[PATCH] msr.c: use register_hotcpu_notifier()

register_cpu_notifier() cannot do anything in a module, in a
!CONFIG_HOTPLUG_CPU kernel.

Cc: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 6 insertions, 3 deletions

diff --git a/arch/i386/kernel/msr.c b/arch/i386/kernel/msr.c
index d022cb8fd725..5c29a9fb4a44 100644
--- a/arch/i386/kernel/msr.c
+++ b/arch/i386/kernel/msr.c
@@ -251,7 +251,9 @@ static int msr_class_device_create(int i)
         return err;
 }
 
-static int msr_class_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
+#ifdef CONFIG_HOTPLUG_CPU
+static int msr_class_cpu_callback(struct notifier_block *nfb,
+                                unsigned long action, void *hcpu)
 {
         unsigned int cpu = (unsigned long)hcpu;
 
@@ -270,6 +272,7 @@ static struct notifier_block __cpuinitdata msr_class_cpu_notifier =
 {
         .notifier_call = msr_class_cpu_callback,
 };
+#endif
 
 static int __init msr_init(void)
 {
@@ -292,7 +295,7 @@ static int __init msr_init(void)
                 if (err != 0)
                         goto out_class;
         }
-        register_cpu_notifier(&msr_class_cpu_notifier);
+        register_hotcpu_notifier(&msr_class_cpu_notifier);
 
         err = 0;
         goto out;
@@ -315,7 +318,7 @@ static void __exit msr_exit(void)
                 class_device_destroy(msr_class, MKDEV(MSR_MAJOR, cpu));
         class_destroy(msr_class);
         unregister_chrdev(MSR_MAJOR, "cpu/msr");
-        unregister_cpu_notifier(&msr_class_cpu_notifier);
+        unregister_hotcpu_notifier(&msr_class_cpu_notifier);
 }
 
 module_init(msr_init);