[kbuild-all] [intel-linux-intel-lts:5.4/yocto 982/1142] drivers/net/ethernet/stmicro/stmmac/stmmac_xsk.c:999:25: warning: variable 'ch' set but not used

tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: eeb611e5394c56d45c5cc8f7dc484c9f19e93143 commit: 4f766df18cbde3e137d265e5ca530a491a9450bf [982/1142] net: stmmac: add need_wakeup support for FILL & TX processing in driver config: arm-randconfig-r034-20201111 (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0 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 # https://github.com/intel/linux-intel-lts/commit/4f766df18cbde3e137d265e5c... 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 4f766df18cbde3e137d265e5ca530a491a9450bf # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 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_xsk.c: In function 'stmmac_xsk_wakeup': 999 | struct stmmac_channel *ch; | ^~ 997 | struct stmmac_rx_queue *rx_q; | ^~~~ vim +/ch +999 drivers/net/ethernet/stmicro/stmmac/stmmac_xsk.c 7544af8bd5bd27b Ong Boon Leong 2019-10-04 984 7544af8bd5bd27b Ong Boon Leong 2019-10-04 985 /** 7544af8bd5bd27b Ong Boon Leong 2019-10-04 986 * stmmac_xsk_wakeup - Implements the ndo_xsk_wakeup 7544af8bd5bd27b Ong Boon Leong 2019-10-04 987 * @dev: the netdevice 7544af8bd5bd27b Ong Boon Leong 2019-10-04 988 * @queue_id: queue id to wake up 7544af8bd5bd27b Ong Boon Leong 2019-10-04 989 * 7544af8bd5bd27b Ong Boon Leong 2019-10-04 990 * Returns <0 for errors, 0 otherwise. 7544af8bd5bd27b Ong Boon Leong 2019-10-04 991 **/ 7544af8bd5bd27b Ong Boon Leong 2019-10-04 992 int stmmac_xsk_wakeup(struct net_device *dev, u32 queue, u32 flags) 7544af8bd5bd27b Ong Boon Leong 2019-10-04 993 { 7544af8bd5bd27b Ong Boon Leong 2019-10-04 994 struct stmmac_priv *priv = netdev_priv(dev); 7544af8bd5bd27b Ong Boon Leong 2019-10-04 995 u16 qp_num = priv->plat->num_queue_pairs; 7544af8bd5bd27b Ong Boon Leong 2019-10-04 996 struct stmmac_tx_queue *xdp_q; 4f766df18cbde3e Ong Boon Leong 2020-05-24 @997 struct stmmac_rx_queue *rx_q; 4f766df18cbde3e Ong Boon Leong 2020-05-24 998 struct stmmac_channel *rx_ch; 7544af8bd5bd27b Ong Boon Leong 2019-10-04 @999 struct stmmac_channel *ch; 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1000 4f766df18cbde3e Ong Boon Leong 2020-05-24 1001 /* queue index is relative to XDP Queue ID. 4f766df18cbde3e Ong Boon Leong 2020-05-24 1002 * XDP Q(N) maps: XDP TXQ[qp+N], SKB TXQ[N] & XDP/SKB RXQ[N] 4f766df18cbde3e Ong Boon Leong 2020-05-24 1003 * where 0 < N < qp_num 4f766df18cbde3e Ong Boon Leong 2020-05-24 1004 */ 4f766df18cbde3e Ong Boon Leong 2020-05-24 1005 xdp_q = get_tx_queue(priv, queue + qp_num); 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1006 ch = &priv->channel[queue + qp_num]; 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1007 4f766df18cbde3e Ong Boon Leong 2020-05-24 1008 rx_q = &priv->rx_queue[queue]; 4f766df18cbde3e Ong Boon Leong 2020-05-24 1009 rx_ch = &priv->channel[queue]; 4f766df18cbde3e Ong Boon Leong 2020-05-24 1010 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1011 if (test_bit(STMMAC_DOWN, &priv->state)) 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1012 return -ENETDOWN; 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1013 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1014 if (!stmmac_enabled_xdp(priv)) 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1015 return -ENXIO; 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1016 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1017 if (queue >= priv->plat->num_queue_pairs) 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1018 return -ENXIO; 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1019 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1020 if (!xdp_q->xsk_umem) 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1021 return -ENXIO; 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1022 4f766df18cbde3e Ong Boon Leong 2020-05-24 1023 if (flags & XDP_WAKEUP_TX) 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1024 stmmac_xmit_zc(xdp_q, priv->dma_tx_size); 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1025 4f766df18cbde3e Ong Boon Leong 2020-05-24 1026 if (flags & XDP_WAKEUP_RX && 4f766df18cbde3e Ong Boon Leong 2020-05-24 1027 !napi_if_scheduled_mark_missed(&rx_ch->rx_napi)) { 4f766df18cbde3e Ong Boon Leong 2020-05-24 1028 if (likely(napi_schedule_prep(&rx_ch->rx_napi))) 4f766df18cbde3e Ong Boon Leong 2020-05-24 1029 __napi_schedule(&rx_ch->rx_napi); 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1030 } 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1031 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1032 return 0; 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1033 } 7544af8bd5bd27b Ong Boon Leong 2019-10-04 1034 :::::: The code at line 999 was first introduced by commit :::::: 7544af8bd5bd27b550fcf305257e2092726cafc5 net: stmmac: add AF_XDP zero-copy Tx support :::::: TO: Ong Boon Leong <boon.leong.ong(a)intel.com&gt; :::::: CC: Voon Weifeng <weifeng.voon(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org