Re: [PATCH] i386: single node SPARSEMEM fix

["Martin J. Bligh" <mbligh@mbligh.org>]

>> >> 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.