Re: [PATCH] time, ntp: Do not update time_state in middle of leap second

[Peter Zijlstra]

On Sat, Feb 07, 2015 at 01:29:39PM -0500, Prarit Bhargava wrote:
> During leap second insertion testing it was noticed that a small window
> exists where the time_state could be reset such that
> time_state = TIME_OK, which then causes the leap second to not occur, or
> causes the entire leap second state machine to fail.
> 
> While this is highly unlikely to ever happen in the real world it is
> still something we should protect against, as breaking the state machine
> is obviously bad.
> 
> If the time_state == TIME_OOP (ie, the leap second is in progress) do not
> allow an external update to time_state.
> 
> [v2]: Only block time_state change when TIME_OOP
> 
> Signed-off-by: Prarit Bhargava <prarit@xxxxxxxxxx>
> Cc: John Stultz <john.stultz@xxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Miroslav Lichvar <mlichvar@xxxxxxxxxx>

John, ACK?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/