x86: move impress_friends and smp_check to cpus_done

the cpu count is changed accordingly: now, what matters is
online cpus.
Also, we add those functions for x86_64

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index ddb94ef..6978f1b 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -114,7 +114,7 @@
 	 * approved Athlon
 	 */
 	if (tainted & TAINT_UNSAFE_SMP) {
-		if (cpus_weight(cpu_present_map))
+		if (num_online_cpus())
 			printk(KERN_INFO "WARNING: This combination of AMD"
 				"processors is not suitable for SMP.\n");
 		else
@@ -258,7 +258,7 @@
 			bogosum += cpu_data(cpu).loops_per_jiffy;
 	printk(KERN_INFO
 		"Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
-		cpus_weight(cpu_present_map),
+		num_online_cpus(),
 		bogosum/(500000/HZ),
 		(bogosum/(5000/HZ))%100);