+static BLOCKING_NOTIFIER_HEAD(tracepoint_notify_list);
+
+/**
+ * register_tracepoint_notifier - register tracepoint coming/going notifier
+ * @nb: notifier block
+ *
+ * Notifiers registered with this function are called on module
+ * coming/going with the tracepoint_module_list_mutex held.
+ * The notifier block callback should expect a "struct tp_module" data
+ * pointer.
+ */
+int register_tracepoint_module_notifier(struct notifier_block *nb)
+{
+ struct tp_module *tp_mod;
+ int ret;
+
+ mutex_lock(&tracepoint_module_list_mutex);
+ ret = blocking_notifier_chain_register(&tracepoint_notify_list, nb);
+ if (ret)
+ goto end;
+ list_for_each_entry(tp_mod, &tracepoint_module_list, list)
+ (void) nb->notifier_call(nb, MODULE_STATE_COMING, tp_mod);
+end:
+ mutex_unlock(&tracepoint_module_list_mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(register_tracepoint_module_notifier);
+
+/**
+ * unregister_tracepoint_notifier - unregister tracepoint coming/going notifier
+ * @nb: notifier block
+ *
+ * The notifier block callback should expect a "struct tp_module" data
+ * pointer.
+ */
+int unregister_tracepoint_module_notifier(struct notifier_block *nb)
+{
+ struct tp_module *tp_mod;
+ int ret;
+
+ mutex_lock(&tracepoint_module_list_mutex);
+ ret = blocking_notifier_chain_unregister(&tracepoint_notify_list, nb);
+ if (ret)
+ goto end;
+ list_for_each_entry(tp_mod, &tracepoint_module_list, list)
+ (void) nb->notifier_call(nb, MODULE_STATE_GOING, tp_mod);
+end:
+ mutex_unlock(&tracepoint_module_list_mutex);
+ return ret;
+
+}
+EXPORT_SYMBOL_GPL(unregister_tracepoint_module_notifier);
+
+/*
+ * Ensure the tracer unregistered the module's probes before the module
+ * teardown is performed. Prevents leaks of probe and data pointers.
+ */
+static void tp_module_going_check_quiescent(struct tracepoint * const *begin,
+ struct tracepoint * const *end)
+{
+ struct tracepoint * const *iter;
+
+ if (!begin)
+ return;
+ for (iter = begin; iter < end; iter++)
+ WARN_ON_ONCE((*iter)->funcs);
+}
+