diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index f3c4f9d..17f6008 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2399,7 +2399,6 @@
 
 	VM_BUG_ON_PAGE(is_huge_zero_page(page), page);
 	VM_BUG_ON_PAGE(!PageLocked(page), page);
-	VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
 	VM_BUG_ON_PAGE(!PageCompound(page), page);
 
 	if (PageAnon(head)) {
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index ba40b7f..88e4b17 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -483,8 +483,7 @@
 
 static void release_pte_page(struct page *page)
 {
-	/* 0 stands for page_is_file_cache(page) == false */
-	dec_node_page_state(page, NR_ISOLATED_ANON + 0);
+	dec_node_page_state(page, NR_ISOLATED_ANON + page_is_file_cache(page));
 	unlock_page(page);
 	putback_lru_page(page);
 }
@@ -532,7 +531,6 @@
 
 		VM_BUG_ON_PAGE(PageCompound(page), page);
 		VM_BUG_ON_PAGE(!PageAnon(page), page);
-		VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
 
 		/*
 		 * We can do it before isolate_lru_page because the
@@ -579,8 +577,8 @@
 			result = SCAN_DEL_PAGE_LRU;
 			goto out;
 		}
-		/* 0 stands for page_is_file_cache(page) == false */
-		inc_node_page_state(page, NR_ISOLATED_ANON + 0);
+		inc_node_page_state(page,
+				NR_ISOLATED_ANON + page_is_file_cache(page));
 		VM_BUG_ON_PAGE(!PageLocked(page), page);
 		VM_BUG_ON_PAGE(PageLRU(page), page);
 
diff --git a/mm/migrate.c b/mm/migrate.c
index 5c5df09..b32630d 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1944,7 +1944,8 @@
 
 	/* Prepare a page as a migration target */
 	__SetPageLocked(new_page);
-	__SetPageSwapBacked(new_page);
+	if (PageSwapBacked(page))
+		__SetPageSwapBacked(new_page);
 
 	/* anon mapping, we can simply copy page->mapping to the new page: */
 	new_page->mapping = page->mapping;
diff --git a/mm/rmap.c b/mm/rmap.c
index d7b6d78..b4084d0 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1424,7 +1424,8 @@
 			 * Store the swap location in the pte.
 			 * See handle_pte_fault() ...
 			 */
-			VM_BUG_ON_PAGE(!PageSwapCache(page), page);
+			VM_BUG_ON_PAGE(!PageSwapCache(page) && PageSwapBacked(page),
+				page);
 
 			if (!PageDirty(page)) {
 				/* It's a freeable page by MADV_FREE */