Hi Srinivas, I love your patch! Yet something to improve: [auto build test ERROR on rafael-pm/linux-next] [also build test ERROR on linus/master v5.17-rc3] [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/Srinivas-Pandruvada/ACPI-fan-Add... base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next config: i386-defconfig (https://download.01.org/0day-ci/archive/20220212/202202120604.Qxt5VNqx-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/367e082b5f2d1c640b906682cffcb7195... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Srinivas-Pandruvada/ACPI-fan-Add-fine-grain-control/20220212-001118 git checkout 367e082b5f2d1c640b906682cffcb7195e722f26 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ld: drivers/acpi/fan_core.o: in function `fan_get_cur_state': --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org