From: Yanmin Zhang Date: Tue, 1 Nov 2011 00:11:25 +0000 (-0700) Subject: printk: add module parameter ignore_loglevel to control ignore_loglevel X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0eca6b7c78fd997e02bd9850e608102382b7822e;p=linux-beck.git printk: add module parameter ignore_loglevel to control ignore_loglevel We are enabling some power features on medfield. To test suspend-2-RAM conveniently, we need turn on/off ignore_loglevel frequently without rebooting. Add a module parameter, so users can change it by: /sys/module/printk/parameters/ignore_loglevel Signed-off-by: Yanmin Zhang Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 27e0488d54d2..106efe1e2bab 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -973,6 +973,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted. ignore_loglevel [KNL] Ignore loglevel setting - this will print /all/ kernel messages to the console. Useful for debugging. + We also add it as printk module parameter, so users + could change it dynamically, usually by + /sys/module/printk/parameters/ignore_loglevel. ihash_entries= [KNL] Set number of hash buckets for inode cache. diff --git a/kernel/printk.c b/kernel/printk.c index b7da18391c38..e62f949ec140 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -532,6 +532,9 @@ static int __init ignore_loglevel_setup(char *str) } early_param("ignore_loglevel", ignore_loglevel_setup); +module_param_named(ignore_loglevel, ignore_loglevel, bool, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(ignore_loglevel, "ignore loglevel setting, to" + "print all kernel messages to the console."); /* * Write out chars from start to end - 1 inclusive