Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP

If you can write code that doesn't need any struct pages that would make
life a bit easier, since we wouldn't need any pseudo memory hotplug code
that just adds struct pages.

That was my gut feel too.  However, it seems from Carsten and Jörn
discussion of read/write XIP on Flash (and some new Phase Change)
memories that having the struct pages has a lot of potential benefits.
Wouldn't it also allow most of the mm routines to remain unchanged.
I just worry that it would be difficult to set apart these non
volitatile pages that can't be written too directly.

We would still need to add the kernel mapping though.

But that's handled by ioremap()ing it right?
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