Intel IOMMU: Iommu floppy workaround

This config option (DMAR_FLPY_WA) sets up 1:1 mapping for the floppy device so
that the floppy device which does not use DMA api's will continue to work.

Once the floppy driver starts using DMA api's this config option can be turn
off or this patch can be yanked out of kernel at that time.

[[email protected]: cleanups, rename things, build fix]
[[email protected]: Kconfig fixes]
Signed-off-by: Anil S Keshavamurthy <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Muli Ben-Yehuda <[email protected]>
Cc: "Siddha, Suresh B" <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: Ashok Raj <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Greg KH <[email protected]>
Signed-off-by: Jan Engelhardt <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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