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/s390/char/Kconfig | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'drivers/s390/char') diff --git a/drivers/s390/char/Kconfig b/drivers/s390/char/Kconfig index 2c9a776bd63..71bf959732f 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. -- cgit v1.2.3-70-g09d2