linux-kernel - Re: [next] [clang] s390: clang: error: unable to execute command: Segmentation fault (core dumped)

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Date:   Thu, 17 Jun 2021 16:55:43 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        lkft-triage@...ts.linaro.org,
        open list <linux-kernel@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Vasily Gorbik <gor@...ux.ibm.com>
Subject: Re: [next] [clang] s390: clang: error: unable to execute command:
 Segmentation fault (core dumped)

On Thu, Jun 17, 2021 at 06:19:14PM +0530, Naresh Kamboju wrote:
> The git bisect found the first bad commit,
> The first bad commit:
> commit 3abbdfde5a6588a92209cd8b131769b8058e7c21
> Author: Heiko Carstens <hca@...ux.ibm.com>
> Date:   Wed Jun 9 22:59:13 2021 +0200
>     s390/bitops: use register pair instead of register asm
> 
>     Get rid of register asm statement and use a register pair.
>     This allows the compiler to allocate registers on its own.
> 
>     Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
>     Signed-off-by: Vasily Gorbik <gor@...ux.ibm.com>
>  arch/s390/include/asm/bitops.h | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> Previous HEAD position was 3abbdfde5a65 s390/bitops: use register pair
> instead of register asm
> HEAD is now at 7d9c6b8147bd Add linux-next specific files for 20210617

You need clang-13 development version which contains commit
d058262b1471 ("[SystemZ] Support i128 inline asm operands.").
Every older clang version won't be able to complile the kernel for
s390 anymore.

This is intended and won't be fixed.