Messages in this thread | | | Date | Tue, 9 Aug 2005 13:51:55 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [RFC][patch 0/2] mm: remove PageReserved |
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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.
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