[linux-next:master 1888/14054] WARNING: modpost: vmlinux.o(.text+0x50f236): Section mismatch in reference from the function cpumask_clear_cpu() to the variable .init.data:pcpu_build_alloc_info.mask

[linux-next:master 1888/14054] WARNING: modpost: vmlinux.o(.text+0x50f236): Section mismatch in reference from the function cpumask_clear_cpu() to the variable .init.data:pcpu_build_alloc_info.mask

[kernel test robot]

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Hi Wonhyuk,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   4c6ed015c2a57c3b385265895a69a87f87da8e28
commit: 6c207504ae7937ac70a1d753c250eb6ab125d70e [1888/14054] percpu: reduce the number of cpu distance comparisons
config: x86_64-randconfig-a013-20201221 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project cee1e7d14f4628d6174b33640d502bff3b54ae45)
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/next/linux-next.git/commit/?id=6c207504ae7937ac70a1d753c250eb6ab125d70e
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 6c207504ae7937ac70a1d753c250eb6ab125d70e
        # 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@intel.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> WARNING: modpost: vmlinux.o(.text+0x50f236): Section mismatch in reference from the function cpumask_clear_cpu() to the variable .init.data:pcpu_build_alloc_info.mask
The function cpumask_clear_cpu() references
the variable __initdata pcpu_build_alloc_info.mask.
This is often because cpumask_clear_cpu lacks a __initdata
annotation or the annotation of pcpu_build_alloc_info.mask is wrong.

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

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Re: [linux-next:master 1888/14054] WARNING: modpost: vmlinux.o(.text+0x50f236): Section mismatch in reference from the function cpumask_clear_cpu() to the variable .init.data:pcpu_build_alloc_info.mask

[Dennis Zhou]

Hi Wonhyuk,

On Tue, Dec 22, 2020 at 04:07:59AM +0800, kernel test robot wrote:
> Hi Wonhyuk,
> 
> FYI, the error/warning still remains.
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   4c6ed015c2a57c3b385265895a69a87f87da8e28
> commit: 6c207504ae7937ac70a1d753c250eb6ab125d70e [1888/14054] percpu: reduce the number of cpu distance comparisons
> config: x86_64-randconfig-a013-20201221 (attached as .config)
> compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project cee1e7d14f4628d6174b33640d502bff3b54ae45)
> 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/next/linux-next.git/commit/?id=6c207504ae7937ac70a1d753c250eb6ab125d70e
>         git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
>         git fetch --no-tags linux-next master
>         git checkout 6c207504ae7937ac70a1d753c250eb6ab125d70e
>         # 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@intel.com>
> 
> All warnings (new ones prefixed by >>, old ones prefixed by <<):
> 
> >> WARNING: modpost: vmlinux.o(.text+0x50f236): Section mismatch in reference from the function cpumask_clear_cpu() to the variable .init.data:pcpu_build_alloc_info.mask
> The function cpumask_clear_cpu() references
> the variable __initdata pcpu_build_alloc_info.mask.
> This is often because cpumask_clear_cpu lacks a __initdata
> annotation or the annotation of pcpu_build_alloc_info.mask is wrong.
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

This is my fault, I didn't have time to look into this until recently.
The issue is that the second call to cpumask_clear_cpu() is not being
inlined resulting in the warning above. Because this is purely a qol
fix, I'm going to move this from for-5.11 to for-5.12 and figure out the
best way to fix this warning.

Thanks,
Dennis