diff --git a/mm/ksm.c b/mm/ksm.c
index 6a831009b4cb..5d60d5385de6 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1099,9 +1099,9 @@ static int unmerge_and_remove_all_rmap_items(void)
 static u32 calc_checksum(struct page *page)
 {
 	u32 checksum;
-	void *addr = kmap_atomic(page);
+	void *addr = kmap_local_page(page);
 	checksum = xxhash(addr, PAGE_SIZE, 0);
-	kunmap_atomic(addr);
+	kunmap_local(addr);
 	return checksum;
 }