arch/mips/boot/compressed/bswapsi.c:5:22: warning: no previous prototype for function '__bswapsi2'

arch/mips/boot/compressed/bswapsi.c:5:22: warning: no previous prototype for function '__bswapsi2'

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0bddd227f3dc55975e2b8dfa7fc6f959b062a2c7
commit: ff487d41036035376e47972c7c522490b839ab37 MIPS: Truncate link address into 32bit for 32bit kernel
date:   9 weeks ago
config: mips-randconfig-r012-20200709 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 02946de3802d3bc65bc9f2eb9b8d4969b5a7add8)
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
        git checkout ff487d41036035376e47972c7c522490b839ab37
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 

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/mips/boot/compressed/bswapsi.c:5:22: warning: no previous prototype for function '__bswapsi2' [-Wmissing-prototypes]
   unsigned int notrace __bswapsi2(unsigned int u)
                        ^
   arch/mips/boot/compressed/bswapsi.c:5:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   unsigned int notrace __bswapsi2(unsigned int u)
   ^
   static 
   1 warning generated.
--
>> arch/mips/boot/compressed/ashldi3.c:9:19: warning: no previous prototype for function '__ashldi3' [-Wmissing-prototypes]
   long long notrace __ashldi3(long long u, word_type b)
                     ^
   arch/mips/boot/compressed/ashldi3.c:9:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   long long notrace __ashldi3(long long u, word_type b)
   ^
   static 
   1 warning generated.

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

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