Tyrel Datwyler [off-list ref] writes:

quoted

--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c

@@ -897,7 +897,7 @@ static void __init find_possible_nodes(void)
 		return;

 	if (of_property_read_u32_index(rtas,
-				"ibm,max-associativity-domains",
+				"ibm,current-associativity-domains",

I'm not sure ibm,current-associativity-domains is guaranteed to exist on older
firmware. You may need check that it exists and fall back to
ibm,max-associativity-domains in the event it doesn't

Yes. Looks like it's a PowerVM-specific property.