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Sender: Guenter Roeck <groeck7@gmail.com>
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Date:   Thu, 10 Aug 2023 20:41:42 -0700
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Subject: Re: [PATCH 6.1 000/127] 6.1.45-rc1 review
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To:     Naresh Kamboju <naresh.kamboju@linaro.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        clang-built-linux <llvm@lists.linux.dev>
Cc:     stable@vger.kernel.org, patches@lists.linux.dev,
        linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
        akpm@linux-foundation.org, shuah@kernel.org, patches@kernelci.org,
        lkft-triage@lists.linaro.org, pavel@denx.de, jonathanh@nvidia.com,
        f.fainelli@gmail.com, sudipm.mukherjee@gmail.com,
        srw@sladewatkins.net, rwarsow@gmx.de, conor@kernel.org,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Sven Volkinsfeld <thyrc@gmx.net>,
        Daniel Kolesa <daniel@octaforge.org>
References: <20230809103636.615294317@linuxfoundation.org>
 <CA+G9fYvQdQqTqCgbS4sit_Y2AtKtDiWMOkGZjoeSEFhc=M_jKw@mail.gmail.com>
From:   Guenter Roeck <linux@roeck-us.net>
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On 8/10/23 20:22, Naresh Kamboju wrote:
> On Wed, 9 Aug 2023 at 16:21, Greg Kroah-Hartman
> <gregkh@linuxfoundation.org> wrote:
>>
>> This is the start of the stable review cycle for the 6.1.45 release.
>> There are 127 patches in this series, all will be posted as a response
>> to this one.  If anyone has any issues with these being applied, please
>> let me know.
>>
>> Responses should be made by Fri, 11 Aug 2023 10:36:10 +0000.
>> Anything received after that time might be too late.
>>
>> The whole patch series can be found in one patch at:
>>          https://www.kernel.org/pub/linux/kernel/v6.x/stable-review/patch-6.1.45-rc1.gz
>> or in the git tree and branch at:
>>          git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-6.1.y
>> and the diffstat can be found below.
>>
>> thanks,
>>
>> greg k-h
> 
> 
> While building Linux stable rc 6.1 x86_64 with clang-17 failed due to
> following warnings / errors.
> 
> Regressions found on x86_64:
> 
>    - build/clang-nightly-lkftconfig-kselftest
>    - build/clang-nightly-x86_64_defconfig
>    - build/clang-nightly-lkftconfig
>    - build/clang-lkftconfig
>    - build/clang-nightly-allmodconfig
> 
> 
> Build errors:
> -----
> ld.lld: error: ./arch/x86/kernel/vmlinux.lds:193: at least one side of
> the expression must be absolute
> make[2]: *** [scripts/Makefile.vmlinux:34: vmlinux] Error 1
> 

We see that with v5.10.y, v5.15.y, and v6.1.y when building ChromeOS images with
clang/lld. There are additional problems with LTO and the built-in assembler. See
https://www.linuxquestions.org/questions/slackware-14/error-building-kernel-6-1-44-on-current-with-clang-4175727865/
for a summary.

As far as I can see none of those problems has been fixed in the upstream kernel.

Guenter

> 
>    Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
> 
> upstream report:
> -----
>      - https://lore.kernel.org/llvm/CA+G9fYsdUeNu-gwbs0+T6XHi4hYYk=Y9725-wFhZ7gJMspLDRA@mail.gmail.com/
> 
> Proposed fix patch:
> -----
>    [PATCH] x86/srso: fix build breakage for LD=ld.lld
>    - https://lore.kernel.org/lkml/20230809-gds-v1-1-eaac90b0cbcc@google.com/T/
> 
> This patch is yet to be backported and CC to stable.
> 
>    --
> Linaro LKFT
> https://lkft.linaro.org