linux-kernel - Re: [PATCH v12 03/10] ref_tracker: add a top level debugfs directory for ref

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Message-ID: <378d6754aad9991b859a5c2136f4a4211e9fafea@intel.com>
Date: Wed, 04 Jun 2025 12:12:25 +0300
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Jeff Layton <jlayton@...nel.org>, Andrew Morton
 <akpm@...ux-foundation.org>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo
 Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, Maarten
 Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard
 <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, David
 Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, Joonas
 Lahtinen <joonas.lahtinen@...ux.intel.com>, Rodrigo Vivi
 <rodrigo.vivi@...el.com>, Tvrtko Ursulin <tursulin@...ulin.net>
Cc: Kuniyuki Iwashima <kuniyu@...zon.com>, Qasim Ijaz <qasdev00@...il.com>,
 Nathan Chancellor <nathan@...nel.org>, Andrew Lunn <andrew@...n.ch>,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org, Jeff
 Layton <jlayton@...nel.org>
Subject: Re: [PATCH v12 03/10] ref_tracker: add a top level debugfs
 directory for ref_tracker

On Thu, 29 May 2025, Jeff Layton <jlayton@...nel.org> wrote:
> Add a new "ref_tracker" directory in debugfs. Each individual refcount
> tracker can register files under there to display info about
> currently-held references.
>
> Reviewed-by: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: Jeff Layton <jlayton@...nel.org>
> ---
>  lib/ref_tracker.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/lib/ref_tracker.c b/lib/ref_tracker.c
> index de71439e12a3bab6456910986fa611dfbdd97980..d374e5273e1497cac0d70c02c282baa2c3ab63fe 100644
> --- a/lib/ref_tracker.c
> +++ b/lib/ref_tracker.c
> @@ -273,3 +273,16 @@ int ref_tracker_free(struct ref_tracker_dir *dir,
>  	return 0;
>  }
>  EXPORT_SYMBOL_GPL(ref_tracker_free);
> +
> +#ifdef CONFIG_DEBUG_FS
> +#include <linux/debugfs.h>
> +
> +static struct dentry *ref_tracker_debug_dir = (struct dentry *)-ENOENT;

Nitpick, please prefer ERR_PTR(-ENOENT) over casting inline.

BR,
Jani.

> +
> +static int __init ref_tracker_debugfs_init(void)
> +{
> +	ref_tracker_debug_dir = debugfs_create_dir("ref_tracker", NULL);
> +	return 0;
> +}
> +late_initcall(ref_tracker_debugfs_init);
> +#endif /* CONFIG_DEBUG_FS */

-- 
Jani Nikula, Intel