hwbm_pool_add
num = hwbm_pool_add(hwbm_pool, hwbm_pool->size);
num = hwbm_pool_add(hwbm_pool, hwbm_pool->size);
int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num);
EXPORT_SYMBOL_GPL(hwbm_pool_add);