menuconfig DMABUF_HEAPS_DEFERRED_FREE bool "DMA-BUF heaps deferred-free library" help Choose this option to enable the DMA-BUF heaps deferred-free library. menuconfig DMABUF_HEAPS_PAGE_POOL bool "DMA-BUF heaps page-pool library" help Choose this option to enable the DMA-BUF heaps page-pool library. config DMABUF_HEAPS_SYSTEM tristate "DMA-BUF System Heap" depends on DMABUF_HEAPS && DMABUF_HEAPS_DEFERRED_FREE && DMABUF_HEAPS_PAGE_POOL help Choose this option to enable the system dmabuf heap. The system heap is backed by pages from the buddy allocator. If in doubt, say Y. config DMABUF_HEAPS_CMA tristate "DMA-BUF CMA Heap" depends on DMABUF_HEAPS && DMA_CMA help Choose this option to enable dma-buf CMA heap. This heap is backed by the Contiguous Memory Allocator (CMA). If your system has these regions, you should say Y here.