block: Add fallthrough markers to switch statements
This patch suppresses gcc 7 warnings about falling through in switch
statements when building with W=1. From the gcc documentation: The
-Wimplicit-fallthrough=3 warning is enabled by -Wextra. See also
https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gcc/Warning-Options.html.
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/elevator.c b/block/elevator.c
index dac99fb..4bb2f0c 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -681,6 +681,7 @@
*/
if (elv_attempt_insert_merge(q, rq))
break;
+ /* fall through */
case ELEVATOR_INSERT_SORT:
BUG_ON(blk_rq_is_passthrough(rq));
rq->rq_flags |= RQF_SORTED;