x86: move disabled_cpus to common header

disabled_cpus is (up to now) a x86_64-only contruction.
But it's extern declaration can be moved to common header anyway
Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/asm-x86/smp.h

@@ -2,6 +2,7 @@
 #define _ASM_X86_SMP_H_
 #ifndef __ASSEMBLY__
 #include <linux/cpumask.h>
+#include <linux/init.h>
 
 extern cpumask_t cpu_callout_map;
 
@@ -60,6 +61,8 @@ void native_smp_prepare_boot_cpu(void);
 void native_smp_prepare_cpus(unsigned int max_cpus);
 void native_smp_cpus_done(unsigned int max_cpus);
 int native_cpu_up(unsigned int cpunum);
+
+extern unsigned disabled_cpus;
 #endif
 
 #ifdef CONFIG_X86_32

include/asm-x86/smp_64.h

@@ -44,7 +44,6 @@ static inline int cpu_present_to_apicid(int mps_cpu)
 extern int __cpu_disable(void);
 extern void __cpu_die(unsigned int cpu);
 extern void prefill_possible_map(void);
-extern unsigned __cpuinitdata disabled_cpus;
 
 #define raw_smp_processor_id()	read_pda(cpunumber)
 #define cpu_physical_id(cpu)	per_cpu(x86_cpu_to_apicid, cpu)