[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>

diff --git a/arch/i386/kernel/msr.c b/arch/i386/kernel/msr.c
index d022cb8..5c29a9f 100644 (file)
--- 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);