tty: Added a CONFIG_TTY option to allow removal of TTY
The option allows you to remove TTY and compile without errors. This
saves space on systems that won't support TTY interfaces anyway.
bloat-o-meter output is below.
The bulk of this patch consists of Kconfig changes adding "depends on
TTY" to various serial devices and similar drivers that require the TTY
layer. Ideally, these dependencies would occur on a common intermediate
symbol such as SERIO, but most drivers "select SERIO" rather than
"depends on SERIO", and "select" does not respect dependencies.
bloat-o-meter output comparing our previous minimal to new minimal by
removing TTY. The list is filtered to not show removed entries with awk
'$3 != "-"' as the list was very long.
add/remove: 0/226 grow/shrink: 2/14 up/down: 6/-35356 (-35350)
function old new delta
chr_dev_init 166 170 +4
allow_signal 80 82 +2
static.__warned 143 142 -1
disallow_signal 63 62 -1
__set_special_pids 95 94 -1
unregister_console 126 121 -5
start_kernel 546 541 -5
register_console 593 588 -5
copy_from_user 45 40 -5
sys_setsid 128 120 -8
sys_vhangup 32 19 -13
do_exit 1543 1526 -17
bitmap_zero 60 40 -20
arch_local_irq_save 137 117 -20
release_task 674 652 -22
static.spin_unlock_irqrestore 308 260 -48
Signed-off-by: Joe Millenbach <jmillenbach@gmail.com>
Reviewed-by: Jamey Sharp <jamey@minilop.net>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/class/Kconfig b/drivers/usb/class/Kconfig
index 2519e32..316aac8 100644
--- a/drivers/usb/class/Kconfig
+++ b/drivers/usb/class/Kconfig
@@ -6,7 +6,7 @@
config USB_ACM
tristate "USB Modem (CDC ACM) support"
- depends on USB
+ depends on USB && TTY
---help---
This driver supports USB modems and ISDN adapters which support the
Communication Device Class Abstract Control Model interface.
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 14625fd..a1bd951 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -750,6 +750,7 @@
config USB_G_SERIAL
tristate "Serial Gadget (with CDC ACM and CDC OBEX support)"
+ depends on TTY
select USB_LIBCOMPOSITE
help
The Serial Gadget talks to the Linux-USB generic serial driver.
@@ -799,6 +800,8 @@
For more information, see Documentation/usb/gadget_printer.txt
which includes sample code for accessing the device file.
+if TTY
+
config USB_CDC_COMPOSITE
tristate "CDC Composite Device (Ethernet and ACM)"
depends on NET
@@ -879,6 +882,8 @@
If unsure, say "y".
+endif # TTY
+
config USB_G_HID
tristate "HID Gadget"
select USB_LIBCOMPOSITE
@@ -895,6 +900,7 @@
# Standalone / single function gadgets
config USB_G_DBGP
tristate "EHCI Debug Device Gadget"
+ depends on TTY
select USB_LIBCOMPOSITE
help
This gadget emulates an EHCI Debug device. This is useful when you want
diff --git a/drivers/usb/serial/Kconfig b/drivers/usb/serial/Kconfig
index 76f4622..d8e35fe 100644
--- a/drivers/usb/serial/Kconfig
+++ b/drivers/usb/serial/Kconfig
@@ -4,7 +4,7 @@
menuconfig USB_SERIAL
tristate "USB Serial Converter support"
- depends on USB
+ depends on USB && TTY
---help---
Say Y here if you have a USB device that provides normal serial
ports, or acts like a serial device, and you want to connect it to