*/static bool __init debug_objects_replace_static_objects(struct kmem_cache *cache){	struct debug_bucket *db = obj_hash;	struct hlist_node *tmp;	struct debug_obj *obj;	HLIST_HEAD(objects);	int i; 	for (i = 0; i < ODEBUG_POOL_SIZE; i += ODEBUG_BATCH_SIZE) {		if (!kmem_alloc_batch(&objects, cache, GFP_KERNEL))			goto free;		pool_push_batch(&pool_global, &objects);	} 	/* Disconnect the boot pool. */	pool_boot.first = NULL; 	/* Replace the active object references */	for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) {		hlist_move_list(&db->list, &objects); 		hlist_for_each_entry(obj, &objects, node) {			struct debug_obj *new = pcpu_alloc(); 			/* copy object data */			*new = *obj;			hlist_add_head(&new->node, &db->list);		}	}	return true;free:	/* Can't use free_object_list() as the cache is not populated yet */	hlist_for_each_entry_safe(obj, tmp, &pool_global.objects, node) {		hlist_del(&obj->node);		kmem_cache_free(cache, obj);	}	return false;} /* * Called after the kmem_caches are functional to setup a dedicated * cache pool, which has the SLAB_DEBUG_OBJECTS flag set. This flag * prevents that the debug code is called on kmem_cache_free() for the * debug tracker objects to avoid recursive calls. */void __init debug_objects_mem_init(void){	struct kmem_cache *cache;	int extras; 	if (!debug_objects_enabled)		return; 	if (!debug_objects_selftest())		return; 	cache = kmem_cache_create("debug_objects_cache", sizeof (struct debug_obj), 0,				  SLAB_DEBUG_OBJECTS | SLAB_NOLEAKTRACE, NULL); 	if (!cache || !debug_objects_replace_static_objects(cache)) {		debug_objects_enabled = false;		pr_warn("Out of memory.\n");		return;	} 	/*	 * Adjust the thresholds for allocating and freeing objects	 * according to the number of possible CPUs available in the	 * system.	 */	extras = num_possible_cpus() * ODEBUG_BATCH_SIZE;	pool_global.max_cnt += extras;	pool_global.min_cnt += extras; 	/* Everything worked. Expose the cache */	obj_cache = cache;	static_branch_enable(&obj_cache_enabled); #ifdef CONFIG_HOTPLUG_CPU	cpuhp_setup_state_nocalls(CPUHP_DEBUG_OBJ_DEAD, "object:offline", NULL,				  object_cpu_offline);#endif	return;}

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