numa: add generic percpu var numa_node_id() implementation

[pandora-kernel.git] / include / linux / topology.h

diff --git a/include/linux/topology.h b/include/linux/topology.h
index 5b81156..2e5518f 100644 (file)
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -31,6 +31,7 @@
 #include <linux/bitops.h>
 #include <linux/mmzone.h>
 #include <linux/smp.h>
+#include <linux/percpu.h>
 #include <asm/topology.h>
 
 #ifndef node_has_online_mem
@@ -203,8 +204,53 @@ int arch_update_cpu_topology(void);
 #ifndef SD_NODE_INIT
 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
 #endif
+
 #endif /* CONFIG_NUMA */
 
+#ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID
+DECLARE_PER_CPU(int, numa_node);
+
+#ifndef numa_node_id
+/* Returns the number of the current Node. */
+static inline int numa_node_id(void)
+{
+       return __this_cpu_read(numa_node);
+}
+#endif
+
+#ifndef cpu_to_node
+static inline int cpu_to_node(int cpu)
+{
+       return per_cpu(numa_node, cpu);
+}
+#endif
+
+#ifndef set_numa_node
+static inline void set_numa_node(int node)
+{
+       percpu_write(numa_node, node);
+}
+#endif
+
+#ifndef set_cpu_numa_node
+static inline void set_cpu_numa_node(int cpu, int node)
+{
+       per_cpu(numa_node, cpu) = node;
+}
+#endif
+
+#else  /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */
+
+/* Returns the number of the current Node. */
+#ifndef numa_node_id
+static inline int numa_node_id(void)
+{
+       return cpu_to_node(raw_smp_processor_id());
+}
+#endif
+
+#endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */
+
 #ifndef topology_physical_package_id
 #define topology_physical_package_id(cpu)      ((void)(cpu), -1)
 #endif
@@ -218,9 +264,4 @@ int arch_update_cpu_topology(void);
 #define topology_core_cpumask(cpu)             cpumask_of(cpu)
 #endif
 
-/* Returns the number of the current Node. */
-#ifndef numa_node_id
-#define numa_node_id()         (cpu_to_node(raw_smp_processor_id()))
-#endif
-
 #endif /* _LINUX_TOPOLOGY_H */