Hello, On Wednesday, June 13, 2012 8:52 PM Daniel Vetter wrote: > On Wed, Jun 13, 2012 at 01:50:13PM +0200, Marek Szyprowski wrote: > > This patch adds DMA_ATTR_NO_KERNEL_MAPPING attribute which lets the > > platform to avoid creating a kernel virtual mapping for the allocated > > buffer. On some architectures creating such mapping is non-trivial task > > and consumes very limited resources (like kernel virtual address space > > or dma consistent address space). Buffers allocated with this attribute > > can be only passed to user space by calling dma_mmap_attrs(). > > > > Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> > > Reviewed-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> > > Looks like a nice little extension to support dma-buf for the common case, > so: > > Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx> > > One question is whether we should go right ahead and add kmap support for > this, too (with a default implementation that simply returns a pointer to > the coherent&contigous dma mem), but I guess that can wait until a > use-case pops up. I will wait with this until there will be real use cases. Let's get the patch into mainline first. Best regards -- Marek Szyprowski Samsung Poland R&D Center -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>