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.

Below patch adds a module parameter, so users could change it by:
/sys/module/printk/parameters/ignore_loglevel

---
 kernel/printk.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

index ce00f1b..12d4437 100644
@@ -530,6 +530,7 @@ 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);
 
 /*
  * Write out chars from start to end - 1 inclusive

1.7.1