Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=746976a301ac9c9aa10d7d42454f8d6cdad8ff2b Commit: 746976a301ac9c9aa10d7d42454f8d6cdad8ff2b Parent: 872aad45d6174570dd2e1defc3efee50f2cfcc72 Author: Thomas Gleixner <[EMAIL PROTECTED]> AuthorDate: Tue Jul 3 20:05:20 2007 +0200 Committer: Linus Torvalds <[EMAIL PROTECTED]> CommitDate: Tue Jul 3 13:54:27 2007 -0700
NTP: remove clock_was_set() call to prevent deadlock The clock_was_set() call in seconds_overflow() which happens only when leap seconds are inserted / deleted is wrong in two aspects: 1. it results in a call to on_each_cpu() with interrupts disabled 2. it is potential deadlock source vs. call_lock in smp_call_function() The only possible side effect of the removal might be, that an absolute CLOCK_REALTIME timer fires 1 second too late, in the rare case of leap second deletion and an absolute CLOCK_REALTIME timer which expires in the affected time frame. It will never fire too early. This was probably observed by the reporter of a June 30th -> July 1st hang: http://lkml.org/lkml/2007/7/3/103 A similar problem was observed by Dave Jones, who provided a screen shot with a lockdep back trace, which allowed to analyse the problem. Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]> Acked-by: Ingo Molnar <[EMAIL PROTECTED]> Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]> --- kernel/time/ntp.c | 2 -- 1 files changed, 0 insertions(+), 2 deletions(-) diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index 87aa5ff..cf53bb5 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -122,7 +122,6 @@ void second_overflow(void) */ time_interpolator_update(-NSEC_PER_SEC); time_state = TIME_OOP; - clock_was_set(); printk(KERN_NOTICE "Clock: inserting leap second " "23:59:60 UTC\n"); } @@ -137,7 +136,6 @@ void second_overflow(void) */ time_interpolator_update(NSEC_PER_SEC); time_state = TIME_WAIT; - clock_was_set(); printk(KERN_NOTICE "Clock: deleting leap second " "23:59:59 UTC\n"); } - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html