Re: [RFC][patch 0/2] mm: remove PageReserved

[Linus Torvalds]

On Tue, 9 Aug 2005, Russell King wrote:

> On Tue, Aug 09, 2005 at 07:38:52AM -0700, Martin J. Bligh wrote:
> > pfn_valid() doesn't tell you it's RAM or not - it tells you whether you
> > have a backing struct page for that address. Could be an IO mapped device,
> > a small memory hole, whatever.
> 
> The only things which have a struct page is RAM.  Nothing else does.

That's not true.

We have "struct page" show up for the ISA legacy MMIO region too, for 
example.

		Linus
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