linux-kernel - Re: [PATCH V2 0/3] blk-mq/nvme-loop: use nvme-loop's lock class for addressing lockdep false positive warning

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Date:   Tue, 8 Dec 2020 09:40:19 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-block@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Qian Cai <cai@...hat.com>,
        Sumit Saxena <sumit.saxena@...adcom.com>,
        John Garry <john.garry@...wei.com>,
        Kashyap Desai <kashyap.desai@...adcom.com>,
        Bart Van Assche <bvanassche@....org>,
        Hannes Reinecke <hare@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 0/3] blk-mq/nvme-loop: use nvme-loop's lock class for
 addressing lockdep false positive warning

On Thu, Dec 03, 2020 at 09:26:35AM +0800, Ming Lei wrote:
> Hi,
> 
> Qian reported there is hang during booting when shared host tagset is
> introduced on megaraid sas. Sumit reported the whole SCSI probe takes
> about ~45min in his test.
> 
> Turns out it is caused by nr_hw_queues increased, especially commit
> b3c6a5997541("block: Fix a lockdep complaint triggered by request queue flushing")
> adds synchronize_rcu() for each hctx's release handler.
> 
> Address the original lockdep false positive warning by simpler way, then
> long scsi probe can be avoided with lockdep enabled.
> 
> V2:
> 	- add reviewed-by
> 	- adjust commit log of patch 3
> 
> Ming Lei (3):
>   blk-mq: add new API of blk_mq_hctx_set_fq_lock_class
>   nvme-loop: use blk_mq_hctx_set_fq_lock_class to set loop's lock class
>   Revert "block: Fix a lockdep complaint triggered by request queue
>     flushing"
> 
>  block/blk-flush.c          | 30 +++++++++++++++++++++++++-----
>  block/blk.h                |  1 -
>  drivers/nvme/target/loop.c | 10 ++++++++++
>  include/linux/blk-mq.h     |  3 +++
>  4 files changed, 38 insertions(+), 6 deletions(-)
> 
> Cc: Christoph Hellwig <hch@....de>
> Cc: Qian Cai <cai@...hat.com>
> Cc: Sumit Saxena <sumit.saxena@...adcom.com>
> Cc: John Garry <john.garry@...wei.com>
> Cc: Kashyap Desai <kashyap.desai@...adcom.com>
> Cc: Bart Van Assche <bvanassche@....org>
> Cc: Hannes Reinecke <hare@...e.de>
> -- 
> 2.28.0
> 

Hello Jens,

Ping...

-- 
Ming