Hi Andre, I love your patch! Yet something to improve: [auto build test ERROR on arm64/for-next/core] [also build test ERROR on kvmarm/next linus/master v5.10-rc3 next-20201113] [cannot apply to arm-perf/for-next/perf] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Andre-Przywara/ARM-arm64-Add-SMC... base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core config: arm64-randconfig-r015-20201113 (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 # https://github.com/0day-ci/linux/commit/7eda8946317c66c69354088b975b3122f... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Andre-Przywara/ARM-arm64-Add-SMCCC-TRNG-entropy-service/20201114-022616 git checkout 7eda8946317c66c69354088b975b3122f63a06bf # 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 >>): 15 | bool __ro_after_init smccc_trng_available = false; | ^~~~~~~~~~~~~~~~~~~~ drivers/firmware/smccc/smccc.c: In function 'arm_smccc_version_init': 22 | smccc_trng_available = smccc_probe_trng(); | ^~~~~~~~~~~~~~~~~~~~ drivers/firmware/smccc/smccc.c:22:2: note: each undeclared identifier is reported only once for each function it appears in vim +15 drivers/firmware/smccc/smccc.c 14 16 17 void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit) 18 { 19 smccc_version = version; 20 smccc_conduit = conduit; 21 23 } 24 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org