From: Jonghwa Lee <jonghwa3.lee@samsung.com>
To: linux-kernel@vger.kernel.org
Cc: a.zummo@towertech.it, Andrew Morton <akpm@linux-foundation.org>,
rtc-linux@googlegroups.com,
Jonghwa Lee <jonghwa3.lee@samsung.com>
Subject: [PATCH] rtc: Modify leap year test for more simpler way
Date: Wed, 06 Feb 2013 20:22:55 +0900 [thread overview]
Message-ID: <1360149775-19606-1-git-send-email-jonghwa3.lee@samsung.com> (raw)
Leap year which is multiple of 4, just needed 2 LSB for verifying.
A year with zero for all thease two bits means that it is leap year.
Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
---
include/linux/rtc.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/rtc.h b/include/linux/rtc.h
index 9531845..d662b8d 100644
--- a/include/linux/rtc.h
+++ b/include/linux/rtc.h
@@ -181,7 +181,7 @@ void rtc_timer_do_work(struct work_struct *work);
static inline bool is_leap_year(unsigned int year)
{
- return (!(year % 4) && (year % 100)) || !(year % 400);
+ return !(year & 0x3);
}
#ifdef CONFIG_RTC_HCTOSYS_DEVICE
--
1.7.9.5
next reply other threads:[~2013-02-06 11:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-06 11:22 Jonghwa Lee [this message]
2013-02-06 11:42 ` Venu Byravarasu
2013-02-06 12:43 ` jonghwa3.lee
2013-02-06 12:53 ` jonghwa3.lee
2013-02-06 13:00 ` Haojian Zhuang
2013-02-06 18:11 ` Stephen Warren
2013-02-07 1:15 ` jonghwa3.lee
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