Hi Russell, First bad commit (maybe != root cause): tree: git://git.armlinux.org.uk/~rmk/linux-arm.git clearfog head: 81fa62b801fcff2960aaf3ae50d586e84ad41fb1 commit: 79d4556027c96d9cb569bf50ae889fd148344999 [2/13] net: dsa: mv88e6xxx: debugfs hacks to fix the compile config: nios2-allyesconfig (attached as .config) compiler: nios2-linux-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 git remote add arm git://git.armlinux.org.uk/~rmk/linux-arm.git git fetch --no-tags arm clearfog git checkout 79d4556027c96d9cb569bf50ae889fd148344999 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 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 errors (new ones prefixed by >>): In file included from drivers/net/dsa/mv88e6xxx/chip.c:3164: 52 | static int _mv88e6xxx_pvt_read(struct mv88e6xxx_chip *chip, int src_dev, | ^~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors vim +/_mv88e6xxx_pvt_read +52 drivers/net/dsa/mv88e6xxx/mv88e6xxx_debugfs.c fe8a2a1725d821 Vivien Didelot 2015-10-22 51 fe8a2a1725d821 Vivien Didelot 2015-10-22 @52 static int _mv88e6xxx_pvt_read(struct mv88e6xxx_chip *chip, int src_dev, fe8a2a1725d821 Vivien Didelot 2015-10-22 53 int src_port, u16 *data) fe8a2a1725d821 Vivien Didelot 2015-10-22 54 { fe8a2a1725d821 Vivien Didelot 2015-10-22 55 int ret; fe8a2a1725d821 Vivien Didelot 2015-10-22 56 fe8a2a1725d821 Vivien Didelot 2015-10-22 57 ret = _mv88e6xxx_pvt_wait(chip); fe8a2a1725d821 Vivien Didelot 2015-10-22 58 if (ret < 0) fe8a2a1725d821 Vivien Didelot 2015-10-22 59 return ret; fe8a2a1725d821 Vivien Didelot 2015-10-22 60 fe8a2a1725d821 Vivien Didelot 2015-10-22 61 ret = _mv88e6xxx_pvt_cmd(chip, src_dev, src_port, fe8a2a1725d821 Vivien Didelot 2015-10-22 62 GLOBAL2_PVT_ADDR_OP_READ); fe8a2a1725d821 Vivien Didelot 2015-10-22 63 if (ret < 0) fe8a2a1725d821 Vivien Didelot 2015-10-22 64 return ret; fe8a2a1725d821 Vivien Didelot 2015-10-22 65 fe8a2a1725d821 Vivien Didelot 2015-10-22 66 return mv88e6xxx_g2_read(chip, GLOBAL2_PVT_DATA, data); fe8a2a1725d821 Vivien Didelot 2015-10-22 67 } fe8a2a1725d821 Vivien Didelot 2015-10-22 68 :::::: The code at line 52 was first introduced by commit :::::: fe8a2a1725d821bb81755cefe6483985aee89fba net: dsa: mv88e6xxx: add debugfs interface :::::: TO: Vivien Didelot <vivien.didelot(a)savoirfairelinux.com&gt; :::::: CC: Russell King (Oracle) <rmk+kernel(a)armlinux.org.uk&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org