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timekeeping: Avoid adjust kernel time once hwclock kept in UTC time

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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>
[jstultz: Updated to merge with conflicting changes ]
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Dong Zhu 2012-12-06 22:03:34 +08:00 committed by John Stultz
parent 7c6baa304b
commit c30bd09915
1 changed files with 6 additions and 5 deletions
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11
kernel/time.c
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@ -138,13 +138,14 @@ int persistent_clock_is_local;
*/
static inline void warp_clock(void)
{
struct timespec adjust;
if (sys_tz.tz_minuteswest != 0) {
struct timespec adjust;
adjust = current_kernel_time();
if (sys_tz.tz_minuteswest != 0)
persistent_clock_is_local = 1;
adjust.tv_sec += sys_tz.tz_minuteswest * 60;
do_settimeofday(&adjust);
adjust = current_kernel_time();
adjust.tv_sec += sys_tz.tz_minuteswest * 60;
do_settimeofday(&adjust);
}
}
/*