linux-kernel - Re: [PATCH v7 1/7] printk: Save console options for add_preferred_console

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Message-ID: <Zl8T-0zpTYy5GFau@tlindgre-MOBL1>
Date: Tue, 4 Jun 2024 16:17:47 +0300
From: Tony Lindgren <tony.lindgren@...ux.intel.com>
To: Petr Mladek <pmladek@...e.com>
Cc: Tony Lindgren <tony@...mide.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>, Jonathan Corbet <corbet@....net>,
	Steven Rostedt <rostedt@...dmis.org>,
	John Ogness <john.ogness@...utronix.de>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	"David S . Miller" <davem@...emloft.net>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Dhruva Gole <d-gole@...com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Johan Hovold <johan@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Vignesh Raghavendra <vigneshr@...com>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org, Sebastian Reichel <sre@...nel.org>,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH v7 1/7] printk: Save console options for
 add_preferred_console_match()

On Fri, May 31, 2024 at 09:54:42AM +0300, Tony Lindgren wrote:
> On Fri, May 24, 2024 at 06:06:21PM +0200, Petr Mladek wrote:
> > A solution might be to store "devname" separately in
> > struct console_cmdline and allow empty "name". We could
> > implement then a function similar to
> > add_preferred_console_match() which would try to match
> > "devname" and set/update "name", "index" value when matched.
> 
> This sounds nice, the empty name can be used to defer consoles that
> are not known early. And on console_setup() we only set the devname
> for such cases.

Yup reserving a slot for a devname console at console_setup() time
in console_commandline[] allows keeping the consoles in the right
order again :)

> To me it seems we additionally still need to save the kernel command
> line position of the console too in struct kernel_cmdline so we can
> set the preferred_console for the deferred cases.

Then with the command line consoles in the right order, there's no need
to save the position separately.

And I think then we can also revert commit b73c9cbe4f1f ("printk: Flag
register_console() if console is set on command line"). But I need to
test the fixes some more before sending out.

Regards,

Tony