Re: [PATCH net-next 1/2] tcp: Consider every port when connecting with IP_LOCAL_PORT_RANGE

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

Hi Jakub,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Jakub-Sitnicki/selftests-net-Cover-port-sharing-scenarios-with-IP_LOCAL_PORT_RANGE/20250626-200955
base:   net-next/main
patch link:    https://lore.kernel.org/r/20250626120247.1255223-1-jakub%40cloudflare.com
patch subject: [PATCH net-next 1/2] tcp: Consider every port when connecting with IP_LOCAL_PORT_RANGE
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20250627/202506270619.Cjd8lmig-lkp@intel.com/config)
compiler: clang version 20.1.7 (https://github.com/llvm/llvm-project 6146a88f60492b520a36f8f8f3231e15f3cc6082)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250627/202506270619.Cjd8lmig-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/202506270619.Cjd8lmig-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> net/ipv4/inet_hashtables.c:1015:21: warning: unused variable 'sk2' [-Wunused-variable]
    1015 |         const struct sock *sk2;
         |                            ^~~
   1 warning generated.


vim +/sk2 +1015 net/ipv4/inet_hashtables.c

  1007	
  1008	/* True on source address conflict with another socket. False otherwise.
  1009	 * Caller must hold hashbucket lock for this tb.
  1010	 */
  1011	static inline bool check_bound(const struct sock *sk,
  1012				       const struct inet_bind_bucket *tb)
  1013	{
  1014		const struct inet_bind2_bucket *tb2;
> 1015		const struct sock *sk2;
  1016	
  1017		hlist_for_each_entry(tb2, &tb->bhash2, bhash_node) {
  1018	#if IS_ENABLED(CONFIG_IPV6)
  1019			if (sk->sk_family == AF_INET6) {
  1020				if (tb2->addr_type == IPV6_ADDR_ANY ||
  1021				    ipv6_addr_equal(&tb2->v6_rcv_saddr,
  1022						    &sk->sk_v6_rcv_saddr))
  1023					return true;
  1024				continue;
  1025			}
  1026	
  1027			/* Check for ipv6 non-v6only wildcard sockets */
  1028			if (tb2->addr_type == IPV6_ADDR_ANY)
  1029				sk_for_each_bound(sk2, &tb2->owners)
  1030					if (!sk2->sk_ipv6only)
  1031						return true;
  1032	
  1033			if (tb2->addr_type != IPV6_ADDR_MAPPED)
  1034				continue;
  1035	#endif
  1036			if (tb2->rcv_saddr == INADDR_ANY ||
  1037			    tb2->rcv_saddr == sk->sk_rcv_saddr)
  1038				return true;
  1039		}
  1040	
  1041		return false;
  1042	}
  1043	

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