Nick Piggin wrote:

> I'm currently playing around with trying to reuse an existing flag
> to get this information (instead of PageReserved). But it doesn't seem
> like a big problem if we have to fall back to the above.
> 

OK, with the attached patch (on top of the PageReserved removal patches)
things work nicely. However I'm not sure that I really like the use of
flags == 0xffffffff to indicate the page is unusable. For one thing it
may confuse things that walk physical pages, and for another it can
easily break if someone clears a flag of an 'unusable' page.

-- 
SUSE Labs, Novell Inc.