Subject: [PATCH 2/2] powerpc/numa: Return the first online node if device tree mapping returns a not online node

From: "Aneesh Kumar K.V" <[email-masked]>
Date: Thu, 23 Jun 2022 18:24:42 +0530

While building the cpu_to_node map make sure we always use the online node
to build the mapping table. In general this should not be an issue
because the kernel use similar lookup mechanism (vphn_get_nid()) to mark
nodes online (setup_node_data()). Hence NUMA nodes we find during
lookup in numa_setup_cpu() will always be found online.

To keep logic simpler/correct, make sure that if the hypervisor
or device tree returned a not online node, don't use that to build
the map table. Instead, use the first_online_node.

Signed-off-by: Aneesh Kumar K.V <[email-masked]>
---
 arch/powerpc/mm/numa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 0801b2ce9b7d..f387b9eb9dc9 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -741,7 +741,7 @@ static int numa_setup_cpu(unsigned long lcpu)
 	of_node_put(cpu);
 
 out_present:
-	if (nid < 0 || !node_possible(nid))
+	if (nid < 0 || !node_online(nid))
 		nid = first_online_node;
 
 	/*
-- 
2.36.1