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The bitmap used to mark dma mappings can be quite large on systems with huge amounts of memory. Use virtual memory for this bitmap. Suggested-by: Alexander Schmidt <alexschm@de.ibm.com> Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>