On 12/05/2016 06:07 AM, Christoph Hellwig wrote:
> 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..
It's just a debug thing, should go away.
>> +++ 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.
Ah good point, this is a subset of an earlier branch that also checks
q->elevator.
--
Jens Axboe
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