Hi Antonio,

kernel test robot noticed the following build errors:

[auto build test ERROR on 03fc07a24735e0be8646563913abf5f5cb71ad19]

url:    
https://github.com/intel-lab-lkp/linux/commits/Antonio-Quartulli/netlink-add-NLA_POLICY_MAX_LEN-macro/20241025-173611
base:   03fc07a24735e0be8646563913abf5f5cb71ad19
patch link:    
https://lore.kernel.org/r/20241025-b4-ovpn-v10-9-b87530777be7%40openvpn.net
patch subject: [PATCH net-next v10 09/23] ovpn: implement basic RX path (UDP)
config: m68k-randconfig-r072-20241027 
(https://download.01.org/0day-ci/archive/20241027/202410270433.eqtw7j8w-...@intel.com/config)
compiler: m68k-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): 
(https://download.01.org/0day-ci/archive/20241027/202410270433.eqtw7j8w-...@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 <l...@intel.com>
| Closes: 
https://lore.kernel.org/oe-kbuild-all/202410270433.eqtw7j8w-...@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/asm-generic/bug.h:5,
                    from arch/m68k/include/asm/bug.h:32,
                    from include/linux/bug.h:5,
                    from include/linux/random.h:6,
                    from include/linux/net.h:18,
                    from drivers/net/ovpn/socket.c:10:
   drivers/net/ovpn/socket.c: In function 'ovpn_from_udp_sock':
>> drivers/net/ovpn/socket.c:84:32: error: implicit declaration of function 
>> 'udp_sk' [-Wimplicit-function-declaration]
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                                ^~~~~~
   include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
      77 | # define unlikely(x)    __builtin_expect(!!(x), 0)
         |                                             ^
   include/linux/compiler_types.h:505:9: note: in expansion of macro 
'__compiletime_assert'
     505 |         __compiletime_assert(condition, msg, prefix, suffix)
         |         ^~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:517:9: note: in expansion of macro 
'_compiletime_assert'
     517 |         _compiletime_assert(condition, msg, __compiletime_assert_, 
__COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:9: note: in expansion of macro 
'compiletime_assert'
      36 |         compiletime_assert(__native_word(t) || sizeof(t) == 
sizeof(long long),  \
         |         ^~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:28: note: in expansion of macro 
'__native_word'
      36 |         compiletime_assert(__native_word(t) || sizeof(t) == 
sizeof(long long),  \
         |                            ^~~~~~~~~~~~~
   include/asm-generic/rwonce.h:49:9: note: in expansion of macro 
'compiletime_assert_rwonce_type'
      49 |         compiletime_assert_rwonce_type(x);                           
   \
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/ovpn/socket.c:84:22: note: in expansion of macro 'READ_ONCE'
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                      ^~~~~~~~~
>> drivers/net/ovpn/socket.c:84:42: error: invalid type argument of '->' (have 
>> 'int')
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                                          ^~
   include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
      77 | # define unlikely(x)    __builtin_expect(!!(x), 0)
         |                                             ^
   include/linux/compiler_types.h:505:9: note: in expansion of macro 
'__compiletime_assert'
     505 |         __compiletime_assert(condition, msg, prefix, suffix)
         |         ^~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:517:9: note: in expansion of macro 
'_compiletime_assert'
     517 |         _compiletime_assert(condition, msg, __compiletime_assert_, 
__COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:9: note: in expansion of macro 
'compiletime_assert'
      36 |         compiletime_assert(__native_word(t) || sizeof(t) == 
sizeof(long long),  \
         |         ^~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:28: note: in expansion of macro 
'__native_word'
      36 |         compiletime_assert(__native_word(t) || sizeof(t) == 
sizeof(long long),  \
         |                            ^~~~~~~~~~~~~
   include/asm-generic/rwonce.h:49:9: note: in expansion of macro 
'compiletime_assert_rwonce_type'
      49 |         compiletime_assert_rwonce_type(x);                           
   \
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/ovpn/socket.c:84:22: note: in expansion of macro 'READ_ONCE'
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                      ^~~~~~~~~
>> drivers/net/ovpn/socket.c:84:42: error: invalid type argument of '->' (have 
>> 'int')
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                                          ^~
   include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
      77 | # define unlikely(x)    __builtin_expect(!!(x), 0)
         |                                             ^
   include/linux/compiler_types.h:505:9: note: in expansion of macro 
'__compiletime_assert'
     505 |         __compiletime_assert(condition, msg, prefix, suffix)
         |         ^~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:517:9: note: in expansion of macro 
'_compiletime_assert'
     517 |         _compiletime_assert(condition, msg, __compiletime_assert_, 
__COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:9: note: in expansion of macro 
'compiletime_assert'
      36 |         compiletime_assert(__native_word(t) || sizeof(t) == 
sizeof(long long),  \
         |         ^~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:28: note: in expansion of macro 
'__native_word'
      36 |         compiletime_assert(__native_word(t) || sizeof(t) == 
sizeof(long long),  \
         |                            ^~~~~~~~~~~~~
   include/asm-generic/rwonce.h:49:9: note: in expansion of macro 
'compiletime_assert_rwonce_type'
      49 |         compiletime_assert_rwonce_type(x);                           
   \
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/ovpn/socket.c:84:22: note: in expansion of macro 'READ_ONCE'
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                      ^~~~~~~~~
>> drivers/net/ovpn/socket.c:84:42: error: invalid type argument of '->' (have 
>> 'int')
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                                          ^~
   include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
      77 | # define unlikely(x)    __builtin_expect(!!(x), 0)
         |                                             ^
   include/linux/compiler_types.h:505:9: note: in expansion of macro 
'__compiletime_assert'
     505 |         __compiletime_assert(condition, msg, prefix, suffix)
         |         ^~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:517:9: note: in expansion of macro 
'_compiletime_assert'
     517 |         _compiletime_assert(condition, msg, __compiletime_assert_, 
__COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:9: note: in expansion of macro 
'compiletime_assert'
      36 |         compiletime_assert(__native_word(t) || sizeof(t) == 
sizeof(long long),  \
         |         ^~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:28: note: in expansion of macro 
'__native_word'
      36 |         compiletime_assert(__native_word(t) || sizeof(t) == 
sizeof(long long),  \
         |                            ^~~~~~~~~~~~~
   include/asm-generic/rwonce.h:49:9: note: in expansion of macro 
'compiletime_assert_rwonce_type'
      49 |         compiletime_assert_rwonce_type(x);                           
   \
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/ovpn/socket.c:84:22: note: in expansion of macro 'READ_ONCE'
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                      ^~~~~~~~~
>> drivers/net/ovpn/socket.c:84:42: error: invalid type argument of '->' (have 
>> 'int')
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                                          ^~
   include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
      77 | # define unlikely(x)    __builtin_expect(!!(x), 0)
         |                                             ^
   include/linux/compiler_types.h:505:9: note: in expansion of macro 
'__compiletime_assert'
     505 |         __compiletime_assert(condition, msg, prefix, suffix)
         |         ^~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:517:9: note: in expansion of macro 
'_compiletime_assert'
     517 |         _compiletime_assert(condition, msg, __compiletime_assert_, 
__COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:9: note: in expansion of macro 
'compiletime_assert'
      36 |         compiletime_assert(__native_word(t) || sizeof(t) == 
sizeof(long long),  \
         |         ^~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:28: note: in expansion of macro 
'__native_word'
      36 |         compiletime_assert(__native_word(t) || sizeof(t) == 
sizeof(long long),  \
         |                            ^~~~~~~~~~~~~
   include/asm-generic/rwonce.h:49:9: note: in expansion of macro 
'compiletime_assert_rwonce_type'
      49 |         compiletime_assert_rwonce_type(x);                           
   \
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/ovpn/socket.c:84:22: note: in expansion of macro 'READ_ONCE'
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                      ^~~~~~~~~
>> drivers/net/ovpn/socket.c:84:42: error: invalid type argument of '->' (have 
>> 'int')
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                                          ^~
   include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
      77 | # define unlikely(x)    __builtin_expect(!!(x), 0)
         |                                             ^
   include/linux/compiler_types.h:505:9: note: in expansion of macro 
'__compiletime_assert'
     505 |         __compiletime_assert(condition, msg, prefix, suffix)
         |         ^~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:517:9: note: in expansion of macro 
'_compiletime_assert'
     517 |         _compiletime_assert(condition, msg, __compiletime_assert_, 
__COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:9: note: in expansion of macro 
'compiletime_assert'
      36 |         compiletime_assert(__native_word(t) || sizeof(t) == 
sizeof(long long),  \
         |         ^~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:49:9: note: in expansion of macro 
'compiletime_assert_rwonce_type'
      49 |         compiletime_assert_rwonce_type(x);                           
   \
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/ovpn/socket.c:84:22: note: in expansion of macro 'READ_ONCE'
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                      ^~~~~~~~~
>> drivers/net/ovpn/socket.c:84:42: error: invalid type argument of '->' (have 
>> 'int')
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                                          ^~
   include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
      77 | # define unlikely(x)    __builtin_expect(!!(x), 0)
         |                                             ^
   include/asm-generic/rwonce.h:44:43: note: in expansion of macro 
'__unqual_scalar_typeof'
      44 | #define __READ_ONCE(x)  (*(const volatile __unqual_scalar_typeof(x) 
*)&(x))
         |                                           ^~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:50:9: note: in expansion of macro '__READ_ONCE'
      50 |         __READ_ONCE(x);                                              
   \
         |         ^~~~~~~~~~~
   drivers/net/ovpn/socket.c:84:22: note: in expansion of macro 'READ_ONCE'
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                      ^~~~~~~~~
>> drivers/net/ovpn/socket.c:84:42: error: invalid type argument of '->' (have 
>> 'int')
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                                          ^~
   include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
      77 | # define unlikely(x)    __builtin_expect(!!(x), 0)
         |                                             ^
   include/asm-generic/rwonce.h:50:9: note: in expansion of macro '__READ_ONCE'
      50 |         __READ_ONCE(x);                                              
   \
         |         ^~~~~~~~~~~
   drivers/net/ovpn/socket.c:84:22: note: in expansion of macro 'READ_ONCE'
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                      ^~~~~~~~~
>> drivers/net/ovpn/socket.c:84:59: error: 'UDP_ENCAP_OVPNINUDP' undeclared 
>> (first use in this function)
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                                                           
^~~~~~~~~~~~~~~~~~~
   include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
      77 | # define unlikely(x)    __builtin_expect(!!(x), 0)
         |                                             ^
   drivers/net/ovpn/socket.c:84:59: note: each undeclared identifier is 
reported only once for each function it appears in
      84 |         if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
         |                                                           
^~~~~~~~~~~~~~~~~~~
   include/linux/compiler.h:77:45: note: in definition of macro 'unlikely'
      77 | # define unlikely(x)    __builtin_expect(!!(x), 0)
         |                                             ^


vim +/udp_sk +84 drivers/net/ovpn/socket.c

    76  
    77  /* Retrieve the corresponding ovpn object from a UDP socket
    78   * rcu_read_lock must be held on entry
    79   */
    80  struct ovpn_struct *ovpn_from_udp_sock(struct sock *sk)
    81  {
    82          struct ovpn_socket *ovpn_sock;
    83  
  > 84          if (unlikely(READ_ONCE(udp_sk(sk)->encap_type) != 
UDP_ENCAP_OVPNINUDP))
    85                  return NULL;
    86  
    87          ovpn_sock = rcu_dereference_sk_user_data(sk);
    88          if (unlikely(!ovpn_sock))
    89                  return NULL;
    90  
    91          /* make sure that sk matches our stored transport socket */
    92          if (unlikely(!ovpn_sock->sock || sk != ovpn_sock->sock->sk))
    93                  return NULL;
    94  
    95          return ovpn_sock->ovpn;
    96  }
    97  

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https://github.com/intel/lkp-tests/wiki

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