Hi Taehee, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on net-next/master] url: https://github.com/0day-ci/linux/commits/Taehee-Yoo/mld-change-context-fr... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 6626a0266566c5aea16178c5e6cd7fc4db3f2f56 config: mips-allyesconfig (attached as .config) compiler: mips-linux-gcc (GCC) 9.3.0 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/0631c9a306555a1d9ee0aefbd7a0cdc89... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Taehee-Yoo/mld-change-context-from-atomic-to-sleepable/20210209-072339 git checkout 0631c9a306555a1d9ee0aefbd7a0cdc892719dd6 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): net/ipv6/mcast.c: In function 'ip6_mc_del_src': 2150 | int i, err, rv; | ^ net/ipv6/mcast.c: In function 'ip6_mc_del_src_bulk': net/ipv6/mcast.c:2218:6: warning: variable 'i' set but not used [-Wunused-but-set-variable] 2218 | int i, rv; | ^ vim +/i +2150 net/ipv6/mcast.c 2143 2144 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *mca, 2145 int sfmode, const struct in6_addr *psfsrc, int delta) 2146 { 2147 struct ifmcaddr6 *mc; 2148 bool found = false; 2149 int changerec = 0; 2151 2152 if (!idev) 2153 return -ENODEV; 2154 2155 read_lock_bh(&idev->lock); 2156 list_for_each_entry(mc, &idev->mc_list, list) { 2157 if (ipv6_addr_equal(mca, &mc->mca_addr)) { 2158 found = true; 2159 break; 2160 } 2161 } 2162 if (!found) { 2163 /* MCA not found?? bug */ 2164 read_unlock_bh(&idev->lock); 2165 return -ESRCH; 2166 } 2167 spin_lock_bh(&mc->mca_lock); 2168 sf_markstate(mc); 2169 if (!delta) { 2170 if (!mc->mca_sfcount[sfmode]) { 2171 spin_unlock_bh(&mc->mca_lock); 2172 read_unlock_bh(&idev->lock); 2173 return -EINVAL; 2174 } 2175 mc->mca_sfcount[sfmode]--; 2176 } 2177 err = 0; 2178 i = 0; 2179 2180 if (psfsrc) { 2181 rv = ip6_mc_del1_src(mc, sfmode, psfsrc); 2182 2183 changerec |= rv > 0; 2184 if (!err && rv < 0) 2185 err = rv; 2186 } 2187 2188 if (mc->mca_sfmode == MCAST_EXCLUDE && 2189 mc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2190 mc->mca_sfcount[MCAST_INCLUDE]) { 2191 struct ip6_sf_list *psf; 2192 2193 /* filter mode change */ 2194 mc->mca_sfmode = MCAST_INCLUDE; 2195 mc->mca_crcount = idev->mc_qrv; 2196 idev->mc_ifc_count = mc->mca_crcount; 2197 list_for_each_entry(psf, &mc->mca_source_list, list) 2198 psf->sf_crcount = 0; 2199 mld_ifc_event(mc->idev); 2200 } else if (sf_setstate(mc) || changerec) { 2201 mld_ifc_event(mc->idev); 2202 } 2203 spin_unlock_bh(&mc->mca_lock); 2204 read_unlock_bh(&idev->lock); 2205 return err; 2206 } 2207 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org