linux-kernel - Re: [RFC PATCH 1/3] workqueue: Add interface for user-defined workqueue lockdep map

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Message-ID: <ZqlqYLZWCiLKhVJf@slm.duckdns.org>
Date: Tue, 30 Jul 2024 12:34:08 -1000
From: Tejun Heo <tj@...nel.org>
To: Matthew Brost <matthew.brost@...el.com>
Cc: intel-xe@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, jiangshanlai@...il.com,
	christian.koenig@....com, ltuikov89@...il.com, daniel@...ll.ch
Subject: Re: [RFC PATCH 1/3] workqueue: Add interface for user-defined
 workqueue lockdep map

Hello, Matthew.

On Tue, Jul 30, 2024 at 03:17:40PM -0700, Matthew Brost wrote:
> +/**
> + * wq_init_user_lockdep_map - init user lockdep map for workqueue
> + * @wq: workqueue to init lockdep map for
> + * @lockdep_map: lockdep map to use for workqueue
> + *
> + * Initialize workqueue with a user defined lockdep map. WQ_USER_OWNED_LOCKDEP
> + * must be set for workqueue.
> + */
> +void wq_init_user_lockdep_map(struct workqueue_struct *wq,
> +			      struct lockdep_map *lockdep_map)
> +{
> +	if (WARN_ON_ONCE(!(wq->flags & WQ_USER_OWNED_LOCKDEP)))
> +		return;
> +
> +	wq->lockdep_map = lockdep_map;
> +}
> +EXPORT_SYMBOL_GPL(wq_init_user_lockdep_map);

Would it be possible to make it a one-piece interface - ie. add
alloc_workqueue_lockdep_map() which takes an external lockdep map rather
than splitting it over two calls?

Thanks.

-- 
tejun