tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 64677779e8962c20b580b471790fe42367750599 commit: 9fdd78f7bcda3e6a9f53c355529b3bf037c0e24f mtd: rawnand: xway: Stop using nand_release() date: 3 weeks ago config: mips-xway_defconfig (attached as .config) compiler: mips-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 git checkout 9fdd78f7bcda3e6a9f53c355529b3bf037c0e24f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/mtd/nand/raw/xway_nand.c: In function 'xway_nand_remove': 227 | ret = mtd_device_unregister(mtd); | ^~~ drivers/mtd/nand/raw/xway_nand.c:227:30: note: each undeclared identifier is reported only once for each function it appears in vim +/mtd +227 drivers/mtd/nand/raw/xway_nand.c 217 218 /* 219 * Remove a NAND device. 220 */ 221 static int xway_nand_remove(struct platform_device *pdev) 222 { 223 struct xway_nand_data *data = platform_get_drvdata(pdev); 224 struct nand_chip *chip = &data->chip; 225 int ret; 226 228 WARN_ON(ret); 229 nand_cleanup(chip); 230 231 return 0; 232 } 233 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org