Commit 3b9c0410 authored by Jan Engelhardt's avatar Jan Engelhardt Committed by Linus Torvalds
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[PATCH] printk time parameter

Currently, enabling/disabling printk timestamps is only possible through
reboot (bootparam) or recompile.  I normally do not run with timestamps
(since syslog handles that in a good manner), but for measuring small
kernel delays (e.g.  irq probing - see parport thread) I needed subsecond
precision, but then again, just for some minutes rather than all kernel
messages to come.  The following patch adds a module_param() with which the
timestamps can be en-/disabled in a live system through

Signed-off-by: default avatarJan Engelhardt <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent e5dcd90b
......@@ -24,6 +24,7 @@
#include <linux/console.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/interrupt.h> /* For in_interrupt() */
#include <linux/config.h>
#include <linux/delay.h>
......@@ -439,6 +440,7 @@ static int printk_time = 1;
static int printk_time = 0;
module_param(printk_time, int, S_IRUGO | S_IWUSR);
static int __init printk_time_setup(char *str)
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