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Date: Mon, 05 Mar 2007 08:56:48 -0800 From: Daniel Walker <dwalker@...sta.com> To: akpm@...ux-foundation.org Cc: linux-kernel@...r.kernel.org, johnstul@...ibm.com Subject: [PATCH] fix vsyscall settimeofday 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@...sta.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 */ -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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