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Date:   Mon, 11 Oct 2021 12:00:49 +0200
From:   Heiko Carstens <hca@linux.ibm.com>
To:     Naresh Kamboju <naresh.kamboju@linaro.org>
Cc:     llvm@lists.linux.dev, linux-s390@vger.kernel.org,
        clang-built-linux <clang-built-linux@googlegroups.com>,
        open list <linux-kernel@vger.kernel.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Alexander Egorenkov <egorenar@linux.ibm.com>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Andreas Krebbel <krebbel@linux.ibm.com>,
        Ulrich Weigand <Ulrich.Weigand@de.ibm.com>,
        Jonas Paulsson <paulsson@linux.vnet.ibm.com>
Subject: Re: clang-13: s390/kernel/head64.S:24:17: error: invalid operand for
 instruction
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References: <CA+G9fYuqwJD5bFO74vG6Mvbbt1G8rxzd_NDHg-gtOZ6rPjeu3A@mail.gmail.com>
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On Mon, Oct 11, 2021 at 11:47:42AM +0530, Naresh Kamboju wrote:
> [Please ignore this email if it is already reported ]
> 
> Following s390 builds failed due to warnings / errors.
> 
> metadata:
>     git_describe: v5.15-rc5
>     git_repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>     git_short_log: 64570fbc14f8 (\"Linux 5.15-rc5\")
>     target_arch: s390
>     toolchain: clang-13
> 
> 
> Fail (2861 errors) s390 (tinyconfig) with clang-nightly
>   @ https://builds.tuxbuild.com/1zL35IUSGhDGeVuyIrAp7eyzEUi/
> Fail (2861 errors) s390 (tinyconfig) with clang-13
>   @ https://builds.tuxbuild.com/1zL35Hn7wjErKsLDM6zAgh27BYJ/
> Fail (4112 errors) s390 (allnoconfig) with clang-13
>   @ https://builds.tuxbuild.com/1zL35HR60hSFvBmAcYJvKHm8Lko/
> Fail (4112 errors) s390 (allnoconfig) with clang-nightly
>   @ https://builds.tuxbuild.com/1zL35DTlrX9qRGCtGqgtmmMDjnQ/
> Fail (23048 errors) s390 (defconfig) with clang-13
>   @ https://builds.tuxbuild.com/1zL35DE2KWQUPxbbXeTbwIJaWXS/
> Fail (23045 errors) s390 (defconfig) with clang-nightly
>   @ https://builds.tuxbuild.com/1zL35EgeQfWQDXDupp4itkUO5At/
> 
> 
> Build errors log:
> ----------------
> arch/s390/kernel/head64.S:24:17: error: invalid operand for instruction
>  lctlg %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
>                 ^
> arch/s390/kernel/head64.S:40:8: error: invalid operand for instruction
>  lpswe .Ldw-.(%r13) # load disabled wait psw

You need to pass LLVM_IAS=0 on the make command line on s390 since
commit f12b034afeb3 ("scripts/Makefile.clang: default to LLVM_IAS=1").

LLVM's integrated assembler doesn't seem to work well when compiling
the kernel for s390 yet.