Hi Mark, Thank you for the patch! Yet something to improve: [auto build test ERROR on arm64/for-next/core] [also build test ERROR on soc/for-next linus/master v5.8-rc1 next-20200615] [cannot apply to linux/master] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Mark-Salyzyn/arch-arm64-vdso-exp... base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core config: arm64-allyesconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 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 errors (new ones prefixed by >>, old 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) | ^~~~~~ | timer_t arch/arm64/kernel/vdso/vgettimeofday.c:27:22: error: unknown type name 'time_t'; did you mean 'timer_t'? 27 | time_t __kernel_time(time_t *time) | ^~~~~~ | timer_t make[2]: *** [scripts/Makefile.build:267: arch/arm64/kernel/vdso/vgettimeofday.o] Error 1 make[2]: Target 'include/generated/vdso-offsets.h' not remade because of errors. make[1]: *** [arch/arm64/Makefile:183: vdso_prepare] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:180: sub-make] Error 2 make: Target 'prepare' not remade because of errors. vim +27 arch/arm64/kernel/vdso/vgettimeofday.c 26 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org