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

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Message-ID: <CAHk-=wif0QueN8ovkm_x7TsOgOHjRrOa4wU-zHgBP=FTAnzvNA@mail.gmail.com>
Date:   Fri, 23 Oct 2020 08:59:17 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        Guenter Roeck <linux@...ck-us.net>,
        Shreyas Joshi <shreyas.joshi@...mp.com>,
        shreyasjoshi15@...il.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 1/2] printk: Add kernel parameter: mute_console

On Thu, Oct 22, 2020 at 4:42 AM Petr Mladek <pmladek@...e.com> wrote:
>
> Users use various undocumented ways how to completely disable
> console output. It is usually done by passing an invalid console
> name, for example, console="", console=null.
>
> It mostly works but just by chance.

Honestly, since that 'console=""' seems to be out in the wild, I think
we might as well just (a) document it, and (b) make sure it works by
more than chance.

That said, I also like John Ogness' suggestion to have it as a
per-console option to mute a particular console. At least that seems
like a perfectly fine extension.

I don't really see the point of a whole new "mute_console" option,
considering that people already figured out an alternate way to do it
that we'd have to support going forward anyway. Just make that the
standard.

             Linus