diff --git a/mm/compaction.c b/mm/compaction.c
index 509dee7c2f384944ee78f73b5a6415621b85989c..8e8017d909b745973d44c75eeea1bc7e11a9d5f8 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -2949,7 +2949,8 @@ static int kcompactd_cpu_online(unsigned int cpu)
 
 		if (cpumask_any_and(cpu_online_mask, mask) < nr_cpu_ids)
 			/* One of our CPUs online: restore mask */
-			set_cpus_allowed_ptr(pgdat->kcompactd, mask);
+			if (pgdat->kcompactd)
+				set_cpus_allowed_ptr(pgdat->kcompactd, mask);
 	}
 	return 0;
 }