tree: git://git.armlinux.org.uk/~rmk/linux-arm.git zii head: 9f8234d7e443de598635ed7a7ac69753ce3e71d4 commit: 968d6c22446ff44207fd9b4b7750a0035661036a [15/47] net: phy: at803x: simplify custom phy id matching config: arm64-randconfig-r032-20210916 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c8b3d7d6d6de37af68b2f379d0e37304f78e115f) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu git remote add arm git://git.armlinux.org.uk/~rmk/linux-arm.git git fetch --no-tags arm zii git checkout 968d6c22446ff44207fd9b4b7750a0035661036a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All errors (new ones prefixed by >>): >> drivers/net/phy/at803x.c:706:7: error: implicit declaration of function 'at803x_match_phy_id' [-Werror,-Wimplicit-function-declaration] if (!at803x_match_phy_id(phydev, ATH8031_PHY_ID)) ^ 1 error generated. 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 :::::: The code at line 706 was first introduced by commit :::::: b856150c8098f12996ee81c3ab2a65adbaeeb3ec net: phy: at803x: mask 1000 Base-X link mode :::::: TO: David Bauer :::::: CC: David S. Miller --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org