tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: eeb611e5394c56d45c5cc8f7dc484c9f19e93143 commit: fabf035bcf07c8de58a4194b9440b566033892bb [972/1142] net: stmmac: add stmmac_all_queue_pairs_enable|disable() for XDP setup 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/fabf035bcf07c8de58a4194b9... 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 fabf035bcf07c8de58a4194b9440b566033892bb # 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:848:3: 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:674:2: 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:853:33: note: uninitialized use occurs here temp = div_u64(1000000000ULL, sec_inc); ^~~~~~~ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:848:3: note: remove the 'if' if its condition is always true stmmac_config_sub_second_increment(priv, ^ drivers/net/ethernet/stmicro/stmmac/hwif.h:674:2: 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:848:3: 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:674:2: 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:853:33: note: uninitialized use occurs here temp = div_u64(1000000000ULL, sec_inc); ^~~~~~~ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:848:3: note: remove the '&&' if its condition is always true stmmac_config_sub_second_increment(priv, ^ drivers/net/ethernet/stmicro/stmmac/hwif.h:674:2: 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:813:13: note: initialize the variable 'sec_inc' to silence this warning u32 sec_inc; ^ = 0 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:1462:6: 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:1462:1: 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 int stmmac_all_queue_pairs_enable(struct stmmac_priv *priv) ^ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:5760:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int stmmac_all_queue_pairs_enable(struct stmmac_priv *priv) ^ static int stmmac_all_queue_pairs_disable(struct stmmac_priv *priv) ^ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:5814:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int stmmac_all_queue_pairs_disable(struct stmmac_priv *priv) ^ static drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:5837:5: 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:5837:1: 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 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:6552:6: warning: no previous prototype for function 'stmmac_clean_all_tx_rings' [-Wmissing-prototypes] void stmmac_clean_all_tx_rings(struct stmmac_priv *priv) ^ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:6552:1: 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:4364:19: warning: unused function 'stmmac_rx_threshold_count' [-Wunused-function] static inline int stmmac_rx_threshold_count(struct stmmac_rx_queue *rx_q) ^ 8 warnings generated. vim +/stmmac_all_queue_pairs_enable +5760 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c 5759 5761 { 5762 int i; 5763 5764 mutex_lock(&priv->lock); 5765 5766 if (stmmac_enabled_xdp(priv)) 5767 priv->plat->normal_tx_queue_count = priv->plat->num_queue_pairs; 5768 else 5769 priv->plat->normal_tx_queue_count = 5770 priv->plat->tx_queues_to_use; 5771 5772 for (i = 0; i < priv->plat->num_queue_pairs; i++) { 5773 int err = stmmac_queue_pair_enable(priv, i); 5774 5775 if (err) 5776 return err; 5777 } 5778 5779 mutex_unlock(&priv->lock); 5780 5781 return 0; 5782 } 5783 5784 /** 5785 * stmmac_queue_pair_disable - Disables a queue pair 5786 * @priv: driver private structure 5787 * @queue_pair: queue pair 5788 * 5789 * Returns 0 on success, <0 on failure. 5790 **/ 5791 int stmmac_queue_pair_disable(struct stmmac_priv *priv, u16 qid) 5792 { 5793 u16 qp_num = priv->plat->num_queue_pairs; 5794 int ret; 5795 5796 if (qid >= qp_num) { 5797 netdev_err(priv->dev, 5798 "%s: qid (%d) > number of queue pairs (%d)\n", 5799 __func__, qid, qp_num); 5800 5801 return -EINVAL; 5802 } 5803 5804 stmmac_napi_control(priv, qid, false); 5805 ret = stmmac_txrx_irq_control(priv, qid, false); 5806 if (ret) 5807 return ret; 5808 stmmac_txrx_dma_control(priv, qid, false); 5809 stmmac_txrx_desc_control(priv, qid, false); 5810 5811 return ret; 5812 } 5813 5815 { 5816 int i; 5817 5818 mutex_lock(&priv->lock); 5819 5820 for (i = 0; i < priv->plat->num_queue_pairs; i++) { 5821 int err = stmmac_queue_pair_disable(priv, i); 5822 5823 if (err) 5824 return err; 5825 } 5826 5827 mutex_unlock(&priv->lock); 5828 5829 return 0; 5830 } 5831 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org