[kbuild-all] [jkirsher-next-queue:dev-queue 7/115] drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8157:14: warning: division by zero is undefined

tree: https://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue.git dev-queue head: 1ae51690bc317eb011c6fcc8f5549b151b347167 commit: cc703d543a3b97138318bfe7d3c86cbf78136395 [7/115] ixgbe: fix XDP redirect on archs with PAGE_SIZE above 4K config: arm64-randconfig-r025-20200515 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project b31cb3aa5ee7ea92d830b06a0a7e42c7f2791dd4) reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu git checkout cc703d543a3b97138318bfe7d3c86cbf78136395 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:2271:15: error: redefinition of 'truesize' unsigned int truesize = ring_uses_build_skb(rx_ring) ? ^ drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:2267:15: note: previous definition is here unsigned int truesize = ixgbe_rx_frame_truesize(rx_ring, size); ^ cmd_type |= IXGBE_SET_FLAG(tx_flags, IXGBE_TX_FLAGS_HW_VLAN, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8147:26: note: expanded from macro 'IXGBE_SET_FLAG' ((u32)(_input & _flag) / (_flag / _result))) ^ ~~~~~~~~~~~~~~~~~ drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8161:14: warning: division by zero is undefined [-Wdivision-by-zero] cmd_type |= IXGBE_SET_FLAG(tx_flags, IXGBE_TX_FLAGS_TSO, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8147:26: note: expanded from macro 'IXGBE_SET_FLAG' ((u32)(_input & _flag) / (_flag / _result))) ^ ~~~~~~~~~~~~~~~~~ drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8165:14: warning: division by zero is undefined [-Wdivision-by-zero] cmd_type |= IXGBE_SET_FLAG(tx_flags, IXGBE_TX_FLAGS_TSTAMP, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8147:26: note: expanded from macro 'IXGBE_SET_FLAG' ((u32)(_input & _flag) / (_flag / _result))) ^ ~~~~~~~~~~~~~~~~~ drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8169:14: warning: division by zero is undefined [-Wdivision-by-zero] cmd_type ^= IXGBE_SET_FLAG(skb->no_fcs, 1, IXGBE_ADVTXD_DCMD_IFCS); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8147:26: note: expanded from macro 'IXGBE_SET_FLAG' ((u32)(_input & _flag) / (_flag / _result))) ^ ~~~~~~~~~~~~~~~~~ drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8180:19: warning: division by zero is undefined [-Wdivision-by-zero] olinfo_status |= IXGBE_SET_FLAG(tx_flags, ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8147:26: note: expanded from macro 'IXGBE_SET_FLAG' ((u32)(_input & _flag) / (_flag / _result))) ^ ~~~~~~~~~~~~~~~~~ drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8185:19: warning: division by zero is undefined [-Wdivision-by-zero] olinfo_status |= IXGBE_SET_FLAG(tx_flags, ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8147:26: note: expanded from macro 'IXGBE_SET_FLAG' ((u32)(_input & _flag) / (_flag / _result))) ^ ~~~~~~~~~~~~~~~~~ drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8190:19: warning: division by zero is undefined [-Wdivision-by-zero] olinfo_status |= IXGBE_SET_FLAG(tx_flags, ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8147:26: note: expanded from macro 'IXGBE_SET_FLAG' ((u32)(_input & _flag) / (_flag / _result))) ^ ~~~~~~~~~~~~~~~~~ drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8198:19: warning: division by zero is undefined [-Wdivision-by-zero] olinfo_status |= IXGBE_SET_FLAG(tx_flags, ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8147:26: note: expanded from macro 'IXGBE_SET_FLAG' ((u32)(_input & _flag) / (_flag / _result))) ^ ~~~~~~~~~~~~~~~~~ if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) { ^~~~~~~~~~~~~~~~ include/linux/dma-mapping.h:139:54: note: expanded from macro 'DMA_BIT_MASK' #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) ^ ~~~ 9 warnings and 1 error generated. vim +8157 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c 9a799d71034c4e2 drivers/net/ixgbe/ixgbe_main.c Auke Kok 2007-09-15 8143 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8144 #define IXGBE_SET_FLAG(_input, _flag, _result) \ 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8145 ((_flag <= _result) ? \ 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8146 ((u32)(_input & _flag) * (_result / _flag)) : \ 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8147 ((u32)(_input & _flag) / (_flag / _result))) 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8148 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8149 static u32 ixgbe_tx_cmd_type(struct sk_buff *skb, u32 tx_flags) 9a799d71034c4e2 drivers/net/ixgbe/ixgbe_main.c Auke Kok 2007-09-15 8150 { d3d0023979c87ee drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2011-07-15 8151 /* set type for advanced descriptor with frame checksum insertion */ 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8152 u32 cmd_type = IXGBE_ADVTXD_DTYP_DATA | 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8153 IXGBE_ADVTXD_DCMD_DEXT | 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8154 IXGBE_ADVTXD_DCMD_IFCS; 9a799d71034c4e2 drivers/net/ixgbe/ixgbe_main.c Auke Kok 2007-09-15 8155 d3d0023979c87ee drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2011-07-15 8156 /* set HW vlan bit if vlan is present */ 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 @8157 cmd_type |= IXGBE_SET_FLAG(tx_flags, IXGBE_TX_FLAGS_HW_VLAN, 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8158 IXGBE_ADVTXD_DCMD_VLE); 3a6a4edaa59273f drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Jacob Keller 2012-05-01 8159 d3d0023979c87ee drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2011-07-15 8160 /* set segmentation enable bits for TSO/FSO */ 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8161 cmd_type |= IXGBE_SET_FLAG(tx_flags, IXGBE_TX_FLAGS_TSO, 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8162 IXGBE_ADVTXD_DCMD_TSE); 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8163 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8164 /* set timestamp bit if present */ 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8165 cmd_type |= IXGBE_SET_FLAG(tx_flags, IXGBE_TX_FLAGS_TSTAMP, 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8166 IXGBE_ADVTXD_MAC_TSTAMP); 9a799d71034c4e2 drivers/net/ixgbe/ixgbe_main.c Auke Kok 2007-09-15 8167 62748b7bde84618 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-07-20 8168 /* insert frame checksum */ 472148c320c0d11 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-11-07 8169 cmd_type ^= IXGBE_SET_FLAG(skb->no_fcs, 1, IXGBE_ADVTXD_DCMD_IFCS); 62748b7bde84618 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2012-07-20 8170 d3d0023979c87ee drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2011-07-15 8171 return cmd_type; d3d0023979c87ee drivers/net/ethernet/intel/ixgbe/ixgbe_main.c Alexander Duyck 2011-07-15 8172 } 9a799d71034c4e2 drivers/net/ixgbe/ixgbe_main.c Auke Kok 2007-09-15 8173 :::::: The code at line 8157 was first introduced by commit :::::: 472148c320c0d11245932ba1315bc4ec0667ed57 ixgbe: Update ixgbe Tx flags to improve code efficiency :::::: TO: Alexander Duyck <alexander.h.duyck(a)intel.com&gt; :::::: CC: Jeff Kirsher <jeffrey.t.kirsher(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org