tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 5631c5e0eb9035d92ceb20fcd9cdb7779a3f5cc7 commit: 00720f0e7f288d29681d265c23b22bb0f0f4e5b4 smack: avoid unused 'sip' variable warning date: 3 months ago config: s390-randconfig-s032-20200808 (attached as .config) compiler: s390-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: v0.6.2-118-ge1578773-dirty git checkout 00720f0e7f288d29681d265c23b22bb0f0f4e5b4 # 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=s390 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 >>) security/smack/smack_lsm.c:1780:61: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct cred const *cred @@ got struct cred const [noderef] <asn:4> *cred @@ security/smack/smack_lsm.c:1780:61: sparse: expected struct cred const *cred security/smack/smack_lsm.c:1780:61: sparse: got struct cred const [noderef] <asn:4> *cred security/smack/smack_lsm.c:2498:27: sparse: expected restricted __be16 [usertype] dport security/smack/smack_lsm.c:4751:30: sparse: sparse: cast removes address space '<asn:4>' of expression vim +2498 security/smack/smack_lsm.c e114e473771c84 Casey Schaufler 2008-02-04 2475 21abb1ec414c75 Casey Schaufler 2015-07-22 2476 /** 21abb1ec414c75 Casey Schaufler 2015-07-22 2477 * smk_ipv6_check - check Smack access 21abb1ec414c75 Casey Schaufler 2015-07-22 2478 * @subject: subject Smack label 21abb1ec414c75 Casey Schaufler 2015-07-22 2479 * @object: object Smack label 21abb1ec414c75 Casey Schaufler 2015-07-22 2480 * @address: address 21abb1ec414c75 Casey Schaufler 2015-07-22 2481 * @act: the action being taken 21abb1ec414c75 Casey Schaufler 2015-07-22 2482 * 21abb1ec414c75 Casey Schaufler 2015-07-22 2483 * Check an IPv6 access 21abb1ec414c75 Casey Schaufler 2015-07-22 2484 */ 21abb1ec414c75 Casey Schaufler 2015-07-22 2485 static int smk_ipv6_check(struct smack_known *subject, 21abb1ec414c75 Casey Schaufler 2015-07-22 2486 struct smack_known *object, 21abb1ec414c75 Casey Schaufler 2015-07-22 2487 struct sockaddr_in6 *address, int act) 21abb1ec414c75 Casey Schaufler 2015-07-22 2488 { 21abb1ec414c75 Casey Schaufler 2015-07-22 2489 #ifdef CONFIG_AUDIT 21abb1ec414c75 Casey Schaufler 2015-07-22 2490 struct lsm_network_audit net; 21abb1ec414c75 Casey Schaufler 2015-07-22 2491 #endif 21abb1ec414c75 Casey Schaufler 2015-07-22 2492 struct smk_audit_info ad; 21abb1ec414c75 Casey Schaufler 2015-07-22 2493 int rc; 21abb1ec414c75 Casey Schaufler 2015-07-22 2494 21abb1ec414c75 Casey Schaufler 2015-07-22 2495 #ifdef CONFIG_AUDIT 21abb1ec414c75 Casey Schaufler 2015-07-22 2496 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); 21abb1ec414c75 Casey Schaufler 2015-07-22 2497 ad.a.u.net->family = PF_INET6; 21abb1ec414c75 Casey Schaufler 2015-07-22 @2498 ad.a.u.net->dport = ntohs(address->sin6_port); 21abb1ec414c75 Casey Schaufler 2015-07-22 2499 if (act == SMK_RECEIVING) 21abb1ec414c75 Casey Schaufler 2015-07-22 2500 ad.a.u.net->v6info.saddr = address->sin6_addr; 21abb1ec414c75 Casey Schaufler 2015-07-22 2501 else 21abb1ec414c75 Casey Schaufler 2015-07-22 2502 ad.a.u.net->v6info.daddr = address->sin6_addr; 21abb1ec414c75 Casey Schaufler 2015-07-22 2503 #endif 21abb1ec414c75 Casey Schaufler 2015-07-22 2504 rc = smk_access(subject, object, MAY_WRITE, &ad); 21abb1ec414c75 Casey Schaufler 2015-07-22 2505 rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc); 21abb1ec414c75 Casey Schaufler 2015-07-22 2506 return rc; 21abb1ec414c75 Casey Schaufler 2015-07-22 2507 } 21abb1ec414c75 Casey Schaufler 2015-07-22 2508 :::::: The code at line 2498 was first introduced by commit :::::: 21abb1ec414c75abe32c3854848ff30e2b4a6113 Smack: IPv6 host labeling :::::: TO: Casey Schaufler <casey(a)schaufler-ca.com&gt; :::::: CC: Casey Schaufler <casey(a)schaufler-ca.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org