x86: move hotplug related extern definitions to smp.h

definitions that are inside CONFIG_HOTPLUG_CPU in
the arch-specific smp*.h files are moved to common
header

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/asm-x86/smp.h

@@ -80,6 +80,12 @@ extern void prefill_possible_map(void);
 # include "smp_64.h"
 #endif
 
+#ifdef CONFIG_HOTPLUG_CPU
+extern void cpu_exit_clear(void);
+extern void cpu_uninit(void);
+extern void remove_siblinginfo(int cpu);
+#endif
+
 extern void smp_alloc_memory(void);
 extern void lock_ipi_call_lock(void);
 extern void unlock_ipi_call_lock(void);

include/asm-x86/smp_32.h

@@ -29,12 +29,6 @@ DECLARE_PER_CPU(cpumask_t, cpu_core_map);
 DECLARE_PER_CPU(u16, cpu_llc_id);
 DECLARE_PER_CPU(u16, x86_cpu_to_apicid);
 
-#ifdef CONFIG_HOTPLUG_CPU
-extern void cpu_exit_clear(void);
-extern void cpu_uninit(void);
-extern void remove_siblinginfo(int cpu);
-#endif
-
 #ifdef CONFIG_SMP
 #ifndef CONFIG_PARAVIRT
 #define startup_ipi_hook(phys_apicid, start_eip, start_esp) do { } while (0)