Jonathan Cameron [off-list ref] writes:

[...]

I'll test it when back in the office, but I had a similar issue with
memory only nodes when I moved the SRAT listing for cpus from the 4
4th mode to the 3rd node to fake some memory I could hot unplug.
This gave a memory only node for the last node on the system.

When I instead moved cpus from the 3rd node to the 4th (so the node
with only memory was now in the middle, everything worked).

Was odd, and I'd been meaning to chase it down but hadn't gotten to it
yet.  If I get time I'll put together some test firmwares as see if there
are any other nasty corner cases we aren't handling.

If you get a chance, it'd be really helpful to test reversing the
ordering of entries in the SRAT and booting with a restricted
NR_CPUS.

This issue was found through code inspection.

Please make sure to use the updated patch from Lorenzo for your
tests[0].

[0] https://marc.info/?l=linux-acpi&m=152998665713983&w=2

Jonathan

quoted

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