linux-kernel - Re: [PATCH v7 21/23] block: Avoid that flushing triggers a lockdep complaint

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190226172421.GI32494@hirez.programming.kicks-ass.net>
Date:   Tue, 26 Feb 2019 18:24:21 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     mingo@...hat.com, will.deacon@....com, tj@...nel.org,
        longman@...hat.com, johannes.berg@...el.com,
        linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        Ming Lei <ming.lei@...hat.com>, Theodore Ts'o <tytso@....edu>
Subject: Re: [PATCH v7 21/23] block: Avoid that flushing triggers a lockdep
 complaint

On Thu, Feb 14, 2019 at 03:00:56PM -0800, Bart Van Assche wrote:
> @@ -472,7 +473,8 @@ struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q,
>  	if (!fq)
>  		goto fail;
>  
> -	spin_lock_init(&fq->mq_flush_lock);
> +	lockdep_register_key(&fq->key);
> +	spin_lock_init_key(&fq->mq_flush_lock, &fq->key);

What's wrong with:

	spin_lock_init(&fq->wq_flush_lock);
	lockdep_register_key(&fq->key);
	lockdep_set_class(&fq->wq_flush_lock, &fq->key);

?