On Wed, Sep 02, 2009 at 06:10:44PM +0300, Imre Deak wrote: > To my understanding buffers returned by dma_alloc_*, kmalloc, vmalloc > are ok:
For dma_map_*, the only pages/addresses which are valid to pass are those returned by get_free_pages() or kmalloc. Everything else is not permitted. Use of vmalloc'd and dma_alloc_* pages with the dma_map_* APIs is invalid use of the DMA API. See the notes in the DMA-mapping.txt document against "dma_map_single". > For user mappings I think you'd have to do an additional flush for > the direct mapping, while the user mapping is flushed in dma_map_*. I will not accept a patch which adds flushing of anything other than the kernel direct mapping in the dma_map_* functions, so please find a different approach. -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
