netdev - Re: [PATCH net 1/2] net: add debug info to __skb

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Message-ID: <CANn89i+dz7NiTOJP4uyq2qCsj-_E=qbXBBKZ819pgMzd6TbMBA@mail.gmail.com>
Date:   Wed, 1 Jun 2022 10:26:07 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     kernel test robot <lkp@...el.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, kbuild-all@...ts.01.org,
        netdev <netdev@...r.kernel.org>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net 1/2] net: add debug info to __skb_pull()

On Wed, Jun 1, 2022 at 12:28 AM kernel test robot <lkp@...el.com> wrote:
>
> 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 <lkp@...el.com>
>
> 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'
> >> arc-elf-ld: include/linux/skbuff.h:2703: undefined reference to `skb_dump'
>


So... CONFIG_NET=n  and yet __cgroup_bpf_run_filter_skb() is using skbs ?

Not sure if this makes any sense.



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