tree:   https://github.com/stffrdhrn/linux.git litex-gpio-fix
head:   6f903ad53b35652c15f91265053f437a6b6f17f0
commit: 85b04bca0da9f332aff3820373b7169644d7332b [15/26] LiteX: driver for SPI Flash (mtd) device
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 9.3.0
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/stffrdhrn/linux/commit/85b04bca0da9f332aff3820373b7169644d7332b
        git remote add stffrdhrn https://github.com/stffrdhrn/linux.git
        git fetch --no-tags stffrdhrn litex-gpio-fix
        git checkout 85b04bca0da9f332aff3820373b7169644d7332b
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=ia64 

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

All errors (new ones prefixed by >>):

   drivers/mtd/spi-nor/litex-spiflash.c: In function 'cs':
   drivers/mtd/spi-nor/litex-spiflash.c:71:20: error: implicit declaration of function 'litex_get_reg'; did you mean '_litex_get_reg'? [-Werror=implicit-function-declaration]
      71 |  u8 curr_val = (u8)litex_get_reg(spi->base + SPIFLASH_BITBANG_OFFSET, SPIFLASH_BITBANG_SIZE);
         |                    ^~~~~~~~~~~~~
         |                    _litex_get_reg
   drivers/mtd/spi-nor/litex-spiflash.c:75:2: error: implicit declaration of function 'litex_set_reg'; did you mean '_litex_set_reg'? [-Werror=implicit-function-declaration]
      75 |  litex_set_reg(spi->base + SPIFLASH_BITBANG_OFFSET, SPIFLASH_BITBANG_SIZE, set_val);
         |  ^~~~~~~~~~~~~
         |  _litex_set_reg
   drivers/mtd/spi-nor/litex-spiflash.c: At top level:
>> drivers/mtd/spi-nor/litex-spiflash.c:305:15: error: initialization of 'int (*)(struct spi_nor *, u8,  const u8 *, size_t)' {aka 'int (*)(struct spi_nor *, unsigned char,  const unsigned char *, long unsigned int)'} from incompatible pointer type 'ssize_t (*)(struct spi_nor *, u8,  const u8 *, size_t)' {aka 'long int (*)(struct spi_nor *, unsigned char,  const unsigned char *, long unsigned int)'} [-Werror=incompatible-pointer-types]
     305 |  .write_reg = spi_flash_nor_write_reg,
         |               ^~~~~~~~~~~~~~~~~~~~~~~
   drivers/mtd/spi-nor/litex-spiflash.c:305:15: note: (near initialization for 'litex_spi_controller_ops.write_reg')
   cc1: some warnings being treated as errors


vim +305 drivers/mtd/spi-nor/litex-spiflash.c

   300	
   301	static const struct spi_nor_controller_ops litex_spi_controller_ops = {
   302		.read = spi_flash_nor_read,
   303		.write = spi_flash_nor_write,
   304		.read_reg = spi_flash_nor_read_reg,
 > 305		.write_reg = spi_flash_nor_write_reg,
   306		.erase = spi_flash_nor_erase,
   307	};
   308	

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