Yisheng Xie d0c8ba40c6 swiotlb: update comments to refer to physical instead of virtual addresses
swiotlb use physical address of bounce buffer when do map and unmap,
therefore, related comment should be updated.

Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2018-05-09 09:35:20 +02:00
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