Hi Joakim, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on net-next/master] url: https://github.com/0day-ci/linux/commits/Joakim-Zhang/net-fec-fix-TX-band... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git c7654495916e109f76a67fd3ae68f8fa70ab4faa config: parisc-randconfig-s031-20210618 (attached as .config) compiler: hppa-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-341-g8af24329-dirty # https://github.com/0day-ci/linux/commit/a0ef15273c2798319e07a8277161e99b4... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Joakim-Zhang/net-fec-fix-TX-bandwidth-fluctuations/20210616-221117 git checkout a0ef15273c2798319e07a8277161e99b4a22b41e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=parisc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) vim +3250 drivers/net/ethernet/freescale/fec_main.c 3244 3245 static u16 fec_enet_get_raw_vlan_tci(struct sk_buff *skb) 3246 { 3247 struct vlan_ethhdr *vhdr; 3248 unsigned short vlan_TCI = 0; 3249 3251 vhdr = (struct vlan_ethhdr *)(skb->data); 3252 vlan_TCI = ntohs(vhdr->h_vlan_TCI); 3253 } 3254 3255 return vlan_TCI; 3256 } 3257 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org