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-rw-r--r--arch/x86_64/kernel/time.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c
index 3cc6886f1fb..8cb2b2d35f5 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;