x86: move declaring x2apic_extra_bits

it is for uv only
Signed-off-by: NYinghai Lu <yhlu.kernel@gmail.com>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/genx2apic_phys.c

@@ -10,8 +10,6 @@
 #include <asm/ipi.h>
 #include <asm/genapic.h>
 
-DEFINE_PER_CPU(int, x2apic_extra_bits);
-
 static int x2apic_phys;
 
 static int set_x2apic_phys_mode(char *arg)

arch/x86/kernel/genx2apic_uv_x.c

@@ -26,6 +26,8 @@
 #include <asm/uv/uv_hub.h>
 #include <asm/uv/bios.h>
 
+DEFINE_PER_CPU(int, x2apic_extra_bits);
+
 static enum uv_system_type uv_system_type;
 
 static int __init uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)