On Tue, 13 Feb 2007, Andi Kleen wrote:

> The trouble with this is that you'll need to harden large parts
> of code against these.  Especially a NULL pgdat is something quite
> dangerous. You could make it a dummy empty pgdat, but just assigning it
> nearby seems easier.

Plus there is the issue of having a pgdat but without any valid zone in 
it. This is what triggered Kame-sans recent bug.

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