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dma-mapping: make support for dma ops optional

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Avoid the overhead of the dma ops support for tiny builds that only
use the direct mapping.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
This commit is contained in:
Christoph Hellwig 2020-07-08 09:30:00 +02:00
commit 2f9237d4f6
19 changed files with 43 additions and 6 deletions
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