Currently, there are two users on CMA functionality, one is the DMA subsystem and the other is the kvm on powerpc. They have their own code to manage CMA reserved area even if they looks really similar. >From my guess, it is caused by some needs on bitmap management. Kvm side wants to maintain bitmap not for 1 page, but for more size. Eventually it use bitmap where one bit represents 64 pages. When I implement CMA related patches, I should change those two places to apply my change and it seem to be painful to me. I want to change this situation and reduce future code management overhead through this patch. This change could also help developer who want to use CMA in their new feature development, since they can use CMA easily without copying & pasting this reserved area management code. Now, we are in merge window, so this is not for merging. I'd like to listen opinion from people who related to this stuff before actually trying to merge this patchset. If all agree with this change, I will resend it after rc1. Thanks. Joonsoo Kim (3): CMA: generalize CMA reserved area management functionality DMA, CMA: use general CMA reserved area management framework PPC, KVM, CMA: use general CMA reserved area management framework arch/powerpc/kvm/book3s_hv_builtin.c | 17 +- arch/powerpc/kvm/book3s_hv_cma.c | 240 ------------------------- arch/powerpc/kvm/book3s_hv_cma.h | 27 --- drivers/base/Kconfig | 10 -- drivers/base/dma-contiguous.c | 230 ++---------------------- include/linux/cma.h | 28 +++ include/linux/dma-contiguous.h | 7 +- mm/Kconfig | 11 ++ mm/Makefile | 1 + mm/cma.c | 329 ++++++++++++++++++++++++++++++++++ 10 files changed, 396 insertions(+), 504 deletions(-) delete mode 100644 arch/powerpc/kvm/book3s_hv_cma.c delete mode 100644 arch/powerpc/kvm/book3s_hv_cma.h create mode 100644 include/linux/cma.h create mode 100644 mm/cma.c -- 1.7.9.5 -- 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>