1 files changed, 2 insertions, 2 deletions

diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 5e45e39a8a8d..44ad1607be2d 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -1178,8 +1178,8 @@ static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask,
          * by one word.  Thanks to Lynn Kerby for the fix and James McMechan
          * for the original diagnosis.
          */
-        if(*cow_offset == ((bitmap_len + sizeof(unsigned long) - 1) /
-                           sizeof(unsigned long) - 1))
+        if (*cow_offset == (DIV_ROUND_UP(bitmap_len,
+                                         sizeof(unsigned long)) - 1))
                 (*cow_offset)--;
 
         bitmap_words[0] = bitmap[*cow_offset];