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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
