linux-kernel - [PATCH 5/5] timekeeping: Add more coarse clocktai/boottime interfaces

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Message-Id: <20180427134016.2525989-6-arnd@arndb.de>
Date:   Fri, 27 Apr 2018 15:40:16 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, Stephen Boyd <sboyd@...nel.org>,
        John Stultz <john.stultz@...aro.org>, y2038@...ts.linaro.org,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 5/5] timekeeping: Add more coarse clocktai/boottime interfaces

The set of APIs we provide has a few holes for coarse times, e.g. we
provide ktime_get_coarse_boottime() and ktime_get_boottime_ts64(),
but not the combination of the two.

This adds four new functions:

ktime_get_coarse_boottime_ts64()
ktime_get_boottime_seconds()
ktime_get_coarse_clocktai_ts64()
ktime_get_clocktai_seconds()

to fill in some of the missing pieces. I have missed only the
ktime_get_boottime_seconds() accessor in a few occasions in
the past, but it seems better to just provide all four together,
as there is very little cost to having them.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 include/linux/timekeeping.h | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h
index 42f71f4b658a..86bc2026efce 100644
--- a/include/linux/timekeeping.h
+++ b/include/linux/timekeeping.h
@@ -137,18 +137,40 @@ extern u64 ktime_get_boot_fast_ns(void);
 extern u64 ktime_get_real_fast_ns(void);
 
 /*
- * timespec64 interfaces utilizing the ktime based ones
+ * timespec64/time64_t interfaces utilizing the ktime based ones
+ * for API completeness, these could be implemented more efficiently
+ * if needed.
  */
 static inline void ktime_get_boottime_ts64(struct timespec64 *ts)
 {
 	*ts = ktime_to_timespec64(ktime_get_boottime());
 }
 
+static inline void ktime_get_coarse_boottime_ts64(struct timespec64 *ts)
+{
+	*ts = ktime_to_timespec64(ktime_get_coarse_boottime());
+}
+
+static inline time64_t ktime_get_boottime_seconds(void)
+{
+	return ktime_divns(ktime_get_coarse_boottime(), NSEC_PER_SEC);
+}
+
 static inline void ktime_get_clocktai_ts64(struct timespec64 *ts)
 {
 	*ts = ktime_to_timespec64(ktime_get_clocktai());
 }
 
+static inline void ktime_get_coarse_clocktai_ts64(struct timespec64 *ts)
+{
+	*ts = ktime_to_timespec64(ktime_get_coarse_clocktai());
+}
+
+static inline time64_t ktime_get_clocktai_seconds(void)
+{
+	return ktime_divns(ktime_get_coarse_clocktai(), NSEC_PER_SEC);
+}
+
 /*
  * RTC specific
  */
-- 
2.9.0