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>

55 files changed, 165 insertions, 47 deletions

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 9d5904cc7712..1ef196ddadeb 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -125,6 +125,7 @@ choice
 
 config ALPHA_GENERIC
         bool "Generic"
+        depends on TTY
         help
           A generic kernel will run on all supported Alpha hardware.
 
@@ -491,6 +492,7 @@ config VGA_HOSE
 
 config ALPHA_SRM
         bool "Use SRM as bootloader" if ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_NAUTILUS || ALPHA_NONAME
+        depends on TTY
         default y if ALPHA_JENSEN || ALPHA_MIKASA || ALPHA_SABLE || ALPHA_LYNX || ALPHA_NORITAKE || ALPHA_DP264 || ALPHA_RAWHIDE || ALPHA_EIGER || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL
         ---help---
           There are two different types of booting firmware on Alphas: SRM,
diff --git a/arch/ia64/hp/sim/Kconfig b/arch/ia64/hp/sim/Kconfig
index 8d513a8c5266..d84707d55203 100644
--- a/arch/ia64/hp/sim/Kconfig
+++ b/arch/ia64/hp/sim/Kconfig
@@ -8,6 +8,7 @@ config HP_SIMETH
 
 config HP_SIMSERIAL
         bool "Simulated serial driver support"
+        depends on TTY
 
 config HP_SIMSERIAL_CONSOLE
         bool "Console for HP simulator"
diff --git a/arch/m68k/Kconfig.devices b/arch/m68k/Kconfig.devices
index c4cdfe444c64..4bc945dfe467 100644
--- a/arch/m68k/Kconfig.devices
+++ b/arch/m68k/Kconfig.devices
@@ -41,7 +41,7 @@ config NFBLOCK
 
 config NFCON
         tristate "NatFeat console driver"
-        depends on NATFEAT
+        depends on TTY && NATFEAT
         help
           Say Y to include support for the ARAnyM NatFeat console driver
           which allows the console output to be redirected to the stderr
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index b77feffbadea..df5beb639760 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -23,6 +23,7 @@ config PARISC
         select HAVE_MOD_ARCH_SPECIFIC
         select MODULES_USE_ELF_RELA
         select CLONE_BACKWARDS
+        select TTY # Needed for pdc_cons.c
 
         help
           The PA-RISC microprocessor is designed by Hewlett-Packard and used
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 875d008828b8..ae8a7ca67fa4 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -121,6 +121,7 @@ config DEBUG_COPY_FROM_USER
         def_bool n
 
 config HVC_TILE
+        depends on TTY
         select HVC_DRIVER
         def_bool y
 
diff --git a/arch/um/Kconfig.common b/arch/um/Kconfig.common
index 648121b037d5..bceee6623b00 100644
--- a/arch/um/Kconfig.common
+++ b/arch/um/Kconfig.common
@@ -12,6 +12,7 @@ config UML
         select GENERIC_CPU_DEVICES
         select GENERIC_IO
         select GENERIC_CLOCKEVENTS
+        select TTY # Needed for line.c
 
 config MMU
         bool
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 5aab1acabf1c..ad64c73b8675 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -132,6 +132,7 @@ choice
 
 config XTENSA_PLATFORM_ISS
         bool "ISS"
+        depends on TTY
         select XTENSA_CALIBRATE_CCOUNT
         select SERIAL_CONSOLE
         select XTENSA_ISS_NETWORK
diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index e9f203eadb1f..fdfd61a2d523 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -26,6 +26,7 @@ config BT_HCIBTSDIO
 
 config BT_HCIUART
         tristate "HCI UART driver"
+        depends on TTY
         help
           Bluetooth HCI UART driver.
           This driver is required if you want to use Bluetooth devices with
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 72bedad6bf8c..3bb6fa3930be 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -53,7 +53,7 @@ source "drivers/tty/serial/Kconfig"
 
 config TTY_PRINTK
         bool "TTY driver to output user messages via printk"
-        depends on EXPERT
+        depends on EXPERT && TTY
         default n
         ---help---
           If you say Y here, the support for writing user messages (i.e.
@@ -159,7 +159,7 @@ source "drivers/tty/hvc/Kconfig"
 
 config VIRTIO_CONSOLE
         tristate "Virtio console"
-        depends on VIRTIO
+        depends on VIRTIO && TTY
         select HVC_DRIVER
         help
           Virtio console for use with lguest and other hypervisors.
@@ -392,6 +392,7 @@ config XILINX_HWICAP
 
 config R3964
         tristate "Siemens R3964 line discipline"
+        depends on TTY
         ---help---
           This driver allows synchronous communication with devices using the
           Siemens R3964 packet protocol. Unless you are dealing with special
@@ -439,7 +440,7 @@ source "drivers/char/pcmcia/Kconfig"
 
 config MWAVE
         tristate "ACP Modem (Mwave) support"
-        depends on X86
+        depends on X86 && TTY
         select SERIAL_8250
         ---help---
           The ACP modem (Mwave) for Linux is a WinModem. It is composed of a
diff --git a/drivers/char/pcmcia/Kconfig b/drivers/char/pcmcia/Kconfig
index 6614416a8623..2a166d56738a 100644
--- a/drivers/char/pcmcia/Kconfig
+++ b/drivers/char/pcmcia/Kconfig
@@ -7,7 +7,7 @@ menu "PCMCIA character devices"
 
 config SYNCLINK_CS
         tristate "SyncLink PC Card support"
-        depends on PCMCIA
+        depends on PCMCIA && TTY
         help
           Enable support for the SyncLink PC Card serial adapter, running
           asynchronous and HDLC communications up to 512Kbps. The port is
@@ -45,7 +45,7 @@ config CARDMAN_4040
 
 config IPWIRELESS
         tristate "IPWireless 3G UMTS PCMCIA card support"
-        depends on PCMCIA && NETDEVICES
+        depends on PCMCIA && NETDEVICES && TTY
         select PPP
         help
           This is a driver for 3G UMTS PCMCIA card from IPWireless company. In
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index bdca5111eb9d..cf474b2df4ae 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -803,7 +803,7 @@ config I2C_PARPORT_LIGHT
 
 config I2C_TAOS_EVM
         tristate "TAOS evaluation module"
-        depends on EXPERIMENTAL
+        depends on EXPERIMENTAL && TTY
         select SERIO
         select SERIO_SERPORT
         default n
diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig
index 56eb471b5576..055bcaba774c 100644
--- a/drivers/input/joystick/Kconfig
+++ b/drivers/input/joystick/Kconfig
@@ -132,6 +132,8 @@ config JOYSTICK_TMDC
 
 source "drivers/input/joystick/iforce/Kconfig"
 
+if TTY
+
 config JOYSTICK_WARRIOR
         tristate "Logitech WingMan Warrior joystick"
         select SERIO
@@ -205,6 +207,8 @@ config JOYSTICK_ZHENHUA
           To compile this driver as a module, choose M here: the
           module will be called zhenhua.
 
+endif # TTY
+
 config JOYSTICK_DB9
         tristate "Multisystem, Sega Genesis, Saturn joysticks and gamepads"
         depends on PARPORT
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 5a240c60342d..008f96aaf19e 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -69,6 +69,7 @@ config KEYBOARD_ATARI
 config KEYBOARD_ATKBD
         tristate "AT keyboard" if EXPERT || !X86
         default y
+        depends on TTY
         select SERIO
         select SERIO_LIBPS2
         select SERIO_I8042 if X86
@@ -153,6 +154,7 @@ config KEYBOARD_BFIN
 
 config KEYBOARD_LKKBD
         tristate "DECstation/VAXstation LK201/LK401 keyboard"
+        depends on TTY
         select SERIO
         help
           Say Y here if you want to use a LK201 or LK401 style serial
@@ -268,7 +270,7 @@ config KEYBOARD_HIL_OLD
 
 config KEYBOARD_HIL
         tristate "HP HIL keyboard/pointer support"
-        depends on GSC || HP300
+        depends on (GSC || HP300) && TTY
         default y
         select HP_SDC
         select HIL_MLC
@@ -400,6 +402,7 @@ config KEYBOARD_IMX
 
 config KEYBOARD_NEWTON
         tristate "Newton keyboard"
+        depends on TTY
         select SERIO
         help
           Say Y here if you have a Newton keyboard on a serial port.
@@ -479,6 +482,8 @@ config KEYBOARD_SAMSUNG
           To compile this driver as a module, choose M here: the
           module will be called samsung-keypad.
 
+if TTY
+
 config KEYBOARD_STOWAWAY
         tristate "Stowaway keyboard"
         select SERIO
@@ -501,6 +506,8 @@ config KEYBOARD_SUNKBD
           To compile this driver as a module, choose M here: the
           module will be called sunkbd.
 
+endif # TTY
+
 config KEYBOARD_SH_KEYSC
         tristate "SuperH KEYSC keypad support"
         depends on SUPERH || ARCH_SHMOBILE
@@ -597,6 +604,7 @@ config KEYBOARD_TWL4030
 
 config KEYBOARD_XTKBD
         tristate "XT keyboard"
+        depends on TTY
         select SERIO
         help
           Say Y here if you want to use the old IBM PC/XT keyboard (or
diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
index cd6268cf7cd5..fc160f72dc4e 100644
--- a/drivers/input/mouse/Kconfig
+++ b/drivers/input/mouse/Kconfig
@@ -14,6 +14,7 @@ if INPUT_MOUSE
 
 config MOUSE_PS2
         tristate "PS/2 mouse"
+        depends on TTY
         default y
         select SERIO
         select SERIO_LIBPS2
@@ -138,6 +139,7 @@ config MOUSE_PS2_OLPC
 
 config MOUSE_SERIAL
         tristate "Serial mouse"
+        depends on TTY
         select SERIO
         help
           Say Y here if you have a serial (RS-232, COM port) mouse connected
@@ -262,6 +264,7 @@ config MOUSE_RISCPC
 
 config MOUSE_VSXXXAA
         tristate "DEC VSXXX-AA/GA mouse and VSXXX-AB tablet"
+        depends on TTY
         select SERIO
         help
           Say Y (or M) if you want to use a DEC VSXXX-AA (hockey
diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
index 4a4e182c33e7..81ee7551148e 100644
--- a/drivers/input/serio/Kconfig
+++ b/drivers/input/serio/Kconfig
@@ -4,6 +4,7 @@
 config SERIO
         tristate "Serial I/O support" if EXPERT || !X86
         default y
+        depends on TTY
         help
           Say Yes here if you have any input device that uses serial I/O to
           communicate with the system. This includes the
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 515cfe790543..3d6f548dd3d4 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -192,6 +192,8 @@ config TOUCHSCREEN_DA9052
           To compile this driver as a module, choose M here: the
           module will be called da9052_tsi.
 
+if TTY
+
 config TOUCHSCREEN_DYNAPRO
         tristate "Dynapro serial touchscreen"
         select SERIO
@@ -216,6 +218,8 @@ config TOUCHSCREEN_HAMPSHIRE
           To compile this driver as a module, choose M here: the
           module will be called hampshire.
 
+endif # TTY
+
 config TOUCHSCREEN_EETI
         tristate "EETI touchscreen panel support"
         depends on I2C
@@ -237,6 +241,7 @@ config TOUCHSCREEN_EGALAX
 
 config TOUCHSCREEN_FUJITSU
         tristate "Fujitsu serial touchscreen"
+        depends on TTY
         select SERIO
         help
           Say Y here if you have the Fujitsu touchscreen (such as one
@@ -275,6 +280,8 @@ config TOUCHSCREEN_S3C2410
           To compile this driver as a module, choose M here: the
           module will be called s3c2410_ts.
 
+if TTY
+
 config TOUCHSCREEN_GUNZE
         tristate "Gunze AHL-51S touchscreen"
         select SERIO
@@ -311,6 +318,8 @@ config TOUCHSCREEN_WACOM_W8001
           To compile this driver as a module, choose M here: the
           module will be called wacom_w8001.
 
+endif # TTY
+
 config TOUCHSCREEN_WACOM_I2C
         tristate "Wacom Tablet support (I2C)"
         depends on I2C
@@ -369,6 +378,8 @@ config TOUCHSCREEN_MMS114
           To compile this driver as a module, choose M here: the
           module will be called mms114.
 
+if TTY
+
 config TOUCHSCREEN_MTOUCH
         tristate "MicroTouch serial touchscreens"
         select SERIO
@@ -393,6 +404,8 @@ config TOUCHSCREEN_INEXIO
           To compile this driver as a module, choose M here: the
           module will be called inexio.
 
+endif # TTY
+
 config TOUCHSCREEN_INTEL_MID
         tristate "Intel MID platform resistive touchscreen"
         depends on INTEL_SCU_IPC
@@ -450,6 +463,7 @@ config TOUCHSCREEN_HTCPEN
 
 config TOUCHSCREEN_PENMOUNT
         tristate "Penmount serial touchscreen"
+        depends on TTY
         select SERIO
         help
           Say Y here if you have a Penmount serial touchscreen connected to
@@ -493,6 +507,8 @@ config TOUCHSCREEN_TNETV107X
           To compile this driver as a module, choose M here: the
           module will be called tnetv107x-ts.
 
+if TTY
+
 config TOUCHSCREEN_TOUCHRIGHT
         tristate "Touchright serial touchscreen"
         select SERIO
@@ -517,6 +533,8 @@ config TOUCHSCREEN_TOUCHWIN
           To compile this driver as a module, choose M here: the
           module will be called touchwin.
 
+endif # TTY
+
 config TOUCHSCREEN_TI_AM335X_TSC
         tristate "TI Touchscreen Interface"
         depends on MFD_TI_AM335X_TSCADC
@@ -790,6 +808,8 @@ config TOUCHSCREEN_USB_EASYTOUCH
           Say Y here if you have an EasyTouch USB Touch controller.
           If unsure, say N.
 
+if TTY
+
 config TOUCHSCREEN_TOUCHIT213
         tristate "Sahara TouchIT-213 touchscreen"
         select SERIO
@@ -813,6 +833,8 @@ config TOUCHSCREEN_TSC_SERIO
           To compile this driver as a module, choose M here: the
           module will be called tsc40.
 
+endif # TTY
+
 config TOUCHSCREEN_TSC2005
         tristate "TSC2005 based touchscreens"
         depends on SPI_MASTER && GENERIC_HARDIRQS
diff --git a/drivers/ipack/devices/Kconfig b/drivers/ipack/devices/Kconfig
index 0b82fdc198c0..907a8cb48f2a 100644
--- a/drivers/ipack/devices/Kconfig
+++ b/drivers/ipack/devices/Kconfig
@@ -1,6 +1,6 @@
 config SERIAL_IPOCTAL
         tristate "IndustryPack IP-OCTAL uart support"
-        depends on IPACK_BUS
+        depends on IPACK_BUS && TTY
         help
           This driver supports the IPOCTAL serial port device for the IndustryPack bus.
         default n
diff --git a/drivers/isdn/Kconfig b/drivers/isdn/Kconfig
index 86cd75a0e84d..ef661acdda17 100644
--- a/drivers/isdn/Kconfig
+++ b/drivers/isdn/Kconfig
@@ -22,6 +22,7 @@ if ISDN
 
 menuconfig ISDN_I4L
         tristate "Old ISDN4Linux (deprecated)"
+        depends on TTY
         ---help---
           This driver allows you to use an ISDN adapter for networking
           connections and as dialin/out device.  The isdn-tty's have a built
diff --git a/drivers/isdn/capi/Kconfig b/drivers/isdn/capi/Kconfig
index 15c3ffd9d860..f04686580040 100644
--- a/drivers/isdn/capi/Kconfig
+++ b/drivers/isdn/capi/Kconfig
@@ -18,6 +18,7 @@ config CAPI_TRACE
 
 config ISDN_CAPI_MIDDLEWARE
         bool "CAPI2.0 Middleware support"
+        depends on TTY
         help
           This option will enhance the capabilities of the /dev/capi20
           interface.  It will provide a means of moving a data connection,
diff --git a/drivers/isdn/gigaset/Kconfig b/drivers/isdn/gigaset/Kconfig
index b18a92c32184..dde5e09e6267 100644
--- a/drivers/isdn/gigaset/Kconfig
+++ b/drivers/isdn/gigaset/Kconfig
@@ -1,5 +1,6 @@
 menuconfig ISDN_DRV_GIGASET
         tristate "Siemens Gigaset support"
+        depends on TTY
         select CRC_CCITT
         select BITREVERSE
         help
diff --git a/drivers/isdn/hardware/mISDN/Kconfig b/drivers/isdn/hardware/mISDN/Kconfig
index eadc1cd34a20..b8611e3e5e74 100644
--- a/drivers/isdn/hardware/mISDN/Kconfig
+++ b/drivers/isdn/hardware/mISDN/Kconfig
@@ -76,6 +76,7 @@ config MISDN_NETJET
         tristate "Support for NETJet cards"
         depends on MISDN
         depends on PCI
+        depends on TTY
         select MISDN_IPAC
         select ISDN_HDLC
         select ISDN_I4L
diff --git a/drivers/lguest/Kconfig b/drivers/lguest/Kconfig
index 34ae49dc557c..f9c43145a611 100644
--- a/drivers/lguest/Kconfig
+++ b/drivers/lguest/Kconfig
@@ -1,6 +1,6 @@
 config LGUEST
         tristate "Linux hypervisor example code"
-        depends on X86_32 && EXPERIMENTAL && EVENTFD
+        depends on X86_32 && EXPERIMENTAL && EVENTFD && TTY
         select HVC_DRIVER
         ---help---
           This is a very simple module which allows you to run
diff --git a/drivers/media/radio/wl128x/Kconfig b/drivers/media/radio/wl128x/Kconfig
index ea1e6545df36..f359be7e9dd9 100644
--- a/drivers/media/radio/wl128x/Kconfig
+++ b/drivers/media/radio/wl128x/Kconfig
@@ -4,7 +4,7 @@
 menu "Texas Instruments WL128x FM driver (ST based)"
 config RADIO_WL128X
         tristate "Texas Instruments WL128x FM Radio"
-        depends on VIDEO_V4L2 && RFKILL && GPIOLIB
+        depends on VIDEO_V4L2 && RFKILL && GPIOLIB && TTY
         select TI_ST if NET
         help
         Choose Y here if you have this FM radio chip.
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index b151b7c1bd59..4b2bb939dde1 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -127,7 +127,7 @@ config PHANTOM
 
 config INTEL_MID_PTI
         tristate "Parallel Trace Interface for MIPI P1149.7 cJTAG standard"
-        depends on PCI
+        depends on PCI && TTY
         default n
         help
           The PTI (Parallel Trace Interface) driver directs
diff --git a/drivers/misc/ti-st/Kconfig b/drivers/misc/ti-st/Kconfig
index abb5de1afce3..f34dcc514730 100644
--- a/drivers/misc/ti-st/Kconfig
+++ b/drivers/misc/ti-st/Kconfig
@@ -5,7 +5,7 @@
 menu "Texas Instruments shared transport line discipline"
 config TI_ST
         tristate "Shared transport core driver"
-        depends on NET && GPIOLIB
+        depends on NET && GPIOLIB && TTY
         select FW_LOADER
         help
           This enables the shared transport core driver for TI
diff --git a/drivers/mmc/card/Kconfig b/drivers/mmc/card/Kconfig
index 3b1f783bf924..5562308699bc 100644
--- a/drivers/mmc/card/Kconfig
+++ b/drivers/mmc/card/Kconfig
@@ -52,6 +52,7 @@ config MMC_BLOCK_BOUNCE
 
 config SDIO_UART
         tristate "SDIO UART/GPS class support"
+        depends on TTY
         help
           SDIO function driver for SDIO cards that implements the UART
           class, as well as the GPS class which appears like a UART.
diff --git a/drivers/net/caif/Kconfig b/drivers/net/caif/Kconfig
index abf4d7a9dcce..60c2142373c9 100644
--- a/drivers/net/caif/Kconfig
+++ b/drivers/net/caif/Kconfig
@@ -6,7 +6,7 @@ comment "CAIF transport drivers"
 
 config CAIF_TTY
         tristate "CAIF TTY transport driver"
-        depends on CAIF
+        depends on CAIF && TTY
         default n
         ---help---
         The CAIF TTY transport driver is a Line Discipline (ldisc)
diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
index b56bd9e80957..72df3a306a08 100644
--- a/drivers/net/can/Kconfig
+++ b/drivers/net/can/Kconfig
@@ -13,7 +13,7 @@ config CAN_VCAN
 
 config CAN_SLCAN
         tristate "Serial / USB serial CAN Adaptors (slcan)"
-        depends on CAN
+        depends on CAN && TTY
         ---help---
           CAN driver for several 'low cost' CAN interfaces that are attached
           via serial lines or via USB-to-serial adapters using the LAWICEL
diff --git a/drivers/net/hamradio/Kconfig b/drivers/net/hamradio/Kconfig
index 95dbcfdf131d..bf5e59687680 100644
--- a/drivers/net/hamradio/Kconfig
+++ b/drivers/net/hamradio/Kconfig
@@ -1,6 +1,6 @@
 config MKISS
         tristate "Serial port KISS driver"
-        depends on AX25
+        depends on AX25 && TTY
         select CRC16
         ---help---
           KISS is a protocol used for the exchange of data between a computer
@@ -18,7 +18,7 @@ config MKISS
 
 config 6PACK
         tristate "Serial port 6PACK driver"
-        depends on AX25
+        depends on AX25 && TTY
         ---help---
           6pack is a transmission protocol for the data exchange between your
           PC and your TNC (the Terminal Node Controller acts as a kind of
diff --git a/drivers/net/irda/Kconfig b/drivers/net/irda/Kconfig
index 595205406d73..e1454cdec14b 100644
--- a/drivers/net/irda/Kconfig
+++ b/drivers/net/irda/Kconfig
@@ -5,7 +5,7 @@ comment "SIR device drivers"
 
 config IRTTY_SIR
         tristate "IrTTY (uses Linux serial driver)"
-        depends on IRDA
+        depends on IRDA && TTY
         help
           Say Y here if you want to build support for the IrTTY line
           discipline.  To compile it as a module, choose M here: the module
diff --git a/drivers/net/ppp/Kconfig b/drivers/net/ppp/Kconfig
index 872df3ef07a6..3d9ef4f1e600 100644
--- a/drivers/net/ppp/Kconfig
+++ b/drivers/net/ppp/Kconfig
@@ -147,6 +147,7 @@ config PPPOL2TP
           Support for PPP-over-L2TP socket family. L2TP is a protocol
           used by ISPs and enterprises to tunnel PPP traffic over UDP
           tunnels. L2TP is replacing PPTP for VPN uses.
+if TTY
 
 config PPP_ASYNC
         tristate "PPP support for async serial ports"
@@ -172,4 +173,6 @@ config PPP_SYNC_TTY
 
           To compile this driver as a module, choose M here.
 
+endif # TTY
+
 endif # PPP
diff --git a/drivers/net/slip/Kconfig b/drivers/net/slip/Kconfig
index 211b160e4e9c..48e68714eef3 100644
--- a/drivers/net/slip/Kconfig
+++ b/drivers/net/slip/Kconfig
@@ -4,6 +4,7 @@
 
 config SLIP
         tristate "SLIP (serial line) support"
+        depends on TTY
         ---help---
           Say Y if you intend to use SLIP or CSLIP (compressed SLIP) to
           connect to your Internet service provider or to connect to some
diff --git a/drivers/net/usb/Kconfig b/drivers/net/usb/Kconfig
index ef976215b649..bd33153261ce 100644
--- a/drivers/net/usb/Kconfig
+++ b/drivers/net/usb/Kconfig
@@ -445,7 +445,7 @@ config USB_NET_QMI_WWAN
 
 config USB_HSO
         tristate "Option USB High Speed Mobile Devices"
-        depends on USB && RFKILL
+        depends on USB && RFKILL && TTY
         default n
         help
           Choose this option if you have an Option HSDPA/HSUPA card.
@@ -493,7 +493,7 @@ config USB_SIERRA_NET
 
 config USB_VL600
         tristate "LG VL600 modem dongle"
-        depends on USB_NET_CDCETHER
+        depends on USB_NET_CDCETHER && TTY
         select USB_ACM
         help
           Select this if you want to use an LG Electronics 4G/LTE usb modem
diff --git a/drivers/net/wan/Kconfig b/drivers/net/wan/Kconfig
index d58431e99f73..61eb8994b34f 100644
--- a/drivers/net/wan/Kconfig
+++ b/drivers/net/wan/Kconfig
@@ -429,7 +429,7 @@ config LAPBETHER
 
 config X25_ASY
         tristate "X.25 async driver (EXPERIMENTAL)"
-        depends on LAPB && X25
+        depends on LAPB && X25 && TTY
         ---help---
           Send and receive X.25 frames over regular asynchronous serial
           lines such as telephone lines equipped with ordinary modems.
diff --git a/drivers/pps/clients/Kconfig b/drivers/pps/clients/Kconfig
index 445197d4a8c4..6efd9b60d8ff 100644
--- a/drivers/pps/clients/Kconfig
+++ b/drivers/pps/clients/Kconfig
@@ -17,7 +17,7 @@ config PPS_CLIENT_KTIMER
 
 config PPS_CLIENT_LDISC
         tristate "PPS line discipline"
-        depends on PPS
+        depends on PPS && TTY
         help
           If you say yes here you get support for a PPS source connected
           with the CD (Carrier Detect) pin of your serial port.
diff --git a/drivers/s390/char/Kconfig b/drivers/s390/char/Kconfig
index 2c9a776bd63c..71bf959732fe 100644
--- a/drivers/s390/char/Kconfig
+++ b/drivers/s390/char/Kconfig
@@ -11,7 +11,7 @@ config TN3270
 config TN3270_TTY
         def_tristate y
         prompt "Support for tty input/output on 3270 terminals"
-        depends on TN3270
+        depends on TN3270 && TTY
         help
           Include support for using an IBM 3270 terminal as a Linux tty.
 
@@ -33,7 +33,7 @@ config TN3270_CONSOLE
 config TN3215
         def_bool y
         prompt "Support for 3215 line mode terminal"
-        depends on CCW
+        depends on CCW && TTY
         help
           Include support for IBM 3215 line-mode terminals.
 
@@ -51,7 +51,7 @@ config CCW_CONSOLE
 config SCLP_TTY
         def_bool y
         prompt "Support for SCLP line mode terminal"
-        depends on S390
+        depends on S390 && TTY
         help
           Include support for IBM SCLP line-mode terminals.
 
@@ -66,7 +66,7 @@ config SCLP_CONSOLE
 config SCLP_VT220_TTY
         def_bool y
         prompt "Support for SCLP VT220-compatible terminal"
-        depends on S390
+        depends on S390 && TTY
         help
           Include support for an IBM SCLP VT220-compatible terminal.
 
diff --git a/drivers/staging/ccg/Kconfig b/drivers/staging/ccg/Kconfig
index 8997a8c757aa..7ed5bc6caadb 100644
--- a/drivers/staging/ccg/Kconfig
+++ b/drivers/staging/ccg/Kconfig
@@ -2,7 +2,7 @@ if USB_GADGET
 
 config USB_G_CCG
         tristate "Configurable Composite Gadget (STAGING)"
-        depends on STAGING && BLOCK && NET && !USB_ZERO && !USB_ZERO_HNPTEST && !USB_AUDIO && !GADGET_UAC1 && !USB_ETH && !USB_ETH_RNDIS && !USB_ETH_EEM && !USB_G_NCM && !USB_GADGETFS && !USB_FUNCTIONFS && !USB_FUNCTIONFS_ETH && !USB_FUNCTIONFS_RNDIS && !USB_FUNCTIONFS_GENERIC && !USB_FILE_STORAGE && !USB_FILE_STORAGE_TEST && !USB_MASS_STORAGE && !USB_G_SERIAL && !USB_MIDI_GADGET && !USB_G_PRINTER && !USB_CDC_COMPOSITE && !USB_G_NOKIA && !USB_G_ACM_MS && !USB_G_MULTI && !USB_G_MULTI_RNDIS && !USB_G_MULTI_CDC && !USB_G_HID && !USB_G_DBGP && !USB_G_WEBCAM
+        depends on STAGING && BLOCK && NET && !USB_ZERO && !USB_ZERO_HNPTEST && !USB_AUDIO && !GADGET_UAC1 && !USB_ETH && !USB_ETH_RNDIS && !USB_ETH_EEM && !USB_G_NCM && !USB_GADGETFS && !USB_FUNCTIONFS && !USB_FUNCTIONFS_ETH && !USB_FUNCTIONFS_RNDIS && !USB_FUNCTIONFS_GENERIC && !USB_FILE_STORAGE && !USB_FILE_STORAGE_TEST && !USB_MASS_STORAGE && !USB_G_SERIAL && !USB_MIDI_GADGET && !USB_G_PRINTER && !USB_CDC_COMPOSITE && !USB_G_NOKIA && !USB_G_ACM_MS && !USB_G_MULTI && !USB_G_MULTI_RNDIS && !USB_G_MULTI_CDC && !USB_G_HID && !USB_G_DBGP && !USB_G_WEBCAM && TTY
         help
           The Configurable Composite Gadget supports multiple USB
           functions: acm, mass storage, rndis and FunctionFS.
diff --git a/drivers/staging/dgrp/Kconfig b/drivers/staging/dgrp/Kconfig
index 39f4bb65ec83..e4c41552923a 100644
--- a/drivers/staging/dgrp/Kconfig
+++ b/drivers/staging/dgrp/Kconfig
@@ -1,7 +1,7 @@
 config DGRP
        tristate "Digi Realport driver"
        default n
-       depends on SYSFS
+       depends on SYSFS && TTY
        ---help---
        Support for Digi Realport devices.  These devices allow you to
        access remote serial ports as if they are local tty devices.  This
diff --git a/drivers/staging/fwserial/Kconfig b/drivers/staging/fwserial/Kconfig
index 580406cb1808..9cdb3cdc4b66 100644
--- a/drivers/staging/fwserial/Kconfig
+++ b/drivers/staging/fwserial/Kconfig
@@ -1,6 +1,6 @@
 config FIREWIRE_SERIAL
        tristate "TTY over Firewire"
-       depends on FIREWIRE
+       depends on FIREWIRE && TTY
        help
           This enables TTY over IEEE 1394, providing high-speed serial
           connectivity to cabled peers.
diff --git a/drivers/staging/sb105x/Kconfig b/drivers/staging/sb105x/Kconfig
index 3d0d0eb95b8c..6a2e1b78e844 100644
--- a/drivers/staging/sb105x/Kconfig
+++ b/drivers/staging/sb105x/Kconfig
@@ -1,7 +1,7 @@
 config SB105X
         tristate "SystemBase PCI Multiport UART"
         select SERIAL_CORE
-        depends on PCI && BROKEN
+        depends on PCI && TTY && BROKEN
         help
           A driver for the SystemBase Multi-2/PCI serial card
 
diff --git a/drivers/tty/Kconfig b/drivers/tty/Kconfig
index 0ecf22b6a38e..a79fd8ebd56e 100644
--- a/drivers/tty/Kconfig
+++ b/drivers/tty/Kconfig
@@ -1,3 +1,14 @@
+config TTY
+        bool "Enable TTY" if EXPERT
+        default y
+        ---help---
+          Allows you to remove TTY support which can save space, and
+          blocks features that require TTY from inclusion in the kernel.
+          TTY is required for any text terminals or serial port
+          communication. Most users should leave this enabled.
+
+if TTY
+
 config VT
         bool "Virtual terminal" if EXPERT
         depends on !S390 && !UML
@@ -388,3 +399,5 @@ config PPC_EARLY_DEBUG_EHV_BC_HANDLE
           If the number you specify is not a valid byte channel handle, then
           there simply will be no early console output.  This is true also
           if you don't boot under a hypervisor at all.
+
+endif # TTY
diff --git a/drivers/tty/Makefile b/drivers/tty/Makefile
index 2953059530e4..df5663d0d55e 100644
--- a/drivers/tty/Makefile
+++ b/drivers/tty/Makefile
@@ -1,4 +1,4 @@
-obj-y                           += tty_io.o n_tty.o tty_ioctl.o tty_ldisc.o \
+obj-$(CONFIG_TTY)               += tty_io.o n_tty.o tty_ioctl.o tty_ldisc.o \
                                    tty_buffer.o tty_port.o tty_mutex.o
 obj-$(CONFIG_LEGACY_PTYS)       += pty.o
 obj-$(CONFIG_UNIX98_PTYS)       += pty.o
diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig
index f47b734c6a7a..8902f9b4df71 100644
--- a/drivers/tty/hvc/Kconfig
+++ b/drivers/tty/hvc/Kconfig
@@ -1,3 +1,5 @@
+if TTY
+
 config HVC_DRIVER
         bool
         help
@@ -119,3 +121,4 @@ config HVCS
           which will also be compiled when this driver is built as a
           module.
 
+endif # TTY
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 2dc429357fe3..e9aeccdfbe35 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -2,6 +2,8 @@
 # Serial device configuration
 #
 
+if TTY
+
 menu "Serial drivers"
         depends on HAS_IOMEM
 
@@ -1483,3 +1485,5 @@ config SERIAL_RP2_NR_UARTS
           need to be increased.
 
 endmenu
+
+endif # TTY
diff --git a/drivers/usb/class/Kconfig b/drivers/usb/class/Kconfig
index 2519e320098f..316aac8e4ca1 100644
--- a/drivers/usb/class/Kconfig
+++ b/drivers/usb/class/Kconfig
@@ -6,7 +6,7 @@ comment "USB Device Class drivers"
 
 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 14625fd2cecd..a1bd951f9cb7 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -750,6 +750,7 @@ config USB_GADGET_TARGET
 
 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 @@ config USB_G_PRINTER
           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 @@ config USB_G_MULTI_CDC
 
           If unsure, say "y".
 
+endif # TTY
+
 config USB_G_HID
         tristate "HID Gadget"
         select USB_LIBCOMPOSITE
@@ -895,6 +900,7 @@ config USB_G_HID
 # 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 76f462241738..d8e35fe30b0c 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
diff --git a/fs/proc/Makefile b/fs/proc/Makefile
index 981b05601931..712f24db9600 100644
--- a/fs/proc/Makefile
+++ b/fs/proc/Makefile
@@ -8,7 +8,8 @@ proc-y			:= nommu.o task_nommu.o
 proc-$(CONFIG_MMU)      := mmu.o task_mmu.o
 
 proc-y       += inode.o root.o base.o generic.o array.o \
-                proc_tty.o fd.o
+                fd.o
+proc-$(CONFIG_TTY)      += proc_tty.o
 proc-y  += cmdline.o
 proc-y  += consoles.o
 proc-y  += cpuinfo.o
diff --git a/include/linux/console.h b/include/linux/console.h
index dedb082fe50f..3b709da1786e 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -157,7 +157,12 @@ extern int is_console_locked(void);
 extern int braille_register_console(struct console *, int index,
                 char *console_options, char *braille_options);
 extern int braille_unregister_console(struct console *);
+#ifdef CONFIG_TTY
 extern void console_sysfs_notify(void);
+#else
+static inline void console_sysfs_notify(void)
+{ }
+#endif
 extern bool console_suspend_enabled;
 
 /* Suspend and resume console messages over PM events */
diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
index 32676b35d2f5..3c22538aab66 100644
--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -127,7 +127,12 @@ extern void pid_ns_release_proc(struct pid_namespace *ns);
  * proc_tty.c
  */
 struct tty_driver;
+#ifdef CONFIG_TTY
 extern void proc_tty_init(void);
+#else
+static inline void proc_tty_init(void)
+{ }
+#endif
 extern void proc_tty_register_driver(struct tty_driver *driver);
 extern void proc_tty_unregister_driver(struct tty_driver *driver);
 
diff --git a/include/linux/tty.h b/include/linux/tty.h
index f89acd1ed6d3..c75d886b0307 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -318,11 +318,43 @@ struct tty_file_private {
 
 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
 
+#ifdef CONFIG_TTY
+extern void console_init(void);
+extern void tty_kref_put(struct tty_struct *tty);
+extern struct pid *tty_get_pgrp(struct tty_struct *tty);
+extern void tty_vhangup_self(void);
+extern void disassociate_ctty(int priv);
+extern dev_t tty_devnum(struct tty_struct *tty);
+extern void proc_clear_tty(struct task_struct *p);
+extern struct tty_struct *get_current_tty(void);
+/* tty_io.c */
+extern int __init tty_init(void);
+#else
+static inline void console_init(void)
+{ }
+static inline void tty_kref_put(struct tty_struct *tty)
+{ }
+static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
+{ return NULL; }
+static inline void tty_vhangup_self(void)
+{ }
+static inline void disassociate_ctty(int priv)
+{ }
+static inline dev_t tty_devnum(struct tty_struct *tty)
+{ return 0; }
+static inline void proc_clear_tty(struct task_struct *p)
+{ }
+static inline struct tty_struct *get_current_tty(void)
+{ return NULL; }
+/* tty_io.c */
+static inline int __init tty_init(void)
+{ return 0; }
+#endif
+
 extern void tty_write_flush(struct tty_struct *);
 
 extern struct ktermios tty_std_termios;
 
-extern void console_init(void);
 extern int vcs_init(void);
 
 extern struct class *tty_class;
@@ -342,7 +374,6 @@ static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
                 kref_get(&tty->kref);
         return tty;
 }
-extern void tty_kref_put(struct tty_struct *tty);
 
 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
                               const char *routine);
@@ -374,18 +405,15 @@ extern void tty_driver_remove_tty(struct tty_driver *driver,
                                   struct tty_struct *tty);
 extern void tty_free_termios(struct tty_struct *tty);
 extern int is_current_pgrp_orphaned(void);
-extern struct pid *tty_get_pgrp(struct tty_struct *tty);
 extern int is_ignored(int sig);
 extern int tty_signal(int sig, struct tty_struct *tty);
 extern void tty_hangup(struct tty_struct *tty);
 extern void tty_vhangup(struct tty_struct *tty);
 extern void tty_vhangup_locked(struct tty_struct *tty);
-extern void tty_vhangup_self(void);
 extern void tty_unhangup(struct file *filp);
 extern int tty_hung_up_p(struct file *filp);
 extern void do_SAK(struct tty_struct *tty);
 extern void __do_SAK(struct tty_struct *tty);
-extern void disassociate_ctty(int priv);
 extern void no_tty(void);
 extern void tty_flush_to_ldisc(struct tty_struct *tty);
 extern void tty_buffer_free_all(struct tty_port *port);
@@ -415,9 +443,6 @@ extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
                         unsigned int cmd, unsigned long arg);
 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
-extern dev_t tty_devnum(struct tty_struct *tty);
-extern void proc_clear_tty(struct task_struct *p);
-extern struct tty_struct *get_current_tty(void);
 extern void tty_default_fops(struct file_operations *fops);
 extern struct tty_struct *alloc_tty_struct(void);
 extern int tty_alloc_file(struct file *file);
@@ -543,9 +568,6 @@ static inline int tty_audit_push_task(struct task_struct *tsk,
 }
 #endif
 
-/* tty_io.c */
-extern int __init tty_init(void);
-
 /* tty_ioctl.c */
 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
                        unsigned int cmd, unsigned long arg);
diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb
index 43cb93fa2651..30894fab84d6 100644
--- a/lib/Kconfig.kgdb
+++ b/lib/Kconfig.kgdb
@@ -22,6 +22,7 @@ config KGDB_SERIAL_CONSOLE
         tristate "KGDB: use kgdb over the serial console"
         select CONSOLE_POLL
         select MAGIC_SYSRQ
+        depends on TTY
         default y
         help
           Share a serial console with kgdb. Sysrq-g must be used
diff --git a/net/bluetooth/rfcomm/Kconfig b/net/bluetooth/rfcomm/Kconfig
index 22e718b554e4..18d352ea2bc7 100644
--- a/net/bluetooth/rfcomm/Kconfig
+++ b/net/bluetooth/rfcomm/Kconfig
@@ -12,6 +12,7 @@ config BT_RFCOMM
 config BT_RFCOMM_TTY
         bool "RFCOMM TTY support"
         depends on BT_RFCOMM
+        depends on TTY
         help
           This option enables TTY emulation support for RFCOMM channels.
 
diff --git a/net/irda/ircomm/Kconfig b/net/irda/ircomm/Kconfig
index 2d4c6b4a78d6..19492c1707b7 100644
--- a/net/irda/ircomm/Kconfig
+++ b/net/irda/ircomm/Kconfig
@@ -1,6 +1,6 @@
 config IRCOMM
         tristate "IrCOMM protocol"
-        depends on IRDA
+        depends on IRDA && TTY
         help
           Say Y here if you want to build support for the IrCOMM protocol.
           To compile it as modules, choose M here: the modules will be
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 3a847828932a..298822c0ad65 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -34,7 +34,7 @@ config SND_SOC_ALL_CODECS
         select SND_SOC_CS42L73 if I2C
         select SND_SOC_CS4270 if I2C
         select SND_SOC_CS4271 if SND_SOC_I2C_AND_SPI
-        select SND_SOC_CX20442
+        select SND_SOC_CX20442 if TTY
         select SND_SOC_DA7210 if I2C
         select SND_SOC_DA732X if I2C
         select SND_SOC_DA9055 if I2C
@@ -236,6 +236,7 @@ config SND_SOC_CS4271
 
 config SND_SOC_CX20442
         tristate
+        depends on TTY
 
 config SND_SOC_JZ4740_CODEC
         select REGMAP_MMIO