tree: https://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue.git dev-queue head: 5950d1e508b225372208a78339e6434adf129852 commit: 8c7bd5a454ffc2b0518d1499c4af95f00291d2af [1768/1945] net: ethernet: mtk-star-emac: new driver config: arm-allyesconfig (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 git checkout 8c7bd5a454ffc2b0518d1499c4af95f00291d2af # 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: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): drivers/net/ethernet/mediatek/mtk_star_emac.c: In function 'mtk_star_ring_free_skbs': 749 | struct mtk_star_ring_desc *desc; | ^~~~ vim +/desc +749 drivers/net/ethernet/mediatek/mtk_star_emac.c 742 743 static void 744 mtk_star_ring_free_skbs(struct mtk_star_priv *priv, struct mtk_star_ring *ring, 745 void (*unmap_func)(struct mtk_star_priv *, 746 struct mtk_star_ring_desc_data *)) 747 { 748 struct mtk_star_ring_desc_data desc_data; 750 int i; 751 752 for (i = 0; i < MTK_STAR_RING_NUM_DESCS; i++) { 753 if (!ring->dma_addrs[i]) 754 continue; 755 756 desc = &ring->descs[i]; 757 758 desc_data.dma_addr = ring->dma_addrs[i]; 759 desc_data.skb = ring->skbs[i]; 760 761 unmap_func(priv, &desc_data); 762 dev_kfree_skb(desc_data.skb); 763 } 764 } 765 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org