linux-kernel - arch/powerpc/mm/book3s64/pgtable.c:174:15: warning: no previous prototype for function 'create_section

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Date:   Sun, 27 Jun 2021 03:48:13 +0800
From:   kernel test robot <lkp@...el.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Christoph Hellwig <hch@....de>
Subject: arch/powerpc/mm/book3s64/pgtable.c:174:15: warning: no previous
 prototype for function 'create_section_mapping'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   625acffd7ae2c52898d249e6c5c39f348db0d8df
commit: a927bd6ba952d13c52b8b385030943032f659a3e mm: fix phys_to_target_node() and memory_add_physaddr_to_nid() exports
date:   7 months ago
config: powerpc-randconfig-r012-20210627 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 557b101ce714e39438ba1d39c4c50b03e12fcb96)
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 powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a927bd6ba952d13c52b8b385030943032f659a3e
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout a927bd6ba952d13c52b8b385030943032f659a3e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   In file included from arch/powerpc/mm/book3s64/pgtable.c:6:
   In file included from include/linux/sched.h:12:
   In file included from arch/powerpc/include/asm/current.h:13:
   In file included from arch/powerpc/include/asm/paca.h:17:
   In file included from arch/powerpc/include/asm/lppaca.h:46:
   In file included from arch/powerpc/include/asm/mmu.h:144:
   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:12:
   In file included from include/linux/bitops.h:29:
   In file included from arch/powerpc/include/asm/bitops.h:62:
   arch/powerpc/include/asm/barrier.h:49:9: warning: '__lwsync' macro redefined [-Wmacro-redefined]
   #define __lwsync()      __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory")
           ^
   <built-in>:309:9: note: previous definition is here
   #define __lwsync __builtin_ppc_lwsync
           ^
>> arch/powerpc/mm/book3s64/pgtable.c:174:15: warning: no previous prototype for function 'create_section_mapping' [-Wmissing-prototypes]
   int __meminit create_section_mapping(unsigned long start, unsigned long end,
                 ^
   arch/powerpc/mm/book3s64/pgtable.c:174:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int __meminit create_section_mapping(unsigned long start, unsigned long end,
   ^
   static 
   2 warnings generated.


vim +/create_section_mapping +174 arch/powerpc/mm/book3s64/pgtable.c

32b53c012e0bfe arch/powerpc/mm/pgtable-book3s64.c Reza Arbab      2017-01-03  172  
32b53c012e0bfe arch/powerpc/mm/pgtable-book3s64.c Reza Arbab      2017-01-03  173  #ifdef CONFIG_MEMORY_HOTPLUG
4e00c5affdd4b0 arch/powerpc/mm/book3s64/pgtable.c Logan Gunthorpe 2020-04-10 @174  int __meminit create_section_mapping(unsigned long start, unsigned long end,
4e00c5affdd4b0 arch/powerpc/mm/book3s64/pgtable.c Logan Gunthorpe 2020-04-10  175  				     int nid, pgprot_t prot)
32b53c012e0bfe arch/powerpc/mm/pgtable-book3s64.c Reza Arbab      2017-01-03  176  {
32b53c012e0bfe arch/powerpc/mm/pgtable-book3s64.c Reza Arbab      2017-01-03  177  	if (radix_enabled())
4e00c5affdd4b0 arch/powerpc/mm/book3s64/pgtable.c Logan Gunthorpe 2020-04-10  178  		return radix__create_section_mapping(start, end, nid, prot);
32b53c012e0bfe arch/powerpc/mm/pgtable-book3s64.c Reza Arbab      2017-01-03  179  
4e00c5affdd4b0 arch/powerpc/mm/book3s64/pgtable.c Logan Gunthorpe 2020-04-10  180  	return hash__create_section_mapping(start, end, nid, prot);
32b53c012e0bfe arch/powerpc/mm/pgtable-book3s64.c Reza Arbab      2017-01-03  181  }
32b53c012e0bfe arch/powerpc/mm/pgtable-book3s64.c Reza Arbab      2017-01-03  182  

:::::: The code at line 174 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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