netdev - Re: [PATCH bpf-next 01/10] [bpf]: adding bpf_xdp_adjust

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Message-ID: <201804172215.P2KVGMnp%fengguang.wu@intel.com>
Date:   Tue, 17 Apr 2018 22:14:12 +0800
From:   kbuild test robot <lkp@...el.com>
To:     "Nikita V. Shirokov" <tehnerd@...nerd.com>
Cc:     kbuild-all@...org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        "Nikita V. Shirokov" <tehnerd@...nerd.com>
Subject: Re: [PATCH bpf-next 01/10] [bpf]: adding bpf_xdp_adjust_tail helper

Hi Nikita,

Thank you for the patch! Perhaps something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Nikita-V-Shirokov/introduction-of-bpf_xdp_adjust_tail/20180417-211905
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: i386-randconfig-s1-201815 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   net/core/filter.c: In function '____bpf_xdp_adjust_tail':
>> net/core/filter.c:2726:2: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
     void *data_end = xdp->data_end + offset;
     ^~~~

vim +2726 net/core/filter.c

  2719	
  2720	BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset)
  2721	{
  2722		/* only shrinking is allowed for now. */
  2723		if (unlikely(offset > 0))
  2724			return -EINVAL;
  2725	
> 2726		void *data_end = xdp->data_end + offset;
  2727	
  2728		if (unlikely(data_end < xdp->data + ETH_HLEN))
  2729			return -EINVAL;
  2730	
  2731		xdp->data_end = data_end;
  2732	
  2733		return 0;
  2734	}
  2735	

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

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