fix this warning:
arch/x86/kernel/early-quirks.c:40: warning: nvidia_hpet_check defined but not used
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
 }
 
 #ifdef CONFIG_ACPI
+#ifdef CONFIG_X86_IO_APIC
 
 static int __init nvidia_hpet_check(struct acpi_table_header *header)
 {
        return 0;
 }
-#endif
+#endif /* CONFIG_X86_IO_APIC */
+#endif /* CONFIG_ACPI */
 
 static void __init nvidia_bugs(void)
 {