linux-kernel - [PATCH v3 2/6] mm/numa: Skip NUMA_NO_NODE and online nodes in numa_map_to_online

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Message-ID: <157954697957.2239526.17206272633668977957.stgit@dwillia2-desk3.amr.corp.intel.com>
Date:   Mon, 20 Jan 2020 11:02:59 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     tglx@...utronix.de, mingo@...hat.com
Cc:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        "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-nvdimm@...ts.01.org,
        x86@...nel.org
Subject: [PATCH v3 2/6] 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>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
Link: https://lore.kernel.org/r/157401275716.43284.13185549705765009174.stgit@dwillia2-desk3.amr.corp.intel.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 4cff069279f6..30d76db718bf 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)) {