kernel/trace/trace_events.c

956 static void __get_system_dir(struct trace_subsystem_dir *dir)
958 	WARN_ON_ONCE(dir->ref_count == 0);
959 	dir->ref_count++;
960 	__get_system(dir->subsystem);
963 static void __put_system_dir(struct trace_subsystem_dir *dir)
965 	WARN_ON_ONCE(dir->ref_count == 0);
966 	/* If the subsystem is about to be freed, the dir must be too */
967 	WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1);
969 	__put_system(dir->subsystem);
970 	if (!--dir->ref_count)
971 		kfree(dir);
974 static void put_system(struct trace_subsystem_dir *dir)
977 	__put_system_dir(dir);
981 static void remove_subsystem(struct trace_subsystem_dir *dir)
983 	if (!dir)
986 	if (!--dir->nr_events) {
987 		eventfs_remove_dir(dir->ei);
988 		list_del(&dir->list);
989 		__put_system_dir(dir);
1453 	struct trace_subsystem_dir *dir = filp->private_data;
1454 	struct event_subsystem *system = dir->subsystem;
1457 	struct trace_array *tr = dir->tr;
1499 	struct trace_subsystem_dir *dir = filp->private_data;
1500 	struct event_subsystem *system = dir->subsystem;
1509 	ret = tracing_update_buffers(dir->tr);
1523 	ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val);
1757 	struct trace_subsystem_dir *dir = NULL, *iter_dir;
1773 				dir = iter_dir;
1774 				if (dir->nr_events) {
1775 					__get_system_dir(dir);
1776 					system = dir->subsystem;
1791 		put_system(dir);
1798 		put_system(dir);
1806 	struct trace_subsystem_dir *dir;
1810 	/* Make a temporary dir that has no system but points to tr */
1811 	dir = kzalloc(sizeof(*dir), GFP_KERNEL);
1812 	if (!dir)
1817 		kfree(dir);
1820 	dir->tr = tr;
1821 	filp->private_data = dir;
1828 	struct trace_subsystem_dir *dir = file->private_data;
1830 	trace_array_put(dir->tr);
1833 	 * If dir->subsystem is NULL, then this is a temporary
1837 	if (dir->subsystem)
1838 		put_system(dir);
1840 		kfree(dir);
1849 	struct trace_subsystem_dir *dir = filp->private_data;
1850 	struct event_subsystem *system = dir->subsystem;
1876 	struct trace_subsystem_dir *dir = filp->private_data;
1887 	err = apply_subsystem_event_filter(dir, buf);
2364 	struct trace_subsystem_dir *dir;
2378 	/* First see if we did not already create this dir */
2379 	list_for_each_entry(dir, &tr->systems, list) {
2380 		system = dir->subsystem;
2382 			dir->nr_events++;
2383 			file->system = dir;
2384 			return dir->ei;
2397 	dir = kmalloc(sizeof(*dir), GFP_KERNEL);
2398 	if (!dir)
2414 	ei = eventfs_create_dir(name, parent, system_entries, nr_entries, dir);
2421 	dir->ei = ei;
2422 	dir->tr = tr;
2423 	dir->ref_count = 1;
2424 	dir->nr_events = 1;
2425 	dir->subsystem = system;
2426 	file->system = dir;
2428 	list_add(&dir->list, &tr->systems);
2430 	return dir->ei;
2433 	kfree(dir);
2436 	if (!dir || !system)
4198 	struct trace_subsystem_dir *dir;
4254 	list_for_each_entry(dir, &tr->systems, list) {
4256 		system = dir->subsystem;