linux-kernel - Re: [PATCH v8 00/14] lockdep: Implement crossrelease feature

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Date:   Thu, 17 Aug 2017 09:48:11 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     Byungchul Park <byungchul.park@....com>,
        Thomas Gleixner <tglx@...utronix.de>, peterz@...radead.org,
        walken@...gle.com, kirill@...temov.name,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, willy@...radead.org, npiggin@...il.com,
        kernel-team@....com
Subject: Re: [PATCH v8 00/14] lockdep: Implement crossrelease feature


* Boqun Feng <boqun.feng@...il.com> wrote:

> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -2431,6 +2431,27 @@ struct wq_barrier {
>  	struct task_struct	*task;	/* purely informational */
>  };
>  
> +#ifdef CONFIG_LOCKDEP_COMPLETE
> +# define INIT_WQ_BARRIER_ONSTACK(barr, func, target)				\
> +do {										\
> +	INIT_WORK_ONSTACK(&(barr)->work, func);					\
> +	__set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(&(barr)->work));	\
> +	lockdep_init_map_crosslock((struct lockdep_map *)&(barr)->done.map,	\
> +				   "(complete)" #barr,				\
> +				   (target)->lockdep_map.key, 1); 		\
> +	__init_completion(&barr->done);						\
> +	barr->task = current;							\
> +} while (0)
> +#else
> +# define INIT_WQ_BARRIER_ONSTACK(barr, func, target)				\
> +do {										\
> +	INIT_WORK_ONSTACK(&(barr)->work, func);					\
> +	__set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(&(barr)->work));	\
> +	init_completion(&barr->done);						\
> +	barr->task = current;							\
> +} while (0)
> +#endif

Is there any progress with this bug? This false positive warning regression is 
blocking the locking tree.

BTW., I don't think the #ifdef is necessary: lockdep_init_map_crosslock should map 
to nothing when lockdep is disabled, right?

Thanks,

	Ingo