Hi Yajun, Thank you for the patch! Yet something to improve: [auto build test ERROR on net-next/master] url: https://github.com/0day-ci/linux/commits/Yajun-Deng/of-net-move-nvmem_get... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git d1f24712a86abd04d82cf4b00fb4ab8ff2d23c8a config: arc-allyesconfig (attached as .config) compiler: arceb-elf-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/10748c5429eced2d22c6cf10e8dcdef8a... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Yajun-Deng/of-net-move-nvmem_get_mac_address-into-of_get_mac_addr_nvmem/20211013-162802 git checkout 10748c5429eced2d22c6cf10e8dcdef8a1a5c38d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arc 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 >>): net/core/of_net.c: In function 'of_get_mac_addr_nvmem': 66 | int ret; | ^~~ cc1: all warnings being treated as errors vim +/ret +66 net/core/of_net.c 3eb46a1da78dff drivers/of/of_net.c Sergei Shtylyov 2015-03-18 59 83216e3988cd19 drivers/of/of_net.c Michael Walle 2021-04-12 60 static int of_get_mac_addr_nvmem(struct device_node *np, u8 *addr) d01f449c008a3f drivers/of/of_net.c Petr Štetiar 2019-05-03 61 { d01f449c008a3f drivers/of/of_net.c Petr Štetiar 2019-05-03 62 struct platform_device *pdev = of_find_device_by_node(np); f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 63 struct nvmem_cell *cell; f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 64 const void *mac; f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 65 size_t len; 83216e3988cd19 drivers/of/of_net.c Michael Walle 2021-04-12 @66 int ret; d01f449c008a3f drivers/of/of_net.c Petr Štetiar 2019-05-03 67 f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 68 /* Try lookup by device first, there might be a nvmem_cell_lookup f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 69 * associated with a given device. f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 70 */ 10748c5429eced net/core/of_net.c Yajun Deng 2021-10-13 71 if (pdev) 10748c5429eced net/core/of_net.c Yajun Deng 2021-10-13 72 cell = nvmem_cell_get(&pdev->dev, "mac-address"); 10748c5429eced net/core/of_net.c Yajun Deng 2021-10-13 73 else f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 74 cell = of_nvmem_cell_get(np, "mac-address"); 10748c5429eced net/core/of_net.c Yajun Deng 2021-10-13 75 f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 76 if (IS_ERR(cell)) f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 77 return PTR_ERR(cell); f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 78 f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 79 mac = nvmem_cell_read(cell, &len); f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 80 nvmem_cell_put(cell); f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 81 f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 82 if (IS_ERR(mac)) f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 83 return PTR_ERR(mac); f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 84 f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 85 if (len != ETH_ALEN || !is_valid_ether_addr(mac)) { f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 86 kfree(mac); f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 87 return -EINVAL; f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 88 } f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 89 10748c5429eced net/core/of_net.c Yajun Deng 2021-10-13 90 ether_addr_copy(addr, mac); f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 91 kfree(mac); f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 92 10748c5429eced net/core/of_net.c Yajun Deng 2021-10-13 93 if (pdev) 10748c5429eced net/core/of_net.c Yajun Deng 2021-10-13 94 put_device(&pdev->dev); 10748c5429eced net/core/of_net.c Yajun Deng 2021-10-13 95 f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 96 return 0; f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 97 } f10843e04a0752 drivers/of/of_net.c Michael Walle 2021-04-12 98 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org