DRBD: Fix comparison always false warning due to long/long long compare

Fix warnings of the following nature in the drbd header:

In file included from drivers/block/drbd/drbd_bitmap.c:32:
drivers/block/drbd/drbd_int.h: In function 'drbd_get_syncer_progress':
drivers/block/drbd/drbd_int.h:2234: warning: comparison is always false due to limited range of data

where mdev->rs_total (an unsigned long) is being compared to 1ULL << 32, which
is always false on a 32-bit machine.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 8d68056..2be057b 100644 (file)
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -2230,7 +2230,7 @@ static inline void drbd_get_syncer_progress(struct drbd_conf *mdev,
                 * Note: currently we don't support such large bitmaps on 32bit
                 * arch anyways, but no harm done to be prepared for it here.
                 */
-               unsigned int shift = mdev->rs_total >= (1ULL << 32) ? 16 : 10;
+               unsigned int shift = mdev->rs_total > UINT_MAX ? 16 : 10;
                unsigned long left = *bits_left >> shift;
                unsigned long total = 1UL + (mdev->rs_total >> shift);
                unsigned long tmp = 1000UL - left * 1000UL/total;