[PATCH] bcache: writeback rate clamping: make 32 bit safe

[Michael Lyle <mlyle@lyle.org>]

Sorry this got through to linux-block, was detected by the kbuilds test
robot.  NSEC_PER_SEC is a long constant; 2.5 * 10^9 doesn't fit in a
signed long constant.

Signed-off-by: Michael Lyle <mlyle@lyle.org>
---
 drivers/md/bcache/util.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/bcache/util.c b/drivers/md/bcache/util.c
index 4dbe37e82877..e548b8b51322 100644
--- a/drivers/md/bcache/util.c
+++ b/drivers/md/bcache/util.c
@@ -238,8 +238,8 @@ uint64_t bch_next_delay(struct bch_ratelimit *d, uint64_t done)
 	 * don't let us sleep more than 2.5 seconds (so we can notice/respond
 	 * if the control system tells us to speed up!).
 	 */
-	if (time_before64(now + NSEC_PER_SEC * 5 / 2, d->next))
-		d->next = now + NSEC_PER_SEC * 5 / 2;
+	if (time_before64(now + NSEC_PER_SEC * 5LLU / 2LLU, d->next))
+		d->next = now + NSEC_PER_SEC * 5LLU / 2LLU;
 
 	if (time_after64(now - NSEC_PER_SEC * 2, d->next))
 		d->next = now - NSEC_PER_SEC * 2;
-- 
2.11.0