[mingo-tip:sched/headers 2005/2579] net/ipv6/mcast.c:258:5: warning: no previous prototype for function 'ipv6_sock_mc_join_ssm'

[mingo-tip:sched/headers 2005/2579] net/ipv6/mcast.c:258:5: warning: no previous prototype for function 'ipv6_sock_mc_join_ssm'

[kernel test robot]

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git sched/headers
head:   49e1ec6c70a6eb4b7de9250a455b8b63eb42afbe
commit: c69b0b89e88734be4e9bf8aad8f3fbcbf0b05df9 [2005/2579] headers/deps: net: Split <net/ipv6_api_sock.h> header out of <net/ipv6.h>
config: i386-randconfig-a013 (https://download.01.org/0day-ci/archive/20220421/202204211908.ZazXpu8z-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project bac6cd5bf85669e3376610cfc4c4f9ca015e7b9b)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=c69b0b89e88734be4e9bf8aad8f3fbcbf0b05df9
        git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git
        git fetch --no-tags mingo-tip sched/headers
        git checkout c69b0b89e88734be4e9bf8aad8f3fbcbf0b05df9
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/crypto/ arch/x86/entry/vdso/ arch/x86/events/amd/ arch/x86/kernel/ arch/x86/pci/ kernel/bpf/ kernel/trace/ net/ipv6/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> net/ipv6/mcast.c:258:5: warning: no previous prototype for function 'ipv6_sock_mc_join_ssm' [-Wmissing-prototypes]
   int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
       ^
   net/ipv6/mcast.c:258:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
   ^
   static 
   1 warning generated.


vim +/ipv6_sock_mc_join_ssm +258 net/ipv6/mcast.c

^1da177e4c3f41 Linus Torvalds 2005-04-16  257  
c7ea20c9da5b94 Hangbin Liu    2018-07-10 @258  int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
c7ea20c9da5b94 Hangbin Liu    2018-07-10  259  			  const struct in6_addr *addr, unsigned int mode)
c7ea20c9da5b94 Hangbin Liu    2018-07-10  260  {
c7ea20c9da5b94 Hangbin Liu    2018-07-10  261  	return __ipv6_sock_mc_join(sk, ifindex, addr, mode);
c7ea20c9da5b94 Hangbin Liu    2018-07-10  262  }
c7ea20c9da5b94 Hangbin Liu    2018-07-10  263  

:::::: The code at line 258 was first introduced by commit
:::::: c7ea20c9da5b94e400c8dcc0adb99411f2e430a6 ipv6/mcast: init as INCLUDE when join SSM INCLUDE group

:::::: TO: Hangbin Liu <liuhangbin@gmail.com>
:::::: CC: David S. Miller <davem@davemloft.net>

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