linux-kernel - [PATCH v2 1/7] x86, numa: Move definition of find_near_online

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Date:	Thu, 10 Sep 2015 12:27:43 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	<tj@...nel.org>, <jiang.liu@...ux.intel.com>,
	<mika.j.penttila@...il.com>, <mingo@...hat.com>,
	<akpm@...ux-foundation.org>, <rjw@...ysocki.net>, <hpa@...or.com>,
	<yasu.isimatu@...il.com>, <isimatu.yasuaki@...fujitsu.com>,
	<kamezawa.hiroyu@...fujitsu.com>, <izumi.taku@...fujitsu.com>,
	<gongzhaogang@...pur.com>, <qiaonuohan@...fujitsu.com>
CC:	<tangchen@...fujitsu.com>, <x86@...nel.org>,
	<linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>
Subject: [PATCH v2 1/7] x86, numa: Move definition of find_near_online_node() forward.

Will call this function earlier in next coming patches.
So simply move its definition forward. And also, add comments for it.

Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
---
 arch/x86/mm/numa.c | 47 +++++++++++++++++++++++++++++------------------
 1 file changed, 29 insertions(+), 18 deletions(-)

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 4053bb5..fea387a 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -78,6 +78,35 @@ EXPORT_SYMBOL(node_to_cpumask_map);
 DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
 
+/**
+ * find_near_online_node - Find the best near online node of a node.
+ * @node: NUMA node ID of the current node.
+ *
+ * Find the best near online node of @node, based on node_distance[] array.
+ * The best near online node is the backup node for memory allocation on
+ * one node.
+ *
+ * RETURNS:
+ * The best near online node ID on success, -1 on failure.
+ */
+static __init int find_near_online_node(int node)
+{
+	int n, val;
+	int min_val = INT_MAX;
+	int near_node = -1;
+
+	for_each_online_node(n) {
+		val = node_distance(node, n);
+
+		if (val < min_val) {
+			min_val = val;
+			near_node = n;
+		}
+	}
+
+	return near_node;
+}
+
 void numa_set_node(int cpu, int node)
 {
 	int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
@@ -702,24 +731,6 @@ void __init x86_numa_init(void)
 	numa_init(dummy_numa_init);
 }
 
-static __init int find_near_online_node(int node)
-{
-	int n, val;
-	int min_val = INT_MAX;
-	int best_node = -1;
-
-	for_each_online_node(n) {
-		val = node_distance(node, n);
-
-		if (val < min_val) {
-			min_val = val;
-			best_node = n;
-		}
-	}
-
-	return best_node;
-}
-
 /*
  * Setup early cpu_to_node.
  *
-- 
1.9.3

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