Hi "Toke, I love your patch! Perhaps something to improve: [auto build test WARNING on net-next/master] url: https://github.com/0day-ci/linux/commits/Toke-H-iland-J-rgensen/inet_ecn-... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 51e13685bd93654e0e9b2559c8e103d6545ddf95 config: i386-randconfig-s001-20201209 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-179-ga00755aa-dirty # https://github.com/0day-ci/linux/commit/30ca3d0f48b3d72f9ca0a3509eb639564... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Toke-H-iland-J-rgensen/inet_ecn-Use-csum16_add-helper-for-IP_ECN_set_-helpers/20201211-071305 git checkout 30ca3d0f48b3d72f9ca0a3509eb63956484d02ad # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 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/sched/sch_fq.c: note: in included file (through include/net/tcp.h): include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int -- net/sched/sch_sfq.c: note: in included file (through include/net/red.h): include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int -- net/sched/sch_sfb.c: note: in included file: include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int -- net/sched/sch_fq_codel.c: note: in included file (through include/net/codel.h): include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int -- net/sched/sch_choke.c: note: in included file: include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int -- net/sched/sch_codel.c: note: in included file (through include/net/codel.h): include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int -- net/sched/sch_red.c: note: in included file: include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int -- net/sched/sch_netem.c: note: in included file: include/net/inet_ecn.h:97:21: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:37: sparse: sparse: restricted __be16 degrades to integer include/net/inet_ecn.h:97:19: sparse: expected restricted __be16 [usertype] check_add include/net/inet_ecn.h:97:19: sparse: got int vim +97 include/net/inet_ecn.h 67 68 #define IP6_ECN_flow_init(label) do { \ 69 (label) &= ~htonl(INET_ECN_MASK << 20); \ 70 } while (0) 71 72 #define IP6_ECN_flow_xmit(sk, label) do { \ 73 if (INET_ECN_is_capable(inet6_sk(sk)->tclass)) \ 74 (label) |= htonl(INET_ECN_ECT_0 << 20); \ 75 } while (0) 76 77 static inline int IP_ECN_set_ce(struct iphdr *iph) 78 { 79 u32 ecn = (iph->tos + 1) & INET_ECN_MASK; 80 __be16 check_add; 81 82 /* 83 * After the last operation we have (in binary): 84 * INET_ECN_NOT_ECT => 01 85 * INET_ECN_ECT_1 => 10 86 * INET_ECN_ECT_0 => 11 87 * INET_ECN_CE => 00 88 */ 89 if (!(ecn & 2)) 90 return !ecn; 91 92 /* 93 * The following gives us: 94 * INET_ECN_ECT_1 => check += htons(0xFFFD) 95 * INET_ECN_ECT_0 => check += htons(0xFFFE) 96 */ 98 99 iph->check = csum16_add(iph->check, check_add); 100 iph->tos |= INET_ECN_CE; 101 return 1; 102 } 103 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org