tree: https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git for-mfd-next head: ae387961ae94021c2322c59e069e7476fb7702f7 commit: 70d48975c152997bea1c715de3382ef854c288ed [56/58] mfd: core: Make a best effort attempt to match devices with the correct of_nodes config: arm-randconfig-r025-20200716 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project ed6b578040a85977026c93bf4188f996148f3218) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi git checkout 70d48975c152997bea1c715de3382ef854c288ed # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 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 >>): of_node_addr = of_read_number(reg, of_n_addr_cells(np)); ^ 1 error generated. vim +/of_read_number +147 drivers/mfd/mfd-core.c 119 120 static int mfd_match_of_node_to_dev(struct platform_device *pdev, 121 struct device_node *np, 122 const struct mfd_cell *cell) 123 { 124 struct mfd_of_node_entry *of_entry; 125 const __be32 *reg; 126 u64 of_node_addr; 127 128 /* Skip devices 'disabled' by Device Tree */ 129 if (!of_device_is_available(np)) 130 return -ENODEV; 131 132 /* Skip if OF node has previously been allocated to a device */ 133 list_for_each_entry(of_entry, &mfd_of_node_list, list) 134 if (of_entry->np == np) 135 return -EAGAIN; 136 137 if (!cell->use_of_reg) 138 /* No of_reg defined - allocate first free compatible match */ 139 goto allocate_of_node; 140 141 /* We only care about each node's first defined address */ 142 reg = of_get_address(np, 0, NULL, NULL); 143 if (!reg) 144 /* OF node does not contatin a 'reg' property to match to */ 145 return -EAGAIN; 146 148 149 if (cell->of_reg != of_node_addr) 150 /* No match */ 151 return -EAGAIN; 152 153 allocate_of_node: 154 of_entry = kzalloc(sizeof(*of_entry), GFP_KERNEL); 155 if (!of_entry) 156 return -ENOMEM; 157 158 of_entry->dev = &pdev->dev; 159 of_entry->np = np; 160 list_add_tail(&of_entry->list, &mfd_of_node_list); 161 162 pdev->dev.of_node = np; 163 pdev->dev.fwnode = &np->fwnode; 164 165 return 0; 166 } 167 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org