linux-kernel - Re: WARNING: modpost: vmlinux.o(.text+0x1a8edb8): Section mismatch in reference from the function stop_machine() to the function .init.text:intel_rng_hw

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Message-ID: <83ab58cb-581f-135f-21fd-05c15860cafa@suse.com>
Date:   Wed, 24 Feb 2021 15:26:31 +0100
From:   Jürgen Groß <jgross@...e.com>
To:     kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, Borislav Petkov <bp@...e.de>
Subject: Re: WARNING: modpost: vmlinux.o(.text+0x1a8edb8): Section mismatch in
 reference from the function stop_machine() to the function
 .init.text:intel_rng_hw_init()

On 24.02.21 15:20, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   c03c21ba6f4e95e406a1a7b4c34ef334b977c194
> commit: ab234a260b1f625b26cbefa93ca365b0ae66df33 x86/pv: Rework arch_local_irq_restore() to not use popf
> date:   2 weeks ago
> config: x86_64-randconfig-a005-20210223 (attached as .config)
> compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project f14a14dd2564703db02f80c00db8ae492b594f77)
> 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/torvalds/linux.git/commit/?id=ab234a260b1f625b26cbefa93ca365b0ae66df33
>          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>          git fetch --no-tags linus master
>          git checkout ab234a260b1f625b26cbefa93ca365b0ae66df33
>          # 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@...el.com>
> 
> All warnings (new ones prefixed by >>, old ones prefixed by <<):
> 
>>> WARNING: modpost: vmlinux.o(.text+0x1a8edb8): Section mismatch in reference from the function stop_machine() to the function .init.text:intel_rng_hw_init()
> The function stop_machine() references
> the function __init intel_rng_hw_init().
> This is often because stop_machine lacks a __init
> annotation or the annotation of intel_rng_hw_init is wrong.

I'd be very interested to know how the identified patch would be able to
have this effect.


Juergen

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