Re: [PATCH] Documenation/vm/numa

[Martin J. Bligh]

>> 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.