linux-kernel - [PATCH v2 15/18] mm/numa: Skip NUMA_NO_NODE and online nodes in numa_map_to_online

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Date:   Sun, 17 Nov 2019 09:45:57 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     linux-nvdimm@...ts.01.org
Cc:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        peterz@...radead.org, vishal.l.verma@...el.com,
        dave.hansen@...ux.intel.com, hch@....de,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-acpi@...r.kernel.org
Subject: [PATCH v2 15/18] mm/numa: Skip NUMA_NO_NODE and online nodes in
 numa_map_to_online_node()

Update numa_map_to_online_node() to stop falling back to numa node 0
when the input is NUMA_NO_NODE. Also, skip the lookup if @node is
online. This makes the routine compatible with other arch node mapping
routines.

Reported-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 mm/mempolicy.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index e2d8dd21ce9d..d618121bcc17 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -137,8 +137,8 @@ int numa_map_to_online_node(int node)
 {
 	int min_node;
 
-	if (node == NUMA_NO_NODE)
-		node = 0;
+	if (node == NUMA_NO_NODE || node_online(node))
+		return node;
 
 	min_node = node;
 	if (!node_online(node)) {