linux-kernel - arch/powerpc/mm/mem.c:53:12: error: no previous prototype for function 'create_section

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Date:   Wed, 30 Jun 2021 14:01:46 +0800
From:   kernel test robot <lkp@...el.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Michael Ellerman <mpe@...erman.id.au>
Subject: arch/powerpc/mm/mem.c:53:12: error: no previous prototype for
 function 'create_section_mapping'

Hi Christophe,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   007b350a58754a93ca9fe50c498cc27780171153
commit: b26e8f27253a47bff90972b987112fd8396e9b8d powerpc/mem: Move cache flushing functions into mm/cacheflush.c
date:   3 months ago
config: powerpc64-randconfig-r005-20210628 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d21d5472501460933e78aead04cf59579025ba4)
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/torvalds/linux.git/commit/?id=b26e8f27253a47bff90972b987112fd8396e9b8d
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout b26e8f27253a47bff90972b987112fd8396e9b8d
        # 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@...el.com>

All errors (new ones prefixed by >>):

   In file included from arch/powerpc/mm/mem.c:15:
   In file included from include/linux/memblock.h:13:
   In file included from include/linux/mm.h:9:
   In file included from include/linux/mmdebug.h:5:
   In file included from include/linux/bug.h:5:
   In file included from arch/powerpc/include/asm/bug.h:109:
   In file included from include/asm-generic/bug.h:20:
   In file included from include/linux/kernel.h:11:
   In file included from include/linux/bitops.h:32:
   In file included from arch/powerpc/include/asm/bitops.h:62:
   arch/powerpc/include/asm/barrier.h:49:9: error: '__lwsync' macro redefined [-Werror,-Wmacro-redefined]
   #define __lwsync()      __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory")
           ^
   <built-in>:310:9: note: previous definition is here
   #define __lwsync __builtin_ppc_lwsync
           ^
>> arch/powerpc/mm/mem.c:53:12: error: no previous prototype for function 'create_section_mapping' [-Werror,-Wmissing-prototypes]
   int __weak create_section_mapping(unsigned long start, unsigned long end,
              ^
   arch/powerpc/mm/mem.c:53:1: 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 
   2 errors generated.


vim +/create_section_mapping +53 arch/powerpc/mm/mem.c

bc02af93dd2bbd Yasunori Goto          2006-06-27  52  
4e00c5affdd4b0 Logan Gunthorpe        2020-04-10 @53  int __weak create_section_mapping(unsigned long start, unsigned long end,
4e00c5affdd4b0 Logan Gunthorpe        2020-04-10  54  				  int nid, pgprot_t prot)
fecbfabe1dc940 Benjamin Herrenschmidt 2016-07-05  55  {
fecbfabe1dc940 Benjamin Herrenschmidt 2016-07-05  56  	return -ENODEV;
fecbfabe1dc940 Benjamin Herrenschmidt 2016-07-05  57  }
fecbfabe1dc940 Benjamin Herrenschmidt 2016-07-05  58  

:::::: The code at line 53 was first introduced by commit
:::::: 4e00c5affdd4b04e6392001716333971932f3d0c powerpc/mm: thread pgprot_t through create_section_mapping()

:::::: TO: Logan Gunthorpe <logang@...tatee.com>
:::::: CC: Linus Torvalds <torvalds@...ux-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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