Re: [PATCH RFC net-next] net: cache the __dev_alloc_name()

[kernel test robot <lkp@intel.com>]

Hi William,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build warnings:

[auto build test WARNING on net/main]
[also build test WARNING on linus/master v6.9-rc7]
[cannot apply to net-next/main horms-ipvs/master next-20240508]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/William-Tu/net-cache-the-__dev_alloc_name/20240507-043305
base:   net/main
patch link:    https://lore.kernel.org/r/20240506203207.1307971-1-witu%40nvidia.com
patch subject: [PATCH RFC net-next] net: cache the __dev_alloc_name()
config: alpha-defconfig (https://download.01.org/0day-ci/archive/20240509/202405091354.2Bdd0B0X-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240509/202405091354.2Bdd0B0X-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405091354.2Bdd0B0X-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> net/core/dev.c:295:13: warning: 'netdev_name_pat_in_use' defined but not used [-Wunused-function]
     295 | static bool netdev_name_pat_in_use(struct net *net, const char *pat) // eth%d
         |             ^~~~~~~~~~~~~~~~~~~~~~
>> net/core/dev.c:277:13: warning: 'netdev_name_pat_node_del' defined but not used [-Wunused-function]
     277 | static void netdev_name_pat_node_del(struct netdev_name_pat_node *pat_node)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~
>> net/core/dev.c:264:13: warning: 'netdev_name_pat_node_free' defined but not used [-Wunused-function]
     264 | static void netdev_name_pat_node_free(struct netdev_name_pat_node *pat_node)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~


vim +/netdev_name_pat_in_use +295 net/core/dev.c

   263	
 > 264	static void netdev_name_pat_node_free(struct netdev_name_pat_node *pat_node)
   265	{
   266		bitmap_free(pat_node->inuse);
   267		kfree(pat_node);
   268	}
   269	
   270	static void netdev_name_pat_node_add(struct net *net,
   271					     struct netdev_name_pat_node *pat_node)
   272	{
   273		hlist_add_head(&pat_node->hlist,
   274			       dev_name_pat_hash(net, pat_node->name_pat));
   275	}
   276	
 > 277	static void netdev_name_pat_node_del(struct netdev_name_pat_node *pat_node)
   278	{
   279		hlist_del_rcu(&pat_node->hlist);
   280	}
   281	
   282	static struct netdev_name_pat_node *
   283	netdev_name_pat_node_lookup(struct net *net, const char *pat)
   284	{
   285		struct hlist_head *head = dev_name_pat_hash(net, pat);
   286		struct netdev_name_pat_node *pat_node;
   287	
   288		hlist_for_each_entry(pat_node, head, hlist) {
   289			if (!strcmp(pat_node->name_pat, pat))
   290				return pat_node;
   291		}
   292		return NULL;
   293	}
   294	
 > 295	static bool netdev_name_pat_in_use(struct net *net, const char *pat) // eth%d
   296	{
   297		return netdev_name_pat_node_lookup(net, pat);
   298	}
   299	

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