Address compiling problem that Fengguang report.

Reported-by: Fengguang Wu <w...@linux.intel.com>
Signed-off-by: Yinghai Lu <ying...@kernel.org>
---
 arch/x86/include/asm/mpspec.h |   19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/mpspec.h b/arch/x86/include/asm/mpspec.h
index e70b7e5..13439c5 100644
--- a/arch/x86/include/asm/mpspec.h
+++ b/arch/x86/include/asm/mpspec.h
@@ -95,10 +95,27 @@ static inline void early_reserve_e820_mpc_new(void) { }
 #endif
 
 void __cpuinit generic_processor_info(int apicid, int version);
-#ifdef CONFIG_ACPI
+
+#ifdef CONFIG_X86_IO_APIC
 int __mp_register_ioapic(int id, u32 address, u32 gsi_base, bool hot);
 int mp_unregister_ioapic(u32 gsi_base);
 extern void mp_register_ioapic(int id, u32 address, u32 gsi_base);
+#else
+static inline int __mp_register_ioapic(int id, u32 address, u32 gsi_base,
+                                        bool hot)
+{
+       return 0;
+}
+static inline int mp_unregister_ioapic(u32 gsi_base)
+{
+       return 0;
+}
+static inline void mp_register_ioapic(int id, u32 address, u32 gsi_base)
+{
+}
+#endif
+
+#ifdef CONFIG_ACPI
 extern void mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
                                   u32 gsi);
 extern void mp_config_acpi_legacy_irqs(void);
-- 
1.7.10.4

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