From: Randy Dunlap <randy.dunlap@oracle.com>
Add "notime" boot option to prevent timing data from being printed on
each printk message line.
We've seen a few cases of 'time' data locking problems (possibly
involving netconsole or net drivers). If a kernel is built with
CONFIG_PRINTK_TIME=y, it may have a boot locking hang. Booting
with "notime" may (i.e., could) prevent the lock hang and allow the
kernel to boot successfully, without requiring a kernel rebuild.
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
---
Documentation/kernel-parameters.txt | 2 ++
kernel/printk.c | 10 +++++++++-
2 files changed, 11 insertions(+), 1 deletion(-)
--- linux-2622-rc2.orig/Documentation/kernel-parameters.txt
+++ linux-2622-rc2/Documentation/kernel-parameters.txt
@@ -1227,6 +1227,8 @@ and is between 256 and 4096 characters.
nosync [HW,M68K] Disables sync negotiation for all devices.
+ notime Do not print timing data on each printk message line.
+
notsc [BUGS=IA-32] Disable Time Stamp Counter
nousb [USB] Disable the USB subsystem
--- linux-2622-rc2.orig/kernel/printk.c
+++ linux-2622-rc2/kernel/printk.c
@@ -458,9 +458,17 @@ static int __init printk_time_setup(char
printk_time = 1;
return 1;
}
-
__setup("time", printk_time_setup);
+static int __init printk_notime_setup(char *str)
+{
+ if (*str)
+ return 0;
+ printk_time = 0;
+ return 1;
+}
+__setup("notime", printk_notime_setup);
+
__attribute__((weak)) unsigned long long printk_clock(void)
{
return sched_clock();
-
