powerpc/pseries: Fix VPHN build errors on non-SMP systems

The header asm/hvcall.h was previously included indirectly via
smp.h. On non-SMP systems, however, these declarations are excluded
and the build breaks. This is easily fixed by including asm/hvcall.h
directly.

The VPHN feature is only meaningful on NUMA systems that implement
the SPLPAR option, so exclude the VPHN code on systems without
SPLPAR enabled.

Also, expose unmap_cpu_from_node() on systems with SPLPAR enabled,
even if CONFIG_HOTPLUG_CPU is disabled.

Lastly, map_cpu_to_node() is now needed by VPHN to manipulate the
node masks after boot time, so remove the __cpuinit annotation to
fix a section mismatch.

Signed-off-by: Jesse Larrew <jlarrew@linux.vnet.ibm.com>

Author: Jesse Larrew

arch/powerpc/include/asm/topology.h

@@ -93,9 +93,20 @@ extern void __init dump_numa_cpu_topology(void);
 extern int sysfs_add_device_to_node(struct sys_device *dev, int nid);
 extern void sysfs_remove_device_from_node(struct sys_device *dev, int nid);
 
+#ifdef CONFIG_PPC_SPLPAR
 extern int start_topology_update(void);
 extern int stop_topology_update(void);
 #else
+static inline int start_topology_update(void)
+{
+	return 0;
+}
+static inline int stop_topology_update(void)
+{
+	return 0;
+}
+#endif /* CONFIG_PPC_SPLPAR */
+#else
 
 static inline void dump_numa_cpu_topology(void) {}
 
@@ -108,15 +119,6 @@ static inline void sysfs_remove_device_from_node(struct sys_device *dev,
 						int nid)
 {
 }
-
-static inline int start_topology_update(void)
-{
-	return 0;
-}
-static inline int stop_topology_update(void)
-{
-	return 0;
-}
 #endif /* CONFIG_NUMA */
 
 #include <asm-generic/topology.h>

arch/powerpc/mm/numa.c

@@ -28,6 +28,7 @@
 #include <asm/smp.h>
 #include <asm/firmware.h>
 #include <asm/paca.h>
+#include <asm/hvcall.h>
 
 static int numa_enabled = 1;
 
@@ -167,7 +168,7 @@ static void __init get_node_active_region(unsigned long start_pfn,
 	work_with_active_regions(nid, get_active_region_work_fn, node_ar);
 }
 
-static void __cpuinit map_cpu_to_node(int cpu, int node)
+static void map_cpu_to_node(int cpu, int node)
 {
 	numa_cpu_lookup_table[cpu] = node;
 
@@ -177,7 +178,7 @@ static void __cpuinit map_cpu_to_node(int cpu, int node)
 		cpumask_set_cpu(cpu, node_to_cpumask_map[node]);
 }
 
-#ifdef CONFIG_HOTPLUG_CPU
+#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PPC_SPLPAR)
 static void unmap_cpu_from_node(unsigned long cpu)
 {
 	int node = numa_cpu_lookup_table[cpu];
@@ -191,7 +192,7 @@ static void unmap_cpu_from_node(unsigned long cpu)
 		       cpu, node);
 	}
 }
-#endif /* CONFIG_HOTPLUG_CPU */
+#endif /* CONFIG_HOTPLUG_CPU || CONFIG_PPC_SPLPAR */
 
 /* must hold reference to node during call */
 static const int *of_get_associativity(struct device_node *dev)
@@ -1289,6 +1290,7 @@ u64 memory_hotplug_max(void)
 #endif /* CONFIG_MEMORY_HOTPLUG */
 
 /* Vrtual Processor Home Node (VPHN) support */
+#ifdef CONFIG_PPC_SPLPAR
 #define VPHN_NR_CHANGE_CTRS (8)
 static u8 vphn_cpu_change_counts[NR_CPUS][VPHN_NR_CHANGE_CTRS];
 static cpumask_t cpu_associativity_changes_mask;
@@ -1531,3 +1533,4 @@ int stop_topology_update(void)
 	vphn_enabled = 0;
 	return del_timer_sync(&topology_timer);
 }
+#endif /* CONFIG_PPC_SPLPAR */