Hi Marek, I love your patch! Perhaps something to improve: [auto build test WARNING on v5.14-rc1] [also build test WARNING on next-20210716] [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/Marek-Vasut/dmaengine-xilinx-Add... base: e73f0f0ee7541171d89f2e2491130c7771ba58d3 config: arm-defconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 10.3.0 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/89cc716182246c22a6c7bdb666952b3ce... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Marek-Vasut/dmaengine-xilinx-Add-empty-device_config-function/20210718-111119 git checkout 89cc716182246c22a6c7bdb666952b3cec945a0a # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=arm SHELL=/bin/bash drivers/dma/xilinx/ 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/dma/xilinx/xilinx_dma.c:800: warning: expecting prototype for xilinx_dma_tx_descriptor(). Prototype was for xilinx_dma_alloc_tx_descriptor() instead drivers/dma/xilinx/xilinx_dma.c:2489: warning: expecting prototype for xilinx_dma_channel_set_config(). Prototype was for xilinx_vdma_channel_set_config() instead vim +1659 drivers/dma/xilinx/xilinx_dma.c 1651 1652 /** 1653 * xilinx_dma_issue_pending - Configure the DMA channel 1654 * @dchan: DMA channel 1655 * @config: channel configuration 1656 */ 1657 static int xilinx_dma_device_config(struct dma_chan *dchan, 1658 struct dma_slave_config *config) 1660 return 0; 1661 } 1662 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org