linux-kernel - [PATCH 2/6] timekeeping: Introduce current_kernel

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Message-Id: <d50247eb518f3803901541df92938896530c8e24.1436511577.git.baolin.wang@linaro.org>
Date:	Wed, 15 Jul 2015 13:54:02 +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, mingo@...nel.org, peterz@...radead.org,
	linux-kernel@...r.kernel.org, baolin.wang@...aro.org,
	y2038@...ts.linaro.org
Subject: [PATCH 2/6] timekeeping: Introduce current_kernel_time64()

The current_kernel_time() is not year 2038 safe on 32bit systems
since it returns a timespec value. Introduce current_kernel_time64()
which returns a timespec64 value.

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 include/linux/timekeeping.h |    9 ++++++++-
 kernel/time/timekeeping.c   |    6 +++---
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h
index 3aa72e6..657ea03 100644
--- a/include/linux/timekeeping.h
+++ b/include/linux/timekeeping.h
@@ -18,10 +18,17 @@ extern int do_sys_settimeofday(const struct timespec *tv,
  * Kernel time accessors
  */
 unsigned long get_seconds(void);
-struct timespec current_kernel_time(void);
+struct timespec64 current_kernel_time64(void);
 /* does not take xtime_lock */
 struct timespec __current_kernel_time(void);
 
+static inline struct timespec current_kernel_time(void)
+{
+	struct timespec64 now = current_kernel_time64();
+
+	return timespec64_to_timespec(now);
+}
+
 /*
  * timespec based interfaces
  */
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index bca3667..2d58742 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1874,7 +1874,7 @@ struct timespec __current_kernel_time(void)
 	return timespec64_to_timespec(tk_xtime(tk));
 }
 
-struct timespec current_kernel_time(void)
+struct timespec64 current_kernel_time64(void)
 {
 	struct timekeeper *tk = &tk_core.timekeeper;
 	struct timespec64 now;
@@ -1886,9 +1886,9 @@ struct timespec current_kernel_time(void)
 		now = tk_xtime(tk);
 	} while (read_seqcount_retry(&tk_core.seq, seq));
 
-	return timespec64_to_timespec(now);
+	return now;
 }
-EXPORT_SYMBOL(current_kernel_time);
+EXPORT_SYMBOL(current_kernel_time64);
 
 struct timespec64 get_monotonic_coarse64(void)
 {
-- 
1.7.9.5

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