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[PATCH] fix vsyscall settimeofday

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I've only seen this on x86_64.

The vsyscall state only gets updated when a timer interrupts comes in.  So
if the time is set long before the next timer, there will be a period when
a gettimeofday() won't reflect the correct time.

I added an explicit update_vsyscall() during the settimeofday(), that way
the vsyscall state doesn't get stale.

Signed-off-by: Daniel Walker <dwalker@mvista.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Acked-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Daniel Walker 2007-03-06 01:42:11 -08:00 committed by Linus Torvalds
parent 7a434814c7
commit 90675a27fa
1 changed files with 2 additions and 0 deletions
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2
kernel/timer.c
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@ -862,6 +862,8 @@ int do_settimeofday(struct timespec *tv)
clock->error = 0; clock->error = 0;
ntp_clear(); ntp_clear();
update_vsyscall(&xtime, clock);
write_sequnlock_irqrestore(&xtime_lock, flags); write_sequnlock_irqrestore(&xtime_lock, flags);
/* signal hrtimers about time change */ /* signal hrtimers about time change */