Hi Dan, I love your patch! Perhaps something to improve: [auto build test WARNING on net-next/master] url: https://github.com/0day-ci/linux/commits/Dan-Murphy/RGMII-Internal-delay-... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git cb8e59cc87201af93dfbb6c3dccc8fcad72a09c2 config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 487ca07fcc75d52755c9fe2ee05bcb3b6eeeec44) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>, old ones prefixed by <<): if (rx_int_delay <= 0) ^~~~~~~~~~~~~~~~~ drivers/net/phy/dp83822.c:296:7: note: uninitialized use occurs here if (rgmii_delay) { ^~~~~~~~~~~ drivers/net/phy/dp83822.c:284:3: note: remove the 'if' if its condition is always false if (rx_int_delay <= 0) ^~~~~~~~~~~~~~~~~~~~~~ drivers/net/phy/dp83822.c:276:17: note: initialize the variable 'rgmii_delay' to silence this warning int rgmii_delay; ^ = 0 1 warning generated. vim +284 drivers/net/phy/dp83822.c 272 273 static int dp83822_config_init(struct phy_device *phydev) 274 { 275 struct device *dev = &phydev->mdio.dev; 276 int rgmii_delay; 277 s32 rx_int_delay; 278 s32 tx_int_delay; 279 int err = 0; 280 281 if (phy_interface_is_rgmii(phydev)) { 282 rx_int_delay = phy_get_internal_delay(phydev, dev, NULL, 0, 283 true); 285 rx_int_delay = 0; 286 else 287 rgmii_delay = DP83822_RX_CLK_SHIFT; 288 289 tx_int_delay = phy_get_internal_delay(phydev, dev, NULL, 0, 290 false); 291 if (tx_int_delay <= 0) 292 tx_int_delay = 0; 293 else 294 rgmii_delay |= DP83822_TX_CLK_SHIFT; 295 296 if (rgmii_delay) { 297 err = phy_set_bits_mmd(phydev, DP83822_DEVADDR, 298 MII_DP83822_RCSR, rgmii_delay); 299 if (err) 300 return err; 301 } 302 } 303 304 return dp8382x_disable_wol(phydev); 305 } 306 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org