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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/cpumask.h>
20 : : #include <linux/rcupdate.h>
21 : : #include <linux/tracepoint-defs.h>
22 : :
23 : : struct module;
24 : : struct tracepoint;
25 : : struct notifier_block;
26 : :
27 : : struct trace_eval_map {
28 : : const char *system;
29 : : const char *eval_string;
30 : : unsigned long eval_value;
31 : : };
32 : :
33 : : #define TRACEPOINT_DEFAULT_PRIO 10
34 : :
35 : : extern struct srcu_struct tracepoint_srcu;
36 : :
37 : : extern int
38 : : tracepoint_probe_register(struct tracepoint *tp, void *probe, void *data);
39 : : extern int
40 : : tracepoint_probe_register_prio(struct tracepoint *tp, void *probe, void *data,
41 : : int prio);
42 : : extern int
43 : : tracepoint_probe_unregister(struct tracepoint *tp, void *probe, void *data);
44 : : extern void
45 : : for_each_kernel_tracepoint(void (*fct)(struct tracepoint *tp, void *priv),
46 : : void *priv);
47 : :
48 : : #ifdef CONFIG_MODULES
49 : : struct tp_module {
50 : : struct list_head list;
51 : : struct module *mod;
52 : : };
53 : :
54 : : bool trace_module_has_bad_taint(struct module *mod);
55 : : extern int register_tracepoint_module_notifier(struct notifier_block *nb);
56 : : extern int unregister_tracepoint_module_notifier(struct notifier_block *nb);
57 : : #else
58 : : static inline bool trace_module_has_bad_taint(struct module *mod)
59 : : {
60 : : return false;
61 : : }
62 : : static inline
63 : : int register_tracepoint_module_notifier(struct notifier_block *nb)
64 : : {
65 : : return 0;
66 : : }
67 : : static inline
68 : : int unregister_tracepoint_module_notifier(struct notifier_block *nb)
69 : : {
70 : : return 0;
71 : : }
72 : : #endif /* CONFIG_MODULES */
73 : :
74 : : /*
75 : : * tracepoint_synchronize_unregister must be called between the last tracepoint
76 : : * probe unregistration and the end of module exit to make sure there is no
77 : : * caller executing a probe when it is freed.
78 : : */
79 : : #ifdef CONFIG_TRACEPOINTS
80 : 0 : static inline void tracepoint_synchronize_unregister(void)
81 : : {
82 : 0 : synchronize_srcu(&tracepoint_srcu);
83 : 0 : synchronize_rcu();
84 : 0 : }
85 : : #else
86 : : static inline void tracepoint_synchronize_unregister(void)
87 : : { }
88 : : #endif
89 : :
90 : : #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
91 : : extern int syscall_regfunc(void);
92 : : extern void syscall_unregfunc(void);
93 : : #endif /* CONFIG_HAVE_SYSCALL_TRACEPOINTS */
94 : :
95 : : #define PARAMS(args...) args
96 : :
97 : : #define TRACE_DEFINE_ENUM(x)
98 : : #define TRACE_DEFINE_SIZEOF(x)
99 : :
100 : : #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
101 : 0 : static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
102 : : {
103 : 0 : return offset_to_ptr(p);
104 : : }
105 : :
106 : : #define __TRACEPOINT_ENTRY(name) \
107 : : asm(" .section \"__tracepoints_ptrs\", \"a\" \n" \
108 : : " .balign 4 \n" \
109 : : " .long __tracepoint_" #name " - . \n" \
110 : : " .previous \n")
111 : : #else
112 : : static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
113 : : {
114 : : return *p;
115 : : }
116 : :
117 : : #define __TRACEPOINT_ENTRY(name) \
118 : : static tracepoint_ptr_t __tracepoint_ptr_##name __used \
119 : : __attribute__((section("__tracepoints_ptrs"))) = \
120 : : &__tracepoint_##name
121 : : #endif
122 : :
123 : : #endif /* _LINUX_TRACEPOINT_H */
124 : :
125 : : /*
126 : : * Note: we keep the TRACE_EVENT and DECLARE_TRACE outside the include
127 : : * file ifdef protection.
128 : : * This is due to the way trace events work. If a file includes two
129 : : * trace event headers under one "CREATE_TRACE_POINTS" the first include
130 : : * will override the TRACE_EVENT and break the second include.
131 : : */
132 : :
133 : : #ifndef DECLARE_TRACE
134 : :
135 : : #define TP_PROTO(args...) args
136 : : #define TP_ARGS(args...) args
137 : : #define TP_CONDITION(args...) args
138 : :
139 : : /*
140 : : * Individual subsystem my have a separate configuration to
141 : : * enable their tracepoints. By default, this file will create
142 : : * the tracepoints if CONFIG_TRACEPOINT is defined. If a subsystem
143 : : * wants to be able to disable its tracepoints from being created
144 : : * it can define NOTRACE before including the tracepoint headers.
145 : : */
146 : : #if defined(CONFIG_TRACEPOINTS) && !defined(NOTRACE)
147 : : #define TRACEPOINTS_ENABLED
148 : : #endif
149 : :
150 : : #ifdef TRACEPOINTS_ENABLED
151 : :
152 : : /*
153 : : * it_func[0] is never NULL because there is at least one element in the array
154 : : * when the array itself is non NULL.
155 : : *
156 : : * Note, the proto and args passed in includes "__data" as the first parameter.
157 : : * The reason for this is to handle the "void" prototype. If a tracepoint
158 : : * has a "void" prototype, then it is invalid to declare a function
159 : : * as "(void *, void)". The DECLARE_TRACE_NOARGS() will pass in just
160 : : * "void *data", where as the DECLARE_TRACE() will pass in "void *data, proto".
161 : : */
162 : : #define __DO_TRACE(tp, proto, args, cond, rcuidle) \
163 : : do { \
164 : : struct tracepoint_func *it_func_ptr; \
165 : : void *it_func; \
166 : : void *__data; \
167 : : int __maybe_unused __idx = 0; \
168 : : \
169 : : if (!(cond)) \
170 : : return; \
171 : : \
172 : : /* srcu can't be used from NMI */ \
173 : : WARN_ON_ONCE(rcuidle && in_nmi()); \
174 : : \
175 : : /* keep srcu and sched-rcu usage consistent */ \
176 : : preempt_disable_notrace(); \
177 : : \
178 : : /* \
179 : : * For rcuidle callers, use srcu since sched-rcu \
180 : : * doesn't work from the idle path. \
181 : : */ \
182 : : if (rcuidle) { \
183 : : __idx = srcu_read_lock_notrace(&tracepoint_srcu);\
184 : : rcu_irq_enter_irqson(); \
185 : : } \
186 : : \
187 : : it_func_ptr = rcu_dereference_raw((tp)->funcs); \
188 : : \
189 : : if (it_func_ptr) { \
190 : : do { \
191 : : it_func = (it_func_ptr)->func; \
192 : : __data = (it_func_ptr)->data; \
193 : : ((void(*)(proto))(it_func))(args); \
194 : : } while ((++it_func_ptr)->func); \
195 : : } \
196 : : \
197 : : if (rcuidle) { \
198 : : rcu_irq_exit_irqson(); \
199 : : srcu_read_unlock_notrace(&tracepoint_srcu, __idx);\
200 : : } \
201 : : \
202 : : preempt_enable_notrace(); \
203 : : } while (0)
204 : :
205 : : #ifndef MODULE
206 : : #define __DECLARE_TRACE_RCU(name, proto, args, cond, data_proto, data_args) \
207 : : static inline void trace_##name##_rcuidle(proto) \
208 : : { \
209 : : if (static_key_false(&__tracepoint_##name.key)) \
210 : : __DO_TRACE(&__tracepoint_##name, \
211 : : TP_PROTO(data_proto), \
212 : : TP_ARGS(data_args), \
213 : : TP_CONDITION(cond), 1); \
214 : : }
215 : : #else
216 : : #define __DECLARE_TRACE_RCU(name, proto, args, cond, data_proto, data_args)
217 : : #endif
218 : :
219 : : /*
220 : : * Make sure the alignment of the structure in the __tracepoints section will
221 : : * not add unwanted padding between the beginning of the section and the
222 : : * structure. Force alignment to the same alignment as the section start.
223 : : *
224 : : * When lockdep is enabled, we make sure to always do the RCU portions of
225 : : * the tracepoint code, regardless of whether tracing is on. However,
226 : : * don't check if the condition is false, due to interaction with idle
227 : : * instrumentation. This lets us find RCU issues triggered with tracepoints
228 : : * even when this tracepoint is off. This code has no purpose other than
229 : : * poking RCU a bit.
230 : : */
231 : : #define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
232 : : extern struct tracepoint __tracepoint_##name; \
233 : : static inline void trace_##name(proto) \
234 : : { \
235 : : if (static_key_false(&__tracepoint_##name.key)) \
236 : : __DO_TRACE(&__tracepoint_##name, \
237 : : TP_PROTO(data_proto), \
238 : : TP_ARGS(data_args), \
239 : : TP_CONDITION(cond), 0); \
240 : : if (IS_ENABLED(CONFIG_LOCKDEP) && (cond)) { \
241 : : rcu_read_lock_sched_notrace(); \
242 : : rcu_dereference_sched(__tracepoint_##name.funcs);\
243 : : rcu_read_unlock_sched_notrace(); \
244 : : } \
245 : : } \
246 : : __DECLARE_TRACE_RCU(name, PARAMS(proto), PARAMS(args), \
247 : : PARAMS(cond), PARAMS(data_proto), PARAMS(data_args)) \
248 : : static inline int \
249 : : register_trace_##name(void (*probe)(data_proto), void *data) \
250 : : { \
251 : : return tracepoint_probe_register(&__tracepoint_##name, \
252 : : (void *)probe, data); \
253 : : } \
254 : : static inline int \
255 : : register_trace_prio_##name(void (*probe)(data_proto), void *data,\
256 : : int prio) \
257 : : { \
258 : : return tracepoint_probe_register_prio(&__tracepoint_##name, \
259 : : (void *)probe, data, prio); \
260 : : } \
261 : : static inline int \
262 : : unregister_trace_##name(void (*probe)(data_proto), void *data) \
263 : : { \
264 : : return tracepoint_probe_unregister(&__tracepoint_##name,\
265 : : (void *)probe, data); \
266 : : } \
267 : : static inline void \
268 : : check_trace_callback_type_##name(void (*cb)(data_proto)) \
269 : : { \
270 : : } \
271 : : static inline bool \
272 : : trace_##name##_enabled(void) \
273 : : { \
274 : : return static_key_false(&__tracepoint_##name.key); \
275 : : }
276 : :
277 : : /*
278 : : * We have no guarantee that gcc and the linker won't up-align the tracepoint
279 : : * structures, so we create an array of pointers that will be used for iteration
280 : : * on the tracepoints.
281 : : */
282 : : #define DEFINE_TRACE_FN(name, reg, unreg) \
283 : : static const char __tpstrtab_##name[] \
284 : : __attribute__((section("__tracepoints_strings"))) = #name; \
285 : : struct tracepoint __tracepoint_##name \
286 : : __attribute__((section("__tracepoints"), used)) = \
287 : : { __tpstrtab_##name, STATIC_KEY_INIT_FALSE, reg, unreg, NULL };\
288 : : __TRACEPOINT_ENTRY(name);
289 : :
290 : : #define DEFINE_TRACE(name) \
291 : : DEFINE_TRACE_FN(name, NULL, NULL);
292 : :
293 : : #define EXPORT_TRACEPOINT_SYMBOL_GPL(name) \
294 : : EXPORT_SYMBOL_GPL(__tracepoint_##name)
295 : : #define EXPORT_TRACEPOINT_SYMBOL(name) \
296 : : EXPORT_SYMBOL(__tracepoint_##name)
297 : :
298 : : #else /* !TRACEPOINTS_ENABLED */
299 : : #define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
300 : : static inline void trace_##name(proto) \
301 : : { } \
302 : : static inline void trace_##name##_rcuidle(proto) \
303 : : { } \
304 : : static inline int \
305 : : register_trace_##name(void (*probe)(data_proto), \
306 : : void *data) \
307 : : { \
308 : : return -ENOSYS; \
309 : : } \
310 : : static inline int \
311 : : unregister_trace_##name(void (*probe)(data_proto), \
312 : : void *data) \
313 : : { \
314 : : return -ENOSYS; \
315 : : } \
316 : : static inline void check_trace_callback_type_##name(void (*cb)(data_proto)) \
317 : : { \
318 : : } \
319 : : static inline bool \
320 : : trace_##name##_enabled(void) \
321 : : { \
322 : : return false; \
323 : : }
324 : :
325 : : #define DEFINE_TRACE_FN(name, reg, unreg)
326 : : #define DEFINE_TRACE(name)
327 : : #define EXPORT_TRACEPOINT_SYMBOL_GPL(name)
328 : : #define EXPORT_TRACEPOINT_SYMBOL(name)
329 : :
330 : : #endif /* TRACEPOINTS_ENABLED */
331 : :
332 : : #ifdef CONFIG_TRACING
333 : : /**
334 : : * tracepoint_string - register constant persistent string to trace system
335 : : * @str - a constant persistent string that will be referenced in tracepoints
336 : : *
337 : : * If constant strings are being used in tracepoints, it is faster and
338 : : * more efficient to just save the pointer to the string and reference
339 : : * that with a printf "%s" instead of saving the string in the ring buffer
340 : : * and wasting space and time.
341 : : *
342 : : * The problem with the above approach is that userspace tools that read
343 : : * the binary output of the trace buffers do not have access to the string.
344 : : * Instead they just show the address of the string which is not very
345 : : * useful to users.
346 : : *
347 : : * With tracepoint_string(), the string will be registered to the tracing
348 : : * system and exported to userspace via the debugfs/tracing/printk_formats
349 : : * file that maps the string address to the string text. This way userspace
350 : : * tools that read the binary buffers have a way to map the pointers to
351 : : * the ASCII strings they represent.
352 : : *
353 : : * The @str used must be a constant string and persistent as it would not
354 : : * make sense to show a string that no longer exists. But it is still fine
355 : : * to be used with modules, because when modules are unloaded, if they
356 : : * had tracepoints, the ring buffers are cleared too. As long as the string
357 : : * does not change during the life of the module, it is fine to use
358 : : * tracepoint_string() within a module.
359 : : */
360 : : #define tracepoint_string(str) \
361 : : ({ \
362 : : static const char *___tp_str __tracepoint_string = str; \
363 : : ___tp_str; \
364 : : })
365 : : #define __tracepoint_string __attribute__((section("__tracepoint_str")))
366 : : #else
367 : : /*
368 : : * tracepoint_string() is used to save the string address for userspace
369 : : * tracing tools. When tracing isn't configured, there's no need to save
370 : : * anything.
371 : : */
372 : : # define tracepoint_string(str) str
373 : : # define __tracepoint_string
374 : : #endif
375 : :
376 : : /*
377 : : * The need for the DECLARE_TRACE_NOARGS() is to handle the prototype
378 : : * (void). "void" is a special value in a function prototype and can
379 : : * not be combined with other arguments. Since the DECLARE_TRACE()
380 : : * macro adds a data element at the beginning of the prototype,
381 : : * we need a way to differentiate "(void *data, proto)" from
382 : : * "(void *data, void)". The second prototype is invalid.
383 : : *
384 : : * DECLARE_TRACE_NOARGS() passes "void" as the tracepoint prototype
385 : : * and "void *__data" as the callback prototype.
386 : : *
387 : : * DECLARE_TRACE() passes "proto" as the tracepoint protoype and
388 : : * "void *__data, proto" as the callback prototype.
389 : : */
390 : : #define DECLARE_TRACE_NOARGS(name) \
391 : : __DECLARE_TRACE(name, void, , \
392 : : cpu_online(raw_smp_processor_id()), \
393 : : void *__data, __data)
394 : :
395 : : #define DECLARE_TRACE(name, proto, args) \
396 : : __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
397 : : cpu_online(raw_smp_processor_id()), \
398 : : PARAMS(void *__data, proto), \
399 : : PARAMS(__data, args))
400 : :
401 : : #define DECLARE_TRACE_CONDITION(name, proto, args, cond) \
402 : : __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
403 : : cpu_online(raw_smp_processor_id()) && (PARAMS(cond)), \
404 : : PARAMS(void *__data, proto), \
405 : : PARAMS(__data, args))
406 : :
407 : : #define TRACE_EVENT_FLAGS(event, flag)
408 : :
409 : : #define TRACE_EVENT_PERF_PERM(event, expr...)
410 : :
411 : : #endif /* DECLARE_TRACE */
412 : :
413 : : #ifndef TRACE_EVENT
414 : : /*
415 : : * For use with the TRACE_EVENT macro:
416 : : *
417 : : * We define a tracepoint, its arguments, its printk format
418 : : * and its 'fast binary record' layout.
419 : : *
420 : : * Firstly, name your tracepoint via TRACE_EVENT(name : the
421 : : * 'subsystem_event' notation is fine.
422 : : *
423 : : * Think about this whole construct as the
424 : : * 'trace_sched_switch() function' from now on.
425 : : *
426 : : *
427 : : * TRACE_EVENT(sched_switch,
428 : : *
429 : : * *
430 : : * * A function has a regular function arguments
431 : : * * prototype, declare it via TP_PROTO():
432 : : * *
433 : : *
434 : : * TP_PROTO(struct rq *rq, struct task_struct *prev,
435 : : * struct task_struct *next),
436 : : *
437 : : * *
438 : : * * Define the call signature of the 'function'.
439 : : * * (Design sidenote: we use this instead of a
440 : : * * TP_PROTO1/TP_PROTO2/TP_PROTO3 ugliness.)
441 : : * *
442 : : *
443 : : * TP_ARGS(rq, prev, next),
444 : : *
445 : : * *
446 : : * * Fast binary tracing: define the trace record via
447 : : * * TP_STRUCT__entry(). You can think about it like a
448 : : * * regular C structure local variable definition.
449 : : * *
450 : : * * This is how the trace record is structured and will
451 : : * * be saved into the ring buffer. These are the fields
452 : : * * that will be exposed to user-space in
453 : : * * /sys/kernel/debug/tracing/events/<*>/format.
454 : : * *
455 : : * * The declared 'local variable' is called '__entry'
456 : : * *
457 : : * * __field(pid_t, prev_prid) is equivalent to a standard declariton:
458 : : * *
459 : : * * pid_t prev_pid;
460 : : * *
461 : : * * __array(char, prev_comm, TASK_COMM_LEN) is equivalent to:
462 : : * *
463 : : * * char prev_comm[TASK_COMM_LEN];
464 : : * *
465 : : *
466 : : * TP_STRUCT__entry(
467 : : * __array( char, prev_comm, TASK_COMM_LEN )
468 : : * __field( pid_t, prev_pid )
469 : : * __field( int, prev_prio )
470 : : * __array( char, next_comm, TASK_COMM_LEN )
471 : : * __field( pid_t, next_pid )
472 : : * __field( int, next_prio )
473 : : * ),
474 : : *
475 : : * *
476 : : * * Assign the entry into the trace record, by embedding
477 : : * * a full C statement block into TP_fast_assign(). You
478 : : * * can refer to the trace record as '__entry' -
479 : : * * otherwise you can put arbitrary C code in here.
480 : : * *
481 : : * * Note: this C code will execute every time a trace event
482 : : * * happens, on an active tracepoint.
483 : : * *
484 : : *
485 : : * TP_fast_assign(
486 : : * memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
487 : : * __entry->prev_pid = prev->pid;
488 : : * __entry->prev_prio = prev->prio;
489 : : * memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
490 : : * __entry->next_pid = next->pid;
491 : : * __entry->next_prio = next->prio;
492 : : * ),
493 : : *
494 : : * *
495 : : * * Formatted output of a trace record via TP_printk().
496 : : * * This is how the tracepoint will appear under ftrace
497 : : * * plugins that make use of this tracepoint.
498 : : * *
499 : : * * (raw-binary tracing wont actually perform this step.)
500 : : * *
501 : : *
502 : : * TP_printk("task %s:%d [%d] ==> %s:%d [%d]",
503 : : * __entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
504 : : * __entry->next_comm, __entry->next_pid, __entry->next_prio),
505 : : *
506 : : * );
507 : : *
508 : : * This macro construct is thus used for the regular printk format
509 : : * tracing setup, it is used to construct a function pointer based
510 : : * tracepoint callback (this is used by programmatic plugins and
511 : : * can also by used by generic instrumentation like SystemTap), and
512 : : * it is also used to expose a structured trace record in
513 : : * /sys/kernel/debug/tracing/events/.
514 : : *
515 : : * A set of (un)registration functions can be passed to the variant
516 : : * TRACE_EVENT_FN to perform any (un)registration work.
517 : : */
518 : :
519 : : #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)
520 : : #define DEFINE_EVENT(template, name, proto, args) \
521 : : DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
522 : : #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)\
523 : : DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
524 : : #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
525 : : DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
526 : : #define DEFINE_EVENT_CONDITION(template, name, proto, \
527 : : args, cond) \
528 : : DECLARE_TRACE_CONDITION(name, PARAMS(proto), \
529 : : PARAMS(args), PARAMS(cond))
530 : :
531 : : #define TRACE_EVENT(name, proto, args, struct, assign, print) \
532 : : DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
533 : : #define TRACE_EVENT_FN(name, proto, args, struct, \
534 : : assign, print, reg, unreg) \
535 : : DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
536 : : #define TRACE_EVENT_FN_COND(name, proto, args, cond, struct, \
537 : : assign, print, reg, unreg) \
538 : : DECLARE_TRACE_CONDITION(name, PARAMS(proto), \
539 : : PARAMS(args), PARAMS(cond))
540 : : #define TRACE_EVENT_CONDITION(name, proto, args, cond, \
541 : : struct, assign, print) \
542 : : DECLARE_TRACE_CONDITION(name, PARAMS(proto), \
543 : : PARAMS(args), PARAMS(cond))
544 : :
545 : : #define TRACE_EVENT_FLAGS(event, flag)
546 : :
547 : : #define TRACE_EVENT_PERF_PERM(event, expr...)
548 : :
549 : : #define DECLARE_EVENT_NOP(name, proto, args) \
550 : : static inline void trace_##name(proto) \
551 : : { } \
552 : : static inline bool trace_##name##_enabled(void) \
553 : : { \
554 : : return false; \
555 : : }
556 : :
557 : : #define TRACE_EVENT_NOP(name, proto, args, struct, assign, print) \
558 : : DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
559 : :
560 : : #define DECLARE_EVENT_CLASS_NOP(name, proto, args, tstruct, assign, print)
561 : : #define DEFINE_EVENT_NOP(template, name, proto, args) \
562 : : DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
563 : :
564 : : #endif /* ifdef TRACE_EVENT (see note above) */
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