From: Daniel Wagner <dwagner@suse.de>
To: John Ogness <john.ogness@linutronix.de>
Cc: Jens Axboe <axboe@kernel.dk>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Thomas Gleixner <tglx@linutronix.de>,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] block: remove unnecessary ioc nested locking
Date: Tue, 23 Jun 2020 13:50:52 +0200 [thread overview]
Message-ID: <20200623115052.comb37q22kjgzyen@beryllium.lan> (raw)
In-Reply-To: <20200619151718.22338-2-john.ogness@linutronix.de>
On Fri, Jun 19, 2020 at 05:23:17PM +0206, John Ogness wrote:
> The legacy CFQ IO scheduler could call put_io_context() in its exit_icq()
> elevator callback. This led to a lockdep warning, which was fixed in
> commit d8c66c5d5924 ("block: fix lockdep warning on io_context release
> put_io_context()") by using a nested subclass for the ioc spinlock.
> However, with commit f382fb0bcef4 ("block: remove legacy IO schedulers")
> the CFQ IO scheduler no longer exists.
>
> The BFQ IO scheduler also implements the exit_icq() elevator callback but
> does not call put_io_context().
>
> The nested subclass for the ioc spinlock is no longer needed. Since it
> existed as an exception and no longer applies, remove the nested subclass
> usage.
>
> Signed-off-by: John Ogness <john.ogness@linutronix.de>
As far I can tell, looks good.
Reviewed-by: Daniel Wagner <dwagner@suse.de>
next prev parent reply other threads:[~2020-06-23 11:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-19 15:17 [PATCH 0/2] block: remove retry loop John Ogness
2020-06-19 15:17 ` [PATCH 1/2] block: remove unnecessary ioc nested locking John Ogness
2020-06-23 11:50 ` Daniel Wagner [this message]
2020-06-19 15:17 ` [PATCH 2/2] block: remove retry loop in ioc_release_fn() John Ogness
2020-06-23 14:30 ` Daniel Wagner
2020-07-16 16:23 ` [PATCH 0/2] block: remove retry loop Jens Axboe
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