netdev - Re: [PATCH net-next 3/4] net: warn if transport header was not set

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Date:   Mon, 9 May 2022 16:52:17 -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>
Subject: Re: [PATCH net-next 3/4] net: warn if transport header was not set

On Mon, May 9, 2022 at 4:32 PM kernel test robot <lkp@...el.com> wrote:
>
> Hi Eric,
>
> I love your patch! Perhaps something to improve:
>
> [auto build test WARNING on net-next/master]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Eric-Dumazet/net-CONFIG_DEBUG_NET-and-friends/20220510-031145
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 9c095bd0d4c451d31d0fd1131cc09d3b60de815d
> config: arm-oxnas_v6_defconfig (https://download.01.org/0day-ci/archive/20220510/202205100723.9Wqso3nI-lkp@intel.com/config)
> compiler: arm-linux-gnueabi-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/d316b61f313a417d7dfa97fa006320288f3af150
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review Eric-Dumazet/net-CONFIG_DEBUG_NET-and-friends/20220510-031145
>         git checkout d316b61f313a417d7dfa97fa006320288f3af150
>         # 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=arm SHELL=/bin/bash drivers/net/ethernet/stmicro/stmmac/ drivers/net/mdio/ net/core/
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>

I suppose some compiler/arches are asking us to add forward
declaration for struct net_device.
I have no idea what is the justification for that.