linux-kernel - Re: [PATCH 0/2] printk/console: Use ttynull when no console is available or wanted

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Date:   Fri, 20 Nov 2020 15:24:37 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Shreyas Joshi <shreyas.joshi@...mp.com>,
        shreyasjoshi15@...il.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] printk/console: Use ttynull when no console is
 available or wanted

On Wed 2020-11-11 14:54:48, Petr Mladek wrote:
> This is another attempt to solve regression caused by the commit
> 48021f98130880dd74 ("printk: handle blank console arguments passed in.").
> 
> It prevented a crash caused by empty console= parameter. But it caused
> performance problems on Chromebooks because they use it to disable
> all consoles, see
> see https://lore.kernel.org/r/20201006025935.GA597@jagdpanzerIV.localdomain
> 
> Solve both problems by using ttynull console driver that was crated
> exactly for this purpose.
> 
> The 1st patch should prevent the crash for any invalid console name.
> 
> The 2nd patch allows to used the ttynull driver also with the widely
> used console= and console=null parameters.
> 
> Best Regards,
> Petr
> 
> Petr Mladek (2):
>   init/console: Use ttynull as a fallback when there is no console
>   printk/console: Allow to disable console output by using console="" or
>     console=null

The patchset has been committed into printk/linux.git, branch
for-5.11-null-console.

Best Regards,
Petr