x86: unify 32 and 64-bit node_to_cpumask_map

Impact: cleanup

We take the 64-bit code and use it on 32-bit as well.  The new file
is called mm/numa.c.

In a minor cleanup, we use cpu_none_mask instead of declaring a local
cpu_mask_none.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

5 files changed, 83 insertions, 94 deletions

diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index 216a960d4f10..dc31d929da04 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -44,9 +44,6 @@
 
 #ifdef CONFIG_X86_32
 
-/* Mappings between node number and cpus on that node. */
-extern cpumask_t node_to_cpumask_map[];
-
 /* Mappings between logical cpu number and node number */
 extern int cpu_to_node_map[];
 
@@ -57,19 +54,8 @@ static inline int cpu_to_node(int cpu)
 }
 #define early_cpu_to_node(cpu)  cpu_to_node(cpu)
 
-/* Returns a bitmask of CPUs on Node 'node'. */
-static inline const struct cpumask *cpumask_of_node(int node)
-{
-        return &node_to_cpumask_map[node];
-}
-
-static inline void setup_node_to_cpumask_map(void) { }
-
 #else /* CONFIG_X86_64 */
 
-/* Mappings between node number and cpus on that node. */
-extern cpumask_t *node_to_cpumask_map;
-
 /* Mappings between logical cpu number and node number */
 DECLARE_EARLY_PER_CPU(int, x86_cpu_to_node_map);
 
@@ -80,7 +66,6 @@ DECLARE_PER_CPU(int, node_number);
 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
 extern int cpu_to_node(int cpu);
 extern int early_cpu_to_node(int cpu);
-extern const cpumask_t *cpumask_of_node(int node);
 
 #else   /* !CONFIG_DEBUG_PER_CPU_MAPS */
 
@@ -96,18 +81,25 @@ static inline int early_cpu_to_node(int cpu)
         return early_per_cpu(x86_cpu_to_node_map, cpu);
 }
 
+#endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
+
+#endif /* CONFIG_X86_64 */
+
+/* Mappings between node number and cpus on that node. */
+extern cpumask_t *node_to_cpumask_map;
+
+#ifdef CONFIG_DEBUG_PER_CPU_MAPS
+extern const cpumask_t *cpumask_of_node(int node);
+#else
 /* Returns a pointer to the cpumask of CPUs on Node 'node'. */
 static inline const cpumask_t *cpumask_of_node(int node)
 {
         return &node_to_cpumask_map[node];
 }
-
-#endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
+#endif
 
 extern void setup_node_to_cpumask_map(void);
 
-#endif /* CONFIG_X86_64 */
-
 /*
  * Returns the number of the node containing Node 'node'. This
  * architecture is flat, so it is a pretty simple function!
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 7f051c170add..c55639b1ab8a 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -115,11 +115,6 @@ EXPORT_PER_CPU_SYMBOL(cpu_info);
 atomic_t init_deasserted;
 
 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_32)
-
-/* which logical CPUs are on which nodes */
-cpumask_t node_to_cpumask_map[MAX_NUMNODES] __read_mostly =
-                                { [0 ... MAX_NUMNODES-1] = CPU_MASK_NONE };
-EXPORT_SYMBOL(node_to_cpumask_map);
 /* which node each logical CPU is on */
 int cpu_to_node_map[NR_CPUS] __read_mostly = { [0 ... NR_CPUS-1] = 0 };
 EXPORT_SYMBOL(cpu_to_node_map);
diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile
index 08537747cb58..fdd30d08ab52 100644
--- a/arch/x86/mm/Makefile
+++ b/arch/x86/mm/Makefile
@@ -14,7 +14,7 @@ obj-$(CONFIG_MMIOTRACE)		+= mmiotrace.o
 mmiotrace-y                     := kmmio.o pf_in.o mmio-mod.o
 obj-$(CONFIG_MMIOTRACE_TEST)    += testmmiotrace.o
 
-obj-$(CONFIG_NUMA)              += numa_$(BITS).o
+obj-$(CONFIG_NUMA)              += numa.o numa_$(BITS).o
 obj-$(CONFIG_K8_NUMA)           += k8topology_64.o
 obj-$(CONFIG_ACPI_NUMA)         += srat_$(BITS).o
 
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
new file mode 100644
index 000000000000..f3a19e939e80
--- /dev/null
+++ b/arch/x86/mm/numa.c
@@ -0,0 +1,71 @@
+/* Common code for 32 and 64-bit NUMA */
+#include <linux/topology.h>
+#include <linux/module.h>
+#include <linux/bootmem.h>
+
+#ifdef CONFIG_DEBUG_PER_CPU_MAPS
+# define DBG(x...) printk(KERN_DEBUG x)
+#else
+# define DBG(x...)
+#endif
+
+/*
+ * Which logical CPUs are on which nodes
+ */
+cpumask_t *node_to_cpumask_map;
+EXPORT_SYMBOL(node_to_cpumask_map);
+
+/*
+ * Allocate node_to_cpumask_map based on number of available nodes
+ * Requires node_possible_map to be valid.
+ *
+ * Note: node_to_cpumask() is not valid until after this is done.
+ * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
+ */
+void __init setup_node_to_cpumask_map(void)
+{
+        unsigned int node, num = 0;
+        cpumask_t *map;
+
+        /* setup nr_node_ids if not done yet */
+        if (nr_node_ids == MAX_NUMNODES) {
+                for_each_node_mask(node, node_possible_map)
+                        num = node;
+                nr_node_ids = num + 1;
+        }
+
+        /* allocate the map */
+        map = alloc_bootmem_low(nr_node_ids * sizeof(cpumask_t));
+        DBG("node_to_cpumask_map at %p for %d nodes\n", map, nr_node_ids);
+
+        pr_debug("Node to cpumask map at %p for %d nodes\n",
+                 map, nr_node_ids);
+
+        /* node_to_cpumask() will now work */
+        node_to_cpumask_map = map;
+}
+
+#ifdef CONFIG_DEBUG_PER_CPU_MAPS
+/*
+ * Returns a pointer to the bitmask of CPUs on Node 'node'.
+ */
+const cpumask_t *cpumask_of_node(int node)
+{
+        if (node_to_cpumask_map == NULL) {
+                printk(KERN_WARNING
+                        "cpumask_of_node(%d): no node_to_cpumask_map!\n",
+                        node);
+                dump_stack();
+                return cpu_online_mask;
+        }
+        if (node >= nr_node_ids) {
+                printk(KERN_WARNING
+                        "cpumask_of_node(%d): node > nr_node_ids(%d)\n",
+                        node, nr_node_ids);
+                dump_stack();
+                return cpu_none_mask;
+        }
+        return &node_to_cpumask_map[node];
+}
+EXPORT_SYMBOL(cpumask_of_node);
+#endif
diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index 48bf396b6e79..eee149078862 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -20,12 +20,6 @@
 #include <asm/acpi.h>
 #include <asm/k8.h>
 
-#ifdef CONFIG_DEBUG_PER_CPU_MAPS
-# define DBG(x...) printk(KERN_DEBUG x)
-#else
-# define DBG(x...)
-#endif
-
 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
 EXPORT_SYMBOL(node_data);
 
@@ -49,12 +43,6 @@ DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
 
 /*
- * Which logical CPUs are on which nodes
- */
-cpumask_t *node_to_cpumask_map;
-EXPORT_SYMBOL(node_to_cpumask_map);
-
-/*
  * Given a shift value, try to populate memnodemap[]
  * Returns :
  * 1 if OK
@@ -661,36 +649,6 @@ void __init init_cpu_to_node(void)
 #endif
 
 
-/*
- * Allocate node_to_cpumask_map based on number of available nodes
- * Requires node_possible_map to be valid.
- *
- * Note: node_to_cpumask() is not valid until after this is done.
- * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
- */
-void __init setup_node_to_cpumask_map(void)
-{
-        unsigned int node, num = 0;
-        cpumask_t *map;
-
-        /* setup nr_node_ids if not done yet */
-        if (nr_node_ids == MAX_NUMNODES) {
-                for_each_node_mask(node, node_possible_map)
-                        num = node;
-                nr_node_ids = num + 1;
-        }
-
-        /* allocate the map */
-        map = alloc_bootmem_low(nr_node_ids * sizeof(cpumask_t));
-        DBG("node_to_cpumask_map at %p for %d nodes\n", map, nr_node_ids);
-
-        pr_debug("Node to cpumask map at %p for %d nodes\n",
-                 map, nr_node_ids);
-
-        /* node_to_cpumask() will now work */
-        node_to_cpumask_map = map;
-}
-
 void __cpuinit numa_set_node(int cpu, int node)
 {
         int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
@@ -799,33 +757,6 @@ int early_cpu_to_node(int cpu)
         return per_cpu(x86_cpu_to_node_map, cpu);
 }
 
-
-/* empty cpumask */
-static const cpumask_t cpu_mask_none;
-
-/*
- * Returns a pointer to the bitmask of CPUs on Node 'node'.
- */
-const cpumask_t *cpumask_of_node(int node)
-{
-        if (node_to_cpumask_map == NULL) {
-                printk(KERN_WARNING
-                        "cpumask_of_node(%d): no node_to_cpumask_map!\n",
-                        node);
-                dump_stack();
-                return (const cpumask_t *)&cpu_online_map;
-        }
-        if (node >= nr_node_ids) {
-                printk(KERN_WARNING
-                        "cpumask_of_node(%d): node > nr_node_ids(%d)\n",
-                        node, nr_node_ids);
-                dump_stack();
-                return &cpu_mask_none;
-        }
-        return &node_to_cpumask_map[node];
-}
-EXPORT_SYMBOL(cpumask_of_node);
-
 /*
  * --------- end of debug versions of the numa functions ---------
  */