Re: mm: BUG in do_huge_pmd_wp_page

[H. Peter Anvin]

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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