Commit e84845c4 authored by Randy Dunlap's avatar Randy Dunlap Committed by Linus Torvalds
Browse files

add printk.time option, deprecate 'time' 



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: default avatarRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 18584870

Documentation/feature-removal-schedule.txt

+8 −0
Original line number Diff line number Diff line
@@ -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

Documentation/kernel-parameters.txt

+4 −0
Original line number Diff line number Diff line
@@ -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

kernel/printk.c

+4 −1
Original line number Diff line number Diff line
@@ -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;

}

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