tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: be0f563c86400c13b89cfd69a1cd7ca33f21ed54 commit: c2198809408cf67767651a83f3024c6340602479 [6901/12652] net: stmmac: clean all pending Tx buffers during suspend config: x86_64-randconfig-r006-20201111 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 874b0a0b9db93f5d3350ffe6b5efda2d908415d0) 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 # https://github.com/intel/linux-intel-lts/commit/c2198809408cf67767651a83f... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 5.4/yocto git checkout c2198809408cf67767651a83f3024c6340602479 # 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 >>): drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:802:3: warning: variable 'sec_inc' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] stmmac_config_sub_second_increment(priv, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/stmicro/stmmac/hwif.h:666:2: note: expanded from macro 'stmmac_config_sub_second_increment' stmmac_do_void_callback(__priv, ptp, config_sub_second_increment, __args) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/stmicro/stmmac/hwif.h:14:6: note: expanded from macro 'stmmac_do_void_callback' if ((__priv)->hw->__module && (__priv)->hw->__module->__cname) { \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:807:33: note: uninitialized use occurs here temp = div_u64(1000000000ULL, sec_inc); ^~~~~~~ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:802:3: note: remove the 'if' if its condition is always true stmmac_config_sub_second_increment(priv, ^ drivers/net/ethernet/stmicro/stmmac/hwif.h:666:2: note: expanded from macro 'stmmac_config_sub_second_increment' stmmac_do_void_callback(__priv, ptp, config_sub_second_increment, __args) ^ drivers/net/ethernet/stmicro/stmmac/hwif.h:14:2: note: expanded from macro 'stmmac_do_void_callback' if ((__priv)->hw->__module && (__priv)->hw->__module->__cname) { \ ^ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:802:3: warning: variable 'sec_inc' is used uninitialized whenever '&&' condition is false [-Wsometimes-uninitialized] stmmac_config_sub_second_increment(priv, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/stmicro/stmmac/hwif.h:666:2: note: expanded from macro 'stmmac_config_sub_second_increment' stmmac_do_void_callback(__priv, ptp, config_sub_second_increment, __args) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/stmicro/stmmac/hwif.h:14:6: note: expanded from macro 'stmmac_do_void_callback' if ((__priv)->hw->__module && (__priv)->hw->__module->__cname) { \ ^~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:807:33: note: uninitialized use occurs here temp = div_u64(1000000000ULL, sec_inc); ^~~~~~~ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:802:3: note: remove the '&&' if its condition is always true stmmac_config_sub_second_increment(priv, ^ drivers/net/ethernet/stmicro/stmmac/hwif.h:666:2: note: expanded from macro 'stmmac_config_sub_second_increment' stmmac_do_void_callback(__priv, ptp, config_sub_second_increment, __args) ^ drivers/net/ethernet/stmicro/stmmac/hwif.h:14:6: note: expanded from macro 'stmmac_do_void_callback' if ((__priv)->hw->__module && (__priv)->hw->__module->__cname) { \ ^ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:767:13: note: initialize the variable 'sec_inc' to silence this warning u32 sec_inc; ^ = 0 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:1403:6: warning: no previous prototype for function 'stmmac_alloc_rx_buffers' [-Wmissing-prototypes] bool stmmac_alloc_rx_buffers(struct stmmac_rx_queue *rx_q, u32 count) ^ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:1403:1: note: declare 'static' if the function is not intended to be used outside of this translation unit bool stmmac_alloc_rx_buffers(struct stmmac_rx_queue *rx_q, u32 count) ^ static drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:5615:5: warning: no previous prototype for function 'stmmac_xdp_xmit' [-Wmissing-prototypes] int stmmac_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames, ^ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:5615:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int stmmac_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames, ^ static void stmmac_clean_all_tx_rings(struct stmmac_priv *priv) ^ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:6293:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void stmmac_clean_all_tx_rings(struct stmmac_priv *priv) ^ static drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:4232:19: warning: unused function 'stmmac_rx_threshold_count' [-Wunused-function] static inline int stmmac_rx_threshold_count(struct stmmac_rx_queue *rx_q) ^ 6 warnings generated. vim +/stmmac_clean_all_tx_rings +6293 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c 6292 6294 { 6295 u32 tx_count = priv->plat->tx_queues_to_use; 6296 u32 queue; 6297 6298 for (queue = 0; queue < tx_count; queue++) { 6299 struct stmmac_tx_queue *tx_q = get_tx_queue(priv, queue); 6300 6301 stmmac_clean_tx_queue(priv, tx_q); 6302 } 6303 } 6304 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org