From c30bd09915ea243603d7803d53de890c4a6f1474 Mon Sep 17 00:00:00 2001 From: Dong Zhu Date: Thu, 6 Dec 2012 22:03:34 +0800 Subject: 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 [jstultz: Updated to merge with conflicting changes ] Signed-off-by: John Stultz --- kernel/time.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/kernel/time.c b/kernel/time.c index f8342a41efa6..effac571589f 100644 --- a/kernel/time.c +++ b/kernel/time.c @@ -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); + } } /* -- cgit v1.2.3-59-g8ed1b