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Subject[PATCH v3] add printk.time option, deprecate 'time'
On Tue, 29 May 2007 13:07:05 -0700 Andrew Morton wrote:

> That's going to break a *lot* of people's setups - timestamping appears
> to be very popular. We will get sad emails from people.
> If we're going to do this then I'm afraid we should retain the `time='
> thing for a while and add a this-is-going-away printk to it.

[$ ~/patch/printk-time-onoff.patch
Your patch has no obvious style problems and is ready for submission.]

From: Randy Dunlap <>

Allow printk_time to be enabled or disabled at boot time.
Previously it could be enabled only, but not disabled.

Change printk_time from an int to a bool since that's what it is.
Make its logical (exposed) name just be "time" (was "printk_time").

Note: Changes kernel boot option syntax from "time" to "printk.time=value".

Since printk_time is declared as a module_param, it can also be
changed at run-time by modifying
to a value of 1/Y/y to enabled it or 0/N/n to disable it.

Since printk_time is declared as a module_param, its value can also
be set at boot-time by using
linux printk.time=<bool>

If the "time" boot option is used, print a message that it is deprecated
and will be removed.
Note its planned removal in feature-removal-schedule.txt.

Signed-off-by: Randy Dunlap <>
Documentation/feature-removal-schedule.txt | 7 +++++++
Documentation/kernel-parameters.txt | 4 ++++
kernel/printk.c | 5 ++++-
3 files changed, 15 insertions(+), 1 deletion(-)

--- linux-2622-rc3.orig/Documentation/kernel-parameters.txt
+++ linux-2622-rc3/Documentation/kernel-parameters.txt
@@ -1426,6 +1426,9 @@ and is between 256 and 4096 characters.
Ranges are in pairs (memory base and size).

+ printk.time= Show timing data prefixed to each printk message line
+ Format: <bool> (1/Y/y=enable, 0/N/n=disable)
profile= [KNL] Enable kernel profiling via /proc/profile
Format: [schedule,]<number>
Param: "schedule" - profile schedule points.
@@ -1826,6 +1829,7 @@ and is between 256 and 4096 characters.
Set number of hash buckets for TCP connection

time Show timing data prefixed to each printk message line
+ [deprecated, see 'printk.time']

tipar.timeout= [HW,PPT]
Set communications timeout in tenths of a second
--- linux-2622-rc3.orig/kernel/printk.c
+++ linux-2622-rc3/kernel/printk.c
@@ -449,13 +449,16 @@ static int printk_time = 1;
static int printk_time = 0;
-module_param(printk_time, int, S_IRUGO | S_IWUSR);
+module_param_named(time, printk_time, bool, S_IRUGO | S_IWUSR);

static int __init printk_time_setup(char *str)
if (*str)
return 0;
printk_time = 1;
+ printk(KERN_NOTICE "The 'time' option is deprecated and "
+ "is scheduled for removal in early 2008\n");
+ printk(KERN_NOTICE "Use 'printk.time=<value>' instead\n");
return 1;

--- linux-2622-rc3.orig/Documentation/feature-removal-schedule.txt
+++ linux-2622-rc3/Documentation/feature-removal-schedule.txt
@@ -346,3 +346,10 @@ Who: Tejun Heo <>


+What: 'time' kernel boot parameter
+When: January 2008
+Why: replaced by 'printk.time=<value>' so that printk timestamps can be
+ enabled or disabled as needed
+Who: Randy Dunlap <>
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