s390/topology: use cpu_topology array instead of per cpu variable

CPU topology information like cpu to node mapping must be setup in
setup_arch already. Topology information is currently made available
with a per cpu variable; this however will not work when the
initialization will be moved to setup_arch, since the generic percpu
setup will be done much later.

Therefore convert back to a cpu_topology array.

Reviewed-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

3 files changed, 23 insertions, 24 deletions

diff --git a/arch/s390/include/asm/topology.h b/arch/s390/include/asm/topology.h
index f15f5571ca2b..bc6f45421c98 100644
--- a/arch/s390/include/asm/topology.h
+++ b/arch/s390/include/asm/topology.h
@@ -22,18 +22,17 @@ struct cpu_topology_s390 {
 	cpumask_t drawer_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_sibling_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 topology_drawer_id(cpu)		  (per_cpu(cpu_topology, cpu).drawer_id)
-#define topology_drawer_cpumask(cpu)	  (&per_cpu(cpu_topology, cpu).drawer_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_sibling_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)
+#define topology_drawer_id(cpu)		  (cpu_topology[cpu].drawer_id)
+#define topology_drawer_cpumask(cpu)	  (&cpu_topology[cpu].drawer_mask)
 
 #define mc_capable() 1
 
@@ -65,7 +64,7 @@ static inline void topology_expect_change(void) { }
 #define cpu_to_node cpu_to_node
 static inline int cpu_to_node(int cpu)
 {
-	return per_cpu(cpu_topology, cpu).node_id;
+	return cpu_topology[cpu].node_id;
 }
 
 /* Returns a pointer to the cpumask of CPUs on node 'node'. */
diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c
index 8705ee66c087..7169d112c91a 100644
--- a/arch/s390/kernel/topology.c
+++ b/arch/s390/kernel/topology.c
@@ -41,15 +41,15 @@ static bool topology_enabled = true;
 static DECLARE_WORK(topology_work, topology_work_fn);
 
 /*
- * Socket/Book linked lists and per_cpu(cpu_topology) updates are
+ * Socket/Book linked lists and cpu_topology updates are
  * protected by "sched_domains_mutex".
  */
 static struct mask_info socket_info;
 static struct mask_info book_info;
 static struct mask_info drawer_info;
 
-DEFINE_PER_CPU(struct cpu_topology_s390, cpu_topology);
-EXPORT_PER_CPU_SYMBOL_GPL(cpu_topology);
+struct cpu_topology_s390 cpu_topology[NR_CPUS];
+EXPORT_SYMBOL_GPL(cpu_topology);
 
 static cpumask_t cpu_group_map(struct mask_info *info, unsigned int cpu)
 {
@@ -97,7 +97,7 @@ static void add_cpus_to_mask(struct topology_core *tl_core,
 		if (lcpu < 0)
 			continue;
 		for (i = 0; i <= smp_cpu_mtid; i++) {
-			topo = &per_cpu(cpu_topology, lcpu + i);
+			topo = &cpu_topology[lcpu + i];
 			topo->drawer_id = drawer->id;
 			topo->book_id = book->id;
 			topo->socket_id = socket->id;
@@ -220,7 +220,7 @@ static void update_cpu_masks(void)
 	int cpu;
 
 	for_each_possible_cpu(cpu) {
-		topo = &per_cpu(cpu_topology, cpu);
+		topo = &cpu_topology[cpu];
 		topo->thread_mask = cpu_thread_map(cpu);
 		topo->core_mask = cpu_group_map(&socket_info, cpu);
 		topo->book_mask = cpu_group_map(&book_info, cpu);
@@ -394,23 +394,23 @@ int topology_cpu_init(struct cpu *cpu)
 
 static const struct cpumask *cpu_thread_mask(int cpu)
 {
-	return &per_cpu(cpu_topology, cpu).thread_mask;
+	return &cpu_topology[cpu].thread_mask;
 }
 
 
 const struct cpumask *cpu_coregroup_mask(int cpu)
 {
-	return &per_cpu(cpu_topology, cpu).core_mask;
+	return &cpu_topology[cpu].core_mask;
 }
 
 static const struct cpumask *cpu_book_mask(int cpu)
 {
-	return &per_cpu(cpu_topology, cpu).book_mask;
+	return &cpu_topology[cpu].book_mask;
 }
 
 static const struct cpumask *cpu_drawer_mask(int cpu)
 {
-	return &per_cpu(cpu_topology, cpu).drawer_mask;
+	return &cpu_topology[cpu].drawer_mask;
 }
 
 static int __init early_parse_topology(char *p)
diff --git a/arch/s390/numa/mode_emu.c b/arch/s390/numa/mode_emu.c
index b83109328fec..2ed27e8eb4d4 100644
--- a/arch/s390/numa/mode_emu.c
+++ b/arch/s390/numa/mode_emu.c
@@ -355,7 +355,7 @@ static struct toptree *toptree_from_topology(void)
 	phys = toptree_new(TOPTREE_ID_PHYS, 1);
 
 	for_each_online_cpu(cpu) {
-		top = &per_cpu(cpu_topology, cpu);
+		top = &cpu_topology[cpu];
 		node = toptree_get_child(phys, 0);
 		drawer = toptree_get_child(node, top->drawer_id);
 		book = toptree_get_child(drawer, top->book_id);
@@ -378,7 +378,7 @@ static void topology_add_core(struct toptree *core)
 	int cpu;
 
 	for_each_cpu(cpu, &core->mask) {
-		top = &per_cpu(cpu_topology, cpu);
+		top = &cpu_topology[cpu];
 		cpumask_copy(&top->thread_mask, &core->mask);
 		cpumask_copy(&top->core_mask, &core_mc(core)->mask);
 		cpumask_copy(&top->book_mask, &core_book(core)->mask);