tree: https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git for-mfd-next head: c23452e6a319bc607b54a1cce9c74c9033565af3 commit: c509ed7e7d376a7bc3aeb17133c0d117a887916a [56/66] mfd: core: Make a best effort attempt to match devices with the correct of_nodes config: x86_64-randconfig-r025-20200719 (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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout c509ed7e7d376a7bc3aeb17133c0d117a887916a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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 >>): } ^ 1 warning generated. vim +168 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 #if IS_ENABLED(CONFIG_OF) 125 struct mfd_of_node_entry *of_entry; 126 const __be32 *reg; 127 u64 of_node_addr; 128 129 /* Skip devices 'disabled' by Device Tree */ 130 if (!of_device_is_available(np)) 131 return -ENODEV; 132 133 /* Skip if OF node has previously been allocated to a device */ 134 list_for_each_entry(of_entry, &mfd_of_node_list, list) 135 if (of_entry->np == np) 136 return -EAGAIN; 137 138 if (!cell->use_of_reg) 139 /* No of_reg defined - allocate first free compatible match */ 140 goto allocate_of_node; 141 142 /* We only care about each node's first defined address */ 143 reg = of_get_address(np, 0, NULL, NULL); 144 if (!reg) 145 /* OF node does not contatin a 'reg' property to match to */ 146 return -EAGAIN; 147 148 of_node_addr = of_read_number(reg, of_n_addr_cells(np)); 149 150 if (cell->of_reg != of_node_addr) 151 /* No match */ 152 return -EAGAIN; 153 154 allocate_of_node: 155 of_entry = kzalloc(sizeof(*of_entry), GFP_KERNEL); 156 if (!of_entry) 157 return -ENOMEM; 158 159 of_entry->dev = &pdev->dev; 160 of_entry->np = np; 161 list_add_tail(&of_entry->list, &mfd_of_node_list); 162 163 pdev->dev.of_node = np; 164 pdev->dev.fwnode = &np->fwnode; 165 166 return 0; 167 #endif 169 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org