linux-kernel - Re: [PATCH 1/5] printk/console: Split out code that enables default console

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Date:   Tue, 23 Nov 2021 11:10:18 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Petr Mladek <pmladek@...e.com>
Cc:     John Ogness <john.ogness@...utronix.de>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] printk/console: Split out code that enables default
 console

On (21/11/22 14:26), Petr Mladek wrote:
> Put the code enabling a console by default into a separate function
> called try_enable_default_console().
> 
> Rename try_enable_new_console() to try_enable_preferred_console() to
> make the purpose of the different variants more clear.
> 
> It is a code refactoring without any functional change.
> 
> Signed-off-by: Petr Mladek <pmladek@...e.com>

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

[..]
> -static int try_enable_new_console(struct console *newcon, bool user_specified)
> +static int try_enable_preferred_console(struct console *newcon,
> +					bool user_specified)
>  {
>  	struct console_cmdline *c;
>  	int i, err;
> @@ -2909,6 +2910,23 @@ static int try_enable_new_console(struct console *newcon, bool user_specified)
>  	return -ENOENT;
>  }
>  
> +/* Try to enable the console unconditionally */
> +static void try_enable_default_console(struct console *newcon)
> +{
> +	if (newcon->index < 0)
> +		newcon->index = 0;
> +
> +	if (newcon->setup && newcon->setup(newcon, NULL) != 0)
> +		return;
> +
> +	newcon->flags |= CON_ENABLED;
> +
> +	if (newcon->device) {
> +		newcon->flags |= CON_CONSDEV;
> +		has_preferred_console = true;
> +	}
> +}

try_enable_default_console() also sets preferred_console, as well as
try_enable_preferred_console().