diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index bdff858..ed91684 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -217,6 +217,11 @@
 	int i;
 
 	BUG_ON((gfp_flags & (__GFP_WAIT | __GFP_HIGHMEM)) == __GFP_HIGHMEM);
+	/*
+	 * clear_highpage() will use KM_USER0, so it's a bug to use __GFP_ZERO
+	 * and __GFP_HIGHMEM from hard or soft interrupt context.
+	 */
+	BUG_ON((gfp_flags & __GFP_HIGHMEM) && in_interrupt());
 	for (i = 0; i < (1 << order); i++)
 		clear_highpage(page + i);
 }