On 03/30/2017 11:53 AM, Jens Axboe wrote:=0A=

This adds a new module parameter to null_blk, blocking. If set, null_blk=

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will set the BLK_MQ_F_BLOCKING flag, indicating that it sometimes/always=

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needs to block in its ->queue_rq() function.  The intent is to help find=

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regressions in blocking drivers, since not many of them exist.=0A=
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If null_blk is loaded with submit_queues > 1 and blocking=3D1, this=0A=
shows the regression recently fixed by bf4907c05e61.=0A=

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Reviewed-by: Bart Van Assche <redacted>=0A=