diff --git a/include/linux/sched/smt.h b/include/linux/sched/smt.h
new file mode 100644
index 000000000000..5209c268c6fd
--- /dev/null
+++ b/include/linux/sched/smt.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_SCHED_SMT_H
+#define _LINUX_SCHED_SMT_H
+
+#include <linux/atomic.h>
+
+#ifdef CONFIG_SCHED_SMT
+extern atomic_t sched_smt_present;
+
+static __always_inline bool sched_smt_active(void)
+{
+	return atomic_read(&sched_smt_present);
+}
+#else
+static inline bool sched_smt_active(void) { return false; }
+#endif
+
+#endif
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 5728acda78aa..e94f29b3f7cd 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7546,11 +7546,22 @@ static int cpuset_cpu_inactive(unsigned int cpu)
 	return 0;
 }
 
+#ifdef CONFIG_SCHED_SMT
+atomic_t sched_smt_present = ATOMIC_INIT(0);
+#endif
+
 int sched_cpu_activate(unsigned int cpu)
 {
 	struct rq *rq = cpu_rq(cpu);
 	unsigned long flags;
 
+#ifdef CONFIG_SCHED_SMT
+	/*
+	 * When going up, increment the number of cores with SMT present.
+	 */
+	if (cpumask_weight(cpu_smt_mask(cpu)) == 2)
+		atomic_inc(&sched_smt_present);
+#endif
 	set_cpu_active(cpu, true);
 
 	if (sched_smp_initialized) {
@@ -7599,6 +7610,14 @@ int sched_cpu_deactivate(unsigned int cpu)
 	else
 		synchronize_rcu();
 
+#ifdef CONFIG_SCHED_SMT
+	/*
+	 * When going down, decrement the number of cores with SMT present.
+	 */
+	if (cpumask_weight(cpu_smt_mask(cpu)) == 2)
+		atomic_dec(&sched_smt_present);
+#endif
+
 	if (!sched_smp_initialized)
 		return 0;
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 40bc5aaef223..3b2726656eb5 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2,6 +2,7 @@
 #include <linux/sched.h>
 #include <linux/sched/sysctl.h>
 #include <linux/sched/rt.h>
+#include <linux/sched/smt.h>
 #include <linux/u64_stats_sync.h>
 #include <linux/sched/deadline.h>
 #include <linux/kernel_stat.h>