diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 8b8349ffa1cd..998f10249f13 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -1457,8 +1457,9 @@ static inline int subsection_map_index(unsigned long pfn)
 static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn)
 {
 	int idx = subsection_map_index(pfn);
+	struct mem_section_usage *usage = READ_ONCE(ms->usage);
 
-	return test_bit(idx, READ_ONCE(ms->usage)->subsection_map);
+	return usage ? test_bit(idx, usage->subsection_map) : 0;
 }
 #else
 static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn)