linux-kernel - [PATCH 2/2] ntp:Change the type of time_reftime to time64_t and replace get_seconds with __ktime_get_real

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Date:	Sun, 13 Dec 2015 12:24:19 +0800
From:	DengChao <chao.deng@...aro.org>
To:	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	john.stultz@...aro.org
Cc:	chao.deng@...aro.org
Subject: [PATCH 2/2] ntp:Change the type of time_reftime to time64_t and replace get_seconds with __ktime_get_real_seconds

The type of static variant "time_reftime" and the call of get_seconds
in ntp are both not y2038 safe.
So change the type of time_reftime to time64_t and replace get_seconds
with __ktime_get_real_seconds.
The local variant "secs" in ntp_update_offset represents seconds between
now and last ntp adjustment, it seems impossible that this time will last
more than 68 years, so keep its type as "long".

Reviewed-by: John Stultz <john.stultz@...aro.org>
Signed-off-by: DengChao <chao.deng@...aro.org>
---
 kernel/time/ntp.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 149cc80..f9b9d8e 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -18,6 +18,8 @@
 #include <linux/rtc.h>
 
 #include "ntp_internal.h"
+#include "timekeeping_internal.h"
+
 
 /*
  * NTP timekeeping variables:
@@ -70,7 +72,7 @@ static long			time_esterror = NTP_PHASE_LIMIT;
 static s64			time_freq;
 
 /* time at last adjustment (secs):					*/
-static long			time_reftime;
+static time64_t		time_reftime;
 
 static long			time_adjust;
 
@@ -311,11 +313,11 @@ static void ntp_update_offset(long offset)
 	 * Select how the frequency is to be controlled
 	 * and in which mode (PLL or FLL).
 	 */
-	secs = get_seconds() - time_reftime;
+	secs = (long)(__ktime_get_real_seconds() - time_reftime);
 	if (unlikely(time_status & STA_FREQHOLD))
 		secs = 0;
 
-	time_reftime = get_seconds();
+	time_reftime = __ktime_get_real_seconds();
 
 	offset64    = offset;
 	freq_adj    = ntp_update_offset_fll(offset64, secs);
@@ -590,7 +592,7 @@ static inline void process_adj_status(struct timex *txc, struct timespec64 *ts)
 	 * reference time to current time.
 	 */
 	if (!(time_status & STA_PLL) && (txc->status & STA_PLL))
-		time_reftime = get_seconds();
+		time_reftime = __ktime_get_real_seconds();
 
 	/* only set allowed bits */
 	time_status &= STA_RONLY;
-- 
1.9.1

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