From: Xunlei Pang <[email protected]> There're many sites need comparing the two rtc_time variants for many rtc drivers, especially in the instances of rtc_class_ops::set_alarm().
So add this common helper function to make things easy. Suggested-by: Arnd Bergmann <[email protected]> Signed-off-by: Xunlei Pang <[email protected]> --- drivers/rtc/rtc-lib.c | 9 +++++++++ include/linux/rtc.h | 2 ++ 2 files changed, 11 insertions(+) diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c index e6bfb9c..fdb94cc 100644 --- a/drivers/rtc/rtc-lib.c +++ b/drivers/rtc/rtc-lib.c @@ -124,6 +124,15 @@ time64_t rtc_tm_to_time64(struct rtc_time *tm) EXPORT_SYMBOL(rtc_tm_to_time64); /* + * rtc_tm_subtract - Return the difference in seconds. + */ +time64_t rtc_tm_subtract(struct rtc_time *minuend, struct rtc_time *subtrahend) +{ + return rtc_tm_to_time64(minuend) - rtc_tm_to_time64(subtrahend); +} +EXPORT_SYMBOL_GPL(rtc_tm_subtract); + +/* * Convert rtc_time to ktime */ ktime_t rtc_tm_to_ktime(struct rtc_time tm) diff --git a/include/linux/rtc.h b/include/linux/rtc.h index 8dcf682..13e4138 100644 --- a/include/linux/rtc.h +++ b/include/linux/rtc.h @@ -21,6 +21,8 @@ extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year extern int rtc_valid_tm(struct rtc_time *tm); extern time64_t rtc_tm_to_time64(struct rtc_time *tm); extern void rtc_time64_to_tm(time64_t time, struct rtc_time *tm); +extern time64_t rtc_tm_subtract(struct rtc_time *minuend, + struct rtc_time *subtrahend); ktime_t rtc_tm_to_ktime(struct rtc_time tm); struct rtc_time rtc_ktime_to_tm(ktime_t kt); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
