On Fri, Jun 18, 2021 at 5:42 PM Heiko Carstens <hca@linux.ibm.com> wrote:
>
> On Thu, Jun 17, 2021 at 12:31:40PM -0700, Nathan Chancellor wrote:
> > clang versions prior to the current development version of 13.0.0 cannot
> > compile s390 after commit 3abbdfde5a65 ("s390/bitops: use register pair
> > instead of register asm") and the s390 maintainers do not intend to work
> > around this in the kernel. Codify this in scripts/min-tool-version.sh
> > similar to arm64 with GCC 5.1.0 so that there are no reports of broken
> > builds.
> >
> > Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
> > Signed-off-by: Nathan Chancellor <nathan@kernel.org>
> > ---
> >
> > This should probably go through the s390 tree with Masahiro's ack.

Acked-by: Masahiro Yamada <masahiroy@kernel.org>


> Thank's a lot!
>
> I'll add the below text to the commit message, and apply it internally
> first:
>
> [hca@linux.ibm.com: breaking compatibility with older clang compilers
>  is intended to finally make use of a feature which allows the
>  compiler to allocate even/odd register pairs. This is possible since
>  a very long time with gcc, but only since llvm-project commit
>  d058262b1471 ("[SystemZ] Support i128 inline asm operands.") with
>  clang. Using that feature allows to get rid of error prone register
>  asm statements, of which the above named kernel commit is only the
>  first of a larger not yet complete series]
>
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-- 
Best Regards
Masahiro Yamada