Hi Dave, I love your patch! Perhaps something to improve: [auto build test WARNING on vkoul-dmaengine/next] [also build test WARNING on v5.13-rc2] [cannot apply to next-20210521] [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/Dave-Jiang/Fix-idxd-sub-drivers-... base: https://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git next config: x86_64-randconfig-a005-20210523 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project e84a9b9bb3051c35dea993cdad7b3d2575638f85) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/0day-ci/linux/commit/42d79fbe271bbc2b3790fc938d6e024a4... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Dave-Jiang/Fix-idxd-sub-drivers-setup/20210522-230724 git checkout 42d79fbe271bbc2b3790fc938d6e024a430700e8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 (test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/dma/idxd/device.c:1270:6: note: uninitialized use occurs here if (rc < 0) ^~ drivers/dma/idxd/device.c:1267:2: note: remove the 'if' if its condition is always true if (test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/dma/idxd/device.c:1255:8: note: initialize the variable 'rc' to silence this warning int rc; ^ = 0 1 warning generated. vim +1267 drivers/dma/idxd/device.c 1250 1251 int idxd_device_drv_probe(struct idxd_dev *idxd_dev) 1252 { 1253 struct idxd_device *idxd = idxd_dev_to_idxd(idxd_dev); 1254 unsigned long flags; 1255 int rc; 1256 1257 /* 1258 * Device should be in disabled state for the idxd_drv to load. If it's in 1259 * enabled state, then the device was altered outside of driver's control. 1260 * If the state is in halted state, then we don't want to proceed. 1261 */ 1262 if (idxd->state != IDXD_DEV_DISABLED) 1263 return -ENXIO; 1264 1265 /* Device configuration */ 1266 spin_lock_irqsave(&idxd->dev_lock, flags); --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org