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    SubjectRe: [patch] Introduce CONFIG_HAS_DMA.
    On Wed, 30 May 2007 14:40:02 -0700,
    "Williams, Dan J" <dan.j.williams@intel.com> wrote:

    > With the patch non-dma-architectures that try to build code with true
    > dependencies on the DMA api will fail to link i.e.:
    >
    > CONFIG_DMA_ENGINE=y CONFIG_HAS_DMA=n ASYNC_MEMCPY=y
    > CC init/version.o
    > LD init/built-in.o
    > LD .tmp_vmlinux1
    > async_tx/built-in.o: In function `async_memcpy':
    > xor.c:(.text+0x770): undefined reference to `dma_map_page'
    > xor.c:(.text+0x798): undefined reference to `dma_map_page'
    > xor.c:(.text+0x968): undefined reference to `dma_map_page'
    >
    > Now changing CONFIG_DMA_ENGINE to depend on HAS_DMA (which is more
    > correct than saying !S390).

    Makes sense.

    > Results in:
    > CONFIG_DMA_ENGINE=n CONFIG_HAS_DMA=n ASYNC_MEMCPY=y
    > CC init/version.o
    > LD init/built-in.o
    > LD .tmp_vmlinux1
    > KSYM .tmp_kallsyms1.S
    > AS .tmp_kallsyms1.o
    > LD .tmp_vmlinux2
    > KSYM .tmp_kallsyms2.S
    > AS .tmp_kallsyms2.o
    > LD vmlinux
    >
    > This also allows include/asm-s390/dma-mapping.h to be dropped.

    Cool. Thanks for looking into that.
    -
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