Function fail_point_garbage_collect

freebsd/kern/kern_fail.c:358–388

Free up any zero-ref entries in the garbage queue */

/* Free up any zero-ref entries in the garbage queue */
static void
fail_point_garbage_collect(void)
{
	struct fail_point_setting *fs_current, *fs_next;
	struct fail_point_setting_garbage fp_ents_free_list;

	/**
	  * We will transfer the entries to free to fp_ents_free_list while holding
	  * the spin mutex, then free it after we drop the lock. This avoids
	  * triggering witness due to sleepable mutexes in the memory
	  * allocator.
	  */
	STAILQ_INIT(&fp_ents_free_list);

	mtx_lock_spin(&mtx_garbage_list);
	STAILQ_FOREACH_SAFE(fs_current, &fp_setting_garbage, fs_garbage_link,
	    fs_next) {
		if (fs_current->fs_parent->fp_setting != fs_current &&
		        fs_current->fs_parent->fp_ref_cnt == 0) {
			STAILQ_REMOVE(&fp_setting_garbage, fs_current,
			        fail_point_setting, fs_garbage_link);
			STAILQ_INSERT_HEAD(&fp_ents_free_list, fs_current,
			        fs_garbage_link);
		}
	}
	mtx_unlock_spin(&mtx_garbage_list);

	STAILQ_FOREACH_SAFE(fs_current, &fp_ents_free_list, fs_garbage_link,
	        fs_next)
		fail_point_setting_destroy(fs_current);
}

/* Drain out all refs from this fail point */
static inline void