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Hermes SMTP Server) with ESMTPA ID af1c0b40292d512b9d850181f2953147; Fri, 29 Nov 2024 04:15:58 +0000 (UTC) From: n3rdopolis To: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, Jiri Slaby , Greg Kroah-Hartman Cc: n3rdopolis Subject: [PATCH 1/2] ttynull: Add an option to allow ttynull to be used as a console device Date: Thu, 28 Nov 2024 23:15:48 -0500 Message-ID: <20241129041549.778959-2-bluescreen_avenger@verizon.net> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241129041549.778959-1-bluescreen_avenger@verizon.net> References: <20241129041549.778959-1-bluescreen_avenger@verizon.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a config option CONFIG_NULL_TTY_CONSOLE that will have ttynull be initialized by console_initcall() and selected as a possible console device. Signed-off-by: n3rdopolis --- drivers/tty/Kconfig | 18 +++++++++++++++++- drivers/tty/ttynull.c | 16 +++++++++++++++- 2 files changed, 32 insertions(+), 2 deletions(-) diff --git a/drivers/tty/Kconfig b/drivers/tty/Kconfig index 63a494d36a1f..afe4e7722d4c 100644 --- a/drivers/tty/Kconfig +++ b/drivers/tty/Kconfig @@ -383,7 +383,23 @@ config NULL_TTY available or desired. =20 In order to use this driver, you should redirect the console to this - TTY, or boot the kernel with console=3Dttynull. + TTY, boot the kernel with console=3Dttynull, or enable + CONFIG_NULL_TTY_CONSOLE. + + If unsure, say N. + +config NULL_TTY_CONSOLE + bool "Supports /dev/ttynull as a console automatically" + depends on NULL_TTY=3Dy && !VT_CONSOLE + help + Say Y here if you want the NULL TTY to be used as a /dev/console + device. + + This is useful for userspace applications that expect a working + console device, without changing the kernel boot options, such as a + distribuition or environment that historically had CONFIG_VT_CONSOLE + enabled, and have now disabled it, but still need /dev/console to be + working for userspace applications. =20 If unsure, say N. =20 diff --git a/drivers/tty/ttynull.c b/drivers/tty/ttynull.c index 6b2f7208b564..8ba629ae426b 100644 --- a/drivers/tty/ttynull.c +++ b/drivers/tty/ttynull.c @@ -57,6 +57,10 @@ static struct tty_driver *ttynull_device(struct console = *c, int *index) static struct console ttynull_console =3D { .name =3D "ttynull", .device =3D ttynull_device, +#ifdef CONFIG_NULL_TTY_CONSOLE + .index =3D -1, + .flags =3D CON_PRINTBUFFER, +#endif }; =20 static int __init ttynull_init(void) @@ -90,10 +94,20 @@ static int __init ttynull_init(void) } =20 ttynull_driver =3D driver; - register_console(&ttynull_console); + if (!console_is_registered(&ttynull_console)) + register_console(&ttynull_console); + + return 0; +} =20 +#ifdef CONFIG_NULL_TTY_CONSOLE +static int __init ttynull_register(void) +{ + register_console(&ttynull_console); return 0; } +console_initcall(ttynull_register); +#endif =20 static void __exit ttynull_exit(void) { --=20 2.45.2 From nobody Sat Feb 7 06:55:47 2026 Received: from sonic303-1.consmr.mail.bf2.yahoo.com (sonic303-1.consmr.mail.bf2.yahoo.com [74.6.131.40]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 23BDF1531D5 for ; Fri, 29 Nov 2024 04:46:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.6.131.40 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; 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Hermes SMTP Server) with ESMTPA ID af1c0b40292d512b9d850181f2953147; Fri, 29 Nov 2024 04:15:59 +0000 (UTC) From: n3rdopolis To: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, Jiri Slaby , Greg Kroah-Hartman Cc: n3rdopolis Subject: [PATCH 2/2] tty: Change order of ttynull to be loaded sooner. Date: Thu, 28 Nov 2024 23:15:49 -0500 Message-ID: <20241129041549.778959-3-bluescreen_avenger@verizon.net> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241129041549.778959-1-bluescreen_avenger@verizon.net> References: <20241129041549.778959-1-bluescreen_avenger@verizon.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" If CONFIG_NULL_TTY_CONSOLE is enabled, and CONFIG_VT is disabled, ttynull will become the default primary console device, based on the load order. Users and distributions that are migrating away from CONFIG_VT will benefit from this as /dev/console would not suddenly become /dev/ttyS0 which could otherwise cause some user space behavior changes, namely the TCGETS ioctl failing, which causes libc's isatty() to incorrectly return false when /dev/ttyS0 is disabled, and will prevent a device that is connected to a user's /dev/ttyS0 to suddenly start getting kernel log messages. Signed-off-by: n3rdopolis --- drivers/tty/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/tty/Makefile b/drivers/tty/Makefile index 07aca5184a55..03bb47e11e1c 100644 --- a/drivers/tty/Makefile +++ b/drivers/tty/Makefile @@ -11,6 +11,8 @@ obj-$(CONFIG_N_HDLC) +=3D n_hdlc.o obj-$(CONFIG_N_GSM) +=3D n_gsm.o =20 obj-y +=3D vt/ +obj-$(CONFIG_NULL_TTY) +=3D ttynull.o + obj-$(CONFIG_HVC_DRIVER) +=3D hvc/ obj-y +=3D serial/ obj-$(CONFIG_SERIAL_DEV_BUS) +=3D serdev/ @@ -20,7 +22,6 @@ obj-$(CONFIG_AMIGA_BUILTIN_SERIAL) +=3D amiserial.o obj-$(CONFIG_MOXA_INTELLIO) +=3D moxa.o obj-$(CONFIG_MOXA_SMARTIO) +=3D mxser.o obj-$(CONFIG_NOZOMI) +=3D nozomi.o -obj-$(CONFIG_NULL_TTY) +=3D ttynull.o obj-$(CONFIG_SYNCLINK_GT) +=3D synclink_gt.o obj-$(CONFIG_PPC_EPAPR_HV_BYTECHAN) +=3D ehv_bytechan.o obj-$(CONFIG_GOLDFISH_TTY) +=3D goldfish.o --=20 2.45.2