Hi Russell, I love your patch! Yet something to improve: [auto build test ERROR on net-next/master] url: https://github.com/0day-ci/linux/commits/Russell-King/net-phy-at803x-simp... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git e93abb840a2c356ed2809c31fcedb058601ac2e4 config: powerpc-allmodconfig (attached as .config) compiler: powerpc-linux-gcc (GCC) 10.3.0 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/2f590b7f42d30d029ec56cec8429effe8... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Russell-King/net-phy-at803x-simplify-custom-phy-id-matching/20210720-214010 git checkout 2f590b7f42d30d029ec56cec8429effe8505cfb9 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=powerpc 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 >>): drivers/net/phy/at803x.c: In function 'at803x_get_features': 706 | if (!at803x_match_phy_id(phydev, ATH8031_PHY_ID)) | ^~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/at803x_match_phy_id +706 drivers/net/phy/at803x.c 2318ca8aef3877 Michael Walle 2020-01-30 697 b856150c8098f1 David Bauer 2021-06-27 698 static int at803x_get_features(struct phy_device *phydev) b856150c8098f1 David Bauer 2021-06-27 699 { b856150c8098f1 David Bauer 2021-06-27 700 int err; b856150c8098f1 David Bauer 2021-06-27 701 b856150c8098f1 David Bauer 2021-06-27 702 err = genphy_read_abilities(phydev); b856150c8098f1 David Bauer 2021-06-27 703 if (err) b856150c8098f1 David Bauer 2021-06-27 704 return err; b856150c8098f1 David Bauer 2021-06-27 705 b856150c8098f1 David Bauer 2021-06-27 @706 if (!at803x_match_phy_id(phydev, ATH8031_PHY_ID)) b856150c8098f1 David Bauer 2021-06-27 707 return 0; b856150c8098f1 David Bauer 2021-06-27 708 b856150c8098f1 David Bauer 2021-06-27 709 /* AR8031/AR8033 have different status registers b856150c8098f1 David Bauer 2021-06-27 710 * for copper and fiber operation. However, the b856150c8098f1 David Bauer 2021-06-27 711 * extended status register is the same for both b856150c8098f1 David Bauer 2021-06-27 712 * operation modes. b856150c8098f1 David Bauer 2021-06-27 713 * b856150c8098f1 David Bauer 2021-06-27 714 * As a result of that, ESTATUS_1000_XFULL is set b856150c8098f1 David Bauer 2021-06-27 715 * to 1 even when operating in copper TP mode. b856150c8098f1 David Bauer 2021-06-27 716 * b856150c8098f1 David Bauer 2021-06-27 717 * Remove this mode from the supported link modes, b856150c8098f1 David Bauer 2021-06-27 718 * as this driver currently only supports copper b856150c8098f1 David Bauer 2021-06-27 719 * operation. b856150c8098f1 David Bauer 2021-06-27 720 */ b856150c8098f1 David Bauer 2021-06-27 721 linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT, b856150c8098f1 David Bauer 2021-06-27 722 phydev->supported); b856150c8098f1 David Bauer 2021-06-27 723 return 0; b856150c8098f1 David Bauer 2021-06-27 724 } b856150c8098f1 David Bauer 2021-06-27 725 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org