[kbuild-all] net/netfilter/nf_conntrack_netlink.c:3414:29: sparse: sparse: incorrect type in argument 1 (different address spaces)

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 4b6c093e21d36bede0fd88fd0aeb3b03647260e4 commit: 670d0a4b10704667765f7d18f7592993d02783aa sparse: use identifiers to define address spaces date: 8 weeks ago config: xtensa-randconfig-s032-20200816 (attached as .config) compiler: xtensa-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-180-g49f7e13a-dirty git checkout 670d0a4b10704667765f7d18f7592993d02783aa # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=xtensa 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/netfilter/nf_conntrack_netlink.c:1962:34: sparse: sparse: incompatible types in comparison expression (different address spaces): net/netfilter/nf_conntrack_netlink.c:1962:34: sparse: struct nf_conntrack_helper [noderef] __rcu * net/netfilter/nf_conntrack_netlink.c:1962:34: sparse: struct nf_conntrack_helper * net/netfilter/nf_conntrack_netlink.c:3414:29: sparse: expected char const *__cs net/netfilter/nf_conntrack_netlink.c:3414:29: sparse: got char [noderef] __rcu * net/netfilter/nf_conntrack_netlink.c: note: in included file (through include/linux/seqlock.h, include/linux/time.h, include/linux/stat.h, ...): include/linux/spinlock.h:393:9: sparse: sparse: context imbalance in 'ctnetlink_dump_table' - unexpected unlock # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 670d0a4b10704667765f7d18f7592993d02783aa vim +3414 net/netfilter/nf_conntrack_netlink.c c1d10adb4a521d Pablo Neira Ayuso 2006-01-05 3406 ac7b848390036d Florian Westphal 2017-07-26 3407 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data) ac7b848390036d Florian Westphal 2017-07-26 3408 { ac7b848390036d Florian Westphal 2017-07-26 3409 const struct nf_conn_help *m_help; ac7b848390036d Florian Westphal 2017-07-26 3410 const char *name = data; ac7b848390036d Florian Westphal 2017-07-26 3411 ac7b848390036d Florian Westphal 2017-07-26 3412 m_help = nfct_help(exp->master); ac7b848390036d Florian Westphal 2017-07-26 3413 ac7b848390036d Florian Westphal 2017-07-26 @3414 return strcmp(m_help->helper->name, name) == 0; ac7b848390036d Florian Westphal 2017-07-26 3415 } ac7b848390036d Florian Westphal 2017-07-26 3416 :::::: The code at line 3414 was first introduced by commit :::::: ac7b848390036dadd4351899d2a23748075916bd netfilter: expect: add and use nf_ct_expect_iterate helpers :::::: TO: Florian Westphal <fw(a)strlen.de&gt; :::::: CC: Pablo Neira Ayuso <pablo(a)netfilter.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org