linux-kernel - Re: [PATCH] Documentation/serial-console: Document the behavior when the last console= parameter is not used

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Message-ID: <20230310015448.GD1045797@google.com>
Date:   Fri, 10 Mar 2023 10:54:48 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        Jiri Slaby <jirislaby@...nel.org>,
        Rajnesh Kanwal <rkanwal@...osinc.com>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Documentation/serial-console: Document the behavior when
 the last console= parameter is not used

On (23/03/08 12:24), Petr Mladek wrote:
> 
> The console= kernel command-line parameter defines where the kernel
> messages appear. It can be used multiple times to make the kernel log
> visible on more devices.
> 
> The ordering of the console= parameters is important. In particular,
> the last one defines which device can be accessed also via /dev/console.
> 
> The behavior is more complicated when the last console= parameter is
> ignored by kernel. It might be surprising because it was not intentional.
> The kernel just works this way historically.
> 
> There were few attempts to change the behavior. Unfortunately, it can't
> be done because it would break existing users. Document the historical
> behavior at least.
> 
> Link: https://lore.kernel.org/r/20170606143149.GB7604@pathway.suse.cz
> Link: https://lore.kernel.org/r/20230213113912.1237943-1-rkanwal@rivosinc.com
> Signed-off-by: Petr Mladek <pmladek@...e.com>

Looks good!

Reviewed-by: Sergey Senozhatsky <senozhatsky@...omium.org>