Messages in this thread | | | Date | Wed, 18 Aug 2004 15:59:15 -0700 | From | William Lee Irwin III <> | Subject | Re: Does io_remap_page_range() take 5 or 6 args? |
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On Wed, Aug 18, 2004 at 03:00:01PM -0700, William Lee Irwin III wrote: > Or, if not pgoff_t, introduce a pfn_t for this purpose, an unsigned > arithmetic type of architecture-dependent width (such systems may not > want 64-bit page indices and the like for various reasons). But > exhibiting a system with the need for such is yet to be done, and in > fact, even with a 32B struct page, 16TB RAM (the minimum required to > trigger more physical address bits >= BITS_PER_LONG + PAGE_SHIFT) has > a 128GB mem_map[] with 4KB pages, an 8GB mem_map[] with 64KB pages, > and so will have far, far deeper support issues than pfn overflows. > Even supposing a kernel could be made to boot and the like, the massive > internal fragmentation from using a large enough emulated PAGE_SIZE to > get mem_map[] to fit within virtualspace will surely render such a > machine completely useless, likely to the point of being unable to run > userspace, or panicking much earlier from boot-time allocation failures.
Given this, will a pfn suffice?
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