Re: [PATCH v4] proc/sysctl: add shared variables for range check

[kbuild test robot]

Hi Matteo,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net/master]
[also build test WARNING on v5.1-rc7]
[cannot apply to next-20190429]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Matteo-Croce/proc-sysctl-add-shared-variables-for-range-check/20190430-065026
config: i386-randconfig-x015-201917 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

   net/mpls/af_mpls.c: In function 'mpls_conf_proc':
>> net/mpls/af_mpls.c:1370:27: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
      struct mpls_dev *mdev = ctl->extra1;
                              ^~~
   net/mpls/af_mpls.c:1372:21: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
      struct net *net = ctl->extra2;
                        ^~~

vim +/const +1370 net/mpls/af_mpls.c

24045a03 David Ahern     2017-02-20  1358  
37bde799 Robert Shearman 2015-04-22  1359  #define MPLS_PERDEV_SYSCTL_OFFSET(field)	\
37bde799 Robert Shearman 2015-04-22  1360  	(&((struct mpls_dev *)0)->field)
37bde799 Robert Shearman 2015-04-22  1361  
24045a03 David Ahern     2017-02-20  1362  static int mpls_conf_proc(struct ctl_table *ctl, int write,
24045a03 David Ahern     2017-02-20  1363  			  void __user *buffer,
24045a03 David Ahern     2017-02-20  1364  			  size_t *lenp, loff_t *ppos)
24045a03 David Ahern     2017-02-20  1365  {
24045a03 David Ahern     2017-02-20  1366  	int oval = *(int *)ctl->data;
24045a03 David Ahern     2017-02-20  1367  	int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
24045a03 David Ahern     2017-02-20  1368  
24045a03 David Ahern     2017-02-20  1369  	if (write) {
24045a03 David Ahern     2017-02-20 @1370  		struct mpls_dev *mdev = ctl->extra1;
24045a03 David Ahern     2017-02-20  1371  		int i = (int *)ctl->data - (int *)mdev;
24045a03 David Ahern     2017-02-20  1372  		struct net *net = ctl->extra2;
24045a03 David Ahern     2017-02-20  1373  		int val = *(int *)ctl->data;
24045a03 David Ahern     2017-02-20  1374  
24045a03 David Ahern     2017-02-20  1375  		if (i == offsetof(struct mpls_dev, input_enabled) &&
24045a03 David Ahern     2017-02-20  1376  		    val != oval) {
823566ae David Ahern     2017-03-28  1377  			mpls_netconf_notify_devconf(net, RTM_NEWNETCONF,
823566ae David Ahern     2017-03-28  1378  						    NETCONFA_INPUT, mdev);
24045a03 David Ahern     2017-02-20  1379  		}
24045a03 David Ahern     2017-02-20  1380  	}
24045a03 David Ahern     2017-02-20  1381  
24045a03 David Ahern     2017-02-20  1382  	return ret;
24045a03 David Ahern     2017-02-20  1383  }
24045a03 David Ahern     2017-02-20  1384  

:::::: The code at line 1370 was first introduced by commit
:::::: 24045a03b8796e3e1ddb370dfe4bc592a9f5f301 net: mpls: Add support for netconf

:::::: TO: David Ahern <dsa@xxxxxxxxxxxxxxxxxxx>
:::::: CC: David S. Miller <davem@xxxxxxxxxxxxx>

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