linux-kernel - Re: [PATCH 2/2] drm/debugfs: add descriptions to struct parameters

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Date:   Fri, 6 Jan 2023 21:19:04 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Maíra Canal <mcanal@...lia.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Melissa Wen <mwen@...lia.com>,
        André Almeida <andrealmeid@...lia.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 2/2] drm/debugfs: add descriptions to struct parameters

On Thu, Jan 05, 2023 at 04:30:39PM -0300, Maíra Canal wrote:
> The structs drm_debugfs_info and drm_debugfs_entry don't have
> descriptions for their parameters, which is causing the following warnings:
> 
> include/drm/drm_debugfs.h:93: warning: Function parameter or member
> 'name' not described in 'drm_debugfs_info'
> include/drm/drm_debugfs.h:93: warning: Function parameter or member
> 'show' not described in 'drm_debugfs_info'
> include/drm/drm_debugfs.h:93: warning: Function parameter or member
> 'driver_features' not described in 'drm_debugfs_info'
> include/drm/drm_debugfs.h:93: warning: Function parameter or member
> 'data' not described in 'drm_debugfs_info'
> include/drm/drm_debugfs.h:105: warning: Function parameter or member
> 'dev' not described in 'drm_debugfs_entry'
> include/drm/drm_debugfs.h:105: warning: Function parameter or member
> 'file' not described in 'drm_debugfs_entry'
> include/drm/drm_debugfs.h:105: warning: Function parameter or member
> 'list' not described in 'drm_debugfs_entry'
> 
> Therefore, fix the warnings by adding descriptions to all struct
> parameters.
> 
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Signed-off-by: Maíra Canal <mcanal@...lia.com>
> ---
>  include/drm/drm_debugfs.h | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/include/drm/drm_debugfs.h b/include/drm/drm_debugfs.h
> index 53b7297260a5..7616f457ce70 100644
> --- a/include/drm/drm_debugfs.h
> +++ b/include/drm/drm_debugfs.h
> @@ -86,9 +86,22 @@ struct drm_info_node {
>   * core.
>   */
>  struct drm_debugfs_info {
> +	/** @name: File name */
>  	const char *name;
> +
> +	/**
> +	 * @show:
> +	 *
> +	 * Show callback. &seq_file->private will be set to the &struct
> +	 * drm_debugfs_entry corresponding to the instance of this info
> +	 * on a given &struct drm_device.

So this is a bit late, but why don't we pass that drm_debugfs_entry as an
explicit parameter? Or maybe just the struct drm_device, because that and
the void *data is really all there is to pass along. Would give us more
type-safety, which really is the main reason for having drm-specific
debugfs functions.

Either way, on the series: Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>

> +	 */
>  	int (*show)(struct seq_file*, void*);
> +
> +	/** @driver_features: Required driver features for this entry. */
>  	u32 driver_features;
> +
> +	/** @data: Driver-private data, should not be device-specific. */
>  	void *data;
>  };
>  
> @@ -99,8 +112,13 @@ struct drm_debugfs_info {
>   * drm_debugfs_info on a &struct drm_device.
>   */
>  struct drm_debugfs_entry {
> +	/** @dev: &struct drm_device for this node. */
>  	struct drm_device *dev;
> +
> +	/** @file: Template for this node. */
>  	struct drm_debugfs_info file;
> +
> +	/** @list: Linked list of all device nodes. */
>  	struct list_head list;
>  };
>  
> -- 
> 2.39.0
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch