- struct lttng_event_notifier_enabler *event_notifier_enabler;
- struct lttng_kernel_event_notifier_private *event_notifier_priv;
-
- list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
- lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
-
- /*
- * For each event_notifier, if at least one of its enablers is enabled,
- * we enable the event_notifier, else we disable it.
- */
- list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
- struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub;
- struct lttng_enabler_ref *enabler_ref;
- struct lttng_bytecode_runtime *runtime;
- int enabled = 0, has_enablers_without_filter_bytecode = 0;
- int nr_filters = 0, nr_captures = 0;
-
- switch (event_notifier_priv->parent.instrumentation) {
- case LTTNG_KERNEL_ABI_TRACEPOINT: /* Fall-through */
- case LTTNG_KERNEL_ABI_SYSCALL:
- /* Enable event_notifiers */
- list_for_each_entry(enabler_ref,
- &event_notifier_priv->parent.enablers_ref_head, node) {
- if (enabler_ref->ref->enabled) {
- enabled = 1;
- break;
- }
- }
- break;
-
- default:
- /* Not handled with sync. */
- continue;
- }
-
- WRITE_ONCE(event_notifier->parent.enabled, enabled);
- /*
- * Sync tracepoint registration with event_notifier enabled
- * state.
- */
- if (enabled) {
- if (!event_notifier_priv->parent.registered)
- register_event_notifier(event_notifier);
- } else {
- if (event_notifier_priv->parent.registered)
- _lttng_event_notifier_unregister(event_notifier);
- }
-
- /* Check if has enablers without bytecode enabled */
- list_for_each_entry(enabler_ref,
- &event_notifier_priv->parent.enablers_ref_head, node) {
- if (enabler_ref->ref->enabled
- && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
- has_enablers_without_filter_bytecode = 1;
- break;
- }
- }
- event_notifier_priv->parent.has_enablers_without_filter_bytecode =
- has_enablers_without_filter_bytecode;
-
- /* Enable filters */
- list_for_each_entry(runtime,
- &event_notifier_priv->parent.filter_bytecode_runtime_head, node) {
- lttng_bytecode_sync_state(runtime);
- nr_filters++;
- }
- WRITE_ONCE(event_notifier_priv->parent.pub->eval_filter,
- !(has_enablers_without_filter_bytecode || !nr_filters));