Hi Thiago,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.15-rc1 next-20171201]
[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/Thiago-Rafael-Becker/kernel-Move-groups_sort-to-the-caller-of-set_groups/20171203-191757
config: x86_64-randconfig-x011-201749 (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=x86_64 

All errors (new ones prefixed by >>):

   kernel/uid16.c: In function 'SYSC_setgroups16':
>> kernel/uid16.c:195:2: error: implicit declaration of function 'groups_sort'; did you mean 'cgroup_fork'? [-Werror=implicit-function-declaration]
     groups_sort(group_info);
     ^~~~~~~~~~~
     cgroup_fork
   cc1: some warnings being treated as errors

vim +195 kernel/uid16.c

   175	
   176	SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
   177	{
   178		struct group_info *group_info;
   179		int retval;
   180	
   181		if (!may_setgroups())
   182			return -EPERM;
   183		if ((unsigned)gidsetsize > NGROUPS_MAX)
   184			return -EINVAL;
   185	
   186		group_info = groups_alloc(gidsetsize);
   187		if (!group_info)
   188			return -ENOMEM;
   189		retval = groups16_from_user(group_info, grouplist);
   190		if (retval) {
   191			put_group_info(group_info);
   192			return retval;
   193		}
   194	
 > 195		groups_sort(group_info);
   196		retval = set_current_groups(group_info);
   197		put_group_info(group_info);
   198	
   199		return retval;
   200	}
   201	

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