tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: b670dd901cbbf97745380d373b1d2607b3235590 commit: c33e42836a745f2b3ab28bd6cb09c208cbcc950e [2165/30000] livepatch/core: Allow implementation without ftrace config: x86_64-randconfig-015-20240323 (https://download.01.org/0day-ci/archive/20240324/202403240050.7nMqX49L-lkp@i...) compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240324/202403240050.7nMqX49L-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202403240050.7nMqX49L-lkp@intel.com/ All warnings (new ones prefixed by >>): kernel/livepatch/core.c:1084:12: warning: no previous prototype for function 'klp_check_calltrace' [-Wmissing-prototypes] 1084 | int __weak klp_check_calltrace(struct klp_patch *patch, int enable) | ^ kernel/livepatch/core.c:1084:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 1084 | int __weak klp_check_calltrace(struct klp_patch *patch, int enable) | ^ | static kernel/livepatch/core.c:1107:27: error: incomplete definition of type 'struct patch_data' 1107 | if (atomic_inc_return(&pd->cpu_count) == 1) { | ~~^ kernel/livepatch/core.c:1105:9: note: forward declaration of 'struct patch_data' 1105 | struct patch_data *pd = (struct patch_data *)data; | ^ kernel/livepatch/core.c:1108:31: error: incomplete definition of type 'struct patch_data' 1108 | struct klp_patch *patch = pd->patch; | ~~^ kernel/livepatch/core.c:1105:9: note: forward declaration of 'struct patch_data' 1105 | struct patch_data *pd = (struct patch_data *)data; | ^ kernel/livepatch/core.c:1112:18: error: incomplete definition of type 'struct patch_data' 1112 | atomic_inc(&pd->cpu_count); | ~~^ kernel/livepatch/core.c:1105:9: note: forward declaration of 'struct patch_data' 1105 | struct patch_data *pd = (struct patch_data *)data; | ^ kernel/livepatch/core.c:1117:18: error: incomplete definition of type 'struct patch_data' 1117 | atomic_inc(&pd->cpu_count); | ~~^ kernel/livepatch/core.c:1105:9: note: forward declaration of 'struct patch_data' 1105 | struct patch_data *pd = (struct patch_data *)data; | ^ kernel/livepatch/core.c:1120:17: error: incomplete definition of type 'struct patch_data' 1120 | atomic_inc(&pd->cpu_count); | ~~^ kernel/livepatch/core.c:1105:9: note: forward declaration of 'struct patch_data' 1105 | struct patch_data *pd = (struct patch_data *)data; | ^ kernel/livepatch/core.c:1122:25: error: incomplete definition of type 'struct patch_data' 1122 | while (atomic_read(&pd->cpu_count) <= num_online_cpus()) | ~~^ kernel/livepatch/core.c:1105:9: note: forward declaration of 'struct patch_data' 1105 | struct patch_data *pd = (struct patch_data *)data; | ^

...

kernel/livepatch/core.c:1102:5: warning: no previous prototype for function 'klp_try_disable_patch' [-Wmissing-prototypes] 1102 | int klp_try_disable_patch(void *data) | ^ kernel/livepatch/core.c:1102:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 1102 | int klp_try_disable_patch(void *data) | ^ | static kernel/livepatch/core.c:1134:20: error: variable has incomplete type 'struct patch_data' 1134 | struct patch_data patch_data = { | ^ kernel/livepatch/core.c:1134:9: note: forward declaration of 'struct patch_data' 1134 | struct patch_data patch_data = { | ^ kernel/livepatch/core.c:1151:8: error: implicit declaration of function 'stop_machine' [-Werror,-Wimplicit-function-declaration] 1151 | ret = stop_machine(klp_try_disable_patch, &patch_data, cpu_online_mask); | ^ kernel/livepatch/core.c:1258:27: error: incomplete definition of type 'struct patch_data' 1258 | if (atomic_inc_return(&pd->cpu_count) == 1) { | ~~^ kernel/livepatch/core.c:1256:9: note: forward declaration of 'struct patch_data' 1256 | struct patch_data *pd = (struct patch_data *)data; | ^ kernel/livepatch/core.c:1259:31: error: incomplete definition of type 'struct patch_data' 1259 | struct klp_patch *patch = pd->patch; | ~~^ kernel/livepatch/core.c:1256:9: note: forward declaration of 'struct patch_data' 1256 | struct patch_data *pd = (struct patch_data *)data; | ^ kernel/livepatch/core.c:1263:18: error: incomplete definition of type 'struct patch_data' 1263 | atomic_inc(&pd->cpu_count); | ~~^ kernel/livepatch/core.c:1256:9: note: forward declaration of 'struct patch_data' 1256 | struct patch_data *pd = (struct patch_data *)data; | ^ kernel/livepatch/core.c:1268:18: error: incomplete definition of type 'struct patch_data' 1268 | atomic_inc(&pd->cpu_count); | ~~^ kernel/livepatch/core.c:1256:9: note: forward declaration of 'struct patch_data' 1256 | struct patch_data *pd = (struct patch_data *)data; | ^ kernel/livepatch/core.c:1271:17: error: incomplete definition of type 'struct patch_data' 1271 | atomic_inc(&pd->cpu_count); | ~~^ kernel/livepatch/core.c:1256:9: note: forward declaration of 'struct patch_data' 1256 | struct patch_data *pd = (struct patch_data *)data; | ^ kernel/livepatch/core.c:1273:25: error: incomplete definition of type 'struct patch_data' 1273 | while (atomic_read(&pd->cpu_count) <= num_online_cpus()) | ~~^ kernel/livepatch/core.c:1256:9: note: forward declaration of 'struct patch_data' 1256 | struct patch_data *pd = (struct patch_data *)data; | ^ kernel/livepatch/core.c:1253:5: warning: no previous prototype for function 'klp_try_enable_patch' [-Wmissing-prototypes] 1253 | int klp_try_enable_patch(void *data) | ^ kernel/livepatch/core.c:1253:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 1253 | int klp_try_enable_patch(void *data) | ^ | static kernel/livepatch/core.c:1285:20: error: variable has incomplete type 'struct patch_data' 1285 | struct patch_data patch_data = { | ^ kernel/livepatch/core.c:1285:9: note: forward declaration of 'struct patch_data' 1285 | struct patch_data patch_data = { | ^ kernel/livepatch/core.c:1302:8: error: implicit declaration of function 'stop_machine' [-Werror,-Wimplicit-function-declaration] 1302 | ret = stop_machine(klp_try_enable_patch, &patch_data, cpu_online_mask); | ^ 3 warnings and 16 errors generated.

vim +/klp_try_disable_patch +1102 kernel/livepatch/core.c 1101

1102 int klp_try_disable_patch(void *data) 1103 { 1104 int ret = 0; 1105 struct patch_data *pd = (struct patch_data *)data; 1106 1107 if (atomic_inc_return(&pd->cpu_count) == 1) { 1108 struct klp_patch *patch = pd->patch; 1109 1110 ret = klp_check_calltrace(patch, 0); 1111 if (ret) { 1112 atomic_inc(&pd->cpu_count); 1113 return ret; 1114 } 1115 ret = disable_patch(patch); 1116 if (ret) { 1117 atomic_inc(&pd->cpu_count); 1118 return ret; 1119 } 1120 atomic_inc(&pd->cpu_count); 1121 } else { 1122 while (atomic_read(&pd->cpu_count) <= num_online_cpus()) 1123 cpu_relax(); 1124 1125 klp_smp_isb(); 1126 } 1127 1128 return ret; 1129 } 1130 1131 static int __klp_disable_patch(struct klp_patch *patch) 1132 { 1133 int ret; 1134 struct patch_data patch_data = { 1135 .patch = patch, 1136 .cpu_count = ATOMIC_INIT(0), 1137 }; 1138 1139 if (WARN_ON(!patch->enabled)) 1140 return -EINVAL; 1141 1142 #ifdef CONFIG_LIVEPATCH_STACK 1143 /* enforce stacking: only the last enabled patch can be disabled */ 1144 if (!list_is_last(&patch->list, &klp_patches) && 1145 list_next_entry(patch, list)->enabled) { 1146 pr_err("only the last enabled patch can be disabled\n"); 1147 return -EBUSY; 1148 } 1149 #endif 1150 1151 ret = stop_machine(klp_try_disable_patch, &patch_data, cpu_online_mask); 1152 if (ret) 1153 return ret; 1154 1155 klp_free_patch_async(patch); 1156 return 0; 1157 } 1158 #endif /* ifdef CONFIG_LIVEPATCH_FTRACE */ 1159 1160 #ifdef CONFIG_LIVEPATCH_FTRACE 1161 static int __klp_enable_patch(struct klp_patch *patch) 1162 { 1163 struct klp_object *obj; 1164 int ret; 1165 1166 if (klp_transition_patch) 1167 return -EBUSY; 1168 1169 if (WARN_ON(patch->enabled)) 1170 return -EINVAL; 1171 1172 pr_notice("enabling patch '%s'\n", patch->mod->name); 1173 1174 klp_init_transition(patch, KLP_PATCHED); 1175 1176 /* 1177 * Enforce the order of the func->transition writes in 1178 * klp_init_transition() and the ops->func_stack writes in 1179 * klp_patch_object(), so that klp_ftrace_handler() will see the 1180 * func->transition updates before the handler is registered and the 1181 * new funcs become visible to the handler. 1182 */ 1183 smp_wmb(); 1184 1185 klp_for_each_object(patch, obj) { 1186 if (!klp_is_object_loaded(obj)) 1187 continue; 1188 1189 ret = klp_pre_patch_callback(obj); 1190 if (ret) { 1191 pr_warn("pre-patch callback failed for object '%s'\n", 1192 klp_is_module(obj) ? obj->name : "vmlinux"); 1193 goto err; 1194 } 1195 1196 ret = klp_patch_object(obj); 1197 if (ret) { 1198 pr_warn("failed to patch object '%s'\n", 1199 klp_is_module(obj) ? obj->name : "vmlinux"); 1200 goto err; 1201 } 1202 } 1203 1204 klp_start_transition(); 1205 patch->enabled = true; 1206 klp_try_complete_transition(); 1207 1208 return 0; 1209 err: 1210 pr_warn("failed to enable patch '%s'\n", patch->mod->name); 1211 1212 klp_cancel_transition(); 1213 return ret; 1214 } 1215 #else /* ifdef CONFIG_LIVEPATCH_WO_FTRACE */ 1216 /* 1217 * This function is called from stop_machine() context. 1218 */ 1219 static int enable_patch(struct klp_patch *patch) 1220 { 1221 struct klp_object *obj; 1222 int ret; 1223 1224 pr_notice_once("tainting kernel with TAINT_LIVEPATCH\n"); 1225 add_taint(TAINT_LIVEPATCH, LOCKDEP_STILL_OK); 1226 1227 if (!try_module_get(patch->mod)) 1228 return -ENODEV; 1229 1230 patch->enabled = true; 1231 1232 pr_notice("enabling patch '%s'\n", patch->mod->name); 1233 1234 klp_for_each_object(patch, obj) { 1235 if (!klp_is_object_loaded(obj)) 1236 continue; 1237 1238 ret = klp_patch_object(obj); 1239 if (ret) { 1240 pr_warn("failed to patch object '%s'\n", 1241 klp_is_module(obj) ? obj->name : "vmlinux"); 1242 goto disable; 1243 } 1244 } 1245 1246 return 0; 1247 1248 disable: 1249 disable_patch(patch); 1250 return ret; 1251 } 1252 1253 int klp_try_enable_patch(void *data) 1254 { 1255 int ret = 0; 1256 struct patch_data *pd = (struct patch_data *)data; 1257 1258 if (atomic_inc_return(&pd->cpu_count) == 1) { 1259 struct klp_patch *patch = pd->patch; 1260 1261 ret = klp_check_calltrace(patch, 1); 1262 if (ret) { 1263 atomic_inc(&pd->cpu_count); 1264 return ret; 1265 } 1266 ret = enable_patch(patch); 1267 if (ret) { 1268 atomic_inc(&pd->cpu_count); 1269 return ret; 1270 } 1271 atomic_inc(&pd->cpu_count); 1272 } else { 1273 while (atomic_read(&pd->cpu_count) <= num_online_cpus()) 1274 cpu_relax(); 1275 1276 klp_smp_isb(); 1277 } 1278 1279 return ret; 1280 } 1281

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