[powerpc:next-test 54/220] arch/powerpc/kernel/vdso32/vgettimeofday.c:13:5: warning: no previous prototype for function '__c_kernel_clock_gettime64'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next-test
head:   4e4ed87981c764498942c52004c620bb8f104eac
commit: d0e3fc69d00d1f50d22d6b6acfc555ccda80ad1e [54/220] powerpc/vdso: Provide __kernel_clock_gettime64() on vdso32
config: powerpc64-randconfig-r011-20201204 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 32c501dd88b62787d3a5ffda7aabcf4650dbe3cd)
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 powerpc64 cross compiling tool for clang build
        # apt-get install binutils-powerpc64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=d0e3fc69d00d1f50d22d6b6acfc555ccda80ad1e
        git remote add powerpc https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git
        git fetch --no-tags powerpc next-test
        git checkout d0e3fc69d00d1f50d22d6b6acfc555ccda80ad1e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All warnings (new ones prefixed by >>):

   arch/powerpc/kernel/vdso32/vgettimeofday.c:7:5: error: conflicting types for '__c_kernel_clock_gettime'
   int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts,
       ^
   arch/powerpc/include/asm/vdso/gettimeofday.h:183:5: note: previous declaration is here
   int __c_kernel_clock_gettime(clockid_t clock, struct __kernel_timespec *ts,
       ^

quoted

arch/powerpc/kernel/vdso32/vgettimeofday.c:13:5: warning: no previous prototype for function '__c_kernel_clock_gettime64' [-Wmissing-prototypes]

   int __c_kernel_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts,
       ^
   arch/powerpc/kernel/vdso32/vgettimeofday.c:13:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int __c_kernel_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts,
   ^
   static 
   arch/powerpc/kernel/vdso32/vgettimeofday.c:25:5: error: conflicting types for '__c_kernel_clock_getres'
   int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res,
       ^
   arch/powerpc/include/asm/vdso/gettimeofday.h:185:5: note: previous declaration is here
   int __c_kernel_clock_getres(clockid_t clock_id, struct __kernel_timespec *res,
       ^
   1 warning and 2 errors generated.

vim +/__c_kernel_clock_gettime64 +13 arch/powerpc/kernel/vdso32/vgettimeofday.c

    12	
  > 13	int __c_kernel_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts,
    14				       const struct vdso_data *vd)
    15	{
    16		return __cvdso_clock_gettime_data(vd, clock, ts);
    17	}
    18	

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0-DAY CI Kernel Test Service, Intel Corporation
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