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SubjectRe: virt_to_page/pci_map_page vs. pci_map_single

> I really don't see what's to be gained by doing this. map_page is for
> mapping one page or a fragment of it. It's designed for small zero copy
> stuff, like networking. To get it to map more than one page, really we
> should pass in an array of struct pages.

As an aside it would be nice if networking used the map_sg infrastructure
for zero copy. Some architectures need to do things to make the DMA
mapping visible to IO and at the moment we do it for each map_page.

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