RE: [PATCH RESEND] memory hotplug: fix a double register sectioninfo bug

From: Luck, Tony
Date: Fri Sep 14 2012 - 12:24:28 EST


> This is an unusual configuration but it's not unheard of. PPC64 in rare
> (and usually broken) configurations can have one node span another. Tony
> should know if such a configuration is normally allowed on Itanium or if
> this should be considered a platform bug. Tony?

We definitely have platforms where the physical memory on node 0
that we skipped to leave physical address space for PCI mem mapped
devices gets tagged back at the very top of memory, after other nodes.

E.g. A 2-node system with 8G on each might look like this:

0-2G RAM on node 0
2G-4G PCI map space
4G-8G RAM on node 0
8G-16GRAM on node 1
16G-18G RAM on node 0

Is this the situation that we are talking about? Or something different?

-Tony
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