Hi Jakub, I love your patch! Perhaps something to improve: [auto build test WARNING on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Jakub-Sitnicki/Split-bpf_sk_look... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: sparc-randconfig-s031-20220207 (https://download.01.org/0day-ci/archive/20220208/202202080631.n8UjqRXy-lk...) compiler: sparc64-linux-gcc (GCC) 11.2.0 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: v0.6.4-dirty # https://github.com/0day-ci/linux/commit/b859a90e4c32a55e71d2731dd8dae96d7... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Jakub-Sitnicki/Split-bpf_sk_lookup-remote_port-field/20220207-215137 git checkout b859a90e4c32a55e71d2731dd8dae96d7ad1defe # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc SHELL=/bin/bash net/bpf/ 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 >>) vim +1149 net/bpf/test_run.c 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1111 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1112 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, const union bpf_attr *kattr, 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1113 union bpf_attr __user *uattr) 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1114 { 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1115 struct bpf_test_timer t = { NO_PREEMPT }; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1116 struct bpf_prog_array *progs = NULL; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1117 struct bpf_sk_lookup_kern ctx = {}; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1118 u32 repeat = kattr->test.repeat; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1119 struct bpf_sk_lookup *user_ctx; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1120 u32 retval, duration; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1121 int ret = -EINVAL; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1122 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1123 if (prog->type != BPF_PROG_TYPE_SK_LOOKUP) 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1124 return -EINVAL; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1125 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1126 if (kattr->test.flags || kattr->test.cpu) 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1127 return -EINVAL; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1128 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1129 if (kattr->test.data_in || kattr->test.data_size_in || kattr->test.data_out || 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1130 kattr->test.data_size_out) 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1131 return -EINVAL; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1132 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1133 if (!repeat) 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1134 repeat = 1; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1135 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1136 user_ctx = bpf_ctx_init(kattr, sizeof(*user_ctx)); 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1137 if (IS_ERR(user_ctx)) 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1138 return PTR_ERR(user_ctx); 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1139 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1140 if (!user_ctx) 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1141 return -EINVAL; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1142 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1143 if (user_ctx->sk) 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1144 goto out; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1145 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1146 if (!range_is_zero(user_ctx, offsetofend(typeof(*user_ctx), local_port), sizeof(*user_ctx))) 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1147 goto out; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1148 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 @1149 if (user_ctx->local_port > U16_MAX || user_ctx->remote_port > U16_MAX) { 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1150 ret = -ERANGE; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1151 goto out; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1152 } 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1153 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1154 ctx.family = (u16)user_ctx->family; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1155 ctx.protocol = (u16)user_ctx->protocol; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1156 ctx.dport = (u16)user_ctx->local_port; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1157 ctx.sport = (__force __be16)user_ctx->remote_port; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1158 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1159 switch (ctx.family) { 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1160 case AF_INET: 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1161 ctx.v4.daddr = (__force __be32)user_ctx->local_ip4; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1162 ctx.v4.saddr = (__force __be32)user_ctx->remote_ip4; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1163 break; 7c32e8f8bc33a5f Lorenz Bauer 2021-03-03 1164 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org