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SubjectRe: [PATCH] timekeeping: avoid adjust kernel time once hwclock kept in UTC time
On Thu, Dec 06, 2012 at 10:03:34PM +0800, Dong Zhu wrote:
> From c126376cf1837b0956e0268056db61870fbbc1d4 Mon Sep 17 00:00:00 2001
> From: Dong Zhu <bluezhudong@gmail.com>
> 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@gmail.com>
> ---
> kernel/time.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/kernel/time.c b/kernel/time.c
> index d226c6a..0b592ce 100644
> --- a/kernel/time.c
> +++ b/kernel/time.c
> @@ -134,9 +134,11 @@ static inline void warp_clock(void)
> {
> struct timespec adjust;
>
> - adjust = current_kernel_time();
> - adjust.tv_sec += sys_tz.tz_minuteswest * 60;
> - do_settimeofday(&adjust);
> + if (sys_tz.tz_minuteswest) {
> + adjust = current_kernel_time();
> + adjust.tv_sec += sys_tz.tz_minuteswest * 60;
> + do_settimeofday(&adjust);
> + }
> }
>
> /*
> --
> 1.7.11.7
>

Hi,

Any comments ?

--
Best Regards,
Dong Zhu


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