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 3c5a2fd042d0bfac71a2dfb99515723d318df47b config: x86_64-randconfig-s022-20210214 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-215-g0fb77bb6-dirty # https://github.com/0day-ci/linux/commit/50d689e601cc17c3b2bf668b2e5be766e... 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/20210214-015930 git checkout 50d689e601cc17c3b2bf668b2e5be766e9dbc7b3 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" net/ipv6/mcast.c:754:9: sparse: sparse: incompatible types in comparison expression (different address spaces): net/ipv6/mcast.c:754:9: sparse: struct ifmcaddr6 [noderef] __rcu * net/ipv6/mcast.c:754:9: sparse: struct ifmcaddr6 * net/ipv6/mcast.c:2344:63: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct ip6_sf_list *[assigned] dpsf @@ got struct ip6_sf_list [noderef] __rcu *sf_next @@ net/ipv6/mcast.c:440:17: sparse: sparse: incompatible types in comparison expression (different address spaces): net/ipv6/mcast.c:440:17: sparse: struct ip6_sf_socklist [noderef] __rcu * net/ipv6/mcast.c:440:17: sparse: struct ip6_sf_socklist * net/ipv6/mcast.c: note: in included file: include/net/mld.h:32:43: sparse: sparse: array of flexible structures net/ipv6/mcast.c:1841:51: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct ip6_sf_list [noderef] __rcu * @@ got struct ip6_sf_list * @@ net/ipv6/mcast.c:1911:20: sparse: sparse: incompatible types in comparison expression (different address spaces): net/ipv6/mcast.c:1952:50: sparse: expected struct ip6_sf_list **ppsf net/ipv6/mcast.c:1952:50: sparse: got struct ip6_sf_list [noderef] __rcu ** net/ipv6/mcast.c:267:25: sparse: sparse: context imbalance in 'ip6_mc_find_dev_rcu' - different lock contexts for basic block net/ipv6/mcast.c:457:9: sparse: sparse: context imbalance in 'ip6_mc_source' - unexpected unlock net/ipv6/mcast.c:546:9: sparse: sparse: context imbalance in 'ip6_mc_msfilter' - unexpected unlock net/ipv6/mcast.c:593:21: sparse: sparse: context imbalance in 'ip6_mc_msfget' - unexpected unlock net/ipv6/mcast.c:2758:25: sparse: sparse: context imbalance in 'igmp6_mc_get_next' - unexpected unlock net/ipv6/mcast.c:2780:9: sparse: sparse: context imbalance in 'igmp6_mc_get_idx' - wrong count at exit net/ipv6/mcast.c:2807:9: sparse: sparse: context imbalance in 'igmp6_mc_seq_stop' - unexpected unlock net/ipv6/mcast.c:2879:31: sparse: sparse: context imbalance in 'igmp6_mcf_get_next' - unexpected unlock net/ipv6/mcast.c:2911:9: sparse: sparse: context imbalance in 'igmp6_mcf_get_idx' - wrong count at exit net/ipv6/mcast.c:2928:9: sparse: sparse: context imbalance in 'igmp6_mcf_seq_next' - wrong count at exit net/ipv6/mcast.c:2941:17: sparse: sparse: context imbalance in 'igmp6_mcf_seq_stop' - unexpected unlock vim +783 net/ipv6/mcast.c 757 758 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 759 { 760 struct in6_addr *pmca = &im->mca_addr; 761 struct ip6_sf_list *psf, *sources; 762 struct ifmcaddr6 *pmc, *pmc_prev; 763 764 pmc_prev = NULL; 765 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) { 766 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 767 break; 768 pmc_prev = pmc; 769 } 770 if (pmc) { 771 if (pmc_prev) 772 pmc_prev->next = pmc->next; 773 else 774 idev->mc_tomb = pmc->next; 775 } 776 777 spin_lock_bh(&im->mca_lock); 778 if (pmc) { 779 im->idev = pmc->idev; 780 if (im->mca_sfmode == MCAST_INCLUDE) { 781 swap(im->mca_tomb, pmc->mca_tomb); 782 784 pmc->mca_sources, 785 lockdep_rtnl_is_held()); 786 rcu_assign_pointer(pmc->mca_sources, sources); 787 for_each_psf_rtnl(im, psf) 788 psf->sf_crcount = idev->mc_qrv; 789 } else { 790 im->mca_crcount = idev->mc_qrv; 791 } 792 in6_dev_put(pmc->idev); 793 ip6_mc_clear_src(pmc); 794 kfree(pmc); 795 } 796 spin_unlock_bh(&im->mca_lock); 797 } 798 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org