1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 #ifndef _LINUX_TRACEPOINT_H 3 #define _LINUX_TRACEPOINT_H 4 5 /* 6 * Kernel Tracepoint API. 7 * 8 * See Documentation/trace/tracepoints.rst. 9 * 10 * Copyright (C) 2008-2014 Mathieu Desnoyers <[email protected]> 11 * 12 * Heavily inspired from the Linux Kernel Markers. 13 */ 14 15 #include <linux/smp.h> 16 #include <linux/srcu.h> 17 #include <linux/errno.h> 18 #include <linux/types.h> 19 #include <linux/rcupdate.h> 20 #include <linux/rcupdate_trace.h> 21 #include <linux/tracepoint-defs.h> 22 #include <linux/static_call.h> 23 24 struct module; 25 struct tracepoint; 26 struct notifier_block; 27 28 struct trace_eval_map { 29 const char *system; 30 const char *eval_string; 31 unsigned long eval_value; 32 }; 33 34 #define TRACEPOINT_DEFAULT_PRIO 10 35 36 extern int 37 tracepoint_probe_register(struct tracepoint *tp, void *probe, void *data); 38 extern int 39 tracepoint_probe_register_prio(struct tracepoint *tp, void *probe, void *data, 40 int prio); 41 extern int 42 tracepoint_probe_register_prio_may_exist(struct tracepoint *tp, void *probe, void *data, 43 int prio); 44 extern int 45 tracepoint_probe_unregister(struct tracepoint *tp, void *probe, void *data); 46 static inline int 47 tracepoint_probe_register_may_exist(struct tracepoint *tp, void *probe, 48 void *data) 49 { 50 return tracepoint_probe_register_prio_may_exist(tp, probe, data, 51 TRACEPOINT_DEFAULT_PRIO); 52 } 53 extern void 54 for_each_kernel_tracepoint(void (*fct)(struct tracepoint *tp, void *priv), 55 void *priv); 56 57 #ifdef CONFIG_MODULES 58 struct tp_module { 59 struct list_head list; 60 struct module *mod; 61 }; 62 63 bool trace_module_has_bad_taint(struct module *mod); 64 extern int register_tracepoint_module_notifier(struct notifier_block *nb); 65 extern int unregister_tracepoint_module_notifier(struct notifier_block *nb); 66 void for_each_module_tracepoint(void (*fct)(struct tracepoint *, 67 struct module *, void *), 68 void *priv); 69 void for_each_tracepoint_in_module(struct module *, 70 void (*fct)(struct tracepoint *, 71 struct module *, void *), 72 void *priv); 73 #else 74 static inline bool trace_module_has_bad_taint(struct module *mod) 75 { 76 return false; 77 } 78 static inline 79 int register_tracepoint_module_notifier(struct notifier_block *nb) 80 { 81 return 0; 82 } 83 static inline 84 int unregister_tracepoint_module_notifier(struct notifier_block *nb) 85 { 86 return 0; 87 } 88 static inline 89 void for_each_module_tracepoint(void (*fct)(struct tracepoint *, 90 struct module *, void *), 91 void *priv) 92 { 93 } 94 static inline 95 void for_each_tracepoint_in_module(struct module *mod, 96 void (*fct)(struct tracepoint *, 97 struct module *, void *), 98 void *priv) 99 { 100 } 101 #endif /* CONFIG_MODULES */ 102 103 /* 104 * tracepoint_synchronize_unregister must be called between the last tracepoint 105 * probe unregistration and the end of module exit to make sure there is no 106 * caller executing a probe when it is freed. 107 * 108 * An alternative is to use the following for batch reclaim associated 109 * with a given tracepoint: 110 * 111 * - tracepoint_is_faultable() == false: call_rcu() 112 * - tracepoint_is_faultable() == true: call_rcu_tasks_trace() 113 */ 114 #ifdef CONFIG_TRACEPOINTS 115 static inline void tracepoint_synchronize_unregister(void) 116 { 117 synchronize_rcu_tasks_trace(); 118 synchronize_rcu(); 119 } 120 static inline bool tracepoint_is_faultable(struct tracepoint *tp) 121 { 122 return tp->ext && tp->ext->faultable; 123 } 124 #else 125 static inline void tracepoint_synchronize_unregister(void) 126 { } 127 static inline bool tracepoint_is_faultable(struct tracepoint *tp) 128 { 129 return false; 130 } 131 #endif 132 133 #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS 134 extern int syscall_regfunc(void); 135 extern void syscall_unregfunc(void); 136 #endif /* CONFIG_HAVE_SYSCALL_TRACEPOINTS */ 137 138 #ifndef PARAMS 139 #define PARAMS(args...) args 140 #endif 141 142 #define TRACE_DEFINE_ENUM(x) 143 #define TRACE_DEFINE_SIZEOF(x) 144 145 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS 146 static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p) 147 { 148 return offset_to_ptr(p); 149 } 150 151 #define __TRACEPOINT_ENTRY(name) \ 152 asm(" .section \"__tracepoints_ptrs\", \"a\" \n" \ 153 " .balign 4 \n" \ 154 " .long __tracepoint_" #name " - . \n" \ 155 " .previous \n") 156 #else 157 static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p) 158 { 159 return *p; 160 } 161 162 #define __TRACEPOINT_ENTRY(name) \ 163 static tracepoint_ptr_t __tracepoint_ptr_##name __used \ 164 __section("__tracepoints_ptrs") = &__tracepoint_##name 165 #endif 166 167 #endif /* _LINUX_TRACEPOINT_H */ 168 169 /* 170 * Note: we keep the TRACE_EVENT and DECLARE_TRACE outside the include 171 * file ifdef protection. 172 * This is due to the way trace events work. If a file includes two 173 * trace event headers under one "CREATE_TRACE_POINTS" the first include 174 * will override the TRACE_EVENT and break the second include. 175 */ 176 177 #ifndef DECLARE_TRACE 178 179 #define TP_PROTO(args...) args 180 #define TP_ARGS(args...) args 181 #define TP_CONDITION(args...) args 182 183 /* 184 * Individual subsystem my have a separate configuration to 185 * enable their tracepoints. By default, this file will create 186 * the tracepoints if CONFIG_TRACEPOINTS is defined. If a subsystem 187 * wants to be able to disable its tracepoints from being created 188 * it can define NOTRACE before including the tracepoint headers. 189 */ 190 #if defined(CONFIG_TRACEPOINTS) && !defined(NOTRACE) 191 #define TRACEPOINTS_ENABLED 192 #endif 193 194 #ifdef TRACEPOINTS_ENABLED 195 196 #ifdef CONFIG_HAVE_STATIC_CALL 197 #define __DO_TRACE_CALL(name, args) \ 198 do { \ 199 struct tracepoint_func *it_func_ptr; \ 200 void *__data; \ 201 it_func_ptr = \ 202 rcu_dereference_raw((&__tracepoint_##name)->funcs); \ 203 if (it_func_ptr) { \ 204 __data = (it_func_ptr)->data; \ 205 static_call(tp_func_##name)(__data, args); \ 206 } \ 207 } while (0) 208 #else 209 #define __DO_TRACE_CALL(name, args) __traceiter_##name(NULL, args) 210 #endif /* CONFIG_HAVE_STATIC_CALL */ 211 212 /* 213 * Declare an exported function that Rust code can call to trigger this 214 * tracepoint. This function does not include the static branch; that is done 215 * in Rust to avoid a function call when the tracepoint is disabled. 216 */ 217 #define DEFINE_RUST_DO_TRACE(name, proto, args) 218 #define __DEFINE_RUST_DO_TRACE(name, proto, args) \ 219 notrace void rust_do_trace_##name(proto) \ 220 { \ 221 __do_trace_##name(args); \ 222 } 223 224 /* 225 * Make sure the alignment of the structure in the __tracepoints section will 226 * not add unwanted padding between the beginning of the section and the 227 * structure. Force alignment to the same alignment as the section start. 228 * 229 * When lockdep is enabled, we make sure to always test if RCU is 230 * "watching" regardless if the tracepoint is enabled or not. Tracepoints 231 * require RCU to be active, and it should always warn at the tracepoint 232 * site if it is not watching, as it will need to be active when the 233 * tracepoint is enabled. 234 */ 235 #define __DECLARE_TRACE_COMMON(name, proto, args, data_proto) \ 236 extern int __traceiter_##name(data_proto); \ 237 DECLARE_STATIC_CALL(tp_func_##name, __traceiter_##name); \ 238 extern struct tracepoint __tracepoint_##name; \ 239 extern void rust_do_trace_##name(proto); \ 240 static inline int \ 241 register_trace_##name(void (*probe)(data_proto), void *data) \ 242 { \ 243 return tracepoint_probe_register(&__tracepoint_##name, \ 244 (void *)probe, data); \ 245 } \ 246 static inline int \ 247 register_trace_prio_##name(void (*probe)(data_proto), void *data,\ 248 int prio) \ 249 { \ 250 return tracepoint_probe_register_prio(&__tracepoint_##name, \ 251 (void *)probe, data, prio); \ 252 } \ 253 static inline int \ 254 unregister_trace_##name(void (*probe)(data_proto), void *data) \ 255 { \ 256 return tracepoint_probe_unregister(&__tracepoint_##name,\ 257 (void *)probe, data); \ 258 } \ 259 static inline void \ 260 check_trace_callback_type_##name(void (*cb)(data_proto)) \ 261 { \ 262 } \ 263 static inline bool \ 264 trace_##name##_enabled(void) \ 265 { \ 266 return static_branch_unlikely(&__tracepoint_##name.key);\ 267 } 268 269 #define __DECLARE_TRACE(name, proto, args, cond, data_proto) \ 270 __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto)) \ 271 static inline void __do_trace_##name(proto) \ 272 { \ 273 if (cond) { \ 274 guard(preempt_notrace)(); \ 275 __DO_TRACE_CALL(name, TP_ARGS(args)); \ 276 } \ 277 } \ 278 static inline void trace_##name(proto) \ 279 { \ 280 if (static_branch_unlikely(&__tracepoint_##name.key)) \ 281 __do_trace_##name(args); \ 282 if (IS_ENABLED(CONFIG_LOCKDEP) && (cond)) { \ 283 WARN_ONCE(!rcu_is_watching(), \ 284 "RCU not watching for tracepoint"); \ 285 } \ 286 } 287 288 #define __DECLARE_TRACE_SYSCALL(name, proto, args, data_proto) \ 289 __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto)) \ 290 static inline void __do_trace_##name(proto) \ 291 { \ 292 guard(rcu_tasks_trace)(); \ 293 __DO_TRACE_CALL(name, TP_ARGS(args)); \ 294 } \ 295 static inline void trace_##name(proto) \ 296 { \ 297 might_fault(); \ 298 if (static_branch_unlikely(&__tracepoint_##name.key)) \ 299 __do_trace_##name(args); \ 300 if (IS_ENABLED(CONFIG_LOCKDEP)) { \ 301 WARN_ONCE(!rcu_is_watching(), \ 302 "RCU not watching for tracepoint"); \ 303 } \ 304 } 305 306 /* 307 * We have no guarantee that gcc and the linker won't up-align the tracepoint 308 * structures, so we create an array of pointers that will be used for iteration 309 * on the tracepoints. 310 * 311 * it_func[0] is never NULL because there is at least one element in the array 312 * when the array itself is non NULL. 313 */ 314 #define __DEFINE_TRACE_EXT(_name, _ext, proto, args) \ 315 static const char __tpstrtab_##_name[] \ 316 __section("__tracepoints_strings") = #_name; \ 317 extern struct static_call_key STATIC_CALL_KEY(tp_func_##_name); \ 318 int __traceiter_##_name(void *__data, proto); \ 319 void __probestub_##_name(void *__data, proto); \ 320 struct tracepoint __tracepoint_##_name __used \ 321 __section("__tracepoints") = { \ 322 .name = __tpstrtab_##_name, \ 323 .key = STATIC_KEY_FALSE_INIT, \ 324 .static_call_key = &STATIC_CALL_KEY(tp_func_##_name), \ 325 .static_call_tramp = STATIC_CALL_TRAMP_ADDR(tp_func_##_name), \ 326 .iterator = &__traceiter_##_name, \ 327 .probestub = &__probestub_##_name, \ 328 .funcs = NULL, \ 329 .ext = _ext, \ 330 }; \ 331 __TRACEPOINT_ENTRY(_name); \ 332 int __traceiter_##_name(void *__data, proto) \ 333 { \ 334 struct tracepoint_func *it_func_ptr; \ 335 void *it_func; \ 336 \ 337 it_func_ptr = \ 338 rcu_dereference_raw((&__tracepoint_##_name)->funcs); \ 339 if (it_func_ptr) { \ 340 do { \ 341 it_func = READ_ONCE((it_func_ptr)->func); \ 342 __data = (it_func_ptr)->data; \ 343 ((void(*)(void *, proto))(it_func))(__data, args); \ 344 } while ((++it_func_ptr)->func); \ 345 } \ 346 return 0; \ 347 } \ 348 void __probestub_##_name(void *__data, proto) \ 349 { \ 350 } \ 351 DEFINE_STATIC_CALL(tp_func_##_name, __traceiter_##_name); \ 352 DEFINE_RUST_DO_TRACE(_name, TP_PROTO(proto), TP_ARGS(args)) 353 354 #define DEFINE_TRACE_FN(_name, _reg, _unreg, _proto, _args) \ 355 static struct tracepoint_ext __tracepoint_ext_##_name = { \ 356 .regfunc = _reg, \ 357 .unregfunc = _unreg, \ 358 .faultable = false, \ 359 }; \ 360 __DEFINE_TRACE_EXT(_name, &__tracepoint_ext_##_name, PARAMS(_proto), PARAMS(_args)); 361 362 #define DEFINE_TRACE_SYSCALL(_name, _reg, _unreg, _proto, _args) \ 363 static struct tracepoint_ext __tracepoint_ext_##_name = { \ 364 .regfunc = _reg, \ 365 .unregfunc = _unreg, \ 366 .faultable = true, \ 367 }; \ 368 __DEFINE_TRACE_EXT(_name, &__tracepoint_ext_##_name, PARAMS(_proto), PARAMS(_args)); 369 370 #define DEFINE_TRACE(_name, _proto, _args) \ 371 __DEFINE_TRACE_EXT(_name, NULL, PARAMS(_proto), PARAMS(_args)); 372 373 #define EXPORT_TRACEPOINT_SYMBOL_GPL(name) \ 374 EXPORT_SYMBOL_GPL(__tracepoint_##name); \ 375 EXPORT_SYMBOL_GPL(__traceiter_##name); \ 376 EXPORT_STATIC_CALL_GPL(tp_func_##name) 377 #define EXPORT_TRACEPOINT_SYMBOL(name) \ 378 EXPORT_SYMBOL(__tracepoint_##name); \ 379 EXPORT_SYMBOL(__traceiter_##name); \ 380 EXPORT_STATIC_CALL(tp_func_##name) 381 382 383 #else /* !TRACEPOINTS_ENABLED */ 384 #define __DECLARE_TRACE_COMMON(name, proto, args, data_proto) \ 385 static inline void trace_##name(proto) \ 386 { } \ 387 static inline int \ 388 register_trace_##name(void (*probe)(data_proto), \ 389 void *data) \ 390 { \ 391 return -ENOSYS; \ 392 } \ 393 static inline int \ 394 unregister_trace_##name(void (*probe)(data_proto), \ 395 void *data) \ 396 { \ 397 return -ENOSYS; \ 398 } \ 399 static inline void check_trace_callback_type_##name(void (*cb)(data_proto)) \ 400 { \ 401 } \ 402 static inline bool \ 403 trace_##name##_enabled(void) \ 404 { \ 405 return false; \ 406 } 407 408 #define __DECLARE_TRACE(name, proto, args, cond, data_proto) \ 409 __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto)) 410 411 #define __DECLARE_TRACE_SYSCALL(name, proto, args, data_proto) \ 412 __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto)) 413 414 #define DEFINE_TRACE_FN(name, reg, unreg, proto, args) 415 #define DEFINE_TRACE_SYSCALL(name, reg, unreg, proto, args) 416 #define DEFINE_TRACE(name, proto, args) 417 #define EXPORT_TRACEPOINT_SYMBOL_GPL(name) 418 #define EXPORT_TRACEPOINT_SYMBOL(name) 419 420 #endif /* TRACEPOINTS_ENABLED */ 421 422 #ifdef CONFIG_TRACING 423 /** 424 * tracepoint_string - register constant persistent string to trace system 425 * @str - a constant persistent string that will be referenced in tracepoints 426 * 427 * If constant strings are being used in tracepoints, it is faster and 428 * more efficient to just save the pointer to the string and reference 429 * that with a printf "%s" instead of saving the string in the ring buffer 430 * and wasting space and time. 431 * 432 * The problem with the above approach is that userspace tools that read 433 * the binary output of the trace buffers do not have access to the string. 434 * Instead they just show the address of the string which is not very 435 * useful to users. 436 * 437 * With tracepoint_string(), the string will be registered to the tracing 438 * system and exported to userspace via the debugfs/tracing/printk_formats 439 * file that maps the string address to the string text. This way userspace 440 * tools that read the binary buffers have a way to map the pointers to 441 * the ASCII strings they represent. 442 * 443 * The @str used must be a constant string and persistent as it would not 444 * make sense to show a string that no longer exists. But it is still fine 445 * to be used with modules, because when modules are unloaded, if they 446 * had tracepoints, the ring buffers are cleared too. As long as the string 447 * does not change during the life of the module, it is fine to use 448 * tracepoint_string() within a module. 449 */ 450 #define tracepoint_string(str) \ 451 ({ \ 452 static const char *___tp_str __tracepoint_string = str; \ 453 ___tp_str; \ 454 }) 455 #define __tracepoint_string __used __section("__tracepoint_str") 456 #else 457 /* 458 * tracepoint_string() is used to save the string address for userspace 459 * tracing tools. When tracing isn't configured, there's no need to save 460 * anything. 461 */ 462 # define tracepoint_string(str) str 463 # define __tracepoint_string 464 #endif 465 466 #define DECLARE_TRACE(name, proto, args) \ 467 __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \ 468 cpu_online(raw_smp_processor_id()), \ 469 PARAMS(void *__data, proto)) 470 471 #define DECLARE_TRACE_CONDITION(name, proto, args, cond) \ 472 __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \ 473 cpu_online(raw_smp_processor_id()) && (PARAMS(cond)), \ 474 PARAMS(void *__data, proto)) 475 476 #define DECLARE_TRACE_SYSCALL(name, proto, args) \ 477 __DECLARE_TRACE_SYSCALL(name, PARAMS(proto), PARAMS(args), \ 478 PARAMS(void *__data, proto)) 479 480 #define TRACE_EVENT_FLAGS(event, flag) 481 482 #define TRACE_EVENT_PERF_PERM(event, expr...) 483 484 #endif /* DECLARE_TRACE */ 485 486 #ifndef TRACE_EVENT 487 /* 488 * For use with the TRACE_EVENT macro: 489 * 490 * We define a tracepoint, its arguments, its printk format 491 * and its 'fast binary record' layout. 492 * 493 * Firstly, name your tracepoint via TRACE_EVENT(name : the 494 * 'subsystem_event' notation is fine. 495 * 496 * Think about this whole construct as the 497 * 'trace_sched_switch() function' from now on. 498 * 499 * 500 * TRACE_EVENT(sched_switch, 501 * 502 * * 503 * * A function has a regular function arguments 504 * * prototype, declare it via TP_PROTO(): 505 * * 506 * 507 * TP_PROTO(struct rq *rq, struct task_struct *prev, 508 * struct task_struct *next), 509 * 510 * * 511 * * Define the call signature of the 'function'. 512 * * (Design sidenote: we use this instead of a 513 * * TP_PROTO1/TP_PROTO2/TP_PROTO3 ugliness.) 514 * * 515 * 516 * TP_ARGS(rq, prev, next), 517 * 518 * * 519 * * Fast binary tracing: define the trace record via 520 * * TP_STRUCT__entry(). You can think about it like a 521 * * regular C structure local variable definition. 522 * * 523 * * This is how the trace record is structured and will 524 * * be saved into the ring buffer. These are the fields 525 * * that will be exposed to user-space in 526 * * /sys/kernel/tracing/events/<*>/format. 527 * * 528 * * The declared 'local variable' is called '__entry' 529 * * 530 * * __field(pid_t, prev_pid) is equivalent to a standard declaration: 531 * * 532 * * pid_t prev_pid; 533 * * 534 * * __array(char, prev_comm, TASK_COMM_LEN) is equivalent to: 535 * * 536 * * char prev_comm[TASK_COMM_LEN]; 537 * * 538 * 539 * TP_STRUCT__entry( 540 * __array( char, prev_comm, TASK_COMM_LEN ) 541 * __field( pid_t, prev_pid ) 542 * __field( int, prev_prio ) 543 * __array( char, next_comm, TASK_COMM_LEN ) 544 * __field( pid_t, next_pid ) 545 * __field( int, next_prio ) 546 * ), 547 * 548 * * 549 * * Assign the entry into the trace record, by embedding 550 * * a full C statement block into TP_fast_assign(). You 551 * * can refer to the trace record as '__entry' - 552 * * otherwise you can put arbitrary C code in here. 553 * * 554 * * Note: this C code will execute every time a trace event 555 * * happens, on an active tracepoint. 556 * * 557 * 558 * TP_fast_assign( 559 * memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN); 560 * __entry->prev_pid = prev->pid; 561 * __entry->prev_prio = prev->prio; 562 * memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN); 563 * __entry->next_pid = next->pid; 564 * __entry->next_prio = next->prio; 565 * ), 566 * 567 * * 568 * * Formatted output of a trace record via TP_printk(). 569 * * This is how the tracepoint will appear under ftrace 570 * * plugins that make use of this tracepoint. 571 * * 572 * * (raw-binary tracing wont actually perform this step.) 573 * * 574 * 575 * TP_printk("task %s:%d [%d] ==> %s:%d [%d]", 576 * __entry->prev_comm, __entry->prev_pid, __entry->prev_prio, 577 * __entry->next_comm, __entry->next_pid, __entry->next_prio), 578 * 579 * ); 580 * 581 * This macro construct is thus used for the regular printk format 582 * tracing setup, it is used to construct a function pointer based 583 * tracepoint callback (this is used by programmatic plugins and 584 * can also by used by generic instrumentation like SystemTap), and 585 * it is also used to expose a structured trace record in 586 * /sys/kernel/tracing/events/. 587 * 588 * A set of (un)registration functions can be passed to the variant 589 * TRACE_EVENT_FN to perform any (un)registration work. 590 */ 591 592 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) 593 #define DEFINE_EVENT(template, name, proto, args) \ 594 DECLARE_TRACE(name, PARAMS(proto), PARAMS(args)) 595 #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)\ 596 DECLARE_TRACE(name, PARAMS(proto), PARAMS(args)) 597 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ 598 DECLARE_TRACE(name, PARAMS(proto), PARAMS(args)) 599 #define DEFINE_EVENT_CONDITION(template, name, proto, \ 600 args, cond) \ 601 DECLARE_TRACE_CONDITION(name, PARAMS(proto), \ 602 PARAMS(args), PARAMS(cond)) 603 604 #define TRACE_EVENT(name, proto, args, struct, assign, print) \ 605 DECLARE_TRACE(name, PARAMS(proto), PARAMS(args)) 606 #define TRACE_EVENT_FN(name, proto, args, struct, \ 607 assign, print, reg, unreg) \ 608 DECLARE_TRACE(name, PARAMS(proto), PARAMS(args)) 609 #define TRACE_EVENT_FN_COND(name, proto, args, cond, struct, \ 610 assign, print, reg, unreg) \ 611 DECLARE_TRACE_CONDITION(name, PARAMS(proto), \ 612 PARAMS(args), PARAMS(cond)) 613 #define TRACE_EVENT_CONDITION(name, proto, args, cond, \ 614 struct, assign, print) \ 615 DECLARE_TRACE_CONDITION(name, PARAMS(proto), \ 616 PARAMS(args), PARAMS(cond)) 617 #define TRACE_EVENT_SYSCALL(name, proto, args, struct, assign, \ 618 print, reg, unreg) \ 619 DECLARE_TRACE_SYSCALL(name, PARAMS(proto), PARAMS(args)) 620 621 #define TRACE_EVENT_FLAGS(event, flag) 622 623 #define TRACE_EVENT_PERF_PERM(event, expr...) 624 625 #define DECLARE_EVENT_NOP(name, proto, args) \ 626 static inline void trace_##name(proto) \ 627 { } \ 628 static inline bool trace_##name##_enabled(void) \ 629 { \ 630 return false; \ 631 } 632 633 #define TRACE_EVENT_NOP(name, proto, args, struct, assign, print) \ 634 DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args)) 635 636 #define DECLARE_EVENT_CLASS_NOP(name, proto, args, tstruct, assign, print) 637 #define DEFINE_EVENT_NOP(template, name, proto, args) \ 638 DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args)) 639 640 #endif /* ifdef TRACE_EVENT (see note above) */ 641