diff --git a/arch/powerpc/kernel/watchdog.c b/arch/powerpc/kernel/watchdog.c
index 2673ec8bec008707c535081e51d30545ec5988fd..f9b4c6352d24a72f7a45500cfa9991b3287d999f 100644
--- a/arch/powerpc/kernel/watchdog.c
+++ b/arch/powerpc/kernel/watchdog.c
@@ -359,21 +359,17 @@ void watchdog_nmi_stop(void)
 {
 	int cpu;
 
-	cpus_read_lock();
 	for_each_cpu(cpu, &wd_cpus_enabled)
 		stop_wd_on_cpu(cpu);
-	cpus_read_unlock();
 }
 
 void watchdog_nmi_start(void)
 {
 	int cpu;
 
-	cpus_read_lock();
 	watchdog_calc_timeouts();
 	for_each_cpu_and(cpu, cpu_online_mask, &watchdog_cpumask)
 		start_wd_on_cpu(cpu);
-	cpus_read_unlock();
 }
 
 /*
diff --git a/kernel/smpboot.c b/kernel/smpboot.c
index ed7507b69b4801d0f6cee27b9ded1866509b393e..5043e7433f4b15879a6498ed3d1ca6cfa2876f83 100644
--- a/kernel/smpboot.c
+++ b/kernel/smpboot.c
@@ -351,7 +351,7 @@ void smpboot_update_cpumask_percpu_thread(struct smp_hotplug_thread *plug_thread
 	static struct cpumask tmp;
 	unsigned int cpu;
 
-	get_online_cpus();
+	lockdep_assert_cpus_held();
 	mutex_lock(&smpboot_threads_lock);
 
 	/* Park threads that were exclusively enabled on the old mask. */
@@ -367,7 +367,6 @@ void smpboot_update_cpumask_percpu_thread(struct smp_hotplug_thread *plug_thread
 	cpumask_copy(old, new);
 
 	mutex_unlock(&smpboot_threads_lock);
-	put_online_cpus();
 }
 
 static DEFINE_PER_CPU(atomic_t, cpu_hotplug_state) = ATOMIC_INIT(CPU_POST_DEAD);
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 6ad6226535d0e62e549113bd345cc087db023372..fff90fe100071bccf232c782e7bd12632ab84fdc 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -535,7 +535,6 @@ static void softlockup_update_smpboot_threads(void)
 
 	smpboot_update_cpumask_percpu_thread(&watchdog_threads,
 					     &watchdog_allowed_mask);
-	__lockup_detector_cleanup();
 }
 
 /* Temporarily park all watchdog threads */
@@ -554,6 +553,7 @@ static void softlockup_unpark_threads(void)
 
 static void softlockup_reconfigure_threads(void)
 {
+	cpus_read_lock();
 	watchdog_nmi_stop();
 	softlockup_park_all_threads();
 	set_sample_period();
@@ -561,6 +561,12 @@ static void softlockup_reconfigure_threads(void)
 	if (watchdog_enabled && watchdog_thresh)
 		softlockup_unpark_threads();
 	watchdog_nmi_start();
+	cpus_read_unlock();
+	/*
+	 * Must be called outside the cpus locked section to prevent
+	 * recursive locking in the perf code.
+	 */
+	__lockup_detector_cleanup();
 }
 
 /*
@@ -605,9 +611,11 @@ static inline void watchdog_disable_all_cpus(void) { }
 static inline void softlockup_init_threads(void) { }
 static void softlockup_reconfigure_threads(void)
 {
+	cpus_read_lock();
 	watchdog_nmi_stop();
 	lockup_detector_update_enable();
 	watchdog_nmi_start();
+	cpus_read_unlock();
 }
 #endif /* !CONFIG_SOFTLOCKUP_DETECTOR */