[RFC PATCH 2/3] topology: support node_numa_mem() for determining the fallback node

[Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>]

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>

diff --git a/include/linux/topology.h b/include/linux/topology.h
index 12ae6ce..a6d5438 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -233,11 +233,20 @@ static inline int numa_node_id(void)
  * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem().
  */
 DECLARE_PER_CPU(int, _numa_mem_);
+int _node_numa_mem_[MAX_NUMNODES];
 
 #ifndef set_numa_mem
 static inline void set_numa_mem(int node)
 {
 	this_cpu_write(_numa_mem_, node);
+	_node_numa_mem_[numa_node_id()] = node;
+}
+#endif
+
+#ifndef get_numa_mem
+static inline int get_numa_mem(int node)
+{
+	return _node_numa_mem_[node];
 }
 #endif
 
@@ -260,6 +269,7 @@ static inline int cpu_to_mem(int cpu)
 static inline void set_cpu_numa_mem(int cpu, int node)
 {
 	per_cpu(_numa_mem_, cpu) = node;
+	_node_numa_mem_[numa_node_id()] = node;
 }
 #endif
 
@@ -273,6 +283,13 @@ static inline int numa_mem_id(void)
 }
 #endif
 
+#ifndef get_numa_mem
+static inline int get_numa_mem(int node)
+{
+	return node;
+}
+#endif
+
 #ifndef cpu_to_mem
 static inline int cpu_to_mem(int cpu)
 {
-- 
1.7.9.5

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