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printk: add module parameter ignore_loglevel to control ignore_loglevel

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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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Yanmin Zhang 2011-10-31 17:11:25 -07:00 • committed by Linus Torvalds
commit 0eca6b7c78
2 changed files with 6 additions and 0 deletions
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3
kernel/printk.c
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@ -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