linux-kernel - [PATCH 03/11] time/hrtimer:Introduce hrtimer_get_res64() with timespec64 type for getting the timer resolution

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Date:	Mon, 20 Apr 2015 13:57:31 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	tglx@...utronix.de
Cc:	arnd@...db.de, john.stultz@...aro.org, heenasirwani@...il.com,
	pang.xunlei@...aro.org, peterz@...radead.org,
	rafael.j.wysocki@...el.com, gregkh@...uxfoundation.org,
	richardcochran@...il.com, benh@...nel.crashing.org,
	paulus@...ba.org, mpe@...erman.id.au, schwidefsky@...ibm.com,
	heiko.carstens@...ibm.com, linux390@...ibm.com, rth@...ddle.net,
	riel@...hat.com, cl@...ux.com, tj@...nel.org, fweisbec@...il.com,
	ahh@...gle.com, pjt@...gle.com, linuxppc-dev@...ts.ozlabs.org,
	linux-s390@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	baolin.wang@...aro.org, y2038@...ts.linaro.org
Subject: [PATCH 03/11] time/hrtimer:Introduce hrtimer_get_res64() with timespec64 type for getting the timer resolution

This patch introduces hrtimer_get_res64() function to get the timer resolution
with timespec64 type, and moves the hrtimer_get_res() function into
include/linux/hrtimer.h as a 'static inline' helper that just calls hrtimer_get_res64.

It is ready for 2038 year when getting the timer resolution by hrtimer_get_res64() function
with timespec64 type, and it is convenient to delete the old hrtimer_get_res() function
in hrtimer.h file.

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 include/linux/hrtimer.h |   12 +++++++++++-
 kernel/time/hrtimer.c   |   10 +++++-----
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 05f6df1..ee8ed44 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -383,7 +383,17 @@ static inline int hrtimer_restart(struct hrtimer *timer)
 
 /* Query timers: */
 extern ktime_t hrtimer_get_remaining(const struct hrtimer *timer);
-extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp);
+extern int hrtimer_get_res64(const clockid_t which_clock,
+			     struct timespec64 *tp);
+
+static inline int hrtimer_get_res(const clockid_t which_clock,
+				  struct timespec *tp)
+{
+	struct timespec64 *ts64;
+
+	*ts64 = timespec_to_timespec64(*tp);
+	return hrtimer_get_res64(which_clock, ts64);
+}
 
 extern ktime_t hrtimer_get_next_event(void);
 
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index bee0c1f..508d936 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1175,24 +1175,24 @@ void hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
 EXPORT_SYMBOL_GPL(hrtimer_init);
 
 /**
- * hrtimer_get_res - get the timer resolution for a clock
+ * hrtimer_get_res64 - get the timer resolution for a clock
  * @which_clock: which clock to query
- * @tp:		 pointer to timespec variable to store the resolution
+ * @tp:		 pointer to timespec64 variable to store the resolution
  *
  * Store the resolution of the clock selected by @which_clock in the
  * variable pointed to by @tp.
  */
-int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp)
+int hrtimer_get_res64(const clockid_t which_clock, struct timespec64 *tp)
 {
 	struct hrtimer_cpu_base *cpu_base;
 	int base = hrtimer_clockid_to_base(which_clock);
 
 	cpu_base = raw_cpu_ptr(&hrtimer_bases);
-	*tp = ktime_to_timespec(cpu_base->clock_base[base].resolution);
+	*tp = ktime_to_timespec64(cpu_base->clock_base[base].resolution);
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(hrtimer_get_res);
+EXPORT_SYMBOL_GPL(hrtimer_get_res64);
 
 static void __run_hrtimer(struct hrtimer *timer, ktime_t *now)
 {
-- 
1.7.9.5

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