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-empty-device_config-function/20210718-111119
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/89cc716182246c22a6c7bdb666952b3cec945a0a
        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@intel.com>

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:1659: warning: expecting prototype for xilinx_dma_issue_pending(). Prototype was for xilinx_dma_device_config() 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)
> 1659	{
  1660		return 0;
  1661	}
  1662	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org