From 3b9c04106b70e46803c69d13d5da32f6129fa76d Mon Sep 17 00:00:00 2001 From: Jan Engelhardt Date: Sun, 25 Jun 2006 05:48:15 -0700 Subject: [PATCH] [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 /sys/modules/printk/parameters/printk_time. Signed-off-by: Jan Engelhardt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/printk.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/printk.c b/kernel/printk.c index 6b89dd9d11b6..95b7fe17f124 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -24,6 +24,7 @@ #include #include #include +#include #include /* For in_interrupt() */ #include #include @@ -439,6 +440,7 @@ static int printk_time = 1; #else static int printk_time = 0; #endif +module_param(printk_time, int, S_IRUGO | S_IWUSR); static int __init printk_time_setup(char *str) { -- 2.20.1