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

[kernel test robot <lkp@intel.com>]

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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)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project b2613fb2f0f53691dd0211895afbb9413457fca7)
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 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 

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 >>):

>> 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.

vim +/create_section_mapping +91 arch/powerpc/mm/mem.c

bc02af93dd2bbdd Yasunori Goto          2006-06-27  90  
4e00c5affdd4b04 Logan Gunthorpe        2020-04-10 @91  int __weak create_section_mapping(unsigned long start, unsigned long end,
4e00c5affdd4b04 Logan Gunthorpe        2020-04-10  92  				  int nid, pgprot_t prot)
fecbfabe1dc9405 Benjamin Herrenschmidt 2016-07-05  93  {
fecbfabe1dc9405 Benjamin Herrenschmidt 2016-07-05  94  	return -ENODEV;
fecbfabe1dc9405 Benjamin Herrenschmidt 2016-07-05  95  }
fecbfabe1dc9405 Benjamin Herrenschmidt 2016-07-05  96  

:::::: The code at line 91 was first introduced by commit
:::::: 4e00c5affdd4b04e6392001716333971932f3d0c powerpc/mm: thread pgprot_t through create_section_mapping()

:::::: TO: Logan Gunthorpe <logang@deltatee.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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

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