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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