linux-kernel - Re: [PATCH 1/2] blk-mq: adjust debugfs and sysfs register when updating nr_hw

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Message-ID: <bea8e6e0-f9fb-d70b-d8c8-d4b53bf8828c@oracle.com>
Date:   Sat, 29 Sep 2018 11:02:40 +0800
From:   "jianchao.wang" <jianchao.w.wang@...cle.com>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     axboe@...nel.dk, keith.busch@...ux.intel.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] blk-mq: adjust debugfs and sysfs register when
 updating nr_hw_queues

Hi Ming

On 09/29/2018 10:49 AM, Ming Lei wrote:
> Looks both blk_mq_sysfs_register() and blk_mq_debugfs_register_hctx()
> are removed from the path of blk_mq_init_allocated_queue(), so where are
> the two registered for a freshly new queue?

Initially, both of them are registered by following path.
__device_add_disk
  -> blk_register_queue

	if (q->mq_ops) {
		__blk_mq_register_dev(dev, q);
		blk_mq_debugfs_register(q);
	}

blk_mq_init_allocated_queue won't do any thing.

Thanks
Jianchao