--- b/include/linux/cpu.h
+++ a/include/linux/cpu.h
@@ -266,10 +266,8 @@
 
 #if defined(CONFIG_SMP) && defined(CONFIG_HOTPLUG_SMT)
 extern enum cpuhp_smt_control cpu_smt_control;
-extern void cpu_smt_disable(bool force);
 #else
 # define cpu_smt_control		(CPU_SMT_ENABLED)
-static inline void cpu_smt_disable(bool force) { }
 #endif
 
 #endif /* _LINUX_CPU_H_ */
--- b/kernel/cpu.c
+++ a/kernel/cpu.c
@@ -360,23 +360,13 @@
 enum cpuhp_smt_control cpu_smt_control __read_mostly = CPU_SMT_ENABLED;
 EXPORT_SYMBOL_GPL(cpu_smt_control);
 
+static int __init smt_cmdline_disable(char *str)
-void __init cpu_smt_disable(bool force)
 {
+	cpu_smt_control = CPU_SMT_DISABLED;
+	if (str && !strcmp(str, "force")) {
-	if (cpu_smt_control == CPU_SMT_FORCE_DISABLED ||
-		cpu_smt_control == CPU_SMT_NOT_SUPPORTED)
-		return;
-
-	if (force) {
 		pr_info("SMT: Force disabled\n");
 		cpu_smt_control = CPU_SMT_FORCE_DISABLED;
-	} else {
-		cpu_smt_control = CPU_SMT_DISABLED;
 	}
-}
-
-static int __init smt_cmdline_disable(char *str)
-{
-	cpu_smt_disable(str && !strcmp(str, "force"));
 	return 0;
 }
 early_param("nosmt", smt_cmdline_disable);