X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=arch%2Fx86%2Fkernel%2Ftsc_sync.c;h=9ffb01c31c40a8c9083e9949d065a442a62f46b7;hb=358c323c17ac527b82c6333db6a485112c21ab0d;hp=355f5f506c8133d2a97108ae211f52839199510b;hpb=ecaedfa385a6df297e17d6e9f296cc63f12c053f;p=linux-2.6

diff --git a/arch/x86/kernel/tsc_sync.c b/arch/x86/kernel/tsc_sync.c
index 355f5f506c..9ffb01c31c 100644
--- a/arch/x86/kernel/tsc_sync.c
+++ b/arch/x86/kernel/tsc_sync.c
@@ -1,5 +1,5 @@
 /*
- * arch/x86_64/kernel/tsc_sync.c: check TSC synchronization.
+ * check TSC synchronization.
  *
  * Copyright (C) 2006, Red Hat, Inc., Ingo Molnar
  *
@@ -46,7 +46,7 @@ static __cpuinit void check_tsc_warp(void)
 	cycles_t start, now, prev, end;
 	int i;
 
-	start = get_cycles_sync();
+	start = get_cycles();
 	/*
 	 * The measurement runs for 20 msecs:
 	 */
@@ -61,18 +61,18 @@ static __cpuinit void check_tsc_warp(void)
 		 */
 		__raw_spin_lock(&sync_lock);
 		prev = last_tsc;
-		now = get_cycles_sync();
+		now = get_cycles();
 		last_tsc = now;
 		__raw_spin_unlock(&sync_lock);
 
 		/*
 		 * Be nice every now and then (and also check whether
-		 * measurement is done [we also insert a 100 million
+		 * measurement is done [we also insert a 10 million
 		 * loops safety exit, so we dont lock up in case the
 		 * TSC readout is totally broken]):
 		 */
 		if (unlikely(!(i & 7))) {
-			if (now > end || i > 100000000)
+			if (now > end || i > 10000000)
 				break;
 			cpu_relax();
 			touch_nmi_watchdog();
@@ -87,8 +87,10 @@ static __cpuinit void check_tsc_warp(void)
 			nr_warps++;
 			__raw_spin_unlock(&sync_lock);
 		}
-
 	}
+	WARN(!(now-start),
+		"Warning: zero tsc calibration delta: %Ld [max: %Ld]\n",
+			now-start, end-start);
 }
 
 /*
@@ -129,23 +131,23 @@ void __cpuinit check_tsc_sync_source(int cpu)
 	while (atomic_read(&stop_count) != cpus-1)
 		cpu_relax();
 
-	/*
-	 * Reset it - just in case we boot another CPU later:
-	 */
-	atomic_set(&start_count, 0);
-
 	if (nr_warps) {
 		printk("\n");
 		printk(KERN_WARNING "Measured %Ld cycles TSC warp between CPUs,"
 				    " turning off TSC clock.\n", max_warp);
 		mark_tsc_unstable("check_tsc_sync_source failed");
-		nr_warps = 0;
-		max_warp = 0;
-		last_tsc = 0;
 	} else {
 		printk(" passed.\n");
 	}
 
+	/*
+	 * Reset it - just in case we boot another CPU later:
+	 */
+	atomic_set(&start_count, 0);
+	nr_warps = 0;
+	max_warp = 0;
+	last_tsc = 0;
+
 	/*
 	 * Let the target continue with the bootup:
 	 */