diff --git a/include/linux/sched.h b/include/linux/sched.h
index ad3ec9ec61f7b6de743b5d6de4225defcc18be99..94a48bb582976554b91c780413d1cd9f40d6ae5f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2515,6 +2515,10 @@ extern u64 sched_clock_cpu(int cpu);
 extern void sched_clock_init(void);
 
 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
+static inline void sched_clock_init_late(void)
+{
+}
+
 static inline void sched_clock_tick(void)
 {
 }
@@ -2537,6 +2541,7 @@ static inline u64 local_clock(void)
 	return sched_clock();
 }
 #else
+extern void sched_clock_init_late(void);
 /*
  * Architectures can set this to 1 if they have specified
  * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
diff --git a/init/main.c b/init/main.c
index b0c9d6facef9a5aced55d1443b40029a660011e8..19228149386cff3c6c0b237a85dd6d74e1823aea 100644
--- a/init/main.c
+++ b/init/main.c
@@ -625,7 +625,6 @@ asmlinkage __visible void __init start_kernel(void)
 	numa_policy_init();
 	if (late_time_init)
 		late_time_init();
-	sched_clock_init();
 	calibrate_delay();
 	pidmap_init();
 	anon_vma_init();
diff --git a/kernel/sched/clock.c b/kernel/sched/clock.c
index 5d6dd38b449cd4742709cb86ef82f03f0ecd5b8b..b3466d4e0cc2d63ea607014610db6750057ace09 100644
--- a/kernel/sched/clock.c
+++ b/kernel/sched/clock.c
@@ -77,6 +77,11 @@ EXPORT_SYMBOL_GPL(sched_clock);
 
 __read_mostly int sched_clock_running;
 
+void sched_clock_init(void)
+{
+	sched_clock_running = 1;
+}
+
 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
 static DEFINE_STATIC_KEY_FALSE(__sched_clock_stable);
 static int __sched_clock_stable_early;
@@ -96,12 +101,18 @@ void set_sched_clock_stable(void)
 {
 	__sched_clock_stable_early = 1;
 
-	smp_mb(); /* matches sched_clock_init() */
-
-	if (!sched_clock_running)
-		return;
+	smp_mb(); /* matches sched_clock_init_late() */
 
-	__set_sched_clock_stable();
+	/*
+	 * This really should only be called early (before
+	 * sched_clock_init_late()) when guestimating our sched_clock() is
+	 * solid.
+	 *
+	 * After that we test stability and we can negate our guess using
+	 * clear_sched_clock_stable, possibly from a watchdog.
+	 */
+	if (WARN_ON_ONCE(sched_clock_running == 2))
+		__set_sched_clock_stable();
 }
 
 static void __clear_sched_clock_stable(struct work_struct *work)
@@ -117,12 +128,10 @@ void clear_sched_clock_stable(void)
 {
 	__sched_clock_stable_early = 0;
 
-	smp_mb(); /* matches sched_clock_init() */
-
-	if (!sched_clock_running)
-		return;
+	smp_mb(); /* matches sched_clock_init_late() */
 
-	schedule_work(&sched_clock_work);
+	if (sched_clock_running == 2)
+		schedule_work(&sched_clock_work);
 }
 
 struct sched_clock_data {
@@ -143,20 +152,9 @@ static inline struct sched_clock_data *cpu_sdc(int cpu)
 	return &per_cpu(sched_clock_data, cpu);
 }
 
-void sched_clock_init(void)
+void sched_clock_init_late(void)
 {
-	u64 ktime_now = ktime_to_ns(ktime_get());
-	int cpu;
-
-	for_each_possible_cpu(cpu) {
-		struct sched_clock_data *scd = cpu_sdc(cpu);
-
-		scd->tick_raw = 0;
-		scd->tick_gtod = ktime_now;
-		scd->clock = ktime_now;
-	}
-
-	sched_clock_running = 1;
+	sched_clock_running = 2;
 
 	/*
 	 * Ensure that it is impossible to not do a static_key update.
@@ -362,11 +360,6 @@ EXPORT_SYMBOL_GPL(sched_clock_idle_wakeup_event);
 
 #else /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
 
-void sched_clock_init(void)
-{
-	sched_clock_running = 1;
-}
-
 u64 sched_clock_cpu(int cpu)
 {
 	if (unlikely(!sched_clock_running))
@@ -374,6 +367,7 @@ u64 sched_clock_cpu(int cpu)
 
 	return sched_clock();
 }
+
 #endif /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
 
 /*
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index a129b34b8206d4dffc4631b23eaa718147c41939..96a4267e6020df98ea88de8dfbfdd62f85de49cf 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7498,6 +7498,7 @@ void __init sched_init_smp(void)
 	init_sched_dl_class();
 
 	sched_init_smt();
+	sched_clock_init_late();
 
 	sched_smp_initialized = true;
 }
@@ -7513,6 +7514,7 @@ early_initcall(migration_init);
 void __init sched_init_smp(void)
 {
 	sched_init_granularity();
+	sched_clock_init_late();
 }
 #endif /* CONFIG_SMP */
 
@@ -7556,6 +7558,8 @@ void __init sched_init(void)
 	int i, j;
 	unsigned long alloc_size = 0, ptr;
 
+	sched_clock_init();
+
 	for (i = 0; i < WAIT_TABLE_SIZE; i++)
 		init_waitqueue_head(bit_wait_table + i);