[POWERPC][XEN] Quiet timebase synchronization at boot.

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>

xen/arch/powerpc/smp-tbsync.c

@@ -32,6 +32,13 @@
 
 #define NUM_ITER		300
 
+#undef DEBUG
+#ifdef DEBUG
+#define DBG(fmt...) printk(fmt)
+#else
+#define DBG(fmt...)
+#endif
+
 enum {
 	kExit=0, kSetAndTest, kTest
 };
@@ -128,7 +135,7 @@ void __devinit smp_generic_give_timebase(void)
 {
 	int i, score, score2, old, min=0, max=5000, offset=1000;
 
-	printk("Synchronizing timebase\n");
+	printk("Synchronizing timebase...\n");
 
 	/* if this fails then this kernel won't work anyway... */
 	tbsync = kmalloc( sizeof(*tbsync), GFP_KERNEL );
@@ -139,13 +146,13 @@ void __devinit smp_generic_give_timebase(void)
 	while (!tbsync->ack)
 		barrier();
 
-	printk("Got ack\n");
+	DBG("Got ack\n");
 
 	/* binary search */
 	for (old = -1; old != offset ; offset = (min+max) / 2) {
 		score = start_contest(kSetAndTest, offset, NUM_ITER);
 
-		printk("score %d, offset %d\n", score, offset );
+		DBG("score %d, offset %d\n", score, offset );
 
 		if( score > 0 )
 			max = offset;
@@ -156,7 +163,7 @@ void __devinit smp_generic_give_timebase(void)
 	score = start_contest(kSetAndTest, min, NUM_ITER);
 	score2 = start_contest(kSetAndTest, max, NUM_ITER);
 
-	printk("Min %d (score %d), Max %d (score %d)\n",
+	DBG("Min %d (score %d), Max %d (score %d)\n",
 	       min, score, max, score2);
 	score = abs(score);
 	score2 = abs(score2);
@@ -171,7 +178,7 @@ void __devinit smp_generic_give_timebase(void)
 		if (score2 <= score || score2 < 20)
 			break;
 	}
-	printk("Final offset: %d (%d/%d)\n", offset, score2, NUM_ITER );
+	DBG("Final offset: %d (%d/%d)\n", offset, score2, NUM_ITER );
 
 	/* exiting */
 	tbsync->cmd = kExit;