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

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Date:   Mon, 1 Jan 2018 11:48:11 +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
config: i386-randconfig-x072-201800 (attached as .config)
compiler: gcc-7 (Debian 7.2.0-12) 7.2.1 20171025
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   drivers//net/tun.c: In function 'tun_xdp_to_ptr':
>> drivers//net/tun.c:251:9: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
     return (void *)((unsigned long)ptr | TUN_XDP_FLAG);
            ^
   drivers//net/tun.c: In function 'tun_ptr_to_xdp':
   drivers//net/tun.c:257:9: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
     return (void *)((unsigned long)ptr & ~TUN_XDP_FLAG);
            ^

vim +251 drivers//net/tun.c

   248	
   249	void *tun_xdp_to_ptr(void *ptr)
   250	{
 > 251		return (void *)((unsigned long)ptr | TUN_XDP_FLAG);
   252	}
   253	EXPORT_SYMBOL(tun_xdp_to_ptr);
   254	

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0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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