Re: [PATCH 1/2] arm64: avoid alloc memory on offline node

[Punit Agrawal]

Jonathan Cameron <jonathan.cameron@xxxxxxxxxx> 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
>
>> 
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