[PATCH] Avoid printing pointless tsc skew msgs

These messages are kinda silly..

CPU#0 had 0 usecs TSC skew, fixed it up.
CPU#1 had 0 usecs TSC skew, fixed it up.

inspired from: http://bugzilla.kernel.org/attachment.cgi?id=7713&action=viewSigned-off-by: NDave Jones <davej@redhat.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

arch/i386/kernel/smpboot.c

@@ -313,7 +313,9 @@ static void __init synchronize_tsc_bp (void)
 			if (tsc_values[i] < avg)
 				realdelta = -realdelta;
 
-			printk(KERN_INFO "CPU#%d had %ld usecs TSC skew, fixed it up.\n", i, realdelta);
+			if (realdelta > 0)
+				printk(KERN_INFO "CPU#%d had %ld usecs TSC "
+					"skew, fixed it up.\n", i, realdelta);
 		}
 
 		sum += delta;