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add printk.time option, deprecate 'time'

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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
  /sys/module/printk/parameters/time
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 <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Randy Dunlap 2007-07-15 23:40:25 -07:00 committed by Linus Torvalds
parent 185848707e
commit e84845c4bf
3 changed files with 16 additions and 1 deletions
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8
Documentation/feature-removal-schedule.txt
View file

@ -257,6 +257,14 @@ Who: Jean Delvare <khali@linux-fr.org>
---------------------------
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 <randy.dunlap@oracle.com>
---------------------------
What: drivers depending on OSS_OBSOLETE
When: options in 2.6.23, code in 2.6.25
Why: obsolete OSS drivers

4
Documentation/kernel-parameters.txt
View file

@ -1389,6 +1389,9 @@ and is between 256 and 4096 characters. It is defined in the file
the kernel console.
default: off.
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.
@ -1824,6 +1827,7 @@ and is between 256 and 4096 characters. It is defined in the file
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

5
kernel/printk.c
View file

@ -449,13 +449,16 @@ static int printk_time = 1;
#else
static int printk_time = 0;
#endif
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;
}