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


    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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