linux-kernel - Re: [RFC PATCH v2 1/3] printk: Add function to set console to preferred console's driver

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Message-ID: <20200513053529.GL413@jagdpanzerIV.localdomain>
Date:   Wed, 13 May 2020 14:35:29 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Alper Nebi Yasak <alpernebiyasak@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-serial@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        "David S. Miller" <davem@...emloft.net>,
        Feng Tang <feng.tang@...el.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [RFC PATCH v2 1/3] printk: Add function to set console to
 preferred console's driver

On (20/04/30 19:14), Alper Nebi Yasak wrote:
[..]
> +int update_console_to_preferred(void)
> +{
> +	struct console_cmdline *c = NULL;
> +	struct console *con = NULL;
> +	struct console *tmp = NULL;
> +
> +	if (preferred_console >= 0)
> +		c = &console_cmdline[preferred_console];
> +
> +	if (!c || !c->name[0])
> +		return 0;
> +
> +	for_each_console(con) {
> +		if (!con->next || !(con->next->flags & CON_ENABLED))
> +			continue;
> +		if (strcmp(c->name, con->next->name) != 0)
> +			continue;

This matches the consoles by exact name. Consoles can have aliases,
but matching by alias is rather complex and it has some side effects.

Let me Cc more people on this. VT has a console takeover logic,
I wonder if we can extend the takeover code somehow.

Daniel, any thoughts?

https://lore.kernel.org/lkml/20200430161438.17640-1-alpernebiyasak@gmail.com

	-ss