[kbuild-all] arch/mips/boot/compressed/bswapsi.c:5:22: warning: no previous prototype for function '__bswapsi2'

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(a)intel.com&gt; All warnings (new ones prefixed by >>): 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. -- 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