Christoph Hellwig wrote:

quoted

To repeat what I said in IRC ... ;-)

Actually, you could check this with the pfns being the same when >> MAX_ORDER-1.
We should be aligned on a MAX_ORDER boundary, I think.

However, pfn_to_page(page_to_pfn(page) + 1) might be safer. If rather slower.

I think this is the wrong level of interface exposed.  Just add two hepler
kmap_atomic_sg/kunmap_atomic_sg that gurantee to map/unmap a sg list entry,
even if it's bigger than a page.

Why bother mapping anything larger than a page, when none of the users 
need it?

	Jeff



P.S. In your scheme you would need four helpers; you forgot kmap_sg() 
and kunmap_sg().
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