On Fri, Dec 02, 2016 at 08:15:17PM -0700, Jens Axboe wrote:
> Use MQ variants for MQ, legacy ones for legacy.
>
> Signed-off-by: Jens Axboe <[email protected]>
> ---
> block/blk-core.c | 5 ++++-
> block/blk-exec.c | 10 ++++++++--
> block/blk-flush.c | 14 ++++++++++----
> block/elevator.c | 5 ++++-
> 4 files changed, 26 insertions(+), 8 deletions(-)
>
> diff --git a/block/blk-core.c b/block/blk-core.c
> index 0e23589ab3bf..3591f5419509 100644
> --- a/block/blk-core.c
> +++ b/block/blk-core.c
> @@ -340,7 +340,10 @@ void __blk_run_queue(struct request_queue *q)
> if (unlikely(blk_queue_stopped(q)))
> return;
>
> - __blk_run_queue_uncond(q);
> + if (WARN_ON_ONCE(q->mq_ops))
> + blk_mq_run_hw_queues(q, true);
> + else
This looks odd with the WARN_ON..
> +++ b/block/blk-exec.c
> @@ -80,8 +80,14 @@ void blk_execute_rq_nowait(struct request_queue *q, struct
> gendisk *bd_disk,
> }
>
> __elv_add_request(q, rq, where);
> - __blk_run_queue(q);
> - spin_unlock_irq(q->queue_lock);
> +
> + if (q->mq_ops) {
> + spin_unlock_irq(q->queue_lock);
> + blk_mq_run_hw_queues(q, false);
> + } else {
> + __blk_run_queue(q);
> + spin_unlock_irq(q->queue_lock);
> + }
We already branch out to the blk-mq path earlier in the function.
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