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    Subjectarch/mips/boot/compressed/../../lib/bswapsi.c:5:22: warning: no previous prototype for function '__bswapsi2'
    Hi Masahiro,

    FYI, the error/warning still remains.

    tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
    head: e2ae0d4a6b0ba461542f0fd0ba0b828658013e9f
    commit: f78b25ee922ef6faf59a258af1b9388ca894cfd9 mips: decompressor: do not copy source files while building
    date: 6 weeks ago
    config: mips-buildonly-randconfig-r003-20211226 (https://download.01.org/0day-ci/archive/20211226/202112261150.2zpinfBb-lkp@intel.com/config)
    compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 0c553cc1af2e4c14100df6cf4a6fc91987e778e6)
    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=f78b25ee922ef6faf59a258af1b9388ca894cfd9
    git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
    git fetch --no-tags linus master
    git checkout f78b25ee922ef6faf59a258af1b9388ca894cfd9
    # save the config file to linux build tree
    mkdir build_dir
    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@intel.com>

    All warnings (new ones prefixed by >>):

    In file included from arch/mips/boot/compressed/bswapsi.c:2:
    >> arch/mips/boot/compressed/../../lib/bswapsi.c:5:22: warning: no previous prototype for function '__bswapsi2' [-Wmissing-prototypes]
    unsigned int notrace __bswapsi2(unsigned int u)
    ^
    arch/mips/boot/compressed/../../lib/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.


    vim +/__bswapsi2 +5 arch/mips/boot/compressed/../../lib/bswapsi.c

    1ee3630a3e57f3 Ralf Baechle 2015-09-29 4
    aedcfbe06558a9 Harvey Hunt 2016-05-25 @5 unsigned int notrace __bswapsi2(unsigned int u)
    1ee3630a3e57f3 Ralf Baechle 2015-09-29 6 {
    1ee3630a3e57f3 Ralf Baechle 2015-09-29 7 return (((u) & 0xff000000) >> 24) |
    1ee3630a3e57f3 Ralf Baechle 2015-09-29 8 (((u) & 0x00ff0000) >> 8) |
    1ee3630a3e57f3 Ralf Baechle 2015-09-29 9 (((u) & 0x0000ff00) << 8) |
    1ee3630a3e57f3 Ralf Baechle 2015-09-29 10 (((u) & 0x000000ff) << 24);
    1ee3630a3e57f3 Ralf Baechle 2015-09-29 11 }
    1ee3630a3e57f3 Ralf Baechle 2015-09-29 12

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

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

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

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