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SubjectRe: [PATCH 28/31] memblock: Export MEMBLOCK_ERROR again
On 07/27/2010 10:19 PM, Benjamin Herrenschmidt wrote:
>
> Screw it, I don't like it but I'll just split your patch in two for now
> and keep 0. It's a bit fishy but memblock does mostly top-down
> allocations and so shouldn't hit 0, and in practice the region at 0 is,
> I beleive, reserved, but we need to be extra careful and might need to
> revisit that a bit.
>
> That's an area where I don't completely agree with Linus, ie, 0 is a
> perfectly valid physical address for memblock to return :-)
>

On x86, physical address 0 contains the real-mode IVT and will thus be
reserved, at least for the forseeable future. Other architectures may
very well have non-special RAM there.

-hpa

--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.



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