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()

[Rong Chen]

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@xxxxxxxxx>
> >
> > 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