62 lines · c
1#ifndef IOU_ALLOC_CACHE_H2#define IOU_ALLOC_CACHE_H3 4/*5 * Don't allow the cache to grow beyond this size.6 */7#define IO_ALLOC_CACHE_MAX 1288 9static inline bool io_alloc_cache_put(struct io_alloc_cache *cache,10 void *entry)11{12 if (cache->nr_cached < cache->max_cached) {13 if (!kasan_mempool_poison_object(entry))14 return false;15 cache->entries[cache->nr_cached++] = entry;16 return true;17 }18 return false;19}20 21static inline void *io_alloc_cache_get(struct io_alloc_cache *cache)22{23 if (cache->nr_cached) {24 void *entry = cache->entries[--cache->nr_cached];25 26 kasan_mempool_unpoison_object(entry, cache->elem_size);27 return entry;28 }29 30 return NULL;31}32 33/* returns false if the cache was initialized properly */34static inline bool io_alloc_cache_init(struct io_alloc_cache *cache,35 unsigned max_nr, size_t size)36{37 cache->entries = kvmalloc_array(max_nr, sizeof(void *), GFP_KERNEL);38 if (cache->entries) {39 cache->nr_cached = 0;40 cache->max_cached = max_nr;41 cache->elem_size = size;42 return false;43 }44 return true;45}46 47static inline void io_alloc_cache_free(struct io_alloc_cache *cache,48 void (*free)(const void *))49{50 void *entry;51 52 if (!cache->entries)53 return;54 55 while ((entry = io_alloc_cache_get(cache)) != NULL)56 free(entry);57 58 kvfree(cache->entries);59 cache->entries = NULL;60}61#endif62