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    SubjectRe: [PATCH 6/8 RESEND] drivers: add Contiguous Memory Allocator
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    On Tuesday 05 July 2011, Marek Szyprowski wrote:
    > The Contiguous Memory Allocator is a set of helper functions for DMA
    > mapping framework that improves allocations of contiguous memory chunks.
    >
    > CMA grabs memory on system boot, marks it with CMA_MIGRATE_TYPE and
    > gives back to the system. Kernel is allowed to allocate movable pages
    > within CMA's managed memory so that it can be used for example for page
    > cache when DMA mapping do not use it. On dma_alloc_from_contiguous()
    > request such pages are migrated out of CMA area to free required
    > contiguous block and fulfill the request. This allows to allocate large
    > contiguous chunks of memory at any time assuming that there is enough
    > free memory available in the system.
    >
    > This code is heavily based on earlier works by Michal Nazarewicz.
    >
    > Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
    > Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
    > CC: Michal Nazarewicz <mina86@mina86.com>

    Reviewed-by: Arnd Bergmann <arnd@arndb.de>, but I noticed two
    one-character mistakes:

    > +if CMA
    > +
    > +config CMA_DEBUG
    > + bool "CMA debug messages (DEVELOPEMENT)"

    s/DEVELOPEMENT/DEVELOPMENT/

    > diff --git a/drivers/base/Makefile b/drivers/base/Makefile
    > index 4c5701c..be6aab4 100644
    > --- a/drivers/base/Makefile
    > +++ b/drivers/base/Makefile
    > @@ -5,6 +5,7 @@ obj-y := core.o sys.o bus.o dd.o syscore.o \
    > cpu.o firmware.o init.o map.o devres.o \
    > attribute_container.o transport_class.o
    > obj-$(CONFIG_DEVTMPFS) += devtmpfs.o
    > +obj-$(CONFIG_CMA) += dma-contiguous.o
    > obj-y += power/
    > obj-$(CONFIG_HAS_DMA) += dma-mapping.o

    Please add another tab to indent the line in the same way as the others.

    Arnd


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