[PATCH 3/4] spi: Fix cache corruption due to DMA/PIO overlap

[kernel test robot]

Hi Vincent,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on broonie-spi/for-next]
[also build test WARNING on krzk/for-next linus/master v6.0-rc5 next-20220916]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Vincent-Whitchurch/spi-Fix-DMA-bugs-in-not-only-spi-s3c64xx/20220916-194234
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20220916/202209162337.7NbxJFXD-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 12.1.0
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/intel-lab-lkp/linux/commit/d9c81b85380dadb07e24d2f5dd6b27bacb72845a
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Vincent-Whitchurch/spi-Fix-DMA-bugs-in-not-only-spi-s3c64xx/20220916-194234
        git checkout d9c81b85380dadb07e24d2f5dd6b27bacb72845a
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sh SHELL=/bin/bash drivers/spi/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

>> drivers/spi/spi.c:1243:6: warning: no previous prototype for 'spi_dma_sync_for_device' [-Wmissing-prototypes]
    1243 | void spi_dma_sync_for_device(struct spi_controller *ctrl, struct spi_transfer *xfer)
         |      ^~~~~~~~~~~~~~~~~~~~~~~
>> drivers/spi/spi.c:1247:6: warning: no previous prototype for 'spi_dma_sync_for_cpu' [-Wmissing-prototypes]
    1247 | void spi_dma_sync_for_cpu(struct spi_controller *ctrl, struct spi_transfer *xfer)
         |      ^~~~~~~~~~~~~~~~~~~~


vim +/spi_dma_sync_for_device +1243 drivers/spi/spi.c

  1242	
> 1243	void spi_dma_sync_for_device(struct spi_controller *ctrl, struct spi_transfer *xfer)
  1244	{
  1245	}
  1246	
> 1247	void spi_dma_sync_for_cpu(struct spi_controller *ctrl, struct spi_transfer *xfer)
  1248	{
  1249	}
  1250	#endif /* !CONFIG_HAS_DMA */
  1251	

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