tree: https://android.googlesource.com/kernel/common android11-5.4 head: 68ecddcda842c77056d25f446fc30573c625c828 commit: a5ebd44814f4303c7b249833698574d48ebf1aae [8789/10079] UPSTREAM: arm64: Introduce a way to disable the 32bit vdso config: arm-randconfig-r001-20210120 (attached as .config) compiler: arm-linux-gnueabi-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 git remote add android-common https://android.googlesource.com/kernel/common git fetch --no-tags android-common android11-5.4 git checkout a5ebd44814f4303c7b249833698574d48ebf1aae # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 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 >>): arch/arm/kernel/vdso.c: In function 'tk_is_cntvct': 284 | if (tk->tkr_mono.clock->archdata.clock_mode != VDSO_CLOCKMODE_ARCHTIMER) | ^~~~~~~~~~~~~~~~~~~~~~~~ | VDSO_CLOCKMODE_TIMENS arch/arm/kernel/vdso.c:284:49: note: each undeclared identifier is reported only once for each function it appears in vim +284 arch/arm/kernel/vdso.c 278 279 static bool tk_is_cntvct(const struct timekeeper *tk) 280 { 281 if (!IS_ENABLED(CONFIG_ARM_ARCH_TIMER)) 282 return false; 283 285 return false; 286 287 return true; 288 } 289 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org