Hi Nicolai, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on char-misc/char-misc-testing] [also build test ERROR on arm64/for-next/core powerpc/next s390/features tip/x86/core linus/master v5.9-rc6 next-20200921] [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/Nicolai-Stange/random-possible-w... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git 8fd0e2a6df262539eaa28b0a2364cca10d1dc662 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 >>): In file included from include/linux/random.h:121, from arch/arm64/include/asm/pointer_auth.h:6, from arch/arm64/include/asm/processor.h:39, from include/linux/mutex.h:19, from include/linux/kernfs.h:12, from include/linux/sysfs.h:16, from include/linux/kobject.h:20, from include/linux/of.h:17, from include/linux/irqdomain.h:35, from include/linux/acpi.h:13, from include/acpi/apei.h:9, from include/acpi/ghes.h:5, from include/linux/arm_sdei.h:8, from arch/arm64/kernel/asm-offsets.c:10: 45 | static inine bool arch_has_sp800_90b_random_seed(void) | ^~~~~ 45 | static inine bool arch_has_sp800_90b_random_seed(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ make[2]: *** [scripts/Makefile.build:117: arch/arm64/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1198: prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:185: __sub-make] Error 2 make: Target 'prepare' not remade because of errors. # https://github.com/0day-ci/linux/commit/af235fdbda320942f96e2530990620871... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Nicolai-Stange/random-possible-ways-towards-NIST-SP800-90B-compliance/20200921-160315 git checkout af235fdbda320942f96e2530990620871f47c9d0 vim +/inine +45 arch/arm64/include/asm/archrandom.h 34 35 static inline bool arch_has_random_seed(void) 36 { 37 /* 38 * Only support the generic interface after we have detected 39 * the system wide capability, avoiding complexity with the 40 * cpufeature code and with potential scheduling between CPUs 41 * with and without the feature. 42 */ 43 return cpus_have_const_cap(ARM64_HAS_RNG); 44 } 46 { 47 /* 48 * Section K.12.1 from the Arm Architecture Reference Manual 49 * Armv8" (DDI0487F) sounds like RNDRRS could qualify as a 50 * NIST SP800-90C NRBG, but we're currently using RNDR only. 51 */ 52 return false; 53 } 54 static inline bool __must_check arch_get_random_long(unsigned long *v) 55 { 56 return false; 57 } 58 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org