1 files changed, 11 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c
index 3cc6886f1fb7..8cb2b2d35f5d 100644
--- a/arch/x86_64/kernel/time.c
+++ b/arch/x86_64/kernel/time.c
@@ -944,12 +944,23 @@ void __init time_init(void)
 #endif
 }
 
+static int tsc_unstable = 0;
+
+void mark_tsc_unstable(void)
+{
+        tsc_unstable = 1;
+}
+EXPORT_SYMBOL_GPL(mark_tsc_unstable);
+
 /*
  * Make an educated guess if the TSC is trustworthy and synchronized
  * over all CPUs.
  */
 __cpuinit int unsynchronized_tsc(void)
 {
+        if (tsc_unstable)
+                return 1;
+
 #ifdef CONFIG_SMP
         if (apic_is_clustered_box())
                 return 1;