#ifndef IOU_ALLOC_CACHE_H#define IOU_ALLOC_CACHE_H /* * Don't allow the cache to grow beyond this size. */#define IO_ALLOC_CACHE_MAX	128 static inline bool io_alloc_cache_put(struct io_alloc_cache *cache,				      void *entry){	if (cache->nr_cached < cache->max_cached) {		if (!kasan_mempool_poison_object(entry))			return false;		cache->entries[cache->nr_cached++] = entry;		return true;	}	return false;} static inline void *io_alloc_cache_get(struct io_alloc_cache *cache){	if (cache->nr_cached) {		void *entry = cache->entries[--cache->nr_cached]; 		kasan_mempool_unpoison_object(entry, cache->elem_size);		return entry;	} 	return NULL;} /* returns false if the cache was initialized properly */static inline bool io_alloc_cache_init(struct io_alloc_cache *cache,				       unsigned max_nr, size_t size){	cache->entries = kvmalloc_array(max_nr, sizeof(void *), GFP_KERNEL);	if (cache->entries) {		cache->nr_cached = 0;		cache->max_cached = max_nr;		cache->elem_size = size;		return false;	}	return true;} static inline void io_alloc_cache_free(struct io_alloc_cache *cache,				       void (*free)(const void *)){	void *entry; 	if (!cache->entries)		return; 	while ((entry = io_alloc_cache_get(cache)) != NULL)		free(entry); 	kvfree(cache->entries);	cache->entries = NULL;}#endif