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Linux/include/linux/tracepoint.h

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

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