From 4f73bc4dd3e8563ef4109f293a092820dff66d92 Mon Sep 17 00:00:00 2001 From: Joe Millenbach Date: Thu, 17 Jan 2013 22:44:22 -0800 Subject: 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 Reviewed-by: Jamey Sharp Reviewed-by: Josh Triplett Signed-off-by: Greg Kroah-Hartman --- drivers/net/caif/Kconfig | 2 +- drivers/net/can/Kconfig | 2 +- drivers/net/hamradio/Kconfig | 4 ++-- drivers/net/irda/Kconfig | 2 +- drivers/net/ppp/Kconfig | 3 +++ drivers/net/slip/Kconfig | 1 + drivers/net/usb/Kconfig | 4 ++-- drivers/net/wan/Kconfig | 2 +- 8 files changed, 12 insertions(+), 8 deletions(-) (limited to 'drivers/net') diff --git a/drivers/net/caif/Kconfig b/drivers/net/caif/Kconfig index abf4d7a9dcc..60c2142373c 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 b56bd9e8095..72df3a306a0 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 95dbcfdf131..bf5e5968768 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 595205406d7..e1454cdec14 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 872df3ef07a..3d9ef4f1e60 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 211b160e4e9..48e68714eef 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 ef976215b64..bd33153261c 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 d58431e99f7..61eb8994b34 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. -- cgit v1.2.3-70-g09d2