linux-kernel - Re: [PATCH v9 2/6] drm/log: Introduce a new boot logger to draw the kmsg on the screen

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Message-ID: <feb72a8c-06c1-48d9-abb0-d680c11922a7@web.de>
Date: Wed, 18 Dec 2024 13:25:17 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: Jocelyn Falempe <jfalempe@...hat.com>, dri-devel@...ts.freedesktop.org,
 Caleb Connolly <caleb.connolly@...aro.org>, Daniel Vetter <daniel@...ll.ch>,
 David Airlie <airlied@...il.com>, "Guilherme G. Piccoli"
 <gpiccoli@...lia.com>, Jani Nikula <jani.nikula@...ux.intel.com>,
 Javier Martinez Canillas <javierm@...hat.com>,
 John Ogness <john.ogness@...utronix.de>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Petr Mladek <pmladek@...e.com>,
 Thomas Zimmermann <tzimmermann@...e.de>, bluescreen_avenger@...izon.net
Cc: LKML <linux-kernel@...r.kernel.org>,
 Simona Vetter <simona.vetter@...ll.ch>
Subject: Re: [PATCH v9 2/6] drm/log: Introduce a new boot logger to draw the
 kmsg on the screen

…
> +++ b/drivers/gpu/drm/clients/drm_log.c
> @@ -0,0 +1,370 @@
…
> +static int drm_log_count_modeset(struct drm_client_dev *client)
> +{
> +	struct drm_mode_set *mode_set;
> +	int count = 0;
> +
> +	mutex_lock(&client->modeset_mutex);
> +	drm_client_for_each_modeset(mode_set, client)
> +		count++;
> +	mutex_unlock(&client->modeset_mutex);
> +	return count;
> +}
…

Under which circumstances would you become interested to apply a statement
like “guard(mutex)(&client->modeset_mutex);”?
https://elixir.bootlin.com/linux/v6.13-rc3/source/include/linux/mutex.h#L201

Regards,
Markus