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authorJoe Millenbach <jmillenbach@gmail.com>2013-01-17 22:44:22 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-18 16:15:27 -0800
commit4f73bc4dd3e8563ef4109f293a092820dff66d92 (patch)
tree8ebd5d01abaceb70da1932db1a5e7219630b0fd3 /drivers/char/Kconfig
parenta1bf9584429d61b7096f93ae09325e1ba538e9e8 (diff)
downloadlinux-4f73bc4dd3e8563ef4109f293a092820dff66d92.tar.gz
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>
Diffstat (limited to 'drivers/char/Kconfig')
-rw-r--r--drivers/char/Kconfig7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 72bedad6bf8..3bb6fa3930b 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