Hi Eric,

I love your patch! Yet something to improve:

[auto build test ERROR on net/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Eric-Dumazet/net-af_packet-be-careful-when-expanding-mac-header-size/20220601-030146
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git 09e545f7381459c015b6fa0cd0ac6f010ef8cc25
config: arc-randconfig-r021-20220531 (https://download.01.org/0day-ci/archive/20220601/202206011509.Rpp82wrl-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 11.3.0
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-lab-lkp/linux/commit/a907c048e7699133feedaa06948c15c719a59f94
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Eric-Dumazet/net-af_packet-be-careful-when-expanding-mac-header-size/20220601-030146
        git checkout a907c048e7699133feedaa06948c15c719a59f94
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <redacted>

All errors (new ones prefixed by >>):

   arc-elf-ld: kernel/bpf/cgroup.o: in function `__skb_pull':
   include/linux/skbuff.h:2703: undefined reference to `skb_dump'

quoted

arc-elf-ld: include/linux/skbuff.h:2703: undefined reference to `skb_dump'

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp