Re: [linux-stable-rc:linux-5.4.y 2231/4843] ERROR: "__memcat_p" undefined!

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On Mon, Feb 15, 2021 at 2:49 AM kernel test robot <lkp@xxxxxxxxx> wrote:
>
> Hi Nick,
>
> First bad commit (maybe != root cause):
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.4.y
> head:   642aa3284e09f63bf1d4832798dd787b4320ca64
> commit: f05f667f8764f9ec834ca3e412ed7f5a20dea3bf [2231/4843] lib/string.c: implement stpcpy
> config: x86_64-randconfig-a005-20210215 (attached as .config)
> compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install x86_64 cross compiling tool for clang build
>         # apt-get install binutils-x86-64-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=f05f667f8764f9ec834ca3e412ed7f5a20dea3bf
>         git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
>         git fetch --no-tags linux-stable-rc linux-5.4.y
>         git checkout f05f667f8764f9ec834ca3e412ed7f5a20dea3bf
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
>
> All errors (new ones prefixed by >>):
>
> >> ERROR: "__memcat_p" [drivers/hwtracing/stm/stm_core.ko] undefined!

This error is unrelated to the referenced commit, but we did fix this
error finally in 5.7:
https://github.com/ClangBuiltLinux/linux/issues/515. This is not a
regression, but something that never worked with LLD until 5.7.

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7273ad2b08f8ac9563579d16a3cf528857b26f49
looks like the commit of interest, though I seem to have left a
comment implying there were dependencies:
https://github.com/ClangBuiltLinux/linux/issues/515#issuecomment-612999929
(I no longer recall what they were).

Some other commits in tree reference that bug from the issue tracker.
https://github.com/0day-ci/linux/commit/0cf9baa2dbb8ca29f30ac8a1afb69de51f222d17
https://github.com/0day-ci/linux/commit/565508bb949dd72638b52522fb6ac6ec04ec57fc
https://github.com/0day-ci/linux/commit/0d0537aa772566473bd5310be3874060cbff8672

Not sure whether all 4 of the above worth backporting to 4.4.y?
Thoughts? (Perhaps these would allow us to add x86_64 allmodconfig CI
coverage with LLD for 4.4.y)

>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx



-- 
Thanks,
~Nick Desaulniers



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