serial: turn serial console suspend a boot rather than compile time option
commit8f4ce8c32f2dc2bc2411cafe39976fc5c0adfabf
authorAndres Salomon <dilinger@debian.org>
Thu, 18 Oct 2007 10:04:50 +0000 (18 03:04 -0700)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Thu, 18 Oct 2007 21:37:19 +0000 (18 14:37 -0700)
tree04f9009812e13f97b3eaae6385a0bb49cc2312b1
parent438e2ce68dfd4af4cfcec2f873564fb921db4bb5
serial: turn serial console suspend a boot rather than compile time option

Currently, there's a CONFIG_DISABLE_CONSOLE_SUSPEND that allows one to stop
the serial console from being suspended when the rest of the machine goes
to sleep.  This is incredibly useful for debugging power management-related
things; however, having it as a compile-time option has proved to be
incredibly inconvenient for us (OLPC).  There are plenty of times that we
want serial console to not suspend, but for the most part we'd like serial
console to be suspended.

This drops CONFIG_DISABLE_CONSOLE_SUSPEND, and replaces it with a kernel
boot parameter (no_console_suspend).  By default, the serial console will
be suspended along with the rest of the system; by passing
'no_console_suspend' to the kernel during boot, serial console will remain
alive during suspend.

For now, this is pretty serial console specific; further fixes could be
applied to make this work for things like netconsole.

Signed-off-by: Andres Salomon <dilinger@debian.org>
Acked-by: "Rafael J. Wysocki" <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Nigel Cunningham <nigel@suspend2.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Documentation/kernel-parameters.txt
Documentation/power/basic-pm-debugging.txt
arch/powerpc/configs/pmac32_defconfig
drivers/serial/serial_core.c
include/linux/console.h
kernel/power/Kconfig
kernel/printk.c