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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.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 6ef3069b571..b79badd0f15 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -16,6 +16,11 @@ struct sysdev_class cpu_sysdev_class = {
EXPORT_SYMBOL(cpu_sysdev_class);
#ifdef CONFIG_HOTPLUG_CPU
+int __attribute__((weak)) smp_prepare_cpu (int cpu)
+{
+ return 0;
+}
+
static ssize_t show_online(struct sys_device *dev, char *buf)
{
struct cpu *cpu = container_of(dev, struct cpu, sysdev);
@@ -36,7 +41,11 @@ static ssize_t store_online(struct sys_device *dev, const char *buf,
kobject_hotplug(&dev->kobj, KOBJ_OFFLINE);
break;
case '1':
- ret = cpu_up(cpu->sysdev.id);
+ ret = smp_prepare_cpu(cpu->sysdev.id);
+ if (!ret)
+ ret = cpu_up(cpu->sysdev.id);
+ if (!ret)
+ kobject_hotplug(&dev->kobj, KOBJ_ONLINE);
break;
default:
ret = -EINVAL;