diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index b5ad646..108ef7a 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -646,6 +646,9 @@
 	 */
 	for (pfn = start_pfn; pfn < end_pfn; pfn += 1ul << order) {
 		order = min(MAX_ORDER - 1, get_order(PFN_PHYS(end_pfn - pfn)));
+		/* __free_pages_core() wants pfns to be aligned to the order */
+		if (unlikely(!IS_ALIGNED(pfn, 1ul << order)))
+			order = 0;
 		(*online_page_callback)(pfn_to_page(pfn), order);
 	}