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Subject[PATCH] Add possibility to set /dev/tty number
Hello,

In Linux there is no way to set the number of tty devices or console
to create. By default the kernel create 64 /dev/tty devices. what is
too much for embedded system with limited resources. As all these 64
devices are not necessary or mandatory for the kernel proper working,
I add a config option to set the desired tty. The lowest number you
can set is 1 and the highest is 63, any value respectively below or
above that, will cause a kconfig invalid entry pop-up.

Please keep me update.

Best Regards
From 430deaf09da90bf0da03b7ca612cd4481ad30fea Mon Sep 17 00:00:00 2001
From: Pierre Paul MINGOT <mingot.pierre@gmail.com>
Date: Thu, 22 Jan 2015 17:51:49 +0100
Subject: [PATCH] In Linux there is no way to set the number of tty devices or
console to create. By default the kernel create 64 /dev/tty devices. what is
too much for embedded system with limited resources. As all these 64 devices
are not necessary or mandatory for the kernel proper working, I add a config
option to set the desired tty. The lowest number you can set is 1 and the
highest is 63, any value respectively below or above that, will cause a
kconfig invalid entry pop-up.

Signed-off-by: Pierre Paul MINGOT <mingot.pierre@gmail.com>
---
drivers/tty/Kconfig | 14 ++++++++++++++
include/uapi/linux/vt.h | 4 ++--
2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/Kconfig b/drivers/tty/Kconfig
index b24aa01..0ec58a2 100644
--- a/drivers/tty/Kconfig
+++ b/drivers/tty/Kconfig
@@ -75,6 +75,19 @@ config VT_CONSOLE_SLEEP
def_bool y
depends on VT_CONSOLE && PM_SLEEP

+config NR_TTY_DEVICES
+ int "Maximum tty device number"
+ depends on VT
+ range 1 63
+ default 1
+ ---help---
+ This is the highest numbered device created in /dev. You will actually have
+ NR_TTY_DEVICES+1 devices in /dev. The default is 63, which will result in
+ 64 /dev entries. The lowest number you can set is 1 and the highest is 63,
+ anything respectively below or above that, is not possible and will cause
+ a kconfig invalid entry pop-up.
+ So the default value will be set.
+
config HW_CONSOLE
bool
depends on VT && !UML
@@ -419,4 +432,5 @@ config DA_CONSOLE
help
This enables a console on a Dash channel.

+
endif # TTY
diff --git a/include/uapi/linux/vt.h b/include/uapi/linux/vt.h
index 978578b..2140496 100644
--- a/include/uapi/linux/vt.h
+++ b/include/uapi/linux/vt.h
@@ -7,8 +7,8 @@
* resizing).
*/
#define MIN_NR_CONSOLES 1 /* must be at least 1 */
-#define MAX_NR_CONSOLES 63 /* serial lines start at 64 */
-#define MAX_NR_USER_CONSOLES 63 /* must be root to allocate above this */
+/* serial lines start at 64 */
+#define MAX_NR_CONSOLES CONFIG_NR_TTY_DEVICES
+/* must be root to allocate above this */
+#define MAX_NR_USER_CONSOLES CONFIG_NR_TTY_DEVICES
/* Note: the ioctl VT_GETSTATE does not work for
consoles 16 and higher (since it returns a short) */

--
1.9.1
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