Hi Nava, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on char-misc/char-misc-testing] [also build test WARNING on robh/for-next linus/master v5.12-rc8 next-20210420] [cannot apply to xlnx/master] [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/Nava-kishore-Manne/misc-doc-Add-... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git 9204ff94868496f2d9b8b173af52ec455160c364 config: h8300-randconfig-r006-20210420 (attached as .config) compiler: h8300-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 # https://github.com/0day-ci/linux/commit/af0a9229443d76e4125dea6297fd56ea5... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Nava-kishore-Manne/misc-doc-Add-binding-doc-for-the-afi-config-driver/20210420-171153 git checkout af0a9229443d76e4125dea6297fd56ea5f8f2a81 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=h8300 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 >>): vim +27 drivers/misc/zynq-afi.c 18 19 /** 20 * struct afi_fpga - AFI register description 21 * @membase: pointer to register struct 22 * @afi_width: AFI bus width to be written 23 */ 24 struct zynq_afi_fpga { 25 void __iomem *membase; 26 u32 afi_width; 28 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org