From 134620f7a865b3bc9e3d56d460603592b70ede21 Mon Sep 17 00:00:00 2001 From: Yanmin Zhang Date: Mon, 31 Oct 2011 17:11:27 -0700 Subject: [PATCH] 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/kernel-parameters.txt | 5 +++++ kernel/printk.c | 4 ++++ 2 files changed, 9 insertions(+) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 106efe1..c2efe28 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -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, diff --git a/kernel/printk.c b/kernel/printk.c index e62f949..6d9dedd 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 -- 2.7.4