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tracing: Remove conditional locking from __DO_TRACE()
[drm/drm-misc.git] / include / linux / tracepoint.h
blob832f49b56b1f9a5027d3d9a57e4a977135218a3c
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
47 tracepoint_probe_register_may_exist(struct tracepoint *tp, void *probe,
48 void *data)
49 {
50 return tracepoint_probe_register_prio_may_exist(tp, probe, data,
51 TRACEPOINT_DEFAULT_PRIO);
52 }
53 extern void
54 for_each_kernel_tracepoint(void (*fct)(struct tracepoint *tp, void *priv),
55 void *priv);
56
57 #ifdef CONFIG_MODULES
58 struct tp_module {
59 struct list_head list;
60 struct module *mod;
61 };
62
63 bool trace_module_has_bad_taint(struct module *mod);
64 extern int register_tracepoint_module_notifier(struct notifier_block *nb);
65 extern int unregister_tracepoint_module_notifier(struct notifier_block *nb);
66 void for_each_module_tracepoint(void (*fct)(struct tracepoint *,
67 struct module *, void *),
68 void *priv);
69 void for_each_tracepoint_in_module(struct module *,
70 void (*fct)(struct tracepoint *,
71 struct module *, void *),
72 void *priv);
73 #else
74 static inline bool trace_module_has_bad_taint(struct module *mod)
75 {
76 return false;
77 }
78 static inline
79 int register_tracepoint_module_notifier(struct notifier_block *nb)
80 {
81 return 0;
82 }
83 static inline
84 int unregister_tracepoint_module_notifier(struct notifier_block *nb)
85 {
86 return 0;
87 }
88 static inline
89 void for_each_module_tracepoint(void (*fct)(struct tracepoint *,
90 struct module *, void *),
91 void *priv)
92 {
93 }
94 static inline
95 void for_each_tracepoint_in_module(struct module *mod,
96 void (*fct)(struct tracepoint *,
97 struct module *, void *),
98 void *priv)
99 {
100 }
101 #endif /* CONFIG_MODULES */
102
103 /*
104 * tracepoint_synchronize_unregister must be called between the last tracepoint
105 * probe unregistration and the end of module exit to make sure there is no
106 * caller executing a probe when it is freed.
107 *
108 * An alternative is to use the following for batch reclaim associated
109 * with a given tracepoint:
110 *
111 * - tracepoint_is_faultable() == false: call_rcu()
112 * - tracepoint_is_faultable() == true: call_rcu_tasks_trace()
113 */
114 #ifdef CONFIG_TRACEPOINTS
115 static inline void tracepoint_synchronize_unregister(void)
116 {
117 synchronize_rcu_tasks_trace();
118 synchronize_rcu();
119 }
120 static inline bool tracepoint_is_faultable(struct tracepoint *tp)
121 {
122 return tp->ext && tp->ext->faultable;
123 }
124 #else
125 static inline void tracepoint_synchronize_unregister(void)
126 { }
127 static inline bool tracepoint_is_faultable(struct tracepoint *tp)
128 {
129 return false;
130 }
131 #endif
132
133 #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
134 extern int syscall_regfunc(void);
135 extern void syscall_unregfunc(void);
136 #endif /* CONFIG_HAVE_SYSCALL_TRACEPOINTS */
137
138 #ifndef PARAMS
139 #define PARAMS(args...) args
140 #endif
141
142 #define TRACE_DEFINE_ENUM(x)
143 #define TRACE_DEFINE_SIZEOF(x)
144
145 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
146 static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
147 {
148 return offset_to_ptr(p);
149 }
150
151 #define __TRACEPOINT_ENTRY(name) \
152 asm(" .section \"__tracepoints_ptrs\", \"a\" \n" \
153 " .balign 4 \n" \
154 " .long __tracepoint_" #name " - . \n" \
155 " .previous \n")
156 #else
157 static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
158 {
159 return *p;
160 }
161
162 #define __TRACEPOINT_ENTRY(name) \
163 static tracepoint_ptr_t __tracepoint_ptr_##name __used \
164 __section("__tracepoints_ptrs") = &__tracepoint_##name
165 #endif
166
167 #endif /* _LINUX_TRACEPOINT_H */
168
169 /*
170 * Note: we keep the TRACE_EVENT and DECLARE_TRACE outside the include
171 * file ifdef protection.
172 * This is due to the way trace events work. If a file includes two
173 * trace event headers under one "CREATE_TRACE_POINTS" the first include
174 * will override the TRACE_EVENT and break the second include.
175 */
176
177 #ifndef DECLARE_TRACE
178
179 #define TP_PROTO(args...) args
180 #define TP_ARGS(args...) args
181 #define TP_CONDITION(args...) args
182
183 /*
184 * Individual subsystem my have a separate configuration to
185 * enable their tracepoints. By default, this file will create
186 * the tracepoints if CONFIG_TRACEPOINTS is defined. If a subsystem
187 * wants to be able to disable its tracepoints from being created
188 * it can define NOTRACE before including the tracepoint headers.
189 */
190 #if defined(CONFIG_TRACEPOINTS) && !defined(NOTRACE)
191 #define TRACEPOINTS_ENABLED
192 #endif
193
194 #ifdef TRACEPOINTS_ENABLED
195
196 #ifdef CONFIG_HAVE_STATIC_CALL
197 #define __DO_TRACE_CALL(name, args) \
198 do { \
199 struct tracepoint_func *it_func_ptr; \
200 void *__data; \
201 it_func_ptr = \
202 rcu_dereference_raw((&__tracepoint_##name)->funcs); \
203 if (it_func_ptr) { \
204 __data = (it_func_ptr)->data; \
205 static_call(tp_func_##name)(__data, args); \
206 } \
207 } while (0)
208 #else
209 #define __DO_TRACE_CALL(name, args) __traceiter_##name(NULL, args)
210 #endif /* CONFIG_HAVE_STATIC_CALL */
211
212 /*
213 * Make sure the alignment of the structure in the __tracepoints section will
214 * not add unwanted padding between the beginning of the section and the
215 * structure. Force alignment to the same alignment as the section start.
216 *
217 * When lockdep is enabled, we make sure to always test if RCU is
218 * "watching" regardless if the tracepoint is enabled or not. Tracepoints
219 * require RCU to be active, and it should always warn at the tracepoint
220 * site if it is not watching, as it will need to be active when the
221 * tracepoint is enabled.
222 */
223 #define __DECLARE_TRACE_COMMON(name, proto, args, cond, data_proto) \
224 extern int __traceiter_##name(data_proto); \
225 DECLARE_STATIC_CALL(tp_func_##name, __traceiter_##name); \
226 extern struct tracepoint __tracepoint_##name; \
227 static inline int \
228 register_trace_##name(void (*probe)(data_proto), void *data) \
229 { \
230 return tracepoint_probe_register(&__tracepoint_##name, \
231 (void *)probe, data); \
232 } \
233 static inline int \
234 register_trace_prio_##name(void (*probe)(data_proto), void *data,\
235 int prio) \
236 { \
237 return tracepoint_probe_register_prio(&__tracepoint_##name, \
238 (void *)probe, data, prio); \
239 } \
240 static inline int \
241 unregister_trace_##name(void (*probe)(data_proto), void *data) \
242 { \
243 return tracepoint_probe_unregister(&__tracepoint_##name,\
244 (void *)probe, data); \
245 } \
246 static inline void \
247 check_trace_callback_type_##name(void (*cb)(data_proto)) \
248 { \
249 } \
250 static inline bool \
251 trace_##name##_enabled(void) \
252 { \
253 return static_branch_unlikely(&__tracepoint_##name.key);\
254 }
255
256 #define __DECLARE_TRACE(name, proto, args, cond, data_proto) \
257 __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), cond, PARAMS(data_proto)) \
258 static inline void trace_##name(proto) \
259 { \
260 if (static_branch_unlikely(&__tracepoint_##name.key)) { \
261 if (cond) { \
262 scoped_guard(preempt_notrace) \
263 __DO_TRACE_CALL(name, TP_ARGS(args)); \
264 } \
265 } \
266 if (IS_ENABLED(CONFIG_LOCKDEP) && (cond)) { \
267 WARN_ONCE(!rcu_is_watching(), \
268 "RCU not watching for tracepoint"); \
269 } \
270 }
271
272 #define __DECLARE_TRACE_SYSCALL(name, proto, args, cond, data_proto) \
273 __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), cond, PARAMS(data_proto)) \
274 static inline void trace_##name(proto) \
275 { \
276 might_fault(); \
277 if (static_branch_unlikely(&__tracepoint_##name.key)) { \
278 if (cond) { \
279 scoped_guard(rcu_tasks_trace) \
280 __DO_TRACE_CALL(name, TP_ARGS(args)); \
281 } \
282 } \
283 if (IS_ENABLED(CONFIG_LOCKDEP) && (cond)) { \
284 WARN_ONCE(!rcu_is_watching(), \
285 "RCU not watching for tracepoint"); \
286 } \
287 }
288
289 /*
290 * We have no guarantee that gcc and the linker won't up-align the tracepoint
291 * structures, so we create an array of pointers that will be used for iteration
292 * on the tracepoints.
293 *
294 * it_func[0] is never NULL because there is at least one element in the array
295 * when the array itself is non NULL.
296 */
297 #define __DEFINE_TRACE_EXT(_name, _ext, proto, args) \
298 static const char __tpstrtab_##_name[] \
299 __section("__tracepoints_strings") = #_name; \
300 extern struct static_call_key STATIC_CALL_KEY(tp_func_##_name); \
301 int __traceiter_##_name(void *__data, proto); \
302 void __probestub_##_name(void *__data, proto); \
303 struct tracepoint __tracepoint_##_name __used \
304 __section("__tracepoints") = { \
305 .name = __tpstrtab_##_name, \
306 .key = STATIC_KEY_FALSE_INIT, \
307 .static_call_key = &STATIC_CALL_KEY(tp_func_##_name), \
308 .static_call_tramp = STATIC_CALL_TRAMP_ADDR(tp_func_##_name), \
309 .iterator = &__traceiter_##_name, \
310 .probestub = &__probestub_##_name, \
311 .funcs = NULL, \
312 .ext = _ext, \
313 }; \
314 __TRACEPOINT_ENTRY(_name); \
315 int __traceiter_##_name(void *__data, proto) \
316 { \
317 struct tracepoint_func *it_func_ptr; \
318 void *it_func; \
319 \
320 it_func_ptr = \
321 rcu_dereference_raw((&__tracepoint_##_name)->funcs); \
322 if (it_func_ptr) { \
323 do { \
324 it_func = READ_ONCE((it_func_ptr)->func); \
325 __data = (it_func_ptr)->data; \
326 ((void(*)(void *, proto))(it_func))(__data, args); \
327 } while ((++it_func_ptr)->func); \
328 } \
329 return 0; \
330 } \
331 void __probestub_##_name(void *__data, proto) \
332 { \
333 } \
334 DEFINE_STATIC_CALL(tp_func_##_name, __traceiter_##_name);
335
336 #define DEFINE_TRACE_FN(_name, _reg, _unreg, _proto, _args) \
337 static struct tracepoint_ext __tracepoint_ext_##_name = { \
338 .regfunc = _reg, \
339 .unregfunc = _unreg, \
340 .faultable = false, \
341 }; \
342 __DEFINE_TRACE_EXT(_name, &__tracepoint_ext_##_name, PARAMS(_proto), PARAMS(_args));
343
344 #define DEFINE_TRACE_SYSCALL(_name, _reg, _unreg, _proto, _args) \
345 static struct tracepoint_ext __tracepoint_ext_##_name = { \
346 .regfunc = _reg, \
347 .unregfunc = _unreg, \
348 .faultable = true, \
349 }; \
350 __DEFINE_TRACE_EXT(_name, &__tracepoint_ext_##_name, PARAMS(_proto), PARAMS(_args));
351
352 #define DEFINE_TRACE(_name, _proto, _args) \
353 __DEFINE_TRACE_EXT(_name, NULL, PARAMS(_proto), PARAMS(_args));
354
355 #define EXPORT_TRACEPOINT_SYMBOL_GPL(name) \
356 EXPORT_SYMBOL_GPL(__tracepoint_##name); \
357 EXPORT_SYMBOL_GPL(__traceiter_##name); \
358 EXPORT_STATIC_CALL_GPL(tp_func_##name)
359 #define EXPORT_TRACEPOINT_SYMBOL(name) \
360 EXPORT_SYMBOL(__tracepoint_##name); \
361 EXPORT_SYMBOL(__traceiter_##name); \
362 EXPORT_STATIC_CALL(tp_func_##name)
363
364
365 #else /* !TRACEPOINTS_ENABLED */
366 #define __DECLARE_TRACE(name, proto, args, cond, data_proto) \
367 static inline void trace_##name(proto) \
368 { } \
369 static inline int \
370 register_trace_##name(void (*probe)(data_proto), \
371 void *data) \
372 { \
373 return -ENOSYS; \
374 } \
375 static inline int \
376 unregister_trace_##name(void (*probe)(data_proto), \
377 void *data) \
378 { \
379 return -ENOSYS; \
380 } \
381 static inline void check_trace_callback_type_##name(void (*cb)(data_proto)) \
382 { \
383 } \
384 static inline bool \
385 trace_##name##_enabled(void) \
386 { \
387 return false; \
388 }
389
390 #define __DECLARE_TRACE_SYSCALL __DECLARE_TRACE
391
392 #define DEFINE_TRACE_FN(name, reg, unreg, proto, args)
393 #define DEFINE_TRACE_SYSCALL(name, reg, unreg, proto, args)
394 #define DEFINE_TRACE(name, proto, args)
395 #define EXPORT_TRACEPOINT_SYMBOL_GPL(name)
396 #define EXPORT_TRACEPOINT_SYMBOL(name)
397
398 #endif /* TRACEPOINTS_ENABLED */
399
400 #ifdef CONFIG_TRACING
401 /**
402 * tracepoint_string - register constant persistent string to trace system
403 * @str - a constant persistent string that will be referenced in tracepoints
404 *
405 * If constant strings are being used in tracepoints, it is faster and
406 * more efficient to just save the pointer to the string and reference
407 * that with a printf "%s" instead of saving the string in the ring buffer
408 * and wasting space and time.
409 *
410 * The problem with the above approach is that userspace tools that read
411 * the binary output of the trace buffers do not have access to the string.
412 * Instead they just show the address of the string which is not very
413 * useful to users.
414 *
415 * With tracepoint_string(), the string will be registered to the tracing
416 * system and exported to userspace via the debugfs/tracing/printk_formats
417 * file that maps the string address to the string text. This way userspace
418 * tools that read the binary buffers have a way to map the pointers to
419 * the ASCII strings they represent.
420 *
421 * The @str used must be a constant string and persistent as it would not
422 * make sense to show a string that no longer exists. But it is still fine
423 * to be used with modules, because when modules are unloaded, if they
424 * had tracepoints, the ring buffers are cleared too. As long as the string
425 * does not change during the life of the module, it is fine to use
426 * tracepoint_string() within a module.
427 */
428 #define tracepoint_string(str) \
429 ({ \
430 static const char *___tp_str __tracepoint_string = str; \
431 ___tp_str; \
432 })
433 #define __tracepoint_string __used __section("__tracepoint_str")
434 #else
435 /*
436 * tracepoint_string() is used to save the string address for userspace
437 * tracing tools. When tracing isn't configured, there's no need to save
438 * anything.
439 */
440 # define tracepoint_string(str) str
441 # define __tracepoint_string
442 #endif
443
444 #define DECLARE_TRACE(name, proto, args) \
445 __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
446 cpu_online(raw_smp_processor_id()), \
447 PARAMS(void *__data, proto))
448
449 #define DECLARE_TRACE_CONDITION(name, proto, args, cond) \
450 __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
451 cpu_online(raw_smp_processor_id()) && (PARAMS(cond)), \
452 PARAMS(void *__data, proto))
453
454 #define DECLARE_TRACE_SYSCALL(name, proto, args) \
455 __DECLARE_TRACE_SYSCALL(name, PARAMS(proto), PARAMS(args), \
456 cpu_online(raw_smp_processor_id()), \
457 PARAMS(void *__data, proto))
458
459 #define TRACE_EVENT_FLAGS(event, flag)
460
461 #define TRACE_EVENT_PERF_PERM(event, expr...)
462
463 #endif /* DECLARE_TRACE */
464
465 #ifndef TRACE_EVENT
466 /*
467 * For use with the TRACE_EVENT macro:
468 *
469 * We define a tracepoint, its arguments, its printk format
470 * and its 'fast binary record' layout.
471 *
472 * Firstly, name your tracepoint via TRACE_EVENT(name : the
473 * 'subsystem_event' notation is fine.
474 *
475 * Think about this whole construct as the
476 * 'trace_sched_switch() function' from now on.
477 *
478 *
479 * TRACE_EVENT(sched_switch,
480 *
481 * *
482 * * A function has a regular function arguments
483 * * prototype, declare it via TP_PROTO():
484 * *
485 *
486 * TP_PROTO(struct rq *rq, struct task_struct *prev,
487 * struct task_struct *next),
488 *
489 * *
490 * * Define the call signature of the 'function'.
491 * * (Design sidenote: we use this instead of a
492 * * TP_PROTO1/TP_PROTO2/TP_PROTO3 ugliness.)
493 * *
494 *
495 * TP_ARGS(rq, prev, next),
496 *
497 * *
498 * * Fast binary tracing: define the trace record via
499 * * TP_STRUCT__entry(). You can think about it like a
500 * * regular C structure local variable definition.
501 * *
502 * * This is how the trace record is structured and will
503 * * be saved into the ring buffer. These are the fields
504 * * that will be exposed to user-space in
505 * * /sys/kernel/tracing/events/<*>/format.
506 * *
507 * * The declared 'local variable' is called '__entry'
508 * *
509 * * __field(pid_t, prev_pid) is equivalent to a standard declaration:
510 * *
511 * * pid_t prev_pid;
512 * *
513 * * __array(char, prev_comm, TASK_COMM_LEN) is equivalent to:
514 * *
515 * * char prev_comm[TASK_COMM_LEN];
516 * *
517 *
518 * TP_STRUCT__entry(
519 * __array( char, prev_comm, TASK_COMM_LEN )
520 * __field( pid_t, prev_pid )
521 * __field( int, prev_prio )
522 * __array( char, next_comm, TASK_COMM_LEN )
523 * __field( pid_t, next_pid )
524 * __field( int, next_prio )
525 * ),
526 *
527 * *
528 * * Assign the entry into the trace record, by embedding
529 * * a full C statement block into TP_fast_assign(). You
530 * * can refer to the trace record as '__entry' -
531 * * otherwise you can put arbitrary C code in here.
532 * *
533 * * Note: this C code will execute every time a trace event
534 * * happens, on an active tracepoint.
535 * *
536 *
537 * TP_fast_assign(
538 * memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
539 * __entry->prev_pid = prev->pid;
540 * __entry->prev_prio = prev->prio;
541 * memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
542 * __entry->next_pid = next->pid;
543 * __entry->next_prio = next->prio;
544 * ),
545 *
546 * *
547 * * Formatted output of a trace record via TP_printk().
548 * * This is how the tracepoint will appear under ftrace
549 * * plugins that make use of this tracepoint.
550 * *
551 * * (raw-binary tracing wont actually perform this step.)
552 * *
553 *
554 * TP_printk("task %s:%d [%d] ==> %s:%d [%d]",
555 * __entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
556 * __entry->next_comm, __entry->next_pid, __entry->next_prio),
557 *
558 * );
559 *
560 * This macro construct is thus used for the regular printk format
561 * tracing setup, it is used to construct a function pointer based
562 * tracepoint callback (this is used by programmatic plugins and
563 * can also by used by generic instrumentation like SystemTap), and
564 * it is also used to expose a structured trace record in
565 * /sys/kernel/tracing/events/.
566 *
567 * A set of (un)registration functions can be passed to the variant
568 * TRACE_EVENT_FN to perform any (un)registration work.
569 */
570
571 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)
572 #define DEFINE_EVENT(template, name, proto, args) \
573 DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
574 #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)\
575 DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
576 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
577 DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
578 #define DEFINE_EVENT_CONDITION(template, name, proto, \
579 args, cond) \
580 DECLARE_TRACE_CONDITION(name, PARAMS(proto), \
581 PARAMS(args), PARAMS(cond))
582
583 #define TRACE_EVENT(name, proto, args, struct, assign, print) \
584 DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
585 #define TRACE_EVENT_FN(name, proto, args, struct, \
586 assign, print, reg, unreg) \
587 DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
588 #define TRACE_EVENT_FN_COND(name, proto, args, cond, struct, \
589 assign, print, reg, unreg) \
590 DECLARE_TRACE_CONDITION(name, PARAMS(proto), \
591 PARAMS(args), PARAMS(cond))
592 #define TRACE_EVENT_CONDITION(name, proto, args, cond, \
593 struct, assign, print) \
594 DECLARE_TRACE_CONDITION(name, PARAMS(proto), \
595 PARAMS(args), PARAMS(cond))
596 #define TRACE_EVENT_SYSCALL(name, proto, args, struct, assign, \
597 print, reg, unreg) \
598 DECLARE_TRACE_SYSCALL(name, PARAMS(proto), PARAMS(args))
599
600 #define TRACE_EVENT_FLAGS(event, flag)
601
602 #define TRACE_EVENT_PERF_PERM(event, expr...)
603
604 #define DECLARE_EVENT_NOP(name, proto, args) \
605 static inline void trace_##name(proto) \
606 { } \
607 static inline bool trace_##name##_enabled(void) \
608 { \
609 return false; \
610 }
611
612 #define TRACE_EVENT_NOP(name, proto, args, struct, assign, print) \
613 DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
614
615 #define DECLARE_EVENT_CLASS_NOP(name, proto, args, tstruct, assign, print)
616 #define DEFINE_EVENT_NOP(template, name, proto, args) \
617 DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
618
619 #endif /* ifdef TRACE_EVENT (see note above) */
Kernel DRM miscellaneous fixes and cross-tree changes