linux-kernel - [PATCH 0/2] Optionally allow ttynull to be selected as a default console

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Message-ID: <20241129041549.778959-1-bluescreen_avenger@verizon.net>
Date: Thu, 28 Nov 2024 23:15:47 -0500
From: n3rdopolis <bluescreen_avenger@...izon.net>
To: linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jiri Slaby <jirislaby@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: n3rdopolis <bluescreen_avenger@...izon.net>
Subject: [PATCH 0/2] Optionally allow ttynull to be selected as a default console

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

n3rdopolis (2):
  ttynull: Add an option to allow ttynull to be used as a console device
  tty: Change order of ttynull to be loaded sooner.

 drivers/tty/Kconfig   | 18 +++++++++++++++++-
 drivers/tty/Makefile  |  3 ++-
 drivers/tty/ttynull.c | 16 +++++++++++++++-
 3 files changed, 34 insertions(+), 3 deletions(-)

-- 
2.45.2