ttm_dma_find_pool
pool = ttm_dma_find_pool(dev, type | IS_HUGE);
pool = ttm_dma_find_pool(dev, type);
is_cached = (ttm_dma_find_pool(pool->dev,
pool = ttm_dma_find_pool(dev, type | IS_HUGE);
pool = ttm_dma_find_pool(dev, type);