linux-kernel - [ammarfaizi2-block:stable/linux-stable-rc/queue/5.10 106/119] net/core/dev_ioctl.c:41:13: warning: unused variable 'i'

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Date:   Sun, 25 Sep 2022 12:59:27 +0800
From:   kernel test robot <lkp@...el.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     kbuild-all@...ts.01.org, Ammar Faizi <ammarfaizi2@...weeb.org>,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org, Sasha Levin <sashal@...nel.org>,
        Christoph Hellwig <hch@....de>
Subject: [ammarfaizi2-block:stable/linux-stable-rc/queue/5.10 106/119]
 net/core/dev_ioctl.c:41:13: warning: unused variable 'i'

tree:   https://github.com/ammarfaizi2/linux-block stable/linux-stable-rc/queue/5.10
head:   0ed01873ed141e2095cc1e0545ab5a54a55c99a6
commit: 41ecdcac6be18abe4e5a75e5925f5a4f6d3e508c [106/119] net: socket: remove register_gifconf
config: i386-randconfig-a001
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/ammarfaizi2/linux-block/commit/41ecdcac6be18abe4e5a75e5925f5a4f6d3e508c
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block stable/linux-stable-rc/queue/5.10
        git checkout 41ecdcac6be18abe4e5a75e5925f5a4f6d3e508c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash net/core/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   net/core/dev_ioctl.c: In function 'dev_ifconf':
>> net/core/dev_ioctl.c:41:13: warning: unused variable 'i' [-Wunused-variable]
      41 |         int i;
         |             ^


vim +/i +41 net/core/dev_ioctl.c

96b45cbd956ce8 Cong Wang     2013-02-15  28  
96b45cbd956ce8 Cong Wang     2013-02-15  29  /*
96b45cbd956ce8 Cong Wang     2013-02-15  30   *	Perform a SIOCGIFCONF call. This structure will change
96b45cbd956ce8 Cong Wang     2013-02-15  31   *	size eventually, and there is nothing I can do about it.
96b45cbd956ce8 Cong Wang     2013-02-15  32   *	Thus we will need a 'compatibility mode'.
96b45cbd956ce8 Cong Wang     2013-02-15  33   */
96b45cbd956ce8 Cong Wang     2013-02-15  34  
36fd633ec98acd Al Viro       2017-06-26  35  int dev_ifconf(struct net *net, struct ifconf *ifc, int size)
96b45cbd956ce8 Cong Wang     2013-02-15  36  {
96b45cbd956ce8 Cong Wang     2013-02-15  37  	struct net_device *dev;
96b45cbd956ce8 Cong Wang     2013-02-15  38  	char __user *pos;
96b45cbd956ce8 Cong Wang     2013-02-15  39  	int len;
96b45cbd956ce8 Cong Wang     2013-02-15  40  	int total;
96b45cbd956ce8 Cong Wang     2013-02-15 @41  	int i;
96b45cbd956ce8 Cong Wang     2013-02-15  42  
96b45cbd956ce8 Cong Wang     2013-02-15  43  	/*
96b45cbd956ce8 Cong Wang     2013-02-15  44  	 *	Fetch the caller's info block.
96b45cbd956ce8 Cong Wang     2013-02-15  45  	 */
96b45cbd956ce8 Cong Wang     2013-02-15  46  
36fd633ec98acd Al Viro       2017-06-26  47  	pos = ifc->ifc_buf;
36fd633ec98acd Al Viro       2017-06-26  48  	len = ifc->ifc_len;
96b45cbd956ce8 Cong Wang     2013-02-15  49  
96b45cbd956ce8 Cong Wang     2013-02-15  50  	/*
96b45cbd956ce8 Cong Wang     2013-02-15  51  	 *	Loop over the interfaces, and write an info block for each.
96b45cbd956ce8 Cong Wang     2013-02-15  52  	 */
96b45cbd956ce8 Cong Wang     2013-02-15  53  
96b45cbd956ce8 Cong Wang     2013-02-15  54  	total = 0;
96b45cbd956ce8 Cong Wang     2013-02-15  55  	for_each_netdev(net, dev) {
96b45cbd956ce8 Cong Wang     2013-02-15  56  		int done;
96b45cbd956ce8 Cong Wang     2013-02-15  57  		if (!pos)
41ecdcac6be18a Arnd Bergmann 2021-07-22  58  			done = inet_gifconf(dev, NULL, 0, size);
96b45cbd956ce8 Cong Wang     2013-02-15  59  		else
41ecdcac6be18a Arnd Bergmann 2021-07-22  60  			done = inet_gifconf(dev, pos + total,
36fd633ec98acd Al Viro       2017-06-26  61  					    len - total, size);
96b45cbd956ce8 Cong Wang     2013-02-15  62  		if (done < 0)
96b45cbd956ce8 Cong Wang     2013-02-15  63  			return -EFAULT;
96b45cbd956ce8 Cong Wang     2013-02-15  64  		total += done;
96b45cbd956ce8 Cong Wang     2013-02-15  65  	}
96b45cbd956ce8 Cong Wang     2013-02-15  66  
96b45cbd956ce8 Cong Wang     2013-02-15  67  	/*
96b45cbd956ce8 Cong Wang     2013-02-15  68  	 *	All done.  Write the updated control block back to the caller.
96b45cbd956ce8 Cong Wang     2013-02-15  69  	 */
36fd633ec98acd Al Viro       2017-06-26  70  	ifc->ifc_len = total;
96b45cbd956ce8 Cong Wang     2013-02-15  71  
96b45cbd956ce8 Cong Wang     2013-02-15  72  	/*
96b45cbd956ce8 Cong Wang     2013-02-15  73  	 * 	Both BSD and Solaris return 0 here, so we do too.
96b45cbd956ce8 Cong Wang     2013-02-15  74  	 */
36fd633ec98acd Al Viro       2017-06-26  75  	return 0;
96b45cbd956ce8 Cong Wang     2013-02-15  76  }
96b45cbd956ce8 Cong Wang     2013-02-15  77  

:::::: The code at line 41 was first introduced by commit
:::::: 96b45cbd956ce83908378d87d009b05645353f22 net: move ioctl functions into a separated file

:::::: TO: Cong Wang <xiyou.wangcong@...il.com>
:::::: CC: David S. Miller <davem@...emloft.net>

-- 
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