Hi Mason,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on spi/for-next]
[also build test WARNING on v5.4-rc7]
[cannot apply to next-20191115]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Mason-Yang/mtd-spi-nor-Add-support-for-Octal-8D-8D-8D-mode/20191115-170233
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next
config: c6x-allyesconfig (attached as .config)
compiler: c6x-elf-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=c6x 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   drivers//spi/spi-mxic.c: In function 'mxic_spi_mem_prep_op_cfg':
>> drivers//spi/spi-mxic.c:302:21: warning: comparison of constant '256' with boolean expression is always false [-Wbool-compare]
       if (op->data.dtr == OP_DATA_DDR)
                        ^~

vim +/256 +302 drivers//spi/spi-mxic.c

   282	
   283	static u32 mxic_spi_mem_prep_op_cfg(const struct spi_mem_op *op)
   284	{
   285		u32 cfg =  OP_CMD_BYTES(op->cmd.nbytes) |
   286			   OP_CMD_BUSW(fls(op->cmd.buswidth) - 1) |
   287			   (op->cmd.dtr ? OP_CMD_DDR : 0);
   288	
   289		if (op->addr.nbytes)
   290			cfg |= OP_ADDR_BYTES(op->addr.nbytes) |
   291			       OP_ADDR_BUSW(fls(op->addr.buswidth) - 1) |
   292			       (op->addr.dtr ? OP_ADDR_DDR : 0);
   293	
   294		if (op->dummy.nbytes)
   295			cfg |= OP_DUMMY_CYC(op->dummy.nbytes);
   296	
   297		if (op->data.nbytes) {
   298			cfg |= OP_DATA_BUSW(fls(op->data.buswidth) - 1) |
   299			      (op->data.dtr ? OP_DATA_DDR : 0);
   300			if (op->data.dir == SPI_MEM_DATA_IN) {
   301				cfg |= OP_READ;
 > 302				if (op->data.dtr == OP_DATA_DDR)
   303					cfg |= OP_DQS_EN;
   304			}
   305		}
   306	
   307		return cfg;
   308	}
   309	

---
0-DAY kernel test infrastructure                 Open Source Technology Center
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation