diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
index 3236e84..a21f254 100644
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.c
@@ -73,12 +73,6 @@
 
 u8 apicid_2_node[MAX_APICID];
 
-/*
- * Trampoline 80x86 program as an array.
- */
-
-extern const unsigned char trampoline_data [];
-extern const unsigned char trampoline_end  [];
 static unsigned char *trampoline_base;
 
 static void map_cpu_to_logical_apicid(void);
diff --git a/arch/x86/kernel/smpboot_64.c b/arch/x86/kernel/smpboot_64.c
index 0c67e5a..2cc1b8b 100644
--- a/arch/x86/kernel/smpboot_64.c
+++ b/arch/x86/kernel/smpboot_64.c
@@ -63,13 +63,6 @@
 /* Set when the idlers are all forked */
 int smp_threads_ready;
 
-/*
- * Trampoline 80x86 program as an array.
- */
-
-extern const unsigned char trampoline_data[];
-extern const unsigned char trampoline_end[];
-
 /* State of each CPU */
 DEFINE_PER_CPU(int, cpu_state) = { 0 };
 
diff --git a/include/asm-x86/smp.h b/include/asm-x86/smp.h
index 27d9f65..b2a1697 100644
--- a/include/asm-x86/smp.h
+++ b/include/asm-x86/smp.h
@@ -9,6 +9,12 @@
 extern int smp_num_siblings;
 extern unsigned int num_processors;
 
+/*
+ * Trampoline 80x86 program as an array.
+ */
+extern const unsigned char trampoline_data [];
+extern const unsigned char trampoline_end  [];
+
 struct smp_ops {
 	void (*smp_prepare_boot_cpu)(void);
 	void (*smp_prepare_cpus)(unsigned max_cpus);