uml: use DIV_ROUND_UP

I just saw similar patches in the janitor kernel's list, and spotted place it
fits.

Signed-off-by: Jiri Olsa <olsajiri@gmail.com>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 5e45e39a8a8db5a5c57e4f27162804773c465c9e..44ad1607be2dc0d0d14d6a7d8539ffce94c452d7 100644 (file)
--- 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];