Re: [PATCH net-next 2/2] udp_tunnel: use static call for GRO hooks when possible

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

Hi Paolo,

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/Paolo-Abeni/udp_tunnel-create-a-fast-path-GRO-lookup/20250306-235952
base:   net-next/main
patch link:    https://lore.kernel.org/r/740cd03d2982943c313de334977e18cc9de1bc3e.1741275846.git.pabeni%40redhat.com
patch subject: [PATCH net-next 2/2] udp_tunnel: use static call for GRO hooks when possible
config: mips-rt305x_defconfig (https://download.01.org/0day-ci/archive/20250307/202503071931.FDaDRKvW-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250307/202503071931.FDaDRKvW-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/202503071931.FDaDRKvW-lkp@intel.com/

All errors (new ones prefixed by >>):

>> net/ipv4/udp_offload.c:172:9: error: incompatible pointer types returning 'struct sk_buff *' from a function with result type 'struct skbuff *' [-Werror,-Wincompatible-pointer-types]
     172 |         return call_gro_receive_sk(udp_sk(sk)->gro_receive, sk, head, skb);
         |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> net/ipv4/udp_offload.c:782:5: error: incompatible pointer types assigning to 'struct sk_buff *' from 'struct skbuff *' [-Werror,-Wincompatible-pointer-types]
     782 |         pp = udp_tunnel_gro_rcv(sk, head, skb);
         |            ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> net/ipv4/udp_offload.c:932:14: error: use of undeclared identifier 'udp_tunnel_gro_type_lock'; did you mean 'udp_tunnel_gro_rcv'?
     932 |         mutex_init(&udp_tunnel_gro_type_lock);
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~
         |                     udp_tunnel_gro_rcv
   include/linux/mutex.h:64:16: note: expanded from macro 'mutex_init'
      64 |         __mutex_init((mutex), #mutex, &__key);                          \
         |                       ^
   net/ipv4/udp_offload.c:168:23: note: 'udp_tunnel_gro_rcv' declared here
     168 | static struct skbuff *udp_tunnel_gro_rcv(struct sock *sk,
         |                       ^
>> net/ipv4/udp_offload.c:932:2: error: incompatible pointer types passing 'struct skbuff *(*)(struct sock *, struct list_head *, struct sk_buff *)' to parameter of type 'struct mutex *' [-Werror,-Wincompatible-pointer-types]
     932 |         mutex_init(&udp_tunnel_gro_type_lock);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/mutex.h:64:15: note: expanded from macro 'mutex_init'
      64 |         __mutex_init((mutex), #mutex, &__key);                          \
         |                      ^~~~~~~
   include/linux/mutex.h:89:40: note: passing argument to parameter 'lock' here
      89 | extern void __mutex_init(struct mutex *lock, const char *name,
         |                                        ^
   4 errors generated.


vim +172 net/ipv4/udp_offload.c

   167	
 > 168	static struct skbuff *udp_tunnel_gro_rcv(struct sock *sk,
   169						 struct list_head *head,
   170						 struct sk_buff *skb)
   171	{
 > 172		return call_gro_receive_sk(udp_sk(sk)->gro_receive, sk, head, skb);
   173	}
   174	

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