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 <mathieu.desnoyers@efficios.com>
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
tracepoint_probe_register_may_exist(struct tracepoint * tp,void * probe,void * data)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
trace_module_has_bad_taint(struct module * mod)74 static inline bool trace_module_has_bad_taint(struct module *mod)
75 {
76 return false;
77 }
78 static inline
register_tracepoint_module_notifier(struct notifier_block * nb)79 int register_tracepoint_module_notifier(struct notifier_block *nb)
80 {
81 return 0;
82 }
83 static inline
unregister_tracepoint_module_notifier(struct notifier_block * nb)84 int unregister_tracepoint_module_notifier(struct notifier_block *nb)
85 {
86 return 0;
87 }
88 static inline
for_each_module_tracepoint(void (* fct)(struct tracepoint *,struct module *,void *),void * priv)89 void for_each_module_tracepoint(void (*fct)(struct tracepoint *,
90 struct module *, void *),
91 void *priv)
92 {
93 }
94 static inline
for_each_tracepoint_in_module(struct module * mod,void (* fct)(struct tracepoint *,struct module *,void *),void * priv)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
tracepoint_synchronize_unregister(void)115 static inline void tracepoint_synchronize_unregister(void)
116 {
117 synchronize_rcu_tasks_trace();
118 synchronize_rcu();
119 }
tracepoint_is_faultable(struct tracepoint * tp)120 static inline bool tracepoint_is_faultable(struct tracepoint *tp)
121 {
122 return tp->ext && tp->ext->faultable;
123 }
124 #else
tracepoint_synchronize_unregister(void)125 static inline void tracepoint_synchronize_unregister(void)
126 { }
tracepoint_is_faultable(struct tracepoint * tp)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
tracepoint_ptr_deref(tracepoint_ptr_t * p)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
tracepoint_ptr_deref(tracepoint_ptr_t * p)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 __rust_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 __rust_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 if (cond) { \
282 guard(preempt_notrace)(); \
283 __DO_TRACE_CALL(name, TP_ARGS(args)); \
284 } \
285 } \
286 if (IS_ENABLED(CONFIG_LOCKDEP) && (cond)) { \
287 WARN_ONCE(!rcu_is_watching(), \
288 "RCU not watching for tracepoint"); \
289 } \
290 }
291
292 #define __DECLARE_TRACE_SYSCALL(name, proto, args, data_proto) \
293 __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto)) \
294 static inline void __rust_do_trace_##name(proto) \
295 { \
296 guard(rcu_tasks_trace)(); \
297 __DO_TRACE_CALL(name, TP_ARGS(args)); \
298 } \
299 static inline void trace_##name(proto) \
300 { \
301 might_fault(); \
302 if (static_branch_unlikely(&__tracepoint_##name.key)) { \
303 guard(rcu_tasks_trace)(); \
304 __DO_TRACE_CALL(name, TP_ARGS(args)); \
305 } \
306 if (IS_ENABLED(CONFIG_LOCKDEP)) { \
307 WARN_ONCE(!rcu_is_watching(), \
308 "RCU not watching for tracepoint"); \
309 } \
310 }
311
312 /*
313 * We have no guarantee that gcc and the linker won't up-align the tracepoint
314 * structures, so we create an array of pointers that will be used for iteration
315 * on the tracepoints.
316 *
317 * it_func[0] is never NULL because there is at least one element in the array
318 * when the array itself is non NULL.
319 */
320 #define __DEFINE_TRACE_EXT(_name, _ext, proto, args) \
321 static const char __tpstrtab_##_name[] \
322 __section("__tracepoints_strings") = #_name; \
323 extern struct static_call_key STATIC_CALL_KEY(tp_func_##_name); \
324 int __traceiter_##_name(void *__data, proto); \
325 void __probestub_##_name(void *__data, proto); \
326 struct tracepoint __tracepoint_##_name __used \
327 __section("__tracepoints") = { \
328 .name = __tpstrtab_##_name, \
329 .key = STATIC_KEY_FALSE_INIT, \
330 .static_call_key = &STATIC_CALL_KEY(tp_func_##_name), \
331 .static_call_tramp = STATIC_CALL_TRAMP_ADDR(tp_func_##_name), \
332 .iterator = &__traceiter_##_name, \
333 .probestub = &__probestub_##_name, \
334 .funcs = NULL, \
335 .ext = _ext, \
336 }; \
337 __TRACEPOINT_ENTRY(_name); \
338 int __traceiter_##_name(void *__data, proto) \
339 { \
340 struct tracepoint_func *it_func_ptr; \
341 void *it_func; \
342 \
343 it_func_ptr = \
344 rcu_dereference_raw((&__tracepoint_##_name)->funcs); \
345 if (it_func_ptr) { \
346 do { \
347 it_func = READ_ONCE((it_func_ptr)->func); \
348 __data = (it_func_ptr)->data; \
349 ((void(*)(void *, proto))(it_func))(__data, args); \
350 } while ((++it_func_ptr)->func); \
351 } \
352 return 0; \
353 } \
354 void __probestub_##_name(void *__data, proto) \
355 { \
356 } \
357 DEFINE_STATIC_CALL(tp_func_##_name, __traceiter_##_name); \
358 DEFINE_RUST_DO_TRACE(_name, TP_PROTO(proto), TP_ARGS(args))
359
360 #define DEFINE_TRACE_FN(_name, _reg, _unreg, _proto, _args) \
361 static struct tracepoint_ext __tracepoint_ext_##_name = { \
362 .regfunc = _reg, \
363 .unregfunc = _unreg, \
364 .faultable = false, \
365 }; \
366 __DEFINE_TRACE_EXT(_name, &__tracepoint_ext_##_name, PARAMS(_proto), PARAMS(_args));
367
368 #define DEFINE_TRACE_SYSCALL(_name, _reg, _unreg, _proto, _args) \
369 static struct tracepoint_ext __tracepoint_ext_##_name = { \
370 .regfunc = _reg, \
371 .unregfunc = _unreg, \
372 .faultable = true, \
373 }; \
374 __DEFINE_TRACE_EXT(_name, &__tracepoint_ext_##_name, PARAMS(_proto), PARAMS(_args));
375
376 #define DEFINE_TRACE(_name, _proto, _args) \
377 __DEFINE_TRACE_EXT(_name, NULL, PARAMS(_proto), PARAMS(_args));
378
379 #define EXPORT_TRACEPOINT_SYMBOL_GPL(name) \
380 EXPORT_SYMBOL_GPL(__tracepoint_##name); \
381 EXPORT_SYMBOL_GPL(__traceiter_##name); \
382 EXPORT_STATIC_CALL_GPL(tp_func_##name)
383 #define EXPORT_TRACEPOINT_SYMBOL(name) \
384 EXPORT_SYMBOL(__tracepoint_##name); \
385 EXPORT_SYMBOL(__traceiter_##name); \
386 EXPORT_STATIC_CALL(tp_func_##name)
387
388
389 #else /* !TRACEPOINTS_ENABLED */
390 #define __DECLARE_TRACE_COMMON(name, proto, args, data_proto) \
391 static inline void trace_##name(proto) \
392 { } \
393 static inline int \
394 register_trace_##name(void (*probe)(data_proto), \
395 void *data) \
396 { \
397 return -ENOSYS; \
398 } \
399 static inline int \
400 unregister_trace_##name(void (*probe)(data_proto), \
401 void *data) \
402 { \
403 return -ENOSYS; \
404 } \
405 static inline void check_trace_callback_type_##name(void (*cb)(data_proto)) \
406 { \
407 } \
408 static inline bool \
409 trace_##name##_enabled(void) \
410 { \
411 return false; \
412 }
413
414 #define __DECLARE_TRACE(name, proto, args, cond, data_proto) \
415 __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto))
416
417 #define __DECLARE_TRACE_SYSCALL(name, proto, args, data_proto) \
418 __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto))
419
420 #define DEFINE_TRACE_FN(name, reg, unreg, proto, args)
421 #define DEFINE_TRACE_SYSCALL(name, reg, unreg, proto, args)
422 #define DEFINE_TRACE(name, proto, args)
423 #define EXPORT_TRACEPOINT_SYMBOL_GPL(name)
424 #define EXPORT_TRACEPOINT_SYMBOL(name)
425
426 #endif /* TRACEPOINTS_ENABLED */
427
428 #ifdef CONFIG_TRACING
429 /**
430 * tracepoint_string - register constant persistent string to trace system
431 * @str - a constant persistent string that will be referenced in tracepoints
432 *
433 * If constant strings are being used in tracepoints, it is faster and
434 * more efficient to just save the pointer to the string and reference
435 * that with a printf "%s" instead of saving the string in the ring buffer
436 * and wasting space and time.
437 *
438 * The problem with the above approach is that userspace tools that read
439 * the binary output of the trace buffers do not have access to the string.
440 * Instead they just show the address of the string which is not very
441 * useful to users.
442 *
443 * With tracepoint_string(), the string will be registered to the tracing
444 * system and exported to userspace via the debugfs/tracing/printk_formats
445 * file that maps the string address to the string text. This way userspace
446 * tools that read the binary buffers have a way to map the pointers to
447 * the ASCII strings they represent.
448 *
449 * The @str used must be a constant string and persistent as it would not
450 * make sense to show a string that no longer exists. But it is still fine
451 * to be used with modules, because when modules are unloaded, if they
452 * had tracepoints, the ring buffers are cleared too. As long as the string
453 * does not change during the life of the module, it is fine to use
454 * tracepoint_string() within a module.
455 */
456 #define tracepoint_string(str) \
457 ({ \
458 static const char *___tp_str __tracepoint_string = str; \
459 ___tp_str; \
460 })
461 #define __tracepoint_string __used __section("__tracepoint_str")
462 #else
463 /*
464 * tracepoint_string() is used to save the string address for userspace
465 * tracing tools. When tracing isn't configured, there's no need to save
466 * anything.
467 */
468 # define tracepoint_string(str) str
469 # define __tracepoint_string
470 #endif
471
472 #define DECLARE_TRACE(name, proto, args) \
473 __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
474 cpu_online(raw_smp_processor_id()), \
475 PARAMS(void *__data, proto))
476
477 #define DECLARE_TRACE_CONDITION(name, proto, args, cond) \
478 __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
479 cpu_online(raw_smp_processor_id()) && (PARAMS(cond)), \
480 PARAMS(void *__data, proto))
481
482 #define DECLARE_TRACE_SYSCALL(name, proto, args) \
483 __DECLARE_TRACE_SYSCALL(name, PARAMS(proto), PARAMS(args), \
484 PARAMS(void *__data, proto))
485
486 #define TRACE_EVENT_FLAGS(event, flag)
487
488 #define TRACE_EVENT_PERF_PERM(event, expr...)
489
490 #endif /* DECLARE_TRACE */
491
492 #ifndef TRACE_EVENT
493 /*
494 * For use with the TRACE_EVENT macro:
495 *
496 * We define a tracepoint, its arguments, its printk format
497 * and its 'fast binary record' layout.
498 *
499 * Firstly, name your tracepoint via TRACE_EVENT(name : the
500 * 'subsystem_event' notation is fine.
501 *
502 * Think about this whole construct as the
503 * 'trace_sched_switch() function' from now on.
504 *
505 *
506 * TRACE_EVENT(sched_switch,
507 *
508 * *
509 * * A function has a regular function arguments
510 * * prototype, declare it via TP_PROTO():
511 * *
512 *
513 * TP_PROTO(struct rq *rq, struct task_struct *prev,
514 * struct task_struct *next),
515 *
516 * *
517 * * Define the call signature of the 'function'.
518 * * (Design sidenote: we use this instead of a
519 * * TP_PROTO1/TP_PROTO2/TP_PROTO3 ugliness.)
520 * *
521 *
522 * TP_ARGS(rq, prev, next),
523 *
524 * *
525 * * Fast binary tracing: define the trace record via
526 * * TP_STRUCT__entry(). You can think about it like a
527 * * regular C structure local variable definition.
528 * *
529 * * This is how the trace record is structured and will
530 * * be saved into the ring buffer. These are the fields
531 * * that will be exposed to user-space in
532 * * /sys/kernel/tracing/events/<*>/format.
533 * *
534 * * The declared 'local variable' is called '__entry'
535 * *
536 * * __field(pid_t, prev_pid) is equivalent to a standard declaration:
537 * *
538 * * pid_t prev_pid;
539 * *
540 * * __array(char, prev_comm, TASK_COMM_LEN) is equivalent to:
541 * *
542 * * char prev_comm[TASK_COMM_LEN];
543 * *
544 *
545 * TP_STRUCT__entry(
546 * __array( char, prev_comm, TASK_COMM_LEN )
547 * __field( pid_t, prev_pid )
548 * __field( int, prev_prio )
549 * __array( char, next_comm, TASK_COMM_LEN )
550 * __field( pid_t, next_pid )
551 * __field( int, next_prio )
552 * ),
553 *
554 * *
555 * * Assign the entry into the trace record, by embedding
556 * * a full C statement block into TP_fast_assign(). You
557 * * can refer to the trace record as '__entry' -
558 * * otherwise you can put arbitrary C code in here.
559 * *
560 * * Note: this C code will execute every time a trace event
561 * * happens, on an active tracepoint.
562 * *
563 *
564 * TP_fast_assign(
565 * memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
566 * __entry->prev_pid = prev->pid;
567 * __entry->prev_prio = prev->prio;
568 * memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
569 * __entry->next_pid = next->pid;
570 * __entry->next_prio = next->prio;
571 * ),
572 *
573 * *
574 * * Formatted output of a trace record via TP_printk().
575 * * This is how the tracepoint will appear under ftrace
576 * * plugins that make use of this tracepoint.
577 * *
578 * * (raw-binary tracing wont actually perform this step.)
579 * *
580 *
581 * TP_printk("task %s:%d [%d] ==> %s:%d [%d]",
582 * __entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
583 * __entry->next_comm, __entry->next_pid, __entry->next_prio),
584 *
585 * );
586 *
587 * This macro construct is thus used for the regular printk format
588 * tracing setup, it is used to construct a function pointer based
589 * tracepoint callback (this is used by programmatic plugins and
590 * can also by used by generic instrumentation like SystemTap), and
591 * it is also used to expose a structured trace record in
592 * /sys/kernel/tracing/events/.
593 *
594 * A set of (un)registration functions can be passed to the variant
595 * TRACE_EVENT_FN to perform any (un)registration work.
596 */
597
598 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)
599 #define DEFINE_EVENT(template, name, proto, args) \
600 DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
601 #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)\
602 DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
603 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
604 DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
605 #define DEFINE_EVENT_CONDITION(template, name, proto, \
606 args, cond) \
607 DECLARE_TRACE_CONDITION(name, PARAMS(proto), \
608 PARAMS(args), PARAMS(cond))
609
610 #define TRACE_EVENT(name, proto, args, struct, assign, print) \
611 DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
612 #define TRACE_EVENT_FN(name, proto, args, struct, \
613 assign, print, reg, unreg) \
614 DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
615 #define TRACE_EVENT_FN_COND(name, proto, args, cond, struct, \
616 assign, print, reg, unreg) \
617 DECLARE_TRACE_CONDITION(name, PARAMS(proto), \
618 PARAMS(args), PARAMS(cond))
619 #define TRACE_EVENT_CONDITION(name, proto, args, cond, \
620 struct, assign, print) \
621 DECLARE_TRACE_CONDITION(name, PARAMS(proto), \
622 PARAMS(args), PARAMS(cond))
623 #define TRACE_EVENT_SYSCALL(name, proto, args, struct, assign, \
624 print, reg, unreg) \
625 DECLARE_TRACE_SYSCALL(name, PARAMS(proto), PARAMS(args))
626
627 #define TRACE_EVENT_FLAGS(event, flag)
628
629 #define TRACE_EVENT_PERF_PERM(event, expr...)
630
631 #define DECLARE_EVENT_NOP(name, proto, args) \
632 static inline void trace_##name(proto) \
633 { } \
634 static inline bool trace_##name##_enabled(void) \
635 { \
636 return false; \
637 }
638
639 #define TRACE_EVENT_NOP(name, proto, args, struct, assign, print) \
640 DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
641
642 #define DECLARE_EVENT_CLASS_NOP(name, proto, args, tstruct, assign, print)
643 #define DEFINE_EVENT_NOP(template, name, proto, args) \
644 DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
645
646 #endif /* ifdef TRACE_EVENT (see note above) */
647