Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
---
 arch/x86/kernel/apic_32.c |    7 +++++++
 arch/x86/kernel/apic_64.c |    2 ++
 2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c
index cbac5ff..6fb2b45 100644
--- a/arch/x86/kernel/apic_32.c
+++ b/arch/x86/kernel/apic_32.c
@@ -1600,6 +1600,13 @@ void __cpuinit generic_processor_info(int apicid, int version)
 	cpu_set(cpu, cpu_present_map);
 }
 
+#ifdef CONFIG_X86_64
+int hard_smp_processor_id(void)
+{
+	return read_apic_id();
+}
+#endif
+
 /*
  * Power management
  */
diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index d3ec746..eeb6983 100644
--- a/arch/x86/kernel/apic_64.c
+++ b/arch/x86/kernel/apic_64.c
@@ -1612,10 +1612,12 @@ void __cpuinit generic_processor_info(int apicid, int version)
 	cpu_set(cpu, cpu_present_map);
 }
 
+#ifdef CONFIG_X86_64
 int hard_smp_processor_id(void)
 {
 	return read_apic_id();
 }
+#endif
 
 /*
  * Power management
-- 
1.5.4.5

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