ACPI: change processors from array to per_cpu variable

Change processors from an array sized by NR_CPUS to a per_cpu variable.

Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>

5 files changed, 30 insertions, 32 deletions

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index feddc8ed870a..9a803f85ccfe 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -118,7 +118,7 @@ static const struct file_operations acpi_processor_info_fops = {
         .release = single_release,
 };
 
-struct acpi_processor *processors[NR_CPUS];
+DEFINE_PER_CPU(struct acpi_processor *, processors);
 struct acpi_processor_errata errata __read_mostly;
 
 /* --------------------------------------------------------------------------
@@ -614,7 +614,7 @@ static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
         return 0;
 }
 
-static void *processor_device_array[NR_CPUS];
+static DEFINE_PER_CPU(void *, processor_device_array);
 
 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 {
@@ -638,15 +638,15 @@ static int __cpuinit acpi_processor_start(struct acpi_device *device)
          * ACPI id of processors can be reported wrongly by the BIOS.
          * Don't trust it blindly
          */
-        if (processor_device_array[pr->id] != NULL &&
-            processor_device_array[pr->id] != device) {
+        if (per_cpu(processor_device_array, pr->id) != NULL &&
+            per_cpu(processor_device_array, pr->id) != device) {
                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
                         "for the processor\n");
                 return -ENODEV;
         }
-        processor_device_array[pr->id] = device;
+        per_cpu(processor_device_array, pr->id) = device;
 
-        processors[pr->id] = pr;
+        per_cpu(processors, pr->id) = pr;
 
         result = acpi_processor_add_fs(device);
         if (result)
@@ -753,7 +753,7 @@ static int acpi_cpu_soft_notify(struct notifier_block *nfb,
                 unsigned long action, void *hcpu)
 {
         unsigned int cpu = (unsigned long)hcpu;
-        struct acpi_processor *pr = processors[cpu];
+        struct acpi_processor *pr = per_cpu(processors, cpu);
 
         if (action == CPU_ONLINE && pr) {
                 acpi_processor_ppc_has_changed(pr);
@@ -825,8 +825,8 @@ static int acpi_processor_remove(struct acpi_device *device, int type)
                 pr->cdev = NULL;
         }
 
-        processors[pr->id] = NULL;
-        processor_device_array[pr->id] = NULL;
+        per_cpu(processors, pr->id) = NULL;
+        per_cpu(processor_device_array, pr->id) = NULL;
         kfree(pr);
 
         return 0;
@@ -1074,8 +1074,6 @@ static int __init acpi_processor_init(void)
 {
         int result = 0;
 
-
-        memset(&processors, 0, sizeof(processors));
         memset(&errata, 0, sizeof(errata));
 
 #ifdef CONFIG_SMP
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 4976e5db2b3f..0fc310e7dfd6 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -401,7 +401,7 @@ static void acpi_processor_idle(void)
          */
         local_irq_disable();
 
-        pr = processors[smp_processor_id()];
+        pr = __get_cpu_var(processors);
         if (!pr) {
                 local_irq_enable();
                 return;
@@ -1431,7 +1431,7 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev,
         struct acpi_processor *pr;
         struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
 
-        pr = processors[smp_processor_id()];
+        pr = __get_cpu_var(processors);
 
         if (unlikely(!pr))
                 return 0;
@@ -1471,7 +1471,7 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
         u32 t1, t2;
         int sleep_ticks = 0;
 
-        pr = processors[smp_processor_id()];
+        pr = __get_cpu_var(processors);
 
         if (unlikely(!pr))
                 return 0;
@@ -1549,7 +1549,7 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
         u32 t1, t2;
         int sleep_ticks = 0;
 
-        pr = processors[smp_processor_id()];
+        pr = __get_cpu_var(processors);
 
         if (unlikely(!pr))
                 return 0;
diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index d80b2d1441af..b4749969c6b4 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -89,7 +89,7 @@ static int acpi_processor_ppc_notifier(struct notifier_block *nb,
         if (event != CPUFREQ_INCOMPATIBLE)
                 goto out;
 
-        pr = processors[policy->cpu];
+        pr = per_cpu(processors, policy->cpu);
         if (!pr || !pr->performance)
                 goto out;
 
@@ -572,7 +572,7 @@ int acpi_processor_preregister_performance(
 
         /* Call _PSD for all CPUs */
         for_each_possible_cpu(i) {
-                pr = processors[i];
+                pr = per_cpu(processors, i);
                 if (!pr) {
                         /* Look only at processors in ACPI namespace */
                         continue;
@@ -603,7 +603,7 @@ int acpi_processor_preregister_performance(
          * domain info.
          */
         for_each_possible_cpu(i) {
-                pr = processors[i];
+                pr = per_cpu(processors, i);
                 if (!pr)
                         continue;
 
@@ -624,7 +624,7 @@ int acpi_processor_preregister_performance(
 
         cpus_clear(covered_cpus);
         for_each_possible_cpu(i) {
-                pr = processors[i];
+                pr = per_cpu(processors, i);
                 if (!pr)
                         continue;
 
@@ -651,7 +651,7 @@ int acpi_processor_preregister_performance(
                         if (i == j)
                                 continue;
 
-                        match_pr = processors[j];
+                        match_pr = per_cpu(processors, j);
                         if (!match_pr)
                                 continue;
 
@@ -680,7 +680,7 @@ int acpi_processor_preregister_performance(
                         if (i == j)
                                 continue;
 
-                        match_pr = processors[j];
+                        match_pr = per_cpu(processors, j);
                         if (!match_pr)
                                 continue;
 
@@ -697,7 +697,7 @@ int acpi_processor_preregister_performance(
 
 err_ret:
         for_each_possible_cpu(i) {
-                pr = processors[i];
+                pr = per_cpu(processors, i);
                 if (!pr || !pr->performance)
                         continue;
 
@@ -728,7 +728,7 @@ acpi_processor_register_performance(struct acpi_processor_performance
 
         mutex_lock(&performance_mutex);
 
-        pr = processors[cpu];
+        pr = per_cpu(processors, cpu);
         if (!pr) {
                 mutex_unlock(&performance_mutex);
                 return -ENODEV;
@@ -766,7 +766,7 @@ acpi_processor_unregister_performance(struct acpi_processor_performance
 
         mutex_lock(&performance_mutex);
 
-        pr = processors[cpu];
+        pr = per_cpu(processors, cpu);
         if (!pr) {
                 mutex_unlock(&performance_mutex);
                 return;
diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index bb06738860c4..8728782aad3b 100644
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -71,7 +71,7 @@ static int acpi_processor_update_tsd_coord(void)
          * coordination between all CPUs.
          */
         for_each_possible_cpu(i) {
-                pr = processors[i];
+                pr = per_cpu(processors, i);
                 if (!pr)
                         continue;
 
@@ -93,7 +93,7 @@ static int acpi_processor_update_tsd_coord(void)
 
         cpus_clear(covered_cpus);
         for_each_possible_cpu(i) {
-                pr = processors[i];
+                pr = per_cpu(processors, i);
                 if (!pr)
                         continue;
 
@@ -119,7 +119,7 @@ static int acpi_processor_update_tsd_coord(void)
                         if (i == j)
                                 continue;
 
-                        match_pr = processors[j];
+                        match_pr = per_cpu(processors, j);
                         if (!match_pr)
                                 continue;
 
@@ -152,7 +152,7 @@ static int acpi_processor_update_tsd_coord(void)
                         if (i == j)
                                 continue;
 
-                        match_pr = processors[j];
+                        match_pr = per_cpu(processors, j);
                         if (!match_pr)
                                 continue;
 
@@ -172,7 +172,7 @@ static int acpi_processor_update_tsd_coord(void)
 
 err_ret:
         for_each_possible_cpu(i) {
-                pr = processors[i];
+                pr = per_cpu(processors, i);
                 if (!pr)
                         continue;
 
@@ -214,7 +214,7 @@ static int acpi_processor_throttling_notifier(unsigned long event, void *data)
         struct acpi_processor_throttling *p_throttling;
 
         cpu = p_tstate->cpu;
-        pr = processors[cpu];
+        pr = per_cpu(processors, cpu);
         if (!pr) {
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid pr pointer\n"));
                 return 0;
@@ -1035,7 +1035,7 @@ int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
                  * cpus.
                  */
                 for_each_cpu_mask(i, online_throttling_cpus) {
-                        match_pr = processors[i];
+                        match_pr = per_cpu(processors, i);
                         /*
                          * If the pointer is invalid, we will report the
                          * error message and continue.
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 06ebb6ef72aa..3795590e152a 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -255,7 +255,7 @@ extern void acpi_processor_unregister_performance(struct
 int acpi_processor_notify_smm(struct module *calling_module);
 
 /* for communication between multiple parts of the processor kernel module */
-extern struct acpi_processor *processors[NR_CPUS];
+DECLARE_PER_CPU(struct acpi_processor *, processors);
 extern struct acpi_processor_errata errata;
 
 void arch_acpi_processor_init_pdc(struct acpi_processor *pr);