1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index e62a4ccea54d..27fd775375b0 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -35,6 +35,7 @@ static ssize_t __ref store_online(struct sys_device *dev, struct sysdev_attribut
         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
         ssize_t ret;
 
+        cpu_hotplug_driver_lock();
         switch (buf[0]) {
         case '0':
                 ret = cpu_down(cpu->sysdev.id);
@@ -49,6 +50,7 @@ static ssize_t __ref store_online(struct sys_device *dev, struct sysdev_attribut
         default:
                 ret = -EINVAL;
         }
+        cpu_hotplug_driver_unlock();
 
         if (ret >= 0)
                 ret = count;
@@ -72,6 +74,38 @@ void unregister_cpu(struct cpu *cpu)
         per_cpu(cpu_sys_devices, logical_cpu) = NULL;
         return;
 }
+
+#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
+static ssize_t cpu_probe_store(struct class *class, const char *buf,
+                               size_t count)
+{
+        return arch_cpu_probe(buf, count);
+}
+
+static ssize_t cpu_release_store(struct class *class, const char *buf,
+                                 size_t count)
+{
+        return arch_cpu_release(buf, count);
+}
+
+static CLASS_ATTR(probe, S_IWUSR, NULL, cpu_probe_store);
+static CLASS_ATTR(release, S_IWUSR, NULL, cpu_release_store);
+
+int __init cpu_probe_release_init(void)
+{
+        int rc;
+
+        rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
+                               &class_attr_probe.attr);
+        if (!rc)
+                rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
+                                       &class_attr_release.attr);
+
+        return rc;
+}
+device_initcall(cpu_probe_release_init);
+#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
+
 #else /* ... !CONFIG_HOTPLUG_CPU */
 static inline void register_cpu_control(struct cpu *cpu)
 {