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contiguous shared memory

Hello realtimers

My understanding of shared memory under RT Linux is that it uses
vmalloc to allocate memory and therefore this memory may not be
suitable for DMA (the memory is not guaranteed contiguous).

(1) Is this the truth, the whole truth and nothing but the truth?
(2) Is there someway to use the shared memory implementation in a
    manner suitable for DMA?

Daniel
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