diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h
index f958e7e49c05..4c16888ffa3f 100644
--- a/arch/x86/include/asm/cpu.h
+++ b/arch/x86/include/asm/cpu.h
@@ -15,6 +15,7 @@ extern void prefill_possible_map(void);
 
 static inline void prefill_possible_map(void) {}
 
+#define safe_smp_processor_id()			0
 #define stack_smp_processor_id()		0
 
 #endif /* CONFIG_SMP */
diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index ed4af9a89cfd..c92b93594ab3 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -172,7 +172,6 @@ extern int safe_smp_processor_id(void);
 
 #else /* !CONFIG_X86_32_SMP && !CONFIG_X86_64_SMP */
 #define cpu_physical_id(cpu)		boot_cpu_physical_apicid
-#define safe_smp_processor_id()		0
 #endif
 
 #ifdef CONFIG_X86_LOCAL_APIC
diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index c689d19e35ab..11b93cabdf78 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -24,7 +24,7 @@
 #include <asm/apic.h>
 #include <asm/hpet.h>
 #include <linux/kdebug.h>
-#include <asm/smp.h>
+#include <asm/cpu.h>
 #include <asm/reboot.h>
 #include <asm/virtext.h>
 
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 2b46eb41643b..f8536fee5c12 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -14,6 +14,7 @@
 #include <asm/reboot.h>
 #include <asm/pci_x86.h>
 #include <asm/virtext.h>
+#include <asm/cpu.h>
 
 #ifdef CONFIG_X86_32
 # include <linux/dmi.h>
diff --git a/arch/x86/mach-voyager/setup.c b/arch/x86/mach-voyager/setup.c
index a580b9562e76..0ade62555ff3 100644
--- a/arch/x86/mach-voyager/setup.c
+++ b/arch/x86/mach-voyager/setup.c
@@ -9,6 +9,7 @@
 #include <asm/e820.h>
 #include <asm/io.h>
 #include <asm/setup.h>
+#include <asm/cpu.h>
 
 void __init pre_intr_init_hook(void)
 {