s390/topology: convert cpu_topology array to per cpu variable

Convert the per cpu topology cpu masks to a per cpu variable.
At least for machines which do have less possible cpus than NR_CPUS this can
save a bit of memory (z/VM: max 64 vs 512 for performance_defconfig).

This reduces the kernel image size by 100k.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 26 insertions, 26 deletions

diff --git a/arch/s390/include/asm/topology.h b/arch/s390/include/asm/topology.h
index 9454231c9f23..b1453a2ae1ca 100644
--- a/arch/s390/include/asm/topology.h
+++ b/arch/s390/include/asm/topology.h
@@ -18,15 +18,15 @@ struct cpu_topology_s390 {
         cpumask_t book_mask;
 };
 
-extern struct cpu_topology_s390 cpu_topology[NR_CPUS];
-
-#define topology_physical_package_id(cpu)       (cpu_topology[cpu].socket_id)
-#define topology_thread_id(cpu)                 (cpu_topology[cpu].thread_id)
-#define topology_thread_cpumask(cpu)            (&cpu_topology[cpu].thread_mask)
-#define topology_core_id(cpu)                   (cpu_topology[cpu].core_id)
-#define topology_core_cpumask(cpu)              (&cpu_topology[cpu].core_mask)
-#define topology_book_id(cpu)                   (cpu_topology[cpu].book_id)
-#define topology_book_cpumask(cpu)              (&cpu_topology[cpu].book_mask)
+DECLARE_PER_CPU(struct cpu_topology_s390, cpu_topology);
+
+#define topology_physical_package_id(cpu) (per_cpu(cpu_topology, cpu).socket_id)
+#define topology_thread_id(cpu)           (per_cpu(cpu_topology, cpu).thread_id)
+#define topology_thread_cpumask(cpu)      (&per_cpu(cpu_topology, cpu).thread_mask)
+#define topology_core_id(cpu)             (per_cpu(cpu_topology, cpu).core_id)
+#define topology_core_cpumask(cpu)        (&per_cpu(cpu_topology, cpu).core_mask)
+#define topology_book_id(cpu)             (per_cpu(cpu_topology, cpu).book_id)
+#define topology_book_cpumask(cpu)        (&per_cpu(cpu_topology, cpu).book_mask)
 
 #define mc_capable() 1
 
diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c
index d2303f6340ab..14da43b801d9 100644
--- a/arch/s390/kernel/topology.c
+++ b/arch/s390/kernel/topology.c
@@ -42,8 +42,8 @@ static DEFINE_SPINLOCK(topology_lock);
 static struct mask_info socket_info;
 static struct mask_info book_info;
 
-struct cpu_topology_s390 cpu_topology[NR_CPUS];
-EXPORT_SYMBOL_GPL(cpu_topology);
+DEFINE_PER_CPU(struct cpu_topology_s390, cpu_topology);
+EXPORT_PER_CPU_SYMBOL_GPL(cpu_topology);
 
 static cpumask_t cpu_group_map(struct mask_info *info, unsigned int cpu)
 {
@@ -90,15 +90,15 @@ static struct mask_info *add_cpus_to_mask(struct topology_core *tl_core,
                 if (lcpu < 0)
                         continue;
                 for (i = 0; i <= smp_cpu_mtid; i++) {
-                        cpu_topology[lcpu + i].book_id = book->id;
-                        cpu_topology[lcpu + i].core_id = rcore;
-                        cpu_topology[lcpu + i].thread_id = lcpu + i;
+                        per_cpu(cpu_topology, lcpu + i).book_id = book->id;
+                        per_cpu(cpu_topology, lcpu + i).core_id = rcore;
+                        per_cpu(cpu_topology, lcpu + i).thread_id = lcpu + i;
                         cpumask_set_cpu(lcpu + i, &book->mask);
                         cpumask_set_cpu(lcpu + i, &socket->mask);
                         if (one_socket_per_cpu)
-                                cpu_topology[lcpu + i].socket_id = rcore;
+                                per_cpu(cpu_topology, lcpu + i).socket_id = rcore;
                         else
-                                cpu_topology[lcpu + i].socket_id = socket->id;
+                                per_cpu(cpu_topology, lcpu + i).socket_id = socket->id;
                         smp_cpu_set_polarization(lcpu + i, tl_core->pp);
                 }
                 if (one_socket_per_cpu)
@@ -249,14 +249,14 @@ static void update_cpu_masks(void)
 
         spin_lock_irqsave(&topology_lock, flags);
         for_each_possible_cpu(cpu) {
-                cpu_topology[cpu].thread_mask = cpu_thread_map(cpu);
-                cpu_topology[cpu].core_mask = cpu_group_map(&socket_info, cpu);
-                cpu_topology[cpu].book_mask = cpu_group_map(&book_info, cpu);
+                per_cpu(cpu_topology, cpu).thread_mask = cpu_thread_map(cpu);
+                per_cpu(cpu_topology, cpu).core_mask = cpu_group_map(&socket_info, cpu);
+                per_cpu(cpu_topology, cpu).book_mask = cpu_group_map(&book_info, cpu);
                 if (!MACHINE_HAS_TOPOLOGY) {
-                        cpu_topology[cpu].thread_id = cpu;
-                        cpu_topology[cpu].core_id = cpu;
-                        cpu_topology[cpu].socket_id = cpu;
-                        cpu_topology[cpu].book_id = cpu;
+                        per_cpu(cpu_topology, cpu).thread_id = cpu;
+                        per_cpu(cpu_topology, cpu).core_id = cpu;
+                        per_cpu(cpu_topology, cpu).socket_id = cpu;
+                        per_cpu(cpu_topology, cpu).book_id = cpu;
                 }
         }
         spin_unlock_irqrestore(&topology_lock, flags);
@@ -423,18 +423,18 @@ int topology_cpu_init(struct cpu *cpu)
 
 const struct cpumask *cpu_thread_mask(int cpu)
 {
-        return &cpu_topology[cpu].thread_mask;
+        return &per_cpu(cpu_topology, cpu).thread_mask;
 }
 
 
 const struct cpumask *cpu_coregroup_mask(int cpu)
 {
-        return &cpu_topology[cpu].core_mask;
+        return &per_cpu(cpu_topology, cpu).core_mask;
 }
 
 static const struct cpumask *cpu_book_mask(int cpu)
 {
-        return &cpu_topology[cpu].book_mask;
+        return &per_cpu(cpu_topology, cpu).book_mask;
 }
 
 static int __init early_parse_topology(char *p)