From: Yanmin Zhang Date: Wed, 24 Aug 2011 23:47:34 +0000 (+1000) Subject: We are enabling some power features on medfield. To test suspend-2-RAM X-Git-Tag: next-20110905~1^2~31 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=df338d89abc21e61c9deab281f4c9184edbf121a;p=karo-tx-linux.git 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 Signed-off-by: Andrew Morton --- diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 3ddd846e3b41..ccfc61ad32e9 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1668,6 +1668,11 @@ 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, diff --git a/kernel/printk.c b/kernel/printk.c index 4b2be8ab869b..e86148856736 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -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