Hi, I love your patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.13-rc6 next-20210617] [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/trix-redhat-com/fpga-reorganize-... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 94f0b2d4a1d0c52035aef425da5e022bd2cb1c71 config: arm-randconfig-r011-20210618 (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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/0day-ci/linux/commit/0bd65980328487e0974bffd1493b183e2... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review trix-redhat-com/fpga-reorganize-to-subdirs/20210616-231900 git checkout 0bd65980328487e0974bffd1493b183e2e413fbd # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 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 >>): drivers/fpga/xilinx/xilinx-pr-decoupler.c:37:19: warning: unused function 'xlnx_pr_decouple_read' [-Wunused-function] static inline u32 xlnx_pr_decouple_read(const struct xlnx_pr_decoupler_data *d, ^ static const struct of_device_id xlnx_pr_decoupler_of_match[] = { ^ 2 warnings generated. -- static const struct of_device_id xlnx_spi_of_match[] = { ^ 1 warning generated. vim +/xlnx_pr_decoupler_of_match +92 drivers/fpga/xilinx/xilinx-pr-decoupler.c 30a2ac9a8bb5fc drivers/fpga/xilinx-pr-decoupler.c Nava kishore Manne 2021-02-11 91 7e961c12be424c drivers/fpga/xilinx-pr-decoupler.c Moritz Fischer 2017-03-24 @92 static const struct of_device_id xlnx_pr_decoupler_of_match[] = { 30a2ac9a8bb5fc drivers/fpga/xilinx-pr-decoupler.c Nava kishore Manne 2021-02-11 93 { .compatible = "xlnx,pr-decoupler-1.00", .data = &decoupler_config }, 30a2ac9a8bb5fc drivers/fpga/xilinx-pr-decoupler.c Nava kishore Manne 2021-02-11 94 { .compatible = "xlnx,pr-decoupler", .data = &decoupler_config }, 30a2ac9a8bb5fc drivers/fpga/xilinx-pr-decoupler.c Nava kishore Manne 2021-02-11 95 { .compatible = "xlnx,dfx-axi-shutdown-manager-1.00", 30a2ac9a8bb5fc drivers/fpga/xilinx-pr-decoupler.c Nava kishore Manne 2021-02-11 96 .data = &shutdown_config }, 30a2ac9a8bb5fc drivers/fpga/xilinx-pr-decoupler.c Nava kishore Manne 2021-02-11 97 { .compatible = "xlnx,dfx-axi-shutdown-manager", 30a2ac9a8bb5fc drivers/fpga/xilinx-pr-decoupler.c Nava kishore Manne 2021-02-11 98 .data = &shutdown_config }, 7e961c12be424c drivers/fpga/xilinx-pr-decoupler.c Moritz Fischer 2017-03-24 99 {}, 7e961c12be424c drivers/fpga/xilinx-pr-decoupler.c Moritz Fischer 2017-03-24 100 }; 7e961c12be424c drivers/fpga/xilinx-pr-decoupler.c Moritz Fischer 2017-03-24 101 MODULE_DEVICE_TABLE(of, xlnx_pr_decoupler_of_match); 7e961c12be424c drivers/fpga/xilinx-pr-decoupler.c Moritz Fischer 2017-03-24 102 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org