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From: Deepa Dinamani <deepa.kernel@gmail.com>
To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>,
	Thomas Gleixner <tglx@linutronix.de>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	y2038@lists.linaro.org, John Stultz <john.stultz@linaro.org>
Subject: [PATCH 15/21] time: Add time64_to_tm()
Date: Wed,  8 Jun 2016 22:04:59 -0700
Message-ID: <1465448705-25055-16-git-send-email-deepa.kernel@gmail.com> (raw)
In-Reply-To: <1465448705-25055-1-git-send-email-deepa.kernel@gmail.com>

time_to_tm() takes time_t as an argument.
time_t is not y2038 safe.
Add time64_to_tm() that takes time64_t as an argument
which is y2038 safe.
The plan is to eventually replace all calls to time_to_tm()
by time64_to_tm().

Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
---
 include/linux/time.h   | 15 ++++++++++++++-
 kernel/time/timeconv.c | 11 ++++++-----
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/include/linux/time.h b/include/linux/time.h
index 297f09f..4cea09d 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -205,7 +205,20 @@ struct tm {
 	int tm_yday;
 };
 
-void time_to_tm(time_t totalsecs, int offset, struct tm *result);
+void time64_to_tm(time64_t totalsecs, int offset, struct tm *result);
+
+/**
+ * time_to_tm - converts the calendar time to local broken-down time
+ *
+ * @totalsecs	the number of seconds elapsed since 00:00:00 on January 1, 1970,
+ *		Coordinated Universal Time (UTC).
+ * @offset	offset seconds adding to totalsecs.
+ * @result	pointer to struct tm variable to receive broken-down time
+ */
+static inline void time_to_tm(time_t totalsecs, int offset, struct tm *result)
+{
+	time64_to_tm(totalsecs, offset, result);
+}
 
 /**
  * timespec_to_ns - Convert timespec to nanoseconds
diff --git a/kernel/time/timeconv.c b/kernel/time/timeconv.c
index 86628e7..7142580 100644
--- a/kernel/time/timeconv.c
+++ b/kernel/time/timeconv.c
@@ -67,20 +67,21 @@ static const unsigned short __mon_yday[2][13] = {
 #define SECS_PER_DAY	(SECS_PER_HOUR * 24)
 
 /**
- * time_to_tm - converts the calendar time to local broken-down time
+ * time64_to_tm - converts the calendar time to local broken-down time
  *
  * @totalsecs	the number of seconds elapsed since 00:00:00 on January 1, 1970,
  *		Coordinated Universal Time (UTC).
  * @offset	offset seconds adding to totalsecs.
  * @result	pointer to struct tm variable to receive broken-down time
  */
-void time_to_tm(time_t totalsecs, int offset, struct tm *result)
+void time64_to_tm(time64_t totalsecs, int offset, struct tm *result)
 {
 	long days, rem, y;
+	int remainder;
 	const unsigned short *ip;
 
-	days = totalsecs / SECS_PER_DAY;
-	rem = totalsecs % SECS_PER_DAY;
+	days = div_s64_rem(totalsecs, SECS_PER_DAY, &remainder);
+	rem = remainder;
 	rem += offset;
 	while (rem < 0) {
 		rem += SECS_PER_DAY;
@@ -124,4 +125,4 @@ void time_to_tm(time_t totalsecs, int offset, struct tm *result)
 	result->tm_mon = y;
 	result->tm_mday = days + 1;
 }
-EXPORT_SYMBOL(time_to_tm);
+EXPORT_SYMBOL(time64_to_tm);
-- 
1.9.1

  parent reply index

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-09  5:04 [PATCH 00/21] Delete CURRENT_TIME and CURRENT_TIME_SEC macros Deepa Dinamani
2016-06-09  5:04 ` [PATCH 01/21] fs: Replace CURRENT_TIME_SEC with current_fs_time() Deepa Dinamani
2016-06-09  7:35   ` Jan Kara
2016-06-09 19:15     ` Linus Torvalds
2016-06-09 20:41       ` Deepa Dinamani
2016-06-09 12:31   ` Bob Copeland
2016-06-10 22:21   ` Arnd Bergmann
2016-06-11  5:03     ` Deepa Dinamani
2016-06-11 20:55       ` Arnd Bergmann
2016-06-09  5:04 ` [PATCH 02/21] fs: ext4: Use current_fs_time() for inode timestamps Deepa Dinamani
2016-06-09 18:45   ` Linus Torvalds
2016-06-09 18:55     ` Linus Torvalds
2016-06-10 22:19     ` [Y2038] " Arnd Bergmann
2016-06-14 17:55       ` Deepa Dinamani
2016-06-14 20:59         ` Arnd Bergmann
2016-06-09  5:04 ` [PATCH 03/21] fs: ubifs: " Deepa Dinamani
2016-06-09  5:04 ` [PATCH 05/21] fs: jfs: Replace CURRENT_TIME_SEC by current_fs_time() Deepa Dinamani
2016-06-09  5:04 ` [PATCH 06/21] fs: udf: Replace CURRENT_TIME with current_fs_time() Deepa Dinamani
2016-06-09  7:41   ` Jan Kara
2016-06-10  0:53     ` Deepa Dinamani
2016-06-09  5:04 ` [PATCH 07/21] fs: cifs: Replace CURRENT_TIME by current_fs_time() Deepa Dinamani
2016-06-09  5:04 ` [PATCH 08/21] fs: cifs: Replace CURRENT_TIME with ktime_get_real_ts() Deepa Dinamani
2016-06-09  5:04 ` [PATCH 09/21] fs: cifs: Replace CURRENT_TIME by get_seconds Deepa Dinamani
2016-06-09  5:04 ` [PATCH 10/21] fs: f2fs: Use ktime_get_real_seconds for sit_info times Deepa Dinamani
2016-06-09  5:04 ` [PATCH 11/21] drivers: staging: lustre: Replace CURRENT_TIME with current_fs_time() Deepa Dinamani
2016-06-11  0:36   ` [lustre-devel] " James Simmons
2016-06-11  1:53     ` Andreas Dilger
2016-06-09  5:04 ` [PATCH 12/21] block: rbd: Replace non inode " Deepa Dinamani
2016-06-09  5:04 ` [PATCH 13/21] fs: ocfs2: Use time64_t to represent orphan scan times Deepa Dinamani
2016-06-09  5:04 ` [PATCH 14/21] fs: ocfs2: Replace CURRENT_TIME with ktime_get_real_seconds() Deepa Dinamani
2016-06-09  5:04 ` Deepa Dinamani [this message]
2016-06-14 21:18   ` [PATCH 15/21] time: Add time64_to_tm() John Stultz
2016-06-15 17:44     ` Deepa Dinamani
2016-06-17 20:52       ` John Stultz
2016-06-17 20:59         ` Deepa Dinamani
2016-06-17 21:06           ` Arnd Bergmann
2016-06-09  5:05 ` [PATCH 16/21] fnic: Use time64_t to represent trace timestamps Deepa Dinamani
2016-06-09  5:05 ` [PATCH 17/21] audit: Use timespec64 to represent audit timestamps Deepa Dinamani
2016-06-09 14:31   ` Steve Grubb
2016-06-09 23:59     ` Richard Guy Briggs
2016-06-10  0:19       ` Steve Grubb
2016-06-10  1:44         ` Richard Guy Briggs
2016-06-15 21:23       ` Paul Moore
2016-06-10  0:45     ` Deepa Dinamani
2016-06-09  5:05 ` [PATCH 18/21] fs: nfs: Make nfs boot time y2038 safe Deepa Dinamani
2016-06-09 19:23   ` Trond Myklebust
2016-06-09 21:10     ` Deepa Dinamani
2016-06-10 13:12       ` Anna Schumaker
2016-06-10 14:02         ` Trond Myklebust
2016-06-09  5:05 ` [PATCH 19/21] libceph: Remove CURRENT_TIME references Deepa Dinamani
2016-06-09  5:05 ` [PATCH 20/21] libceph: Replace CURRENT_TIME with ktime_get_real_ts Deepa Dinamani
2016-06-09  5:05 ` [PATCH 21/21] time: Delete CURRENT_TIME_SEC and CURRENT_TIME macro Deepa Dinamani
2016-06-14 21:20   ` John Stultz
2016-06-09  7:51 ` [PATCH 00/21] Delete CURRENT_TIME and CURRENT_TIME_SEC macros Felipe Balbi

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