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Commit 134620f7 authored Oct 31, 2011 by Yanmin Zhang Committed by Linus Torvalds Oct 31, 2011

printk: add console_suspend module parameter



We are enabling some power features on medfield.  To test suspend-2-RAM
conveniently, we need turn on/off console_suspend_enabled frequently.

Add a module parameter, so users could change it by:
/sys/module/printk/parameters/console_suspend

Signed-off-by: Yanmin Zhang <yanmin_zhang@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 0eca6b7c

Documentation/kernel-parameters.txt

+5 −0

Original line number	Diff line number	Diff line
		@@ -1669,6 +1669,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
		debugging driver suspend/resume hooks). This may
		not work reliably with all consoles, but is known
		to work with serial and VGA consoles.
		To facilitate more flexible debugging, we also add
		console_suspend, a printk module parameter to control
		it. Users could use console_suspend (usually
		/sys/module/printk/parameters/console_suspend) to
		turn on/off it dynamically.

		noaliencache [MM, NUMA, SLAB] Disables the allocation of alien
		caches in the slab allocator. Saves per-node memory,

kernel/printk.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -1111,6 +1111,10 @@ static int __init console_suspend_disable(char *str)
		return 1;
		}
		__setup("no_console_suspend", console_suspend_disable);
		module_param_named(console_suspend, console_suspend_enabled,
		bool, S_IRUGO \| S_IWUSR);
		MODULE_PARM_DESC(console_suspend, "suspend console during suspend"
		" and hibernate operations");

		/**
		* suspend_console - suspend the console subsystem