Hi Andrew, On Wednesday, February 22, 2012 1:18 AM Andrew Morton wrote: > > This patch adds support for CMA to dma-mapping subsystem for x86 > > architecture that uses common pci-dma/pci-nommu implementation. This > > allows to test CMA on KVM/QEMU and a lot of common x86 boxes. > > > > ... > > > > --- a/arch/x86/Kconfig > > +++ b/arch/x86/Kconfig > > @@ -31,6 +31,7 @@ config X86 > > select ARCH_WANT_OPTIONAL_GPIOLIB > > select ARCH_WANT_FRAME_POINTERS > > select HAVE_DMA_ATTRS > > + select HAVE_DMA_CONTIGUOUS if !SWIOTLB > > select HAVE_KRETPROBES > > select HAVE_OPTPROBES > > select HAVE_FTRACE_MCOUNT_RECORD > > I don't think it's compilable at all for x86_64, because that platform > selects SWIOTLB. Right, x86 support is very basic, mainly for being able to test it on standard configuration with QEmu. > After a while I got it to compile for i386. arm didn't go so well, > partly because arm allmodconfig is presently horked (something to do > with Kconfig not setting PHYS_OFFSET) and partly because arm defconfig > doesn't permit CMA to be set. Got bored, gave up. I think that all*config are broken on ARM. To enable CMA compilation, one need to select a subplatform based on ARMv6+ - for example one can start from arch/arm/configs/exynos4_defconfig and then use oldnoconfig. > The patchset collides pretty seriously with pending dma api changes and > pending arm changes in linux-next, so I didn't apply anything. This > will all need to be looked at, please. > > I'll make do with reading the patches for now ;) I've rebased the CMA patchset on top of next-20120222 kernel tree and I will send them soon as v23. I hope this will help getting them merged to your tree. If I should select different base for the patches, just let me know. 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>