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

Petr Mladek
2020-11-20T14:25:01Z

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