arch/um/drivers/pcap_kern.c:18:6: warning: no previous prototype for 'pcap_init_kern'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   40f71e7cd3c6ac04293556ab0504a372393838ff
commit: 2c4d3841a82b88ae8a7b518dc6206f84f68e705a um: Avoid pcap multiple definition errors
date:   4 months ago
config: um-randconfig-r036-20230616 (https://download.01.org/0day-ci/archive/20230616/202306162327.v3SoLRFC-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230616/202306162327.v3SoLRFC-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306162327.v3SoLRFC-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> arch/um/drivers/pcap_kern.c:18:6: warning: no previous prototype for 'pcap_init_kern' [-Wmissing-prototypes]
      18 | void pcap_init_kern(struct net_device *dev, void *data)
         |      ^~~~~~~~~~~~~~
   arch/um/drivers/pcap_kern.c:53:5: warning: no previous prototype for 'pcap_setup' [-Wmissing-prototypes]
      53 | int pcap_setup(char *str, char **mac_out, void *data)
         |     ^~~~~~~~~~


vim +/pcap_init_kern +18 arch/um/drivers/pcap_kern.c

    17	
  > 18	void pcap_init_kern(struct net_device *dev, void *data)
    19	{
    20		struct uml_net_private *pri;
    21		struct pcap_data *ppri;
    22		struct pcap_init *init = data;
    23	
    24		pri = netdev_priv(dev);
    25		ppri = (struct pcap_data *) pri->user;
    26		ppri->host_if = init->host_if;
    27		ppri->promisc = init->promisc;
    28		ppri->optimize = init->optimize;
    29		ppri->filter = init->filter;
    30	
    31		printk("pcap backend, host interface %s\n", ppri->host_if);
    32	}
    33	

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