linux-kernel - Re: [PATCH v3 2/3] printk: Fix preferred console selection with multiple matches

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Date:   Thu, 13 Feb 2020 14:52:36 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/3] printk: Fix preferred console selection with
 multiple matches

On (20/02/06 15:02), Benjamin Herrenschmidt wrote:
[..]
>  static int __add_preferred_console(char *name, int idx, char *options,
> -				   char *brl_options)
> +				   char *brl_options, bool user_specified)
>  {
>  	struct console_cmdline *c;
>  	int i;
> @@ -2131,6 +2131,8 @@ static int __add_preferred_console(char *name, int idx, char *options,
>  		if (strcmp(c->name, name) == 0 && c->index == idx) {
>  			if (!brl_options)
>  				preferred_console = i;
> +                       if (user_specified)
> +                               c->user_specified = true;
>  			return 0;
>  		}
>  	}
> @@ -2140,6 +2142,7 @@ static int __add_preferred_console(char *name, int idx, char *options,
>  		preferred_console = i;
>  	strlcpy(c->name, name, sizeof(c->name));
>  	c->options = options;
> +	c->user_specified = user_specified;
>  	braille_set_options(c, brl_options);
>  
>  	c->index = idx;
> @@ -2194,7 +2197,7 @@ static int __init console_setup(char *str)
>  	idx = simple_strtoul(s, NULL, 10);
>  	*s = 0;
>  
> -	__add_preferred_console(buf, idx, options, brl_options);
> +	__add_preferred_console(buf, idx, options, brl_options, true);
>  	console_set_on_cmdline = 1;
>  	return 1;
>  }
> @@ -2215,7 +2218,7 @@ __setup("console=", console_setup);
>   */
>  int add_preferred_console(char *name, int idx, char *options)
>  {
> -	return __add_preferred_console(name, idx, options, NULL);
> +	return __add_preferred_console(name, idx, options, NULL, false);
>  }

A silly question:

Can the same console first be added by
	console_setup()->__add_preferred_console(true)
and then by
	add_preferred_console()->__add_preferred_console(false)

	-ss