Messages in this thread | | | Subject | Re: [PATCH] Documenation/vm/numa | From | (Eric W. Biederman) | Date | 19 Apr 2002 14:25:50 -0600 |
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"Martin J. Bligh" <Martin.Bligh@us.ibm.com> writes: > > 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).
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