linux-kernel - Re: [PATCH] char: ttyprintk: register console

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Message-ID: <YhPZeDBlrHjLcgPh@kroah.com>
Date:   Mon, 21 Feb 2022 19:27:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>
Cc:     Arnd Bergmann <arnd@...db.de>, kernel@...s.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] char: ttyprintk: register console

On Tue, Feb 15, 2022 at 03:17:49PM +0100, Vincent Whitchurch wrote:
> Register a console in the ttyprintk driver so that it can be selected
> for /dev/console with console=ttyprintk on the kernel command line,
> similar to other console drivers.
> 
> Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
> ---
>  drivers/char/Kconfig     |  3 ++-
>  drivers/char/ttyprintk.c | 16 ++++++++++++++++
>  2 files changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
> index 740811893c57..c553a8a50d03 100644
> --- a/drivers/char/Kconfig
> +++ b/drivers/char/Kconfig
> @@ -18,7 +18,8 @@ config TTY_PRINTK
>  	  The feature is useful to inline user messages with kernel
>  	  messages.
>  	  In order to use this feature, you should output user messages
> -	  to /dev/ttyprintk or redirect console to this TTY.
> +	  to /dev/ttyprintk or redirect console to this TTY, or boot
> +	  the kernel with console=ttyprintk.

Why do you want to use this tty device as a console?  What benifit does
that provide?

thanks,

greg k-h