linux-kernel - Re: [PATCH] printk/console: Enable console kthreads only when there is no boot console left

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Message-ID: <20220629082956.GB3111@pathway.suse.cz>
Date:   Wed, 29 Jun 2022 10:29:56 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     John Ogness <john.ogness@...utronix.de>,
        Marek Behún <kabel@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Jan Kara <jack@...e.cz>, Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] printk/console: Enable console kthreads only when there
 is no boot console left

On Fri 2022-06-24 18:41:36, Steven Rostedt wrote:
> On Tue, 21 Jun 2022 00:57:09 +0206
> John Ogness <john.ogness@...utronix.de> wrote:
> 
> > Since early printing does not use the kernel driver model, I do not see
> > a clear solution at this point. But since using early printing is not a
> > typical use, I am OK with this patch.
> 
> Does this patch still work if you add the "keep" flag to the
> earlyprintk kernel parameter?

It works. If the boot console stays then the console kthreads will
never get enabled.

Well, I hope that we will be able to add the synchronization and remove
this constraint. I think that the port->lock should be usable in
most cases.

Best Regards,
Petr