linux-kernel - Re: [PATCH v2 1/2] console: Remove dummy con_font

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Date:   Mon, 2 Nov 2020 10:47:55 +0100
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Peilin Ye <yepeilin.cs@...il.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Winischhofer <thomas@...ischhofer.net>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Nicolas Pitre <nico@...xnic.net>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        George Kennedy <george.kennedy@...cle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Peter Rosin <peda@...ntia.se>, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org
Subject: Re: [PATCH v2 1/2] console: Remove dummy con_font_op() callback
 implementations

On 02. 11. 20, 10:36, Peilin Ye wrote:
> `struct console_font` is a UAPI structure, thus ideally should not be
> used for kernel internal abstraction. Remove some dummy .con_font_set,
> .con_font_default and .con_font_copy `struct consw` callback
> implementations, to make it cleaner.

ESEMANTIC_ERROR.

1) What do you refer to with the last "it"?

2) What's the purpose of mentioning struct console_font at all?

3) Could you clarify whether you checked it is safe to remove the hooks?

4) All the hooks now return ENOSYS for both consoles (and not 0). Is 
this intentional?

I know answers to the first 3 questions, but you need to elaborate a bit 
in the commit log to connect those sentences. Esp. for people not 
dealing with the code on a daily basis. Ad 4) I am not sure.

> Suggested-by: Daniel Vetter <daniel@...ll.ch>
> Signed-off-by: Peilin Ye <yepeilin.cs@...il.com>
> ---
> Change in v2:
>    - [v2 2/2] no longer Cc: stable, so do not Cc: stable
> 
> Context: https://lore.kernel.org/lkml/CAKMK7uFY2zv0adjKJ_ORVFT7Zzwn075MaU0rEU7_FuqENLR=UA@mail.gmail.com/
> 
>   drivers/usb/misc/sisusbvga/sisusb_con.c | 21 ---------------------
>   drivers/video/console/dummycon.c        | 20 --------------------
>   2 files changed, 41 deletions(-)
> 
> diff --git a/drivers/usb/misc/sisusbvga/sisusb_con.c b/drivers/usb/misc/sisusbvga/sisusb_con.c
> index c63e545fb105..dfa0d5ce6012 100644
> --- a/drivers/usb/misc/sisusbvga/sisusb_con.c
> +++ b/drivers/usb/misc/sisusbvga/sisusb_con.c
> @@ -1345,24 +1345,6 @@ static int sisusbdummycon_blank(struct vc_data *vc, int blank, int mode_switch)
>   	return 0;
>   }
>   
> -static int sisusbdummycon_font_set(struct vc_data *vc,
> -				   struct console_font *font,
> -				   unsigned int flags)
> -{
> -	return 0;
> -}
> -
> -static int sisusbdummycon_font_default(struct vc_data *vc,
> -				       struct console_font *font, char *name)
> -{
> -	return 0;
> -}
> -
> -static int sisusbdummycon_font_copy(struct vc_data *vc, int con)
> -{
> -	return 0;
> -}
> -
>   static const struct consw sisusb_dummy_con = {
>   	.owner =		THIS_MODULE,
>   	.con_startup =		sisusbdummycon_startup,
> @@ -1375,9 +1357,6 @@ static const struct consw sisusb_dummy_con = {
>   	.con_scroll =		sisusbdummycon_scroll,
>   	.con_switch =		sisusbdummycon_switch,
>   	.con_blank =		sisusbdummycon_blank,
> -	.con_font_set =		sisusbdummycon_font_set,
> -	.con_font_default =	sisusbdummycon_font_default,
> -	.con_font_copy =	sisusbdummycon_font_copy,
>   };
>   
>   int
> diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c
> index 2a0d0bda7faa..f1711b2f9ff0 100644
> --- a/drivers/video/console/dummycon.c
> +++ b/drivers/video/console/dummycon.c
> @@ -124,23 +124,6 @@ static int dummycon_switch(struct vc_data *vc)
>   	return 0;
>   }
>   
> -static int dummycon_font_set(struct vc_data *vc, struct console_font *font,
> -			     unsigned int flags)
> -{
> -	return 0;
> -}
> -
> -static int dummycon_font_default(struct vc_data *vc,
> -				 struct console_font *font, char *name)
> -{
> -	return 0;
> -}
> -
> -static int dummycon_font_copy(struct vc_data *vc, int con)
> -{
> -	return 0;
> -}
> -
>   /*
>    *  The console `switch' structure for the dummy console
>    *
> @@ -159,8 +142,5 @@ const struct consw dummy_con = {
>   	.con_scroll =	dummycon_scroll,
>   	.con_switch =	dummycon_switch,
>   	.con_blank =	dummycon_blank,
> -	.con_font_set =	dummycon_font_set,
> -	.con_font_default =	dummycon_font_default,
> -	.con_font_copy =	dummycon_font_copy,
>   };
>   EXPORT_SYMBOL_GPL(dummy_con);
> 


-- 
js
suse labs