diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index 943ec4d1bd8eae4d06afbc7ca56b5bef50bf6c68..d198f7d82e5a429710a98ed1e3e409534e1ecf60 100644
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -839,14 +839,15 @@ static void setup_APIC_timer(unsigned int clocks)
 
 static int __init calibrate_APIC_clock(void)
 {
-	int apic, apic_start, tsc, tsc_start;
+	unsigned apic, apic_start;
+	unsigned long tsc, tsc_start;
 	int result;
 	/*
 	 * Put whatever arbitrary (but long enough) timeout
 	 * value into the APIC clock, we just want to get the
 	 * counter running for calibration.
 	 */
-	__setup_APIC_LVTT(1000000000);
+	__setup_APIC_LVTT(4000000000);
 
 	apic_start = apic_read(APIC_TMCCT);
 #ifdef CONFIG_X86_PM_TIMER
@@ -857,13 +858,13 @@ static int __init calibrate_APIC_clock(void)
 	} else
 #endif
 	{
-		rdtscl(tsc_start);
+		rdtscll(tsc_start);
 
 		do {
 			apic = apic_read(APIC_TMCCT);
-			rdtscl(tsc);
+			rdtscll(tsc);
 		} while ((tsc - tsc_start) < TICK_COUNT &&
-				(apic - apic_start) < TICK_COUNT);
+				(apic_start - apic) < TICK_COUNT);
 
 		result = (apic_start - apic) * 1000L * tsc_khz /
 					(tsc - tsc_start);