linux-kernel - Re: [PATCH v2 06/19] fbcon: Use delayed work for cursor

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Date:   Wed, 9 Feb 2022 00:59:23 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Daniel Vetter <daniel.vetter@...ll.ch>,
        DRI Development <dri-devel@...ts.freedesktop.org>
Cc:     linux-fbdev@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Du Cheng <ducheng2@...il.com>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Claudio Suarez <cssk@...-c.es>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Vetter <daniel.vetter@...el.com>
Subject: Re: [PATCH v2 06/19] fbcon: Use delayed work for cursor

Hello Daniel,

On 2/8/22 22:08, Daniel Vetter wrote:
> Allows us to delete a bunch of hand-rolled stuff. Also to simplify the
> code we initialize the cursor_work completely when we allocate the
> fbcon_ops structure, instead of trying to cope with console
> re-initialization.
> 

Maybe also make it more explicit in the commit message that the delayed
work is replacing a timer that was used before for the cursor ?

> The motiviation here is that fbcon code stops using the fb_info.queue,

motivation

[snip]

>     /*
>      *    This is the interface between the low-level console driver and the
> @@ -68,7 +68,7 @@ struct fbcon_ops {
>  	int  (*update_start)(struct fb_info *info);
>  	int  (*rotate_font)(struct fb_info *info, struct vc_data *vc);
>  	struct fb_var_screeninfo var;  /* copy of the current fb_var_screeninfo */
> -	struct timer_list cursor_timer; /* Cursor timer */
> +	struct delayed_work cursor_work; /* Cursor timer */

A delayed_work uses a timer underneath but I wonder if the comment also
needs to be updated since technically isn't a timer anymore but deferred
work that gets re-scheduled each time on fb_flashcursor().

The patch looks good to me and makes the logic much simpler than before.

Reviewed-by: Javier Martinez Canillas <javierm@...hat.com>

Best regards,
-- 
Javier Martinez Canillas
Linux Engineering
Red Hat