kernel/trace/trace.c

340 trace_process_export(struct trace_export *export,
346 	if (export->flags & flag) {
349 		export->write(export, entry, size);
361 static inline void ftrace_exports_enable(struct trace_export *export)
363 	if (export->flags & TRACE_EXPORT_FUNCTION)
366 	if (export->flags & TRACE_EXPORT_EVENT)
369 	if (export->flags & TRACE_EXPORT_MARKER)
373 static inline void ftrace_exports_disable(struct trace_export *export)
375 	if (export->flags & TRACE_EXPORT_FUNCTION)
378 	if (export->flags & TRACE_EXPORT_EVENT)
381 	if (export->flags & TRACE_EXPORT_MARKER)
387 	struct trace_export *export;
391 	export = rcu_dereference_raw_check(ftrace_exports_list);
392 	while (export) {
393 		trace_process_export(export, event, flag);
394 		export = rcu_dereference_raw_check(export->next);
401 add_trace_export(struct trace_export **list, struct trace_export *export)
403 	rcu_assign_pointer(export->next, *list);
405 	 * We are entering export into the list but another
407 	 * the export->next pointer is valid before another CPU sees
408 	 * the export pointer included into the list.
410 	rcu_assign_pointer(*list, export);
414 rm_trace_export(struct trace_export **list, struct trace_export *export)
419 		if (*p == export)
422 	if (*p != export)
431 add_ftrace_export(struct trace_export **list, struct trace_export *export)
433 	ftrace_exports_enable(export);
435 	add_trace_export(list, export);
439 rm_ftrace_export(struct trace_export **list, struct trace_export *export)
443 	ret = rm_trace_export(list, export);
444 	ftrace_exports_disable(export);
449 int register_ftrace_export(struct trace_export *export)
451 	if (WARN_ON_ONCE(!export->write))
456 	add_ftrace_export(&ftrace_exports_list, export);
464 int unregister_ftrace_export(struct trace_export *export)
470 	ret = rm_ftrace_export(&ftrace_exports_list, export);