Hi Ryoga,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on nf-next/master]
[also build test WARNING on nf/master ipvs/master linus/master v5.14-rc3 next-20210728]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Ryoga-Saito/net-add-netfilter-hooks-to-track-SRv6-encapsulated-flows/20210729-165540
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next.git master
config: arc-allyesconfig (attached as .config)
compiler: arceb-elf-gcc (GCC) 10.3.0
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/94a2d9ee8f1c6c8ad998758c4f494719ea7b9a9d
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Ryoga-Saito/net-add-netfilter-hooks-to-track-SRv6-encapsulated-flows/20210729-165540
        git checkout 94a2d9ee8f1c6c8ad998758c4f494719ea7b9a9d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=arc 

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

All warnings (new ones prefixed by >>):

>> net/netfilter/nf_conntrack_lwtunnel.c:26:5: warning: no previous prototype for 'nf_conntrack_lwtunnel_sysctl_handler' [-Wmissing-prototypes]
      26 | int nf_conntrack_lwtunnel_sysctl_handler(struct ctl_table *table, int write,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/nf_conntrack_lwtunnel_sysctl_handler +26 net/netfilter/nf_conntrack_lwtunnel.c

    25	
  > 26	int nf_conntrack_lwtunnel_sysctl_handler(struct ctl_table *table, int write,
    27						 void *buffer, size_t *lenp,
    28						 loff_t *ppos)
    29	{
    30		int proc_nf_ct_lwtunnel_enabled = 0;
    31		struct ctl_table tmp = {
    32			.procname = table->procname,
    33			.data = &proc_nf_ct_lwtunnel_enabled,
    34			.maxlen = sizeof(int),
    35			.mode = table->mode,
    36			.extra1 = SYSCTL_ZERO,
    37			.extra2 = SYSCTL_ONE,
    38		};
    39		int ret;
    40	
    41		if (!write)
    42			proc_nf_ct_lwtunnel_enabled = nf_conntrack_lwtunnel_get();
    43	
    44		ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
    45	
    46		if (write && ret == 0)
    47			ret = nf_conntrack_lwtunnel_set(proc_nf_ct_lwtunnel_enabled);
    48	
    49		return ret;
    50	}
    51	

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