1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 74173ce6aaf4..8a74bf3efd8e 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -369,6 +369,11 @@ static void acpi_processor_idle(void)
                 t2 = inl(acpi_fadt.xpm_tmr_blk.address);
                 /* Get end time (ticks) */
                 t2 = inl(acpi_fadt.xpm_tmr_blk.address);
+
+#ifdef CONFIG_GENERIC_TIME
+                /* TSC halts in C2, so notify users */
+                mark_tsc_unstable();
+#endif
                 /* Re-enable interrupts */
                 local_irq_enable();
                 current_thread_info()->status |= TS_POLLING;
@@ -409,6 +414,10 @@ static void acpi_processor_idle(void)
                                           ACPI_MTX_DO_NOT_LOCK);
                 }
 
+#ifdef CONFIG_GENERIC_TIME
+                /* TSC halts in C3, so notify users */
+                mark_tsc_unstable();
+#endif
                 /* Re-enable interrupts */
                 local_irq_enable();
                 current_thread_info()->status |= TS_POLLING;