Conduct some maintenance of the swiotlb code:
-- Move the code from arch/ia64/lib/ to lib/
-- Cleanup some cruft (code duplication)
-- Add support for syncing sub-ranges of mappings
-- Add support for syncing DMA_BIDIRECTIONAL mappings
-- Comment fixup & change record
Also, tack-on an x86_64 implementation of dma_sync_single_range_for_cpu
and dma_sync_single_range_for _device. This makes use of the new
swiotlb sync sub-range support.
In this (third) round, the new location for swiotlb is (again) lib/swiotlb.c.
This set does NOT include the PCI excision that Tony Luck started after the
last round of discussion.
Patches to follow...
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