lkml.org 
[lkml]   [2012]   [Aug]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[v2.6.34-stable 110/165] ntp: Correct TAI offset during leap second
    Date
    From: Richard Cochran <richardcochran@gmail.com>

    -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git
    If you see a problem with using this for longterm, please comment.
    -------------------

    commit dd48d708ff3e917f6d6b6c2b696c3f18c019feed upstream.

    When repeating a UTC time value during a leap second (when the UTC
    time should be 23:59:60), the TAI timescale should not stop. The kernel
    NTP code increments the TAI offset one second too late. This patch fixes
    the issue by incrementing the offset during the leap second itself.

    Signed-off-by: Richard Cochran <richardcochran@gmail.com>
    Cc: Prarit Bhargava <prarit@redhat.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Linux Kernel <linux-kernel@vger.kernel.org>
    Signed-off-by: John Stultz <john.stultz@linaro.org>
    Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
    ---
    kernel/time/ntp.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
    index 2522ab8..ec08c06 100644
    --- a/kernel/time/ntp.c
    +++ b/kernel/time/ntp.c
    @@ -208,6 +208,7 @@ int second_overflow(unsigned long secs)
    if (secs % 86400 == 0) {
    leap = -1;
    time_state = TIME_OOP;
    + time_tai++;
    printk(KERN_NOTICE
    "Clock: inserting leap second 23:59:60 UTC\n");
    }
    @@ -222,7 +223,6 @@ int second_overflow(unsigned long secs)
    }
    break;
    case TIME_OOP:
    - time_tai++;
    time_state = TIME_WAIT;
    break;

    --
    1.7.12.rc2


    \
     
     \ /
      Last update: 2012-08-15 23:23    [W:4.035 / U:0.404 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site