--- x/lib/flex_proportions.c
+++ y/lib/flex_proportions.c
@@ -64,12 +64,14 @@ void fprop_global_destroy(struct fprop_g
 bool fprop_new_period(struct fprop_global *p, int periods)
 {
 	s64 events = percpu_counter_sum(&p->events);
+	unsigned long flags;
 
 	/*
 	 * Don't do anything if there are no events.
 	 */
 	if (events <= 1)
 		return false;
+	local_irq_save(flags);
 	preempt_disable_nested();
 	write_seqcount_begin(&p->sequence);
 	if (periods < 64)
@@ -79,6 +81,7 @@ bool fprop_new_period(struct fprop_globa
 	p->period += periods;
 	write_seqcount_end(&p->sequence);
 	preempt_enable_nested();
+	local_irq_restore(flags);
 
 	return true;
 }