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CONFIG_NUMA was meant to (and did at one point) support both NUMA and flat
machines. This is essential in order for the distros to support it - same
will go for sparsemem.

That's a different issue.  The current code works if you boot a NUMA=y
SPARSEMEM=y machine with a single node.  The current Kconfig options
also enforce that SPARSEMEM depends on NUMA on i386.

Magnus would like to enable SPARSEMEM=y while CONFIG_NUMA=n.  That
requires some Kconfig changes, as well as an extra memory present call.
I'm questioning why we need to do that when we could never do
DISCONTIG=y while NUMA=n on i386.

Ah, OK - makes more sense. However, some machines do have large holes
in e820 map setups - is not really critical, more of an efficiency
thing.

Confused.   Does all this mean that we want the patch, or not?

From that POV, nothing urgent, and would require more work to make use

of it anyway. Not sure if Magnus had another more immediate use for it?

M.
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