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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 <yanmin.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Yanmin Zhang
2011-10-31 17:11:25 -07:00
committed by Linus Torvalds
parent 73efc0394e
commit 0eca6b7c78
2 changed files with 6 additions and 0 deletions
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3
Documentation/kernel-parameters.txt
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@@ -973,6 +973,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
ignore_loglevel [KNL] ignore_loglevel [KNL]
Ignore loglevel setting - this will print /all/ Ignore loglevel setting - this will print /all/
kernel messages to the console. Useful for debugging. 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] ihash_entries= [KNL]
Set number of hash buckets for inode cache. Set number of hash buckets for inode cache.

3
kernel/printk.c
View File

@@ -532,6 +532,9 @@ static int __init ignore_loglevel_setup(char *str)
} }
early_param("ignore_loglevel", ignore_loglevel_setup); 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 * Write out chars from start to end - 1 inclusive