Subject: [PATCH 2/3] powerpc/numa: Prefer node id queried from vphn

From: Srikar Dronamraju <[email-masked]>
Date: Wed, 11 Mar 2020 16:32:36 +0530

Node id queried from the static device tree may not
be correct. For example: it may always show 0 on a shared processor.
Hence prefer the node id queried from vphn and fallback on the device tree
based node id if vphn query fails.

Cc: [email-masked]
Cc: [email-masked]
Cc: [email-masked]
Cc: Michal Hocko <[email-masked]>
Cc: Mel Gorman <[email-masked]>
Cc: Vlastimil Babka <[email-masked]>
Cc: "Kirill A. Shutemov" <[email-masked]>
Cc: Christopher Lameter <[email-masked]>
Cc: Michael Ellerman <[email-masked]>
Cc: Andrew Morton <[email-masked]>
Cc: Linus Torvalds <[email-masked]>
Signed-off-by: Srikar Dronamraju <[email-masked]>
---
 arch/powerpc/mm/numa.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 54dcd49..8735fed 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -719,20 +719,20 @@ static int __init parse_numa_properties(void)
 	 */
 	for_each_present_cpu(i) {
 		struct device_node *cpu;
-		int nid;
-
-		cpu = of_get_cpu_node(i, NULL);
-		BUG_ON(!cpu);
-		nid = of_node_to_nid_single(cpu);
-		of_node_put(cpu);
+		int nid = vphn_get_nid(i);
 
 		/*
 		 * Don't fall back to default_nid yet -- we will plug
 		 * cpus into nodes once the memory scan has discovered
 		 * the topology.
 		 */
-		if (nid < 0)
-			continue;
+		if (nid == NUMA_NO_NODE) {
+			cpu = of_get_cpu_node(i, NULL);
+			if (cpu) {
+				nid = of_node_to_nid_single(cpu);
+				of_node_put(cpu);
+			}
+		}
 		node_set_online(nid);
 	}
 
-- 
1.8.3.1