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path: root/drivers/base/cpu.c
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Diffstat (limited to 'drivers/base/cpu.c')
-rw-r--r--drivers/base/cpu.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index b79badd0f15..a95844790f7 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -9,12 +9,15 @@
#include <linux/topology.h>
#include <linux/device.h>
+#include "base.h"
struct sysdev_class cpu_sysdev_class = {
set_kset_name("cpu"),
};
EXPORT_SYMBOL(cpu_sysdev_class);
+static struct sys_device *cpu_sys_devices[NR_CPUS];
+
#ifdef CONFIG_HOTPLUG_CPU
int __attribute__((weak)) smp_prepare_cpu (int cpu)
{
@@ -63,6 +66,7 @@ static void __devinit register_cpu_control(struct cpu *cpu)
}
void unregister_cpu(struct cpu *cpu, struct node *root)
{
+ int logical_cpu = cpu->sysdev.id;
if (root)
sysfs_remove_link(&root->sysdev.kobj,
@@ -70,7 +74,7 @@ void unregister_cpu(struct cpu *cpu, struct node *root)
sysdev_remove_file(&cpu->sysdev, &attr_online);
sysdev_unregister(&cpu->sysdev);
-
+ cpu_sys_devices[logical_cpu] = NULL;
return;
}
#else /* ... !CONFIG_HOTPLUG_CPU */
@@ -102,10 +106,19 @@ int __devinit register_cpu(struct cpu *cpu, int num, struct node *root)
kobject_name(&cpu->sysdev.kobj));
if (!error && !cpu->no_control)
register_cpu_control(cpu);
+ if (!error)
+ cpu_sys_devices[num] = &cpu->sysdev;
return error;
}
-
+struct sys_device *get_cpu_sysdev(int cpu)
+{
+ if (cpu < NR_CPUS)
+ return cpu_sys_devices[cpu];
+ else
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(get_cpu_sysdev);
int __init cpu_dev_init(void)
{