[PATCH] x86_64 vsyscall fails to compile when CONFIG_HOTPLUG_CPU is disabled

[Andy Whitcroft <apw@shadowen.org>]

x86_64 vsyscall fails to compile when CONFIG_HOTPLUG_CPU is disabled

The following change attempted to fix up the notifier structure
when CONFIG_HOTPLUG_CPU is disabled:

    [PATCH] x86-64: Fix vgetcpu when CONFIG_HOTPLUG_CPU is disabled

It seems to leave a reference to the cpu_vsyscall_notifier which is
not declared unles CONFIG_HOTPLUG_CPU is defined, leading to the following
compile time error:

  arch/x86_64/kernel/vsyscall.c:310: error: `cpu_vsyscall_notifier'
				  undeclared (first use in this function)

Make the hotcpu_notifier dependant on CONFIG_HOTPLUG_CPU.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
---
diff --git a/arch/x86_64/kernel/vsyscall.c b/arch/x86_64/kernel/vsyscall.c
index 3416462..e93ffcf 100644
--- a/arch/x86_64/kernel/vsyscall.c
+++ b/arch/x86_64/kernel/vsyscall.c
@@ -307,7 +307,9 @@ static int __init vsyscall_init(void)
 	register_sysctl_table(kernel_root_table2, 0);
 #endif
 	on_each_cpu(cpu_vsyscall_init, NULL, 0, 1);
+#ifdef CONFIG_HOTPLUG_CPU
 	hotcpu_notifier(cpu_vsyscall_notifier, 0);
+#endif
 	return 0;
 }
 
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