Hi Eric,

I love your patch! Yet something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Eric-Dumazet/gro-get-out-of-core-files/20211116-010906
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 1274a4eb318debe33e395bb8bcf8b98e6eb4670f
config: csky-defconfig (attached as .config)
compiler: csky-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/4a142ba0812a293afcb259b08c89ab80cb3dac6d
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Eric-Dumazet/gro-get-out-of-core-files/20211116-010906
        git checkout 4a142ba0812a293afcb259b08c89ab80cb3dac6d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=csky 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from net/ipv4/af_inet.c:102:
   include/net/gro.h: In function 'ip6_gro_compute_pseudo':
   include/net/gro.h:413:29: error: implicit declaration of function 'csum_ipv6_magic'; did you mean 'csum_tcpudp_magic'? [-Werror=implicit-function-declaration]
     413 |         return ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr,
         |                             ^~~~~~~~~~~~~~~
         |                             csum_tcpudp_magic
   In file included from include/net/udplite.h:8,
                    from net/ipv4/af_inet.c:105:
   include/net/ip6_checksum.h: At top level:
>> include/net/ip6_checksum.h:34:9: error: conflicting types for 'csum_ipv6_magic'; have '__sum16(const struct in6_addr *, const struct in6_addr *, __u32,  __u8,  __wsum)' {aka 'short unsigned int(const struct in6_addr *, const struct in6_addr *, unsigned int,  unsigned char,  unsigned int)'}
      34 | __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
         |         ^~~~~~~~~~~~~~~
   In file included from net/ipv4/af_inet.c:102:
   include/net/gro.h:413:29: note: previous implicit declaration of 'csum_ipv6_magic' with type 'int()'
     413 |         return ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr,
         |                             ^~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +34 include/net/ip6_checksum.h

^1da177e4c3f41 Linus Torvalds  2005-04-16  32  
^1da177e4c3f41 Linus Torvalds  2005-04-16  33  #ifndef _HAVE_ARCH_IPV6_CSUM
acb3e04119fbf9 Cong Wang       2013-01-07 @34  __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
56649d5d3c4cb0 Al Viro         2006-11-14  35  			const struct in6_addr *daddr,
1e94082963747b Alexander Duyck 2016-03-11  36  			__u32 len, __u8 proto, __wsum csum);
^1da177e4c3f41 Linus Torvalds  2005-04-16  37  #endif
8663e02aba154e Vlad Yasevich   2012-11-15  38  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org