linux-kernel - Re: [PATCH v2 1/1] block/blk-mq: fix RT kernel regression with dedicated quiesce_sync

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Message-ID: <aYulmBtfi3A9TJZu@kbusch-mbp>
Date: Tue, 10 Feb 2026 14:39:36 -0700
From: Keith Busch <kbusch@...nel.org>
To: "Ionut Nechita (Wind River)" <ionut.nechita@...driver.com>
Cc: axboe@...nel.dk, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	ming.lei@...hat.com, muchun.song@...ux.dev,
	mkhalfella@...estorage.com, sunlightlinux@...il.com,
	chris.friesen@...driver.com, stable@...r.kernel.org,
	ionut_n2001@...oo.com, bigeasy@...utronix.de
Subject: Re: [PATCH v2 1/1] block/blk-mq: fix RT kernel regression with
 dedicated quiesce_sync_lock

On Tue, Feb 10, 2026 at 10:49:46PM +0200, Ionut Nechita (Wind River) wrote:
> diff --git a/block/blk-mq.c b/block/blk-mq.c
> index 0ad3dd3329db7..888718a782f88 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -171,7 +171,7 @@ bool __blk_freeze_queue_start(struct request_queue *q,
>  		percpu_ref_kill(&q->q_usage_counter);
>  		mutex_unlock(&q->mq_freeze_lock);
>  		if (queue_is_mq(q))
> -			blk_mq_run_hw_queues(q, false);
> +			blk_mq_run_hw_queues(q, true);

I didn't see the reasoning for this path to run in async mode. Is this
change related to this patch?