Drop.

Signed-Off-By: Daniel Walker <dwalker@mvista.com>

---
 arch/x86_64/kernel/tsc.c |   31 +++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

Index: linux-2.6.19/arch/x86_64/kernel/tsc.c
===================================================================
--- linux-2.6.19.orig/arch/x86_64/kernel/tsc.c
+++ linux-2.6.19/arch/x86_64/kernel/tsc.c
@@ -46,6 +46,13 @@ static inline int check_tsc_unstable(voi
 {
 	return tsc_unstable;
 }
+
+void mark_tsc_unstable(void)
+{
+	tsc_unstable = 1;
+}
+EXPORT_SYMBOL_GPL(mark_tsc_unstable);
+
 #ifdef CONFIG_CPU_FREQ
 
 /* Frequency scaling support. Adjust the TSC based timer when the cpu frequency
@@ -174,6 +181,9 @@ __setup("notsc", notsc_setup);
 
 
 /* clock source code: */
+
+static int tsc_update_callback(void);
+
 static cycle_t read_tsc(void)
 {
 	cycle_t ret = (cycle_t)get_cycles_sync();
@@ -192,23 +202,24 @@ static struct clocksource clocksource_ts
 	.read			= read_tsc,
 	.mask			= CLOCKSOURCE_MASK(64),
 	.shift			= 22,
+	.update_callback	= tsc_update_callback,
 	.flags			= CLOCK_SOURCE_IS_CONTINUOUS |
 				  CLOCK_SOURCE_MUST_VERIFY,
 	.vread			= vread_tsc,
 };
 
-void mark_tsc_unstable(void)
+static int tsc_update_callback(void)
 {
-	if (!tsc_unstable) {
-		tsc_unstable = 1;
-		/* Change only the rating, when not registered */
-		if (clocksource_tsc.mult)
-			clocksource_change_rating(&clocksource_tsc, 0);
-		else
-			clocksource_tsc.rating = 0;
+	int change = 0;
+
+	/* check to see if we should switch to the safe clocksource: */
+	if (clocksource_tsc.rating != 50 && check_tsc_unstable()) {
+		clocksource_tsc.rating = 50;
+		clocksource_reselect();
+		change = 1;
 	}
+	return change;
 }
-EXPORT_SYMBOL_GPL(mark_tsc_unstable);
 
 static int __init init_tsc_clocksource(void)
 {
@@ -216,7 +227,7 @@ static int __init init_tsc_clocksource(v
 		clocksource_tsc.mult = clocksource_khz2mult(cpu_khz,
 							clocksource_tsc.shift);
 		if (check_tsc_unstable())
-			clocksource_tsc.rating = 0;
+			clocksource_tsc.rating = 50;
 
 		return clocksource_register(&clocksource_tsc);
 	}

-- 
-
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