tree: https://github.com/ambarus/linux-0day spi-nor/next-sst26-locking head: 4953dd5ca5cc7613b46aec1b26713518994f7aa1 commit: 4953dd5ca5cc7613b46aec1b26713518994f7aa1 [21/21] mtd: spi-nor: sst: Add Individual Block Locking support config: x86_64-randconfig-a014-20210415 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 6a18cc23efad410db48a3ccfc233d215de7d4cb9) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/ambarus/linux-0day/commit/4953dd5ca5cc7613b46aec1b2671... git remote add ambarus https://github.com/ambarus/linux-0day git fetch --no-tags ambarus spi-nor/next-sst26-locking git checkout 4953dd5ca5cc7613b46aec1b26713518994f7aa1 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): vim +39 drivers/mtd/spi-nor/sst.c 17 18 /* 19 * SST26 Memory Organization: 20 * 4 * 8 KByte blocks (read and write protection bits) 21 * 1 * 32 KByte block (write protection bits) 22 * (mtd->size / SZ_64K - 2) * 64Kbyte blocks (write protection bits) 23 * 1 * 32 KByte block (write protection bits) 24 * 4 * 8 KByte blocks (read and write protection bits) 25 */ 26 #define spi_nor_sst26_bpr_len(n_sectors) \ 27 ((((n_sectors) - 2 + 2 + 2 * (4 + 4)) + BITS_PER_BYTE - 1) / BITS_PER_BYTE) 28 29 /** 30 * spi_nor_sst_rbpr() - Read Block-Protection Register on SPI NOR SST26 family. 31 * @nor: pointer to 'struct spi_nor'. 32 * @bpr: pointer to DMA-able buffer where the value of the 33 * Block-Protection Register will be written. 34 * @len: number of bytes to write to the Block-Protection Register. 35 * 36 * Return: 0 on success, -errno otherwise. 37 */ 38 static int spi_nor_sst26_rbpr(struct spi_nor *nor, u8 *bpr, size_t len) 40 int ret; 41 42 if (nor->spimem) { 43 struct spi_mem_op op = 44 SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_SST26_RBPR, 0), 45 SPI_MEM_OP_NO_ADDR, 46 SPI_MEM_OP_NO_DUMMY, 47 SPI_MEM_OP_DATA_IN(len, bpr, 0)); 48 49 spi_nor_spimem_setup_op(nor, &op, nor->reg_proto); 50 51 ret = spi_mem_exec_op(nor->spimem, &op); 52 } else { 53 ret = spi_nor_controller_ops_read_reg(nor, SPINOR_OP_SST26_RBPR, 54 bpr, len); 55 } 56 57 if (ret) 58 dev_dbg(nor->dev, "error %d reading SST26 BPR\n", ret); 59 60 return ret; 61 } 62 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org