Hi "Stephan, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on char-misc/char-misc-testing] [also build test WARNING on cryptodev/master crypto/master v5.9-rc2 next-20200825] [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/Stephan-M-ller/dev-random-a-new-approach-with-full-SP800-90B-compliance/20200825-153914 base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git d162219c655c8cf8003128a13840d6c1e183fb80 config: microblaze-randconfig-r023-20200825 (attached as .config) compiler: microblaze-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=microblaze If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> drivers/char/lrng/lrng_drng.c:381:6: warning: no previous prototype for 'lrng_reset' [-Wmissing-prototypes] 381 | void lrng_reset(void) | ^~~~~~~~~~ # https://github.com/0day-ci/linux/commit/b5cc1c486b8491ab0a3817a48964bfd4797484c8 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Stephan-M-ller/dev-random-a-new-approach-with-full-SP800-90B-compliance/20200825-153914 git checkout b5cc1c486b8491ab0a3817a48964bfd4797484c8 vim +/lrng_reset +381 drivers/char/lrng/lrng_drng.c 380 > 381 void lrng_reset(void) 382 { 383 schedule_work(&lrng_reset_work); 384 } 385 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org