--- linux-4.9.37/include/linux/cpuidle.h	2017-07-12 16:42:41.000000000 +0300
+++ linux-4.9.y/include/linux/cpuidle.h	2021-06-07 13:01:34.000000000 +0300
@@ -62,6 +62,7 @@
 };
 
 /* Idle State Flags */
+#define CPUIDLE_FLAG_TIME_VALID	(0x01) /* is residency time measurable? */
 #define CPUIDLE_FLAG_COUPLED	(0x02) /* state applies to multiple cpus */
 #define CPUIDLE_FLAG_TIMER_STOP (0x04)  /* timer is stopped on this state */