cpu: change cpu_sys_devices from array to per_cpu variable

Change cpu_sys_devices from array to per_cpu variable in drivers/base/cpu.c.

Signed-off-by: Mike Travis <[e-mail]>
Cc: Ashok Raj <[e-mail]>
Cc: Vivek Goyal <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
Cc: Suresh Siddha <[e-mail]>
Cc: Kay Sievers <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/base/cpu.c

···
 };
 EXPORT_SYMBOL(cpu_sysdev_class);
 
-static struct sys_device *cpu_sys_devices[NR_CPUS];
+static DEFINE_PER_CPU(struct sys_device *, cpu_sys_devices);
 
 #ifdef CONFIG_HOTPLUG_CPU
 static ssize_t show_online(struct sys_device *dev, char *buf)
···
 	sysdev_remove_file(&cpu->sysdev, &attr_online);
 
 	sysdev_unregister(&cpu->sysdev);
-	cpu_sys_devices[logical_cpu] = NULL;
+	per_cpu(cpu_sys_devices, logical_cpu) = NULL;
 	return;
 }
 #else /* ... !CONFIG_HOTPLUG_CPU */
···
 	if (!error && cpu->hotpluggable)
 		register_cpu_control(cpu);
 	if (!error)
-		cpu_sys_devices[num] = &cpu->sysdev;
+		per_cpu(cpu_sys_devices, num) = &cpu->sysdev;
 	if (!error)
 		register_cpu_under_node(num, cpu_to_node(num));
 
···
 
 struct sys_device *get_cpu_sysdev(unsigned cpu)
 {
-	if (cpu < NR_CPUS)
-		return cpu_sys_devices[cpu];
+	if (cpu < nr_cpu_ids && cpu_possible(cpu))
+		return per_cpu(cpu_sys_devices, cpu);
 	else
 		return NULL;
 }