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Subject[patch] add ignore_loglevel boot option
Subject: [patch] add ignore_loglevel boot option
From: Ingo Molnar <mingo@elte.hu>

sometimes the kernel prints something interesting while userspace
bootup keeps messages turned off via loglevel. Enable the printing
of /all/ kernel messages via the "ignore_loglevel" boot option.
Off by default.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
Documentation/kernel-parameters.txt | 4 ++++
kernel/printk.c | 14 +++++++++++++-
2 files changed, 17 insertions(+), 1 deletion(-)

Index: linux/Documentation/kernel-parameters.txt
===================================================================
--- linux.orig/Documentation/kernel-parameters.txt
+++ linux/Documentation/kernel-parameters.txt
@@ -657,6 +657,10 @@ and is between 256 and 4096 characters.
idle= [HW]
Format: idle=poll or idle=halt

+ ignore_loglevel [KNL]
+ Ignore loglevel setting - this will print /all/
+ kernel messages to the console. Useful for debugging.
+
ihash_entries= [KNL]
Set number of hash buckets for inode cache.

Index: linux/kernel/printk.c
===================================================================
--- linux.orig/kernel/printk.c
+++ linux/kernel/printk.c
@@ -352,13 +352,25 @@ static void __call_console_drivers(unsig
touch_critical_timing();
}

+static int __read_mostly ignore_loglevel;
+
+int __init ignore_loglevel_setup(char *str)
+{
+ ignore_loglevel = 1;
+ printk(KERN_INFO "debug: ignoring loglevel setting.\n");
+
+ return 1;
+}
+
+__setup("ignore_loglevel", ignore_loglevel_setup);
+
/*
* Write out chars from start to end - 1 inclusive
*/
static void _call_console_drivers(unsigned long start,
unsigned long end, int msg_log_level)
{
- if (msg_log_level < console_loglevel &&
+ if ((msg_log_level < console_loglevel || ignore_loglevel) &&
console_drivers && start != end) {
if ((start & LOG_BUF_MASK) > (end & LOG_BUF_MASK)) {
/* wrapped write */
-
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