Re: [PATCH v8 0/4] Optionally allow ttynull to be selected as a default console

[Andy Shevchenko]

On Tue, Mar 11, 2025 at 5:31 AM <adamsimonelli@xxxxxxxxx> wrote:
>
> From: Adam Simonelli <adamsimonelli@xxxxxxxxx>
>
> When switching to a CONFIG_VT=n world, at least on x86 systems,
> /dev/console becomes /dev/ttyS0. This can cause some undesired effects.
> /dev/console's behavior is now tied to the physical /dev/ttyS0, which when
> disconnected can cause isatty() to fail when /dev/ttyS0 is disconnected,
> and users who upgrade to a theoretical vt-less kernel from their
> distribution who have a device such as a science instrument connected to
> their /dev/ttyS0 port will suddenly see it receive kernel log messages.
>
> When the new CONFIG_NULL_TTY_DEFAULT_CONSOLE option is turned on, this will
> allow the ttynull device to be leveraged as the default console. Distributions
> that had CONFIG_VT turned on before will be able to leverage this option
> to where /dev/console is still backed by a psuedo device, avoiding these

pseudo

> issues, without needing to enable the entire VT subsystem.

LGTM, so FWIW,
Acked-by: Andy Shevchenko <andy@xxxxxxxxxx>

-- 
With Best Regards,
Andy Shevchenko