tree: https://android.googlesource.com/kernel/common android-5.4-stable head: 7bbd50f11d3086fe75fac78882de0d42e27293fa commit: 7bbd50f11d3086fe75fac78882de0d42e27293fa [1/1] ANDROID: arch: arm64: vdso: export the symbols for time() config: arm64-allyesconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 10.3.0 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 git remote add android-common https://android.googlesource.com/kernel/common git fetch --no-tags android-common android-5.4-stable git checkout 7bbd50f11d3086fe75fac78882de0d42e27293fa # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=arm64 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 >>): arch/arm64/kernel/vdso/vgettimeofday.c:9:5: warning: no previous prototype for '__kernel_clock_gettime' [-Wmissing-prototypes] 9 | int __kernel_clock_gettime(clockid_t clock, | ^~~~~~~~~~~~~~~~~~~~~~ arch/arm64/kernel/vdso/vgettimeofday.c:15:5: warning: no previous prototype for '__kernel_gettimeofday' [-Wmissing-prototypes] 15 | int __kernel_gettimeofday(struct __kernel_old_timeval *tv, | ^~~~~~~~~~~~~~~~~~~~~ arch/arm64/kernel/vdso/vgettimeofday.c:21:5: warning: no previous prototype for '__kernel_clock_getres' [-Wmissing-prototypes] 21 | int __kernel_clock_getres(clockid_t clock_id, | ^~~~~~~~~~~~~~~~~~~~~ 27 | time_t __kernel_time(time_t *time) | ^~~~~~~~~~~~~ -- arch/arm64/kernel/vdso/vgettimeofday.c:9:5: warning: no previous prototype for '__kernel_clock_gettime' [-Wmissing-prototypes] 9 | int __kernel_clock_gettime(clockid_t clock, | ^~~~~~~~~~~~~~~~~~~~~~ arch/arm64/kernel/vdso/vgettimeofday.c:15:5: warning: no previous prototype for '__kernel_gettimeofday' [-Wmissing-prototypes] 15 | int __kernel_gettimeofday(struct __kernel_old_timeval *tv, | ^~~~~~~~~~~~~~~~~~~~~ arch/arm64/kernel/vdso/vgettimeofday.c:21:5: warning: no previous prototype for '__kernel_clock_getres' [-Wmissing-prototypes] 21 | int __kernel_clock_getres(clockid_t clock_id, | ^~~~~~~~~~~~~~~~~~~~~ 27 | time_t __kernel_time(time_t *time) | ^~~~~~~~~~~~~ vim +/__kernel_time +27 arch/arm64/kernel/vdso/vgettimeofday.c 10 struct __kernel_timespec *ts) 11 { 12 return __cvdso_clock_gettime(clock, ts); 13 } 14 15 int __kernel_gettimeofday(struct __kernel_old_timeval *tv, 16 struct timezone *tz) 17 { 18 return __cvdso_gettimeofday(tv, tz); 19 } 20 21 int __kernel_clock_getres(clockid_t clock_id, 22 struct __kernel_timespec *res) 23 { 24 return __cvdso_clock_getres(clock_id, res); 25 } 26 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org