linux/drivers/net/slip/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

81 lines
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#
# SLIP network device configuration
#
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
other local Unix box or if you want to configure your Linux box as a
Slip/CSlip server for other people to dial in. SLIP (Serial Line
Internet Protocol) is a protocol used to send Internet traffic over
serial connections such as telephone lines or null modem cables;
nowadays, the protocol PPP is more commonly used for this same
purpose.
Normally, your access provider has to support SLIP in order for you
to be able to use it, but there is now a SLIP emulator called SLiRP
around (available from
<ftp://ibiblio.org/pub/Linux/system/network/serial/>) which
allows you to use SLIP over a regular dial up shell connection. If
you plan to use SLiRP, make sure to say Y to CSLIP, below. The
NET-3-HOWTO, available from
<http://www.tldp.org/docs.html#howto>, explains how to
configure SLIP. Note that you don't need this option if you just
want to run term (term is a program which gives you almost full
Internet connectivity if you have a regular dial up shell account on
some Internet connected Unix computer. Read
<http://www.bart.nl/~patrickr/term-howto/Term-HOWTO.html>). SLIP
support will enlarge your kernel by about 4 KB. If unsure, say N.
To compile this driver as a module, choose M here. The module
will be called slip.
config SLHC
tristate
---help---
This option enables Van Jacobsen serial line header compression
routines.
if SLIP
config SLIP_COMPRESSED
bool "CSLIP compressed headers"
depends on SLIP
select SLHC
---help---
This protocol is faster than SLIP because it uses compression on the
TCP/IP headers (not on the data itself), but it has to be supported
on both ends. Ask your access provider if you are not sure and
answer Y, just in case. You will still be able to use plain SLIP. If
you plan to use SLiRP, the SLIP emulator (available from
<ftp://ibiblio.org/pub/Linux/system/network/serial/>) which
allows you to use SLIP over a regular dial up shell connection, you
definitely want to say Y here. The NET-3-HOWTO, available from
<http://www.tldp.org/docs.html#howto>, explains how to configure
CSLIP. This won't enlarge your kernel.
config SLIP_SMART
bool "Keepalive and linefill"
depends on SLIP
---help---
Adds additional capabilities to the SLIP driver to support the
RELCOM line fill and keepalive monitoring. Ideal on poor quality
analogue lines.
config SLIP_MODE_SLIP6
bool "Six bit SLIP encapsulation"
depends on SLIP
---help---
Just occasionally you may need to run IP over hostile serial
networks that don't pass all control characters or are only seven
bit. Saying Y here adds an extra mode you can use with SLIP:
"slip6". In this mode, SLIP will only send normal ASCII symbols over
the serial device. Naturally, this has to be supported at the other
end of the link as well. It's good enough, for example, to run IP
over the async ports of a Camtec JNT Pad. If unsure, say N.
endif # SLIP