Re: [linux-next:master 5868/6773] arch/powerpc/mm/mem.c:91:12: warning: no previous prototype for function 'create_section_mapping'

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On Wed, Nov 18, 2020 at 11:22 AM Dan Williams <dan.j.williams@xxxxxxxxx> wrote:
>
> On Wed, Nov 18, 2020 at 4:27 AM kernel test robot <lkp@xxxxxxxxx> wrote:
> >
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> > head:   2052923327794192c5d884623b5ee5fec1867bda
> > commit: d106ad47e292fde47fc09e16a2ddc13609ff2ad1 [5868/6773] mm-fix-phys_to_target_node-and-memory_add_physaddr_to_nid-exports-v4
> > config: powerpc64-randconfig-r026-20201118 (attached as .config)

^ randconfig

> > compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project b2613fb2f0f53691dd0211895afbb9413457fca7)
> > reproduce (this is a W=1 build):

^ W=1

> >         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> >         chmod +x ~/bin/make.cross
> >         # install powerpc64 cross compiling tool for clang build
> >         # apt-get install binutils-powerpc64-linux-gnu
> >         # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=d106ad47e292fde47fc09e16a2ddc13609ff2ad1
> >         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 d106ad47e292fde47fc09e16a2ddc13609ff2ad1
> >         # save the attached .config to linux build tree
> >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64
>
> I get:
>
> Makefile:597: arch/powerpc64/Makefile: No such file or directory
> make[1]: *** No rule to make target 'arch/powerpc64/Makefile'.  Stop.
> make: *** [Makefile:712: include/config/auto.conf.cmd] Error 2
>
> ...changing it to ARCH=powerpc I get:
>
> Assembler messages:
> Fatal error: invalid listing option `3'
> clang: error: assembler command failed with exit code 1 (use -v to see
> invocation)
> make[1]: *** [scripts/Makefile.build:283: scripts/mod/empty.o] Error 1
> make[1]: *** Waiting for unfinished jobs....
> make: *** [Makefile:1199: prepare0] Error 2
>
> This is on a Fedora 31 host.
>
> >
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@xxxxxxxxx>
> >
> > All warnings (new ones prefixed by >>):
> >
> > >> arch/powerpc/mm/mem.c:91:12: warning: no previous prototype for function 'create_section_mapping' [-Wmissing-prototypes]
> >    int __weak create_section_mapping(unsigned long start, unsigned long end,
> >               ^
> >    arch/powerpc/mm/mem.c:91:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> >    int __weak create_section_mapping(unsigned long start, unsigned long end,
> >    ^
> >    static
> >    1 warning generated.
>
> I do not see these errors with gcc.
>
> I feel like clang errors should be flagged / de-emphasized when the
> same error does not appear on gcc.

Note this is a W=1 build. For this warning, you either need to mark
functions as having static linkage, or provide a prototype in a header
so that callers know the correct function signature.
-- 
Thanks,
~Nick Desaulniers




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