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Sat, 12 Mar 2022 16:11:31 +0000 Date: Sun, 13 Mar 2022 00:11:01 +0800 From: kernel test robot To: "Russell King (Oracle)" Cc: llvm@lists.linux.dev, kbuild-all@lists.01.org, linux-kernel@vger.kernel.org Subject: [rmk-arm:zii 128/199] drivers/net/dsa/mv88e6xxx/serdes.c:1343:3: warning: variable 'reg' is uninitialized when used here Message-ID: <202203130000.24KypUX4-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org tree: git://git.armlinux.org.uk/~rmk/linux-arm zii head: 22f6fd6865d54d3632278e7f17bad52308e50311 commit: b222c2366f2aacc7b0b55d6fa78e903293aa9eaa [128/199] net: dsa: mv88e6xxx: provide and use mv88e6390_serdes_modify() config: i386-randconfig-a013 (https://download.01.org/0day-ci/archive/20220313/202203130000.24KypUX4-lkp@intel.com/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 43f668b98e8d87290fc6bbf5ed13c3ab542e3497) 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 rmk-arm git://git.armlinux.org.uk/~rmk/linux-arm git fetch --no-tags rmk-arm zii git checkout b222c2366f2aacc7b0b55d6fa78e903293aa9eaa # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/net/dsa/mv88e6xxx/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> drivers/net/dsa/mv88e6xxx/serdes.c:1343:3: warning: variable 'reg' is uninitialized when used here [-Wuninitialized] reg |= MV88E6393X_SERDES_CTRL1_TX_PDOWN | ^~~ drivers/net/dsa/mv88e6xxx/serdes.c:1338:9: note: initialize the variable 'reg' to silence this warning u16 reg; ^ = 0 1 warning generated. vim +/reg +1343 drivers/net/dsa/mv88e6xxx/serdes.c de776d0d316f72 Pavana Sharma 2021-03-17 1334 7527d66260ac0c Marek Behún 2021-11-30 1335 static int mv88e6393x_serdes_power_lane(struct mv88e6xxx_chip *chip, int lane, 7527d66260ac0c Marek Behún 2021-11-30 1336 bool on) 7527d66260ac0c Marek Behún 2021-11-30 1337 { 7527d66260ac0c Marek Behún 2021-11-30 1338 u16 reg; 7527d66260ac0c Marek Behún 2021-11-30 1339 7527d66260ac0c Marek Behún 2021-11-30 1340 if (on) b222c2366f2aac Russell King (Oracle 2022-03-08 1341) reg = 0; 7527d66260ac0c Marek Behún 2021-11-30 1342 else 7527d66260ac0c Marek Behún 2021-11-30 @1343 reg |= MV88E6393X_SERDES_CTRL1_TX_PDOWN | 7527d66260ac0c Marek Behún 2021-11-30 1344 MV88E6393X_SERDES_CTRL1_RX_PDOWN; 7527d66260ac0c Marek Behún 2021-11-30 1345 b222c2366f2aac Russell King (Oracle 2022-03-08 1346) return mv88e6390_serdes_modify(chip, lane, MDIO_MMD_PHYXS, b222c2366f2aac Russell King (Oracle 2022-03-08 1347) MV88E6393X_SERDES_CTRL1, b222c2366f2aac Russell King (Oracle 2022-03-08 1348) MV88E6393X_SERDES_CTRL1_TX_PDOWN | b222c2366f2aac Russell King (Oracle 2022-03-08 1349) MV88E6393X_SERDES_CTRL1_RX_PDOWN, reg); 7527d66260ac0c Marek Behún 2021-11-30 1350 } 7527d66260ac0c Marek Behún 2021-11-30 1351 :::::: The code at line 1343 was first introduced by commit :::::: 7527d66260ac0c603c6baca5146748061fcddbd6 net: dsa: mv88e6xxx: Save power by disabling SerDes trasmitter and receiver :::::: TO: Marek Behún :::::: CC: David S. Miller --- 0-DAY CI Kernel Test Service https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org