Subject: [PATCH v2 1/3] powerpc/mm/drconf: Use NUMA_NO_NODE on failures instead of node 0

From: "Aneesh Kumar K.V" <[email-masked]>
Date: Mon, 1 Jul 2019 20:06:24 +0530

If we fail to parse the associativity array we should default to
NUMA_NO_NODE instead of NODE 0. Rest of the code fallback to the
right default if we find the numa node value NUMA_NO_NODE.

Signed-off-by: Aneesh Kumar K.V <[email-masked]>
---
 arch/powerpc/mm/numa.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 917904d2fe97..aee718509085 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -416,17 +416,19 @@ static int of_get_assoc_arrays(struct assoc_arrays *aa)
 static int of_drconf_to_nid_single(struct drmem_lmb *lmb)
 {
 	struct assoc_arrays aa = { .arrays = NULL };
-	int default_nid = 0;
+	int default_nid = NUMA_NO_NODE;
 	int nid = default_nid;
 	int rc, index;
 
+	if (min_common_depth < 0)
+		return default_nid;
+
 	rc = of_get_assoc_arrays(&aa);
 	if (rc)
 		return default_nid;
 
-	if (min_common_depth > 0 && min_common_depth <= aa.array_sz &&
-	    !(lmb->flags & DRCONF_MEM_AI_INVALID) &&
-	    lmb->aa_index < aa.n_arrays) {
+	if (min_common_depth <= aa.array_sz &&
+	    !(lmb->flags & DRCONF_MEM_AI_INVALID) && lmb->aa_index < aa.n_arrays) {
 		index = lmb->aa_index * aa.array_sz + min_common_depth - 1;
 		nid = of_read_number(&aa.arrays[index], 1);
 
-- 
2.21.0