[PATCH] fix vsyscall settimeofday

[Daniel Walker <dwalker@mvista.com>]

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.

Any thought John?

Signed-Off-By: Daniel Walker <dwalker@mvista.com>

---
 kernel/timer.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-2.6.20/kernel/timer.c
===================================================================
--- linux-2.6.20.orig/kernel/timer.c
+++ linux-2.6.20/kernel/timer.c
@@ -861,6 +861,8 @@ int do_settimeofday(struct timespec *tv)
 	clock->error = 0;
 	ntp_clear();
 
+	update_vsyscall(&xtime, clock);
+
 	write_sequnlock_irqrestore(&xtime_lock, flags);
 
 	/* signal hrtimers about time change */
--