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    Subject[PATCH] use printk.time option, drop time/notime
    From: Randy Dunlap <>

    Andrew, please drop add-notime-boot-option.patch
    and use this patch instead...

    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>

    Drop the "time" boot option and its __setup() functions.

    Signed-off-by: Randy Dunlap <>
    Documentation/kernel-parameters.txt | 5 +++--
    kernel/printk.c | 12 +-----------
    2 files changed, 4 insertions(+), 13 deletions(-)

    --- linux-2622-rc2g5.orig/Documentation/kernel-parameters.txt
    +++ linux-2622-rc2g5/Documentation/kernel-parameters.txt
    @@ -1406,6 +1406,9 @@ 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.
    @@ -1805,8 +1808,6 @@ and is between 256 and 4096 characters.
    thash_entries= [KNL,NET]
    Set number of hash buckets for TCP connection

    - time Show timing data prefixed to each printk message line
    clocksource= [GENERIC_TIME] Override the default clocksource
    Override the default clocksource and use the clocksource
    with the name specified.
    --- linux-2622-rc2g5.orig/kernel/printk.c
    +++ linux-2622-rc2g5/kernel/printk.c
    @@ -449,17 +449,7 @@ static int printk_time = 1;
    static int printk_time = 0;
    -module_param(printk_time, int, S_IRUGO | S_IWUSR);
    -static int __init printk_time_setup(char *str)
    - if (*str)
    - return 0;
    - printk_time = 1;
    - return 1;
    -__setup("time", printk_time_setup);
    +module_param_named(time, printk_time, bool, S_IRUGO | S_IWUSR);

    __attribute__((weak)) unsigned long long printk_clock(void)
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      Last update: 2007-05-25 02:13    [W:0.027 / U:28.348 seconds]
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