linux-stable/drivers/s390/char/Kconfig
Joe Millenbach 4f73bc4dd3 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>
2013-01-18 16:15:27 -08:00

178 lines
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comment "S/390 character device drivers"
depends on S390
config TN3270
def_tristate y
prompt "Support for locally attached 3270 terminals"
depends on CCW
help
Include support for IBM 3270 terminals.
config TN3270_TTY
def_tristate y
prompt "Support for tty input/output on 3270 terminals"
depends on TN3270 && TTY
help
Include support for using an IBM 3270 terminal as a Linux tty.
config TN3270_FS
def_tristate m
prompt "Support for fullscreen applications on 3270 terminals"
depends on TN3270
help
Include support for fullscreen applications on an IBM 3270 terminal.
config TN3270_CONSOLE
def_bool y
prompt "Support for console on 3270 terminal"
depends on TN3270=y && TN3270_TTY=y
help
Include support for using an IBM 3270 terminal as a Linux system
console. Available only if 3270 support is compiled in statically.
config TN3215
def_bool y
prompt "Support for 3215 line mode terminal"
depends on CCW && TTY
help
Include support for IBM 3215 line-mode terminals.
config TN3215_CONSOLE
def_bool y
prompt "Support for console on 3215 line mode terminal"
depends on TN3215
help
Include support for using an IBM 3215 line-mode terminal as a
Linux system console.
config CCW_CONSOLE
def_bool y if TN3215_CONSOLE || TN3270_CONSOLE
config SCLP_TTY
def_bool y
prompt "Support for SCLP line mode terminal"
depends on S390 && TTY
help
Include support for IBM SCLP line-mode terminals.
config SCLP_CONSOLE
def_bool y
prompt "Support for console on SCLP line mode terminal"
depends on SCLP_TTY
help
Include support for using an IBM HWC line-mode terminal as the Linux
system console.
config SCLP_VT220_TTY
def_bool y
prompt "Support for SCLP VT220-compatible terminal"
depends on S390 && TTY
help
Include support for an IBM SCLP VT220-compatible terminal.
config SCLP_VT220_CONSOLE
def_bool y
prompt "Support for console on SCLP VT220-compatible terminal"
depends on SCLP_VT220_TTY
help
Include support for using an IBM SCLP VT220-compatible terminal as a
Linux system console.
config SCLP_CPI
def_tristate m
prompt "Control-Program Identification"
depends on S390
help
This option enables the hardware console interface for system
identification. This is commonly used for workload management and
gives you a nice name for the system on the service element.
Please select this option as a module since built-in operation is
completely untested.
You should only select this option if you know what you are doing,
need this feature and intend to run your kernel in LPAR.
config SCLP_ASYNC
def_tristate m
prompt "Support for Call Home via Asynchronous SCLP Records"
depends on S390
help
This option enables the call home function, which is able to inform
the service element and connected organisations about a kernel panic.
You should only select this option if you know what you are doing,
want for inform other people about your kernel panics,
need this feature and intend to run your kernel in LPAR.
config S390_TAPE
def_tristate m
prompt "S/390 tape device support"
depends on CCW
help
Select this option if you want to access channel-attached tape
devices on IBM S/390 or zSeries.
If you select this option you will also want to select at
least one of the tape interface options and one of the tape
hardware options in order to access a tape device.
This option is also available as a module. The module will be
called tape390 and include all selected interfaces and
hardware drivers.
comment "S/390 tape hardware support"
depends on S390_TAPE
config S390_TAPE_34XX
def_tristate m
prompt "Support for 3480/3490 tape hardware"
depends on S390_TAPE
help
Select this option if you want to access IBM 3480/3490 magnetic
tape subsystems and 100% compatibles.
It is safe to say "Y" here.
config S390_TAPE_3590
def_tristate m
prompt "Support for 3590 tape hardware"
depends on S390_TAPE
help
Select this option if you want to access IBM 3590 magnetic
tape subsystems and 100% compatibles.
It is safe to say "Y" here.
config VMLOGRDR
def_tristate m
prompt "Support for the z/VM recording system services (VM only)"
depends on IUCV
help
Select this option if you want to be able to receive records collected
by the z/VM recording system services, eg. from *LOGREC, *ACCOUNT or
*SYMPTOM.
This driver depends on the IUCV support driver.
config VMCP
def_bool y
prompt "Support for the z/VM CP interface"
depends on S390
help
Select this option if you want to be able to interact with the control
program on z/VM
config MONREADER
def_tristate m
prompt "API for reading z/VM monitor service records"
depends on IUCV
help
Character device driver for reading z/VM monitor service records
config MONWRITER
def_tristate m
prompt "API for writing z/VM monitor service records"
depends on S390
help
Character device driver for writing z/VM monitor service records
config S390_VMUR
def_tristate m
prompt "z/VM unit record device driver"
depends on S390
help
Character device driver for z/VM reader, puncher and printer.