From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gu Zheng Subject: [PATCH 1/2] Kernel/time: Introduce a new timestamp function local_time_seconds() Date: Tue, 14 May 2013 15:45:43 +0800 Message-ID: <5191EBA7.9010303@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: john.stultz@linaro.org, Andrew Morton Cc: linux-kernel , JBottomley@parallels.com, linux-scsi@vger.kernel.org List-Id: linux-scsi@vger.kernel.org >>From 18072c1c3506a7e37ee485307a2c343efe5af4d0 Mon Sep 17 00:00:00 2001 From: Gu Zheng Date: Mon, 13 May 2013 15:45:24 +0900 Subject: [PATCH 1/2] Kernel/time: Introduce a new timestamp function local_time_seconds() Introduce a new timestamp function local_time_seconds() to hide the conversion of system time in UTC to local time seconds. Signed-off-by: Gu Zheng --- include/linux/time.h | 1 + kernel/time.c | 11 +++++++++++ 2 files changed, 12 insertions(+), 0 deletions(-) diff --git a/include/linux/time.h b/include/linux/time.h index 22d81b3..1aec534 100644 --- a/include/linux/time.h +++ b/include/linux/time.h @@ -271,4 +271,5 @@ static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) a->tv_nsec = ns; } +extern u32 local_time_seconds(void); #endif diff --git a/kernel/time.c b/kernel/time.c index d3617db..715377d 100644 --- a/kernel/time.c +++ b/kernel/time.c @@ -712,3 +712,14 @@ struct timespec timespec_add_safe(const struct timespec lhs, return res; } + +/* + * Convert system time in UTC to local time seconds. + */ +u32 local_time_seconds(void) +{ + struct timeval utc; + do_gettimeofday(&utc); + return (u32)(utc.tv_sec - (sys_tz.tz_minuteswest * 60)); +} +EXPORT_SYMBOL(local_time_seconds); -- 1.7.1