linux-kernel - Re: [PATCH] vt: remove old FONT ioctls definitions in uapi

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Date:   Thu, 28 Jul 2022 10:26:10 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Xingrui Yi <yixingrui@...ux.alibaba.com>
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vt: remove old FONT ioctls definitions in uapi

On Fri, Jul 22, 2022 at 02:11:33PM +0800, Xingrui Yi wrote:
> As was demonstrated by commit ff2047fb755d ("vt: drop old FONT ioctls"),
> old font ioctls like PIO_FONT have been deleted and KDFONTOP ioctl is used
> for years instead.
> 
> However, unused definitions of these ioctl numbers and "strut
> consolefontdesc" still exist in a uapi header. They could have been removed
> since no userspace was using them. Otherwise they will become a
> misleading for users, and users will fail with ENOTTY with wrong call.
> 
> We are moving old font ioctl numbers definitions here to guide users to
> use KDFONTOP.
> 
> Signed-off-by: Xingrui Yi <yixingrui@...ux.alibaba.com>
> ---
>  include/uapi/linux/kd.h | 13 -------------
>  1 file changed, 13 deletions(-)
> 
> diff --git a/include/uapi/linux/kd.h b/include/uapi/linux/kd.h
> index ee929ece4112..d739b17fc942 100644
> --- a/include/uapi/linux/kd.h
> +++ b/include/uapi/linux/kd.h
> @@ -6,19 +6,6 @@
>  
>  /* 0x4B is 'K', to avoid collision with termios and vt */
>  
> -#define GIO_FONT	0x4B60	/* gets font in expanded form */
> -#define PIO_FONT	0x4B61	/* use font in expanded form */
> -
> -#define GIO_FONTX	0x4B6B	/* get font using struct consolefontdesc */
> -#define PIO_FONTX	0x4B6C	/* set font using struct consolefontdesc */
> -struct consolefontdesc {
> -	unsigned short charcount;	/* characters in font (256 or 512) */
> -	unsigned short charheight;	/* scan lines per character (1-32) */
> -	char __user *chardata;		/* font data in expanded form */
> -};
> -
> -#define PIO_FONTRESET   0x4B6D	/* reset to default font */
> -
>  #define GIO_CMAP	0x4B70	/* gets colour palette on VGA+ */
>  #define PIO_CMAP	0x4B71	/* sets colour palette on VGA+ */
>  

Did you rebuild a distribution like Debian to verify that these values
and structure are not used anywhere?

thanks,

greg k-h