block: add queue_is_mq() helper

Various spots check for q->mq_ops being non-NULL, but provide
a helper to do this instead.

Where the ->mq_ops != NULL check is redundant, remove it.

Since mq == rq-based now that legacy is gone, get rid of the
queue_is_rq_based() and just use queue_is_mq() everywhere.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 1 insertions, 1 deletions

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index d0a23f0bb3ed..8f0a104770ee 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -2456,7 +2456,7 @@ void blk_throtl_register_queue(struct request_queue *q)
         td->throtl_slice = DFL_THROTL_SLICE_HD;
 #endif
 
-        td->track_bio_latency = !queue_is_rq_based(q);
+        td->track_bio_latency = !queue_is_mq(q);
         if (!td->track_bio_latency)
                 blk_stat_enable_accounting(q);
 }