Hi Grzegorz, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on hwmon/hwmon-next] [also build test WARNING on soc/for-next linus/master v5.13-rc6 next-20210616] [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/Grzegorz-Jaszczyk/introduce-watc... base: https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next config: arm64-randconfig-r022-20210615 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://github.com/0day-ci/linux/commit/71dadcad8da1862c1205b19ddf4279d49... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Grzegorz-Jaszczyk/introduce-watchdog_dev_suspend-resume/20210616-201447 git checkout 71dadcad8da1862c1205b19ddf4279d494e57545 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang 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 warnings (new ones prefixed by >>): if (watchdog_worker_should_ping(wd_data)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:56:28: note: expanded from macro 'if' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:58:30: note: expanded from macro '__trace_if_var' #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/watchdog/watchdog_dev.c:1236:6: note: uninitialized use occurs here if (ret) ^~~ include/linux/compiler.h:56:47: note: expanded from macro 'if' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^~~~ include/linux/compiler.h:58:52: note: expanded from macro '__trace_if_var' #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond)) ^~~~ drivers/watchdog/watchdog_dev.c:1232:2: note: remove the 'if' if its condition is always true if (watchdog_worker_should_ping(wd_data)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:56:23: note: expanded from macro 'if' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^ drivers/watchdog/watchdog_dev.c:1225:9: note: initialize the variable 'ret' to silence this warning int ret; ^ = 0 drivers/watchdog/watchdog_dev.c:1263:2: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] if (watchdog_worker_should_ping(wd_data)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:56:28: note: expanded from macro 'if' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:58:30: note: expanded from macro '__trace_if_var' #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/watchdog/watchdog_dev.c:1267:9: note: uninitialized use occurs here return ret; ^~~ drivers/watchdog/watchdog_dev.c:1263:2: note: remove the 'if' if its condition is always true if (watchdog_worker_should_ping(wd_data)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:56:23: note: expanded from macro 'if' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^ drivers/watchdog/watchdog_dev.c:1253:9: note: initialize the variable 'ret' to silence this warning int ret; ^ = 0 2 warnings generated. vim +1232 drivers/watchdog/watchdog_dev.c 1221 1222 int watchdog_dev_suspend(struct watchdog_device *wdd) 1223 { 1224 struct watchdog_core_data *wd_data = wdd->wd_data; 1225 int ret; 1226 1227 if (!wdd->wd_data) 1228 return -ENODEV; 1229 1230 /* ping for the last time before suspend */ 1231 mutex_lock(&wd_data->lock); 1233 ret = __watchdog_ping(wd_data->wdd); 1234 mutex_unlock(&wd_data->lock); 1235 1236 if (ret) 1237 return ret; 1238 1239 /* 1240 * make sure that watchdog worker will not kick in when the wdog is 1241 * suspended 1242 */ 1243 hrtimer_cancel(&wd_data->timer); 1244 kthread_cancel_work_sync(&wd_data->work); 1245 1246 return 0; 1247 } 1248 EXPORT_SYMBOL_GPL(watchdog_dev_suspend); 1249 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org