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
24struct module;
25struct tracepoint;
26struct notifier_block;
27
28struct 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
36extern int
37tracepoint_probe_register(struct tracepoint *tp, void *probe, void *data);
38extern int
39tracepoint_probe_register_prio(struct tracepoint *tp, void *probe, void *data,
40 int prio);
41extern int
42tracepoint_probe_register_prio_may_exist(struct tracepoint *tp, void *probe, void *data,
43 int prio);
44extern int
45tracepoint_probe_unregister(struct tracepoint *tp, void *probe, void *data);
46static inline int
47tracepoint_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}
53extern void
54for_each_kernel_tracepoint(void (*fct)(struct tracepoint *tp, void *priv),
55 void *priv);
56
57#ifdef CONFIG_MODULES
58struct tp_module {
59 struct list_head list;
60 struct module *mod;
61};
62
63bool trace_module_has_bad_taint(struct module *mod);
64extern int register_tracepoint_module_notifier(struct notifier_block *nb);
65extern int unregister_tracepoint_module_notifier(struct notifier_block *nb);
66void for_each_module_tracepoint(void (*fct)(struct tracepoint *,
67 struct module *, void *),
68 void *priv);
69void for_each_tracepoint_in_module(struct module *,
70 void (*fct)(struct tracepoint *,
71 struct module *, void *),
72 void *priv);
73#else
74static inline bool trace_module_has_bad_taint(struct module *mod)
75{
76 return false;
77}
78static inline
79int register_tracepoint_module_notifier(struct notifier_block *nb)
80{
81 return 0;
82}
83static inline
84int unregister_tracepoint_module_notifier(struct notifier_block *nb)
85{
86 return 0;
87}
88static inline
89void for_each_module_tracepoint(void (*fct)(struct tracepoint *,
90 struct module *, void *),
91 void *priv)
92{
93}
94static inline
95void 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
115static inline void tracepoint_synchronize_unregister(void)
116{
117 synchronize_rcu_tasks_trace();
118 synchronize_rcu();
119}
120static inline bool tracepoint_is_faultable(struct tracepoint *tp)
121{
122 return tp->ext && tp->ext->faultable;
123}
124#else
125static inline void tracepoint_synchronize_unregister(void)
126{ }
127static inline bool tracepoint_is_faultable(struct tracepoint *tp)
128{
129 return false;
130}
131#endif
132
133#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
134extern int syscall_regfunc(void);
135extern 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
146static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
147{
148 return offset_to_ptr(off: 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
157static 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##_tp, 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##_tp, 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##_tp, PARAMS(proto), PARAMS(args), \
478 PARAMS(void *__data, proto))
479
480#define DECLARE_TRACE_EVENT(name, proto, args) \
481 __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
482 cpu_online(raw_smp_processor_id()), \
483 PARAMS(void *__data, proto))
484
485#define DECLARE_TRACE_EVENT_CONDITION(name, proto, args, cond) \
486 __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
487 cpu_online(raw_smp_processor_id()) && (PARAMS(cond)), \
488 PARAMS(void *__data, proto))
489
490#define DECLARE_TRACE_EVENT_SYSCALL(name, proto, args) \
491 __DECLARE_TRACE_SYSCALL(name, PARAMS(proto), PARAMS(args), \
492 PARAMS(void *__data, proto))
493
494#define TRACE_EVENT_FLAGS(event, flag)
495
496#define TRACE_EVENT_PERF_PERM(event, expr...)
497
498#endif /* DECLARE_TRACE */
499
500#ifndef TRACE_EVENT
501/*
502 * For use with the TRACE_EVENT macro:
503 *
504 * We define a tracepoint, its arguments, its printk format
505 * and its 'fast binary record' layout.
506 *
507 * Firstly, name your tracepoint via TRACE_EVENT(name : the
508 * 'subsystem_event' notation is fine.
509 *
510 * Think about this whole construct as the
511 * 'trace_sched_switch() function' from now on.
512 *
513 *
514 * TRACE_EVENT(sched_switch,
515 *
516 * *
517 * * A function has a regular function arguments
518 * * prototype, declare it via TP_PROTO():
519 * *
520 *
521 * TP_PROTO(struct rq *rq, struct task_struct *prev,
522 * struct task_struct *next),
523 *
524 * *
525 * * Define the call signature of the 'function'.
526 * * (Design sidenote: we use this instead of a
527 * * TP_PROTO1/TP_PROTO2/TP_PROTO3 ugliness.)
528 * *
529 *
530 * TP_ARGS(rq, prev, next),
531 *
532 * *
533 * * Fast binary tracing: define the trace record via
534 * * TP_STRUCT__entry(). You can think about it like a
535 * * regular C structure local variable definition.
536 * *
537 * * This is how the trace record is structured and will
538 * * be saved into the ring buffer. These are the fields
539 * * that will be exposed to user-space in
540 * * /sys/kernel/tracing/events/<*>/format.
541 * *
542 * * The declared 'local variable' is called '__entry'
543 * *
544 * * __field(pid_t, prev_pid) is equivalent to a standard declaration:
545 * *
546 * * pid_t prev_pid;
547 * *
548 * * __array(char, prev_comm, TASK_COMM_LEN) is equivalent to:
549 * *
550 * * char prev_comm[TASK_COMM_LEN];
551 * *
552 *
553 * TP_STRUCT__entry(
554 * __array( char, prev_comm, TASK_COMM_LEN )
555 * __field( pid_t, prev_pid )
556 * __field( int, prev_prio )
557 * __array( char, next_comm, TASK_COMM_LEN )
558 * __field( pid_t, next_pid )
559 * __field( int, next_prio )
560 * ),
561 *
562 * *
563 * * Assign the entry into the trace record, by embedding
564 * * a full C statement block into TP_fast_assign(). You
565 * * can refer to the trace record as '__entry' -
566 * * otherwise you can put arbitrary C code in here.
567 * *
568 * * Note: this C code will execute every time a trace event
569 * * happens, on an active tracepoint.
570 * *
571 *
572 * TP_fast_assign(
573 * memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
574 * __entry->prev_pid = prev->pid;
575 * __entry->prev_prio = prev->prio;
576 * memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
577 * __entry->next_pid = next->pid;
578 * __entry->next_prio = next->prio;
579 * ),
580 *
581 * *
582 * * Formatted output of a trace record via TP_printk().
583 * * This is how the tracepoint will appear under ftrace
584 * * plugins that make use of this tracepoint.
585 * *
586 * * (raw-binary tracing wont actually perform this step.)
587 * *
588 *
589 * TP_printk("task %s:%d [%d] ==> %s:%d [%d]",
590 * __entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
591 * __entry->next_comm, __entry->next_pid, __entry->next_prio),
592 *
593 * );
594 *
595 * This macro construct is thus used for the regular printk format
596 * tracing setup, it is used to construct a function pointer based
597 * tracepoint callback (this is used by programmatic plugins and
598 * can also by used by generic instrumentation like SystemTap), and
599 * it is also used to expose a structured trace record in
600 * /sys/kernel/tracing/events/.
601 *
602 * A set of (un)registration functions can be passed to the variant
603 * TRACE_EVENT_FN to perform any (un)registration work.
604 */
605
606#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)
607#define DEFINE_EVENT(template, name, proto, args) \
608 DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args))
609#define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)\
610 DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args))
611#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
612 DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args))
613#define DEFINE_EVENT_CONDITION(template, name, proto, \
614 args, cond) \
615 DECLARE_TRACE_EVENT_CONDITION(name, PARAMS(proto), \
616 PARAMS(args), PARAMS(cond))
617
618#define TRACE_EVENT(name, proto, args, struct, assign, print) \
619 DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args))
620#define TRACE_EVENT_FN(name, proto, args, struct, \
621 assign, print, reg, unreg) \
622 DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args))
623#define TRACE_EVENT_FN_COND(name, proto, args, cond, struct, \
624 assign, print, reg, unreg) \
625 DECLARE_TRACE_EVENT_CONDITION(name, PARAMS(proto), \
626 PARAMS(args), PARAMS(cond))
627#define TRACE_EVENT_CONDITION(name, proto, args, cond, \
628 struct, assign, print) \
629 DECLARE_TRACE_EVENT_CONDITION(name, PARAMS(proto), \
630 PARAMS(args), PARAMS(cond))
631#define TRACE_EVENT_SYSCALL(name, proto, args, struct, assign, \
632 print, reg, unreg) \
633 DECLARE_TRACE_EVENT_SYSCALL(name, PARAMS(proto), PARAMS(args))
634
635#define TRACE_EVENT_FLAGS(event, flag)
636
637#define TRACE_EVENT_PERF_PERM(event, expr...)
638
639#define DECLARE_EVENT_NOP(name, proto, args) \
640 static inline void trace_##name(proto) \
641 { } \
642 static inline bool trace_##name##_enabled(void) \
643 { \
644 return false; \
645 }
646
647#define TRACE_EVENT_NOP(name, proto, args, struct, assign, print) \
648 DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
649
650#define DECLARE_EVENT_CLASS_NOP(name, proto, args, tstruct, assign, print)
651#define DEFINE_EVENT_NOP(template, name, proto, args) \
652 DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
653
654#endif /* ifdef TRACE_EVENT (see note above) */
655