Hi Colin, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on next-20211217] [also build test WARNING on v5.16-rc5] [cannot apply to net-next/master lee-mfd/for-mfd-next linusw-pinctrl/devel net/master horms-ipvs/master linus/master v5.16-rc5 v5.16-rc4 v5.16-rc3] [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] url: https://github.com/0day-ci/linux/commits/Colin-Foster/add-support-for-VSC... base: c122052c3cb861b3e61a01d2c2ab9069e470663e config: m68k-allmodconfig (https://download.01.org/0day-ci/archive/20211219/202112190908.GDAHmtPe-lk...) compiler: m68k-linux-gcc (GCC) 11.2.0 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/0day-ci/linux/commit/ec7f2a8290ac0b1f74a64884f16444c56... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Colin-Foster/add-support-for-VSC75XX-control-over-SPI/20211219-055252 git checkout ec7f2a8290ac0b1f74a64884f16444c56edb274f # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=m68k SHELL=/bin/bash drivers/mfd/ 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 >>): drivers/mfd/ocelot-spi.c: In function 'ocelot_spi_reg_read': 124 | struct ocelot_spi *ocelot_spi; | ^~~~~~~~~~ vim +/ocelot_spi +124 drivers/mfd/ocelot-spi.c 118 119 static int ocelot_spi_reg_read(void *context, unsigned int reg, 120 unsigned int *val) 121 { 122 struct ocelot_spi_regmap_context *regmap_context = context; 123 struct spi_transfer tx, padding, rx; 125 struct spi_message msg; 126 struct spi_device *spi; 127 unsigned int addr; 128 u8 *tx_buf; 129 130 WARN_ON(!val); 131 132 spi = regmap_context->spi; 133 134 ocelot_spi = spi_get_drvdata(spi); 135 136 addr = ocelot_spi_translate_address(reg + regmap_context->base); 137 tx_buf = (u8 *)&addr; 138 139 spi_message_init(&msg); 140 141 memset(&tx, 0, sizeof(struct spi_transfer)); 142 143 /* Ignore the first byte for the 24-bit address */ 144 tx.tx_buf = &tx_buf[1]; 145 tx.len = 3; 146 147 spi_message_add_tail(&tx, &msg); 148 149 if (regmap_context->padding_bytes > 0) { 150 u8 dummy_buf[16] = {0}; 151 152 memset(&padding, 0, sizeof(struct spi_transfer)); 153 154 /* Just toggle the clock for padding bytes */ 155 padding.len = regmap_context->padding_bytes; 156 padding.tx_buf = dummy_buf; 157 padding.dummy_data = 1; 158 159 spi_message_add_tail(&padding, &msg); 160 } 161 162 memset(&rx, 0, sizeof(struct spi_transfer)); 163 rx.rx_buf = val; 164 rx.len = 4; 165 166 spi_message_add_tail(&rx, &msg); 167 168 return spi_sync(spi, &msg); 169 } 170 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org