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    Subject[rcu:dev.2020.12.23a 133/149] kernel/time/clocksource.c:220:6: warning: no previous prototype for function 'clocksource_verify_one_cpu'
    tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2020.12.23a
    head: 7cc07f4867eb9618d4f7c35ddfbd746131b52f51
    commit: 6a70298420b2bd6d3e3dc86d81b993f618df8569 [133/149] clocksource: Check per-CPU clock synchronization when marked unstable
    config: x86_64-randconfig-r013-20201223 (attached as .config)
    compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project cee1e7d14f4628d6174b33640d502bff3b54ae45)
    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 x86_64 cross compiling tool for clang build
    # apt-get install binutils-x86-64-linux-gnu
    # https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?id=6a70298420b2bd6d3e3dc86d81b993f618df8569
    git remote add rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
    git fetch --no-tags rcu dev.2020.12.23a
    git checkout 6a70298420b2bd6d3e3dc86d81b993f618df8569
    # save the attached .config to linux build tree
    COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64

    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 >>):

    >> kernel/time/clocksource.c:220:6: warning: no previous prototype for function 'clocksource_verify_one_cpu' [-Wmissing-prototypes]
    void clocksource_verify_one_cpu(void *csin)
    ^
    kernel/time/clocksource.c:220:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    void clocksource_verify_one_cpu(void *csin)
    ^
    static
    1 warning generated.


    vim +/clocksource_verify_one_cpu +220 kernel/time/clocksource.c

    219
    > 220 void clocksource_verify_one_cpu(void *csin)
    221 {
    222 struct clocksource *cs = (struct clocksource *)csin;
    223
    224 __this_cpu_write(csnow_mid, cs->read(cs));
    225 }
    226

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