tree: https://github.com/frank-w/BPI-R2-4.14 5.9-r64 head: cd8fe04edbda6f089442fcbdedad421a55e44b21 commit: ce71ea546d2c5bcd9d79dc19dc5a94d5d55b55de [11/14] net: dsa: mt7530: Add the support of MT7531 switch config: nios2-allyesconfig (attached as .config) compiler: nios2-linux-gcc (GCC) 9.3.0 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 git checkout ce71ea546d2c5bcd9d79dc19dc5a94d5d55b55de # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nios2 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 >>): 1976 | mt7531_sgmii_link_up_force(struct dsa_switch *ds, int port, | ^~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/dsa/mt7530.c:2081:6: warning: no previous prototype for 'mt7531_sgmii_restart_an' [-Wmissing-prototypes] 2081 | void mt7531_sgmii_restart_an(struct dsa_switch *ds, int port) | ^~~~~~~~~~~~~~~~~~~~~~~ # https://github.com/frank-w/BPI-R2-4.14/commit/ce71ea546d2c5bcd9d79dc19dc5... git remote add frank-w-bpi-r2-4.14 https://github.com/frank-w/BPI-R2-4.14 git fetch --no-tags frank-w-bpi-r2-4.14 5.9-r64 git checkout ce71ea546d2c5bcd9d79dc19dc5a94d5d55b55de vim +/mt7531_sgmii_link_up_force +1976 drivers/net/dsa/mt7530.c 1974 1975 void 1977 unsigned int mode, phy_interface_t interface, 1978 int speed, int duplex) 1979 { 1980 struct mt7530_priv *priv = ds->priv; 1981 unsigned int val; 1982 1983 /* For adjusting speed and duplex of SGMII force mode. */ 1984 if (interface != PHY_INTERFACE_MODE_SGMII || 1985 phylink_autoneg_inband(mode)) 1986 return; 1987 1988 /* SGMII force mode setting */ 1989 val = mt7530_read(priv, MT7531_SGMII_MODE(port)); 1990 val &= ~MT7531_SGMII_IF_MODE_MASK; 1991 1992 switch (speed) { 1993 case SPEED_10: 1994 val |= MT7531_SGMII_FORCE_SPEED_10; 1995 break; 1996 case SPEED_100: 1997 val |= MT7531_SGMII_FORCE_SPEED_100; 1998 break; 1999 case SPEED_1000: 2000 val |= MT7531_SGMII_FORCE_SPEED_1000; 2001 break; 2002 } 2003 2004 /* MT7531 SGMII 1G force mode can only work in full duplex mode, 2005 * no matter MT7531_SGMII_FORCE_HALF_DUPLEX is set or not. 2006 */ 2007 if ((speed == SPEED_10 || speed == SPEED_100) && 2008 duplex != DUPLEX_FULL) 2009 val |= MT7531_SGMII_FORCE_HALF_DUPLEX; 2010 2011 mt7530_write(priv, MT7531_SGMII_MODE(port), val); 2012 } 2013 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org