x86: change boot_cpu_id to boot_cpu_physical_apicid

This is to match i386. The former name was cuter,
but the current is more meaningful and more general,
since cpu_id can be a logical id.

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/asm-x86/smp.h b/include/asm-x86/smp.h
index 78ef16d..2ad2f4f 100644
--- a/include/asm-x86/smp.h
+++ b/include/asm-x86/smp.h
@@ -109,6 +109,9 @@
 extern unsigned long setup_trampoline(void);
 
 void smp_store_cpu_info(int id);
+#define cpu_physical_id(cpu)	per_cpu(x86_cpu_to_apicid, cpu)
+#else
+#define cpu_physical_id(cpu)		boot_cpu_physical_apicid
 #endif
 
 #ifdef CONFIG_X86_32