Hi Daniel, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on regulator/for-next] [also build test WARNING on linux/master linus/master platform-drivers-x86/for-next v5.14-rc7 next-20210824] [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/Daniel-Scally/Add-regulator_look... base: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git for-next config: riscv-randconfig-r013-20210824 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d26000e4cc2bc65e207a84fa26cb6e374d60aa12) 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 # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/0day-ci/linux/commit/ccd472afd1dd7290ca3e48124903410b2... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Daniel-Scally/Add-regulator_lookup_list-and-API/20210825-070828 git checkout ccd472afd1dd7290ca3e48124903410b2f3edc12 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): regulator_lookup_init_data(const struct regulator_desc *desc, ^ drivers/regulator/core.c:5345:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct regulator_init_data * ^ static 1 warning generated. vim +/regulator_lookup_init_data +5346 drivers/regulator/core.c 5334 5335 /** 5336 * regulator_lookup_init_data - Check regulator_lookup_list for matching entries 5337 * @desc: Regulator desc containing name of the regulator 5338 * @cfg: Regulator config containing pointer to the registering device 5339 * 5340 * Calling this function scans the regulator_lookup_list and checks each entry 5341 * to see if the .device_name and .regulator_name fields match the device name 5342 * and regulator name contained in @cfg and @desc. If so, a pointer to the 5343 * embedded &struct regulator_init_data is returned. No matches returns NULL. 5344 */ 5345 struct regulator_init_data * 5347 const struct regulator_config *cfg) 5348 { 5349 struct regulator_lookup *lookup; 5350 5351 if (!desc || !cfg || !cfg->dev) 5352 return NULL; 5353 5354 mutex_lock(&regulator_lookup_mutex); 5355 5356 list_for_each_entry(lookup, &regulator_lookup_list, list) { 5357 /* 5358 * We need the lookup to have at least a device_name or there's 5359 * no guarantee of a match, and regulator_register() checks to 5360 * make sure that desc->name is not null, so any entry with 5361 * either field null is invalid. 5362 */ 5363 if (!lookup->device_name || !lookup->regulator_name) 5364 continue; 5365 5366 if (strcmp(lookup->device_name, dev_name(cfg->dev))) 5367 continue; 5368 5369 if (strcmp(lookup->regulator_name, desc->name)) 5370 continue; 5371 5372 goto found; 5373 } 5374 5375 lookup = NULL; 5376 5377 found: 5378 mutex_unlock(&regulator_lookup_mutex); 5379 5380 return lookup ? &lookup->init_data : NULL; 5381 } 5382 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org