Messages in this thread | | | Date | Thu, 25 Apr 2013 19:28:34 -0700 | From | "H. Peter Anvin" <> | Subject | Re: mm: BUG in do_huge_pmd_wp_page |
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On 04/24/2013 04:40 PM, Simon Jeons wrote: > > I see in memblock_trim_memory(): start = round_up(orig_start, align); > here align is PAGE_SIZE, so the dump of zone ranges in my machine is [ > 0.000000] DMA [mem 0x00001000-0x00ffffff]. Why PFN 0 is not > used? just for align? >
PFN 0 contains the real-mode interrupt vector table and BIOS data area, so we just reserve it. Avoids issues with zero being special, too.
-hpa
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