netdev - Re: [PATCH net-next 2/2] tuntap: XDP transmission

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Date:   Mon, 1 Jan 2018 16:27:35 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     kbuild-all@...org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, mst@...hat.com, jbrouer@...hat.com,
        Jason Wang <jasowang@...hat.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>
Subject: Re: [PATCH net-next 2/2] tuntap: XDP transmission

Hi Jason,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Jason-Wang/XDP-transmission-for-tuntap/20180101-105946
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)


vim +1274 drivers/net/tun.c

  1270	
  1271	static void tun_xdp_flush(struct net_device *dev)
  1272	{
  1273		struct tun_struct *tun = netdev_priv(dev);
> 1274		struct tun_file *tfile = tun->tfiles[0];
  1275	
  1276		/* Notify and wake up reader process */
  1277		if (tfile->flags & TUN_FASYNC)
  1278			kill_fasync(&tfile->fasync, SIGIO, POLL_IN);
  1279		tfile->socket.sk->sk_data_ready(tfile->socket.sk);
  1280	}
  1281	

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