x86: use wait_for_init_deassert in x86_64

wraps the busy loop for wait_for_init_deasserted() in a function,
so smp_callin in x86_64 looks like more i386

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/smpboot_64.c b/arch/x86/kernel/smpboot_64.c
index 9f4935e..4f6d976 100644
--- a/arch/x86/kernel/smpboot_64.c
+++ b/arch/x86/kernel/smpboot_64.c
@@ -100,6 +100,13 @@
 	print_cpu_info(c);
 }
 
+static inline void wait_for_init_deassert(atomic_t *deassert)
+{
+	while (!atomic_read(deassert))
+		cpu_relax();
+	return;
+}
+
 static atomic_t init_deasserted __cpuinitdata;
 
 /*
@@ -117,8 +124,7 @@
 	 * our local APIC.  We have to wait for the IPI or we'll
 	 * lock up on an APIC access.
 	 */
-	while (!atomic_read(&init_deasserted))
-		cpu_relax();
+	wait_for_init_deassert(&init_deasserted);
 
 	/*
 	 * (This works even if the APIC is not enabled.)