linux-kernel - Re: [RFC 1/2] printk: Add kernel parameter: mute

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Message-ID: <845f2370-0b7c-f37a-eb6a-588a3b01d0a8@roeck-us.net>
Date:   Fri, 23 Oct 2020 07:52:11 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Petr Mladek <pmladek@...e.com>,
        John Ogness <john.ogness@...utronix.de>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Shreyas Joshi <shreyas.joshi@...mp.com>,
        shreyasjoshi15@...il.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC 1/2] printk: Add kernel parameter: mute_console

On 10/23/20 4:49 AM, Petr Mladek wrote:
> On Thu 2020-10-22 16:59:15, John Ogness wrote:
>> On 2020-10-22, Guenter Roeck <linux@...ck-us.net> wrote:
>>> The whole point of the exercise is to disable all consoles, including
>>> default ones which are not explicitly specified on the command line.
>>
>> In that case I think specifying something like:
>>
>>     console=null
>>
>> makes that most sense. I think implementing a "null console" driver
>> would be quite simple. Then there would be no need for special handling
>> in the printk subsystem.
> 
> Heh, it actually already exists and has been created for exactly this
> purpose, see the commit 3117ff13f104e98b05b6 ("tty: Add NULL TTY
> driver").
> 

Ok with me to use that, as long as we add code that maps console=
and console=null to console=ttynull.

Guenter

> Regarding the interface:
> 
>    + console=null or console= is OK when people do not want consoles
>      at all
> 
>    + mute_console (or another extra parameter) would be needed if
>      people wanted to have login console.
> 
> It is true that nobody asked for the login support. So, the null
> console should be enough for now.
> 
> Best Regards,
> Petr
>