linux-kernel - Re: [kbuild-all] 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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Date:   Thu, 25 Feb 2021 16:17:21 +0800
From:   Rong Chen <rong.a.chen@...el.com>
To:     Jürgen Groß <jgross@...e.com>,
        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>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [kbuild-all] 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 2/24/21 10:26 PM, Jürgen Groß wrote:
> 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.

Hi Clang Team,

The problem is found by the latest clang, and I can't reproduce it with 
clang-11,
could you take a look?

Best Regards,
Rong Chen