bfq: Annotate fall-through in a switch statement

This patch avoids that gcc 7 issues a warning about fall-through
when building with W=1.

Acked-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 1 insertions, 0 deletions

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 8f3d22330d64..856f4199a470 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -3780,6 +3780,7 @@ bfq_set_next_ioprio_data(struct bfq_queue *bfqq, struct bfq_io_cq *bic)
         default:
                 dev_err(bfqq->bfqd->queue->backing_dev_info->dev,
                         "bfq: bad prio class %d\n", ioprio_class);
+                /* fall through */
         case IOPRIO_CLASS_NONE:
                 /*
                  * No prio set, inherit CPU scheduling settings.