Re: [PATCH] timekeeping: avoid adjust kernel time once hwclock keptin UTC time

From: John Stultz
Date: Fri Feb 22 2013 - 15:37:26 EST

On 12/06/2012 06:03 AM, Dong Zhu wrote:
From c126376cf1837b0956e0268056db61870fbbc1d4 Mon Sep 17 00:00:00 2001
From: Dong Zhu <bluezhudong@xxxxxxxxx>
Date: Thu, 6 Dec 2012 21:45:00 +0800
Subject: [PATCH] timekeeping: avoid adjust kernel time once hwclock kept in
UTC time

If the Hardware Clock kept in local time,kernel will adjust the time
to be UTC time.But if Hardware Clock kept in UTC time,system will make
a dummy settimeofday call first (sys_tz.tz_minuteswest = 0) to make sure
the time is not shifted,so at this point I think maybe it is not necessary
to set the kernel time once the sys_tz.tz_minuteswest is zero.

Signed-off-by: Dong Zhu <bluezhudong@xxxxxxxxx>

Sorry for the long delay here, and thank you for the reminder!

I've merged this patch in my tree (reworking it to merge with other changes in that area). And I'm likely to make a follow on patch that will use timekeeping_inject_offset() so we don't add any extra time error unnecessarily. Both will be queued for 3.10.


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