linux-kernel - Re: [PATCH v2] blk_iocost: remove some duplicate irq disable/enables

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Message-ID: <Zv8NBM4mOVoMoBQS@slm.duckdns.org>
Date: Thu, 3 Oct 2024 11:30:44 -1000
From: Tejun Heo <tj@...nel.org>
To: Jens Axboe <axboe@...nel.dk>
Cc: Dan Carpenter <dan.carpenter@...aro.org>,
	Waiman Long <longman@...hat.com>, Yu Kuai <yukuai3@...wei.com>,
	Josef Bacik <josef@...icpanda.com>, cgroups@...r.kernel.org,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2] blk_iocost: remove some duplicate irq disable/enables

On Thu, Oct 03, 2024 at 11:22:09AM -1000, Tejun Heo wrote:
> Yeah, that should be spin_lock_irq() for consistency but at the same time it
> doesn't look like anything is actually grabbing that lock (or blkcg->lock
> nesting outside of it) from an IRQ context, so no actual deadlock scenario
> exists and lockdep doesn't trigger.

Oh, wait, it's not that. blkg_conf_prep() implies queue_lock, so the IRQ is
disabled around it and adding _irq will trigger lockdep.

Thanks.

-- 
tejun