linux-kernel - Re: [PATCH net-next v4 1/2] New kernel function to get IP overhead on a socket.

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Date:   Fri, 24 Mar 2017 09:04:30 +0800
From:   kbuild test robot <lkp@...el.com>
To:     "R. Parameswaran" <parameswaran.r7@...il.com>
Cc:     kbuild-all@...org, netdev@...r.kernel.org, kleptog@...na.org,
        jchapman@...alix.com, davem@...hat.com, nprachan@...cade.com,
        rshearma@...cade.com, stephen@...workplumber.org,
        sdietric@...cade.com, ciwillia@...cade.com, lboccass@...cade.com,
        dfawcus@...cade.com, bhong@...cade.com, jblunck@...cade.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v4 1/2] New kernel function to get IP overhead
 on a socket.

Hi Parameswaran,

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

url:    https://github.com/0day-ci/linux/commits/R-Parameswaran/New-kernel-function-to-get-IP-overhead-on-a-socket/20170324-065003
config: x86_64-randconfig-s1-03240701 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   net/socket.c: In function 'kernel_sock_ip_overhead':
>> net/socket.c:3359: warning: unused variable 'optv6'
>> net/socket.c:3357: warning: unused variable 'np'

vim +/optv6 +3359 net/socket.c

  3351	 * this is an IPv4 or IPv6 socket and the length from IP options turned
  3352	 * on at the socket.
  3353	 */
  3354	u32 kernel_sock_ip_overhead(struct sock *sk)
  3355	{
  3356		struct inet_sock *inet;
> 3357		struct ipv6_pinfo *np;
  3358		struct ip_options_rcu *opt;
> 3359		struct ipv6_txoptions *optv6 = NULL;
  3360		u32 overhead = 0;
  3361		bool owned_by_user;
  3362	

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

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