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: arm-wpcm450_defconfig (https://download.01.org/0day-ci/archive/20250307/202503071846.PFKkO7SH-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250307/202503071846.PFKkO7SH-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/202503071846.PFKkO7SH-lkp@intel.com/

All errors (new ones prefixed by >>):

   net/ipv4/udp_offload.c: In function 'udp_tunnel_gro_rcv':
>> net/ipv4/udp_offload.c:172:16: error: returning 'struct sk_buff *' from a function with incompatible return type 'struct skbuff *' [-Wincompatible-pointer-types]
     172 |         return call_gro_receive_sk(udp_sk(sk)->gro_receive, sk, head, skb);
         |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   net/ipv4/udp_offload.c: In function 'udp_gro_receive':
>> net/ipv4/udp_offload.c:782:12: error: assignment to 'struct sk_buff *' from incompatible pointer type 'struct skbuff *' [-Wincompatible-pointer-types]
     782 |         pp = udp_tunnel_gro_rcv(sk, head, skb);
         |            ^
   In file included from include/linux/seqlock.h:19,
                    from include/linux/dcache.h:11,
                    from include/linux/fs.h:8,
                    from include/linux/highmem.h:5,
                    from include/linux/bvec.h:10,
                    from include/linux/skbuff.h:17,
                    from net/ipv4/udp_offload.c:9:
   net/ipv4/udp_offload.c: In function 'udpv4_offload_init':
>> net/ipv4/udp_offload.c:932:21: error: 'udp_tunnel_gro_type_lock' undeclared (first use in this function); did you mean 'udp_tunnel_gro_rcv'?
     932 |         mutex_init(&udp_tunnel_gro_type_lock);
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/mutex.h:64:23: note: in definition of macro 'mutex_init'
      64 |         __mutex_init((mutex), #mutex, &__key);                          \
         |                       ^~~~~
   net/ipv4/udp_offload.c:932:21: note: each undeclared identifier is reported only once for each function it appears in
     932 |         mutex_init(&udp_tunnel_gro_type_lock);
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/mutex.h:64:23: note: in definition of macro 'mutex_init'
      64 |         __mutex_init((mutex), #mutex, &__key);                          \
         |                       ^~~~~


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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