[kbuild-all] [rmk-arm:zii 88/102] drivers/net/dsa/mv88e6xxx/serdes-6352.c:116:6: error: variable 'err' is used uninitialized whenever 'if' condition is false

tree: git://git.armlinux.org.uk/~rmk/linux-arm zii head: 2f38af1897a020adf10ab01d8dc20ea8388b564d commit: b53990e2eebb53cba059843e3c6e93b3b0c10c59 [88/102] net: dsa: mv88e6xxx: convert 88e6352 to phylink_pcs *EXPERIMENTAL* config: arm-buildonly-randconfig-r002-20211112 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c3dddeeafb529e769cde87bd29ef6271ac6bfa5c) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi git remote add rmk-arm git://git.armlinux.org.uk/~rmk/linux-arm git fetch --no-tags rmk-arm zii git checkout b53990e2eebb53cba059843e3c6e93b3b0c10c59 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm 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 >>): if (oldpage >= 0) ^~~~~~~~~~~~ drivers/net/dsa/mv88e6xxx/serdes-6352.c:120:53: note: uninitialized use occurs here return marvell_c22_pcs_restore_page(mpcs, oldpage, err); ^~~ drivers/net/dsa/mv88e6xxx/serdes-6352.c:116:2: note: remove the 'if' if its condition is always true if (oldpage >= 0) ^~~~~~~~~~~~~~~~~ drivers/net/dsa/mv88e6xxx/serdes-6352.c:113:18: note: initialize the variable 'err' to silence this warning int oldpage, err; ^ = 0 drivers/net/dsa/mv88e6xxx/serdes-6352.c:189:6: error: variable 'err' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized] if (oldpage >= 0) ^~~~~~~~~~~~ drivers/net/dsa/mv88e6xxx/serdes-6352.c:193:53: note: uninitialized use occurs here return marvell_c22_pcs_restore_page(mpcs, oldpage, err); ^~~ drivers/net/dsa/mv88e6xxx/serdes-6352.c:189:2: note: remove the 'if' if its condition is always true if (oldpage >= 0) ^~~~~~~~~~~~~~~~~ drivers/net/dsa/mv88e6xxx/serdes-6352.c:182:23: note: initialize the variable 'err' to silence this warning int oldpage, adv, err; ^ = 0 2 errors generated. vim +116 drivers/net/dsa/mv88e6xxx/serdes-6352.c 109 110 static int marvell_c22_pcs_modify(struct marvell_c22_pcs *mpcs, u8 reg, 111 u16 mask, u16 val) 112 { 113 int oldpage, err; 114 115 oldpage = marvell_c22_pcs_set_fiber_page(mpcs); 117 err = __mdiobus_modify(mpcs->mdio.bus, mpcs->mdio.addr, 118 reg, mask, val); 119 120 return marvell_c22_pcs_restore_page(mpcs, oldpage, err); 121 } 122 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org