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    SubjectRe: [PATCH] Documenation/vm/numa
    >> Note that there are two possible ways to define a pfn, in my mind.
    >> One would be page_phys_addr >> PAGE_SHIFT. The other would be the
    >> offset of the struct page for that page within the mythical mem_map
    >> array. I prefer the former, though it probably contradicts everyone
    >> else ;-) It's useful to have some way to pass around a 36 bit address
    >> inside a 32 bit field.
    >
    > A page frame number (pfn) is definitely the former
    > (page_phys_addr >> PAGE_SHIFT).

    That's how I'd conceptually define it ... unfortunately the latter
    definition
    also matches for non-discontigmem machines, and it's easy to think of
    it that way. I guess it's just everything that says "mapnr" in it that needs
    killing then ... I'm off to make some patches.

    M.

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