Hi Antonio,

kernel test robot noticed the following build errors:

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

url:    https://github.com/intel-lab-lkp/linux/commits/Antonio-Quartulli/net-introduce-OpenVPN-Data-Channel-Offload-ovpn/20240107-061631
base:   net-next/main
patch link:    https://lore.kernel.org/r/20240106215740.14770-2-antonio%40openvpn.net
patch subject: [PATCH net-next 1/1] net: introduce OpenVPN Data Channel Offload (ovpn)
config: x86_64-allmodconfig (https://download.01.org/0day-ci/archive/20240107/202401072315.mmiDVWdK-lkp@intel.com/config)
compiler: ClangBuiltLinux clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240107/202401072315.mmiDVWdK-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 [off-list ref]
| Closes: https://lore.kernel.org/oe-kbuild-all/202401072315.mmiDVWdK-lkp@intel.com/ (local)

All error/warnings (new ones prefixed by >>):

quoted

drivers/net/ovpn/netlink.c:42:31: error: call to undeclared function 'NLA_POLICY_MAX_LEN'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]

      42 |         [OVPN_A_KEYDIR_CIPHER_KEY] = NLA_POLICY_MAX_LEN(U8_MAX),
         |                                      ^

quoted

drivers/net/ovpn/netlink.c:42:31: warning: suggest braces around initialization of subobject [-Wmissing-braces]

      42 |         [OVPN_A_KEYDIR_CIPHER_KEY] = NLA_POLICY_MAX_LEN(U8_MAX),
         |                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~
         |                                      {                         }

quoted

drivers/net/ovpn/netlink.c:42:31: error: initializer element is not a compile-time constant

      42 |         [OVPN_A_KEYDIR_CIPHER_KEY] = NLA_POLICY_MAX_LEN(U8_MAX),
         |                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/ovpn/netlink.c:63:27: warning: suggest braces around initialization of subobject [-Wmissing-braces]
      63 |         [OVPN_A_PEER_LOCAL_IP] = NLA_POLICY_MAX_LEN(sizeof(struct in6_addr)),
         |                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         |                                  {                                          }
   drivers/net/ovpn/netlink.c:64:29: warning: suggest braces around initialization of subobject [-Wmissing-braces]
      64 |         [OVPN_A_PEER_LOCAL_PORT] = NLA_POLICY_MAX_LEN(sizeof(u16)),
         |                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         |                                    {                              }
   drivers/net/ovpn/netlink.c:63:27: error: initializer element is not a compile-time constant
      63 |         [OVPN_A_PEER_LOCAL_IP] = NLA_POLICY_MAX_LEN(sizeof(struct in6_addr)),
         |                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/ovpn/netlink.c:75:20: warning: suggest braces around initialization of subobject [-Wmissing-braces]
      75 |         [OVPN_A_IFNAME] = NLA_POLICY_MAX_LEN(IFNAMSIZ),
         |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
         |                           {                           }
   drivers/net/ovpn/netlink.c:75:20: error: initializer element is not a compile-time constant
      75 |         [OVPN_A_IFNAME] = NLA_POLICY_MAX_LEN(IFNAMSIZ),
         |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 warnings and 4 errors generated.
--

quoted

drivers/net/ovpn/peer.c:366: warning: Function parameter or member 'src' not described in 'ovpn_nexthop_lookup4'
drivers/net/ovpn/peer.c:366: warning: expecting prototype for ovpn_rpf4(). Prototype was for ovpn_nexthop_lookup4() instead
drivers/net/ovpn/peer.c:412: warning: Function parameter or member 'addr' not described in 'ovpn_nexthop_lookup6'
drivers/net/ovpn/peer.c:412: warning: expecting prototype for ovpn_rpf6(). Prototype was for ovpn_nexthop_lookup6() instead

vim +/NLA_POLICY_MAX_LEN +42 drivers/net/ovpn/netlink.c

    39	
    40	/** KEYDIR policy. Can be used for configuring an encryption and a decryption key */
    41	static const struct nla_policy ovpn_nl_policy_keydir[NUM_OVPN_A_KEYDIR] = {
  > 42		[OVPN_A_KEYDIR_CIPHER_KEY] = NLA_POLICY_MAX_LEN(U8_MAX),
    43		[OVPN_A_KEYDIR_NONCE_TAIL] = NLA_POLICY_EXACT_LEN(NONCE_TAIL_SIZE),
    44	};
    45	

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