1 files changed, 4 insertions, 23 deletions

diff --git a/arch/x86/kernel/tsc_64.c b/arch/x86/kernel/tsc_64.c
index 01fc9f0c39e2..d3bebaaad842 100644
--- a/arch/x86/kernel/tsc_64.c
+++ b/arch/x86/kernel/tsc_64.c
@@ -11,7 +11,6 @@
 #include <asm/hpet.h>
 #include <asm/timex.h>
 #include <asm/timer.h>
-#include <asm/vgtod.h>
 
 static int notsc __initdata = 0;
 
@@ -149,9 +148,7 @@ static int time_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
                         mark_tsc_unstable("cpufreq changes");
         }
 
-        preempt_disable();
-        set_cyc2ns_scale(tsc_khz_ref, smp_processor_id());
-        preempt_enable();
+        set_cyc2ns_scale(tsc_khz_ref, freq->cpu);
 
         return 0;
 }
@@ -291,34 +288,18 @@ int __init notsc_setup(char *s)
 
 __setup("notsc", notsc_setup);
 
-static struct clocksource clocksource_tsc;
 
-/*
- * We compare the TSC to the cycle_last value in the clocksource
- * structure to avoid a nasty time-warp. This can be observed in a
- * very small window right after one CPU updated cycle_last under
- * xtime/vsyscall_gtod lock and the other CPU reads a TSC value which
- * is smaller than the cycle_last reference value due to a TSC which
- * is slighty behind. This delta is nowhere else observable, but in
- * that case it results in a forward time jump in the range of hours
- * due to the unsigned delta calculation of the time keeping core
- * code, which is necessary to support wrapping clocksources like pm
- * timer.
- */
+/* clock source code: */
 static cycle_t read_tsc(void)
 {
         cycle_t ret = (cycle_t)get_cycles();
-
-        return ret >= clocksource_tsc.cycle_last ?
-                ret : clocksource_tsc.cycle_last;
+        return ret;
 }
 
 static cycle_t __vsyscall_fn vread_tsc(void)
 {
         cycle_t ret = (cycle_t)vget_cycles();
-
-        return ret >= __vsyscall_gtod_data.clock.cycle_last ?
-                ret : __vsyscall_gtod_data.clock.cycle_last;
+        return ret;
 }
 
 static struct clocksource clocksource_tsc = {