x86: generalize boot_cpu_id

x86/Voyager can boot on non-zero processors. While that can probably
be fixed by properly remapping the physical CPU IDs, keep boot_cpu_id
for now for easier transition - and expand it to all of x86.
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/Kconfig

@@ -238,10 +238,6 @@ config SMP
 
 	  If you don't know what to do here, say N.
 
-config X86_HAS_BOOT_CPU_ID
-	def_bool y
-	depends on X86_VOYAGER
-
 config SPARSE_IRQ
 	bool "Support sparse irq numbering"
 	depends on PCI_MSI || HT_IRQ

arch/x86/include/asm/cpu.h

@@ -32,10 +32,6 @@ extern void arch_unregister_cpu(int);
 
 DECLARE_PER_CPU(int, cpu_state);
 
-#ifdef CONFIG_X86_HAS_BOOT_CPU_ID
-extern unsigned char boot_cpu_id;
-#else
-#define boot_cpu_id				0
-#endif
+extern unsigned int boot_cpu_id;
 
 #endif /* _ASM_X86_CPU_H */

arch/x86/kernel/setup.c

@@ -112,6 +112,20 @@
 #define ARCH_SETUP
 #endif
 
+unsigned int boot_cpu_id __read_mostly;
+
+#ifdef CONFIG_X86_64
+int default_cpu_present_to_apicid(int mps_cpu)
+{
+	return __default_cpu_present_to_apicid(mps_cpu);
+}
+
+int default_check_phys_apicid_present(int boot_cpu_physical_apicid)
+{
+	return __default_check_phys_apicid_present(boot_cpu_physical_apicid);
+}
+#endif
+
 #ifndef CONFIG_DEBUG_BOOT_PARAMS
 struct boot_params __initdata boot_params;
 #else

arch/x86/kernel/smpboot.c

@@ -905,18 +905,6 @@ static int __cpuinit do_boot_cpu(int apicid, int cpu)
 	return boot_error;
 }
 
-#ifdef CONFIG_X86_64
-int default_cpu_present_to_apicid(int mps_cpu)
-{
-	return __default_cpu_present_to_apicid(mps_cpu);
-}
-
-int default_check_phys_apicid_present(int boot_cpu_physical_apicid)
-{
-	return __default_check_phys_apicid_present(boot_cpu_physical_apicid);
-}
-#endif
-
 int __cpuinit native_cpu_up(unsigned int cpu)
 {
 	int apicid = apic->cpu_present_to_apicid(cpu);