linux-kernel - Re: [PATCH 6.1 000/127] 6.1.45-rc1 review

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Message-ID: <078d6e3d-9572-a624-2c5a-e2d58473e6d0@roeck-us.net>
Date:   Thu, 10 Aug 2023 20:41:42 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        clang-built-linux <llvm@...ts.linux.dev>
Cc:     stable@...r.kernel.org, patches@...ts.linux.dev,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        akpm@...ux-foundation.org, shuah@...nel.org, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, pavel@...x.de, jonathanh@...dia.com,
        f.fainelli@...il.com, sudipm.mukherjee@...il.com,
        srw@...dewatkins.net, rwarsow@....de, conor@...nel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sven Volkinsfeld <thyrc@....net>,
        Daniel Kolesa <daniel@...aforge.org>
Subject: Re: [PATCH 6.1 000/127] 6.1.45-rc1 review

On 8/10/23 20:22, Naresh Kamboju wrote:
> On Wed, 9 Aug 2023 at 16:21, Greg Kroah-Hartman
> <gregkh@...uxfoundation.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@...aro.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