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    SubjectRe: 2.6.22-rc1-mm1 - s390 vs. md
    On Fri, 18 May 2007 09:30:09 -0700,
    "Williams, Dan J" <dan.j.williams@intel.com> wrote:

    > When CONFIG_DMA_ENGINE=n async_tx_find_channel takes the form:
    > ... async_tx_find_channel( ... )
    > {
    > return NULL;
    > }
    >
    > So in the S390 case the entire asynchronous path will be compiled away.

    Unfortunately, do_async_xor() (and others) is not ifdef'ed and contains
    dma_map_page(), which led to the compile failure...
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