linux-kernel - arch/mips/boot/compressed/../../lib/bswapdi.c:5:28: warning: no previous prototype for function '_

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Message-ID: <202204222130.Bc3dL9dC-lkp@intel.com>
Date:   Fri, 22 Apr 2022 21:13:27 +0800
From:   kernel test robot <lkp@...el.com>
To:     YunQiang Su <yunqiang.su@...united.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Subject: arch/mips/boot/compressed/../../lib/bswapdi.c:5:28: warning: no
 previous prototype for function '__bswapdi2'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d569e86915b7f2f9795588591c8d5ea0b66481cb
commit: 31b2f3dc851c65fee288612432c4fc956f1a264e MIPS: enable both vmlinux.gz.itb and vmlinuz for generic
date:   4 months ago
config: mips-randconfig-r003-20220422 (https://download.01.org/0day-ci/archive/20220422/202204222130.Bc3dL9dC-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 5bd87350a5ae429baf8f373cb226a57b62f87280)
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 mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=31b2f3dc851c65fee288612432c4fc956f1a264e
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 31b2f3dc851c65fee288612432c4fc956f1a264e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash

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/mips/boot/compressed/bswapdi.c:2:
>> arch/mips/boot/compressed/../../lib/bswapdi.c:5:28: warning: no previous prototype for function '__bswapdi2' [-Wmissing-prototypes]
   unsigned long long notrace __bswapdi2(unsigned long long u)
                              ^
   arch/mips/boot/compressed/../../lib/bswapdi.c:5:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   unsigned long long notrace __bswapdi2(unsigned long long u)
   ^
   static 
   1 warning generated.


vim +/__bswapdi2 +5 arch/mips/boot/compressed/../../lib/bswapdi.c

1ee3630a3e57f3 Ralf Baechle 2015-09-29   4  
aedcfbe06558a9 Harvey Hunt  2016-05-25  @5  unsigned long long notrace __bswapdi2(unsigned long long u)
1ee3630a3e57f3 Ralf Baechle 2015-09-29   6  {
1ee3630a3e57f3 Ralf Baechle 2015-09-29   7  	return (((u) & 0xff00000000000000ull) >> 56) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29   8  	       (((u) & 0x00ff000000000000ull) >> 40) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29   9  	       (((u) & 0x0000ff0000000000ull) >> 24) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29  10  	       (((u) & 0x000000ff00000000ull) >>  8) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29  11  	       (((u) & 0x00000000ff000000ull) <<  8) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29  12  	       (((u) & 0x0000000000ff0000ull) << 24) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29  13  	       (((u) & 0x000000000000ff00ull) << 40) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29  14  	       (((u) & 0x00000000000000ffull) << 56);
1ee3630a3e57f3 Ralf Baechle 2015-09-29  15  }
1ee3630a3e57f3 Ralf Baechle 2015-09-29  16  

:::::: The code at line 5 was first introduced by commit
:::::: aedcfbe06558a9f53002e82d5be64c6c94687726 MIPS: lib: Mark intrinsics notrace

:::::: TO: Harvey Hunt <harvey.hunt@...tec.com>
:::::: CC: Ralf Baechle <ralf@...ux-mips.org>

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp