time: Change k_clock clock_get() to use timespec64

struct timespec is not y2038 safe on 32 bit machines.  Replace uses of
struct timespec with struct timespec64 in the kernel.

The syscall interfaces themselves will be changed in a separate series.

Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: y2038@lists.linaro.org
Cc: john.stultz@linaro.org
Cc: arnd@arndb.de
Link: http://lkml.kernel.org/r/1490555058-4603-4-git-send-email-deepa.kernel@gmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

8 files changed, 41 insertions, 34 deletions

diff --git a/drivers/char/mmtimer.c b/drivers/char/mmtimer.c
index b708c85dc9c1..40d880b8c02f 100644
--- a/drivers/char/mmtimer.c
+++ b/drivers/char/mmtimer.c
@@ -478,13 +478,13 @@ static int sgi_clock_period;
 static struct timespec sgi_clock_offset;
 static int sgi_clock_period;
 
-static int sgi_clock_get(clockid_t clockid, struct timespec *tp)
+static int sgi_clock_get(clockid_t clockid, struct timespec64 *tp)
 {
 	u64 nsec;
 
 	nsec = rtc_time() * sgi_clock_period
 			+ sgi_clock_offset.tv_nsec;
-	*tp = ns_to_timespec(nsec);
+	*tp = ns_to_timespec64(nsec);
 	tp->tv_sec += sgi_clock_offset.tv_sec;
 	return 0;
 };
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 64aa189efe21..0688f3975da7 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -90,7 +90,7 @@ struct k_clock {
 	int (*clock_getres) (const clockid_t which_clock, struct timespec *tp);
 	int (*clock_set) (const clockid_t which_clock,
 			  const struct timespec *tp);
-	int (*clock_get) (const clockid_t which_clock, struct timespec * tp);
+	int (*clock_get) (const clockid_t which_clock, struct timespec64 *tp);
 	int (*clock_adj) (const clockid_t which_clock, struct timex *tx);
 	int (*timer_create) (struct k_itimer *timer);
 	int (*nsleep) (const clockid_t which_clock, int flags,
diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h
index 3617a78897bb..ddc229ff6d1e 100644
--- a/include/linux/timekeeping.h
+++ b/include/linux/timekeeping.h
@@ -258,6 +258,11 @@ static inline void timekeeping_clocktai(struct timespec *ts)
 	*ts = ktime_to_timespec(ktime_get_clocktai());
 }
 
+static inline void timekeeping_clocktai64(struct timespec64 *ts)
+{
+	*ts = ktime_to_timespec64(ktime_get_clocktai());
+}
+
 /*
  * RTC specific
  */
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index ce3a31e8eb36..944ca6e6f1c2 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -558,14 +558,14 @@ static int alarm_clock_getres(const clockid_t which_clock, struct timespec *tp)
  *
  * Provides the underlying alarm base time.
  */
-static int alarm_clock_get(clockid_t which_clock, struct timespec *tp)
+static int alarm_clock_get(clockid_t which_clock, struct timespec64 *tp)
 {
 	struct alarm_base *base = &alarm_bases[clock2alarm(which_clock)];
 
 	if (!alarmtimer_get_rtcdev())
 		return -EINVAL;
 
-	*tp = ktime_to_timespec(base->gettime());
+	*tp = ktime_to_timespec64(base->gettime());
 	return 0;
 }
 
diff --git a/kernel/time/posix-clock.c b/kernel/time/posix-clock.c
index e24008c098c6..fab6bd33155e 100644
--- a/kernel/time/posix-clock.c
+++ b/kernel/time/posix-clock.c
@@ -297,20 +297,17 @@ out:
 	return err;
 }
 
-static int pc_clock_gettime(clockid_t id, struct timespec *ts)
+static int pc_clock_gettime(clockid_t id, struct timespec64 *ts)
 {
 	struct posix_clock_desc cd;
-	struct timespec64 ts64;
 	int err;
 
 	err = get_clock_desc(id, &cd);
 	if (err)
 		return err;
 
-	if (cd.clk->ops.clock_gettime) {
-		err = cd.clk->ops.clock_gettime(cd.clk, &ts64);
-		*ts = timespec64_to_timespec(ts64);
-	}
+	if (cd.clk->ops.clock_gettime)
+		err = cd.clk->ops.clock_gettime(cd.clk, ts);
 	else
 		err = -EOPNOTSUPP;
 
diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index 76bea3a47d4b..082231cc7953 100644
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -261,7 +261,7 @@ static int cpu_clock_sample_group(const clockid_t which_clock,
 
 static int posix_cpu_clock_get_task(struct task_struct *tsk,
 				    const clockid_t which_clock,
-				    struct timespec *tp)
+				    struct timespec64 *tp)
 {
 	int err = -EINVAL;
 	u64 rtn;
@@ -275,13 +275,13 @@ static int posix_cpu_clock_get_task(struct task_struct *tsk,
 	}
 
 	if (!err)
-		*tp = ns_to_timespec(rtn);
+		*tp = ns_to_timespec64(rtn);
 
 	return err;
 }
 
 
-static int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp)
+static int posix_cpu_clock_get(const clockid_t which_clock, struct timespec64 *tp)
 {
 	const pid_t pid = CPUCLOCK_PID(which_clock);
 	int err = -EINVAL;
@@ -1374,7 +1374,7 @@ static int process_cpu_clock_getres(const clockid_t which_clock,
 	return posix_cpu_clock_getres(PROCESS_CLOCK, tp);
 }
 static int process_cpu_clock_get(const clockid_t which_clock,
-				 struct timespec *tp)
+				 struct timespec64 *tp)
 {
 	return posix_cpu_clock_get(PROCESS_CLOCK, tp);
 }
@@ -1399,7 +1399,7 @@ static int thread_cpu_clock_getres(const clockid_t which_clock,
 	return posix_cpu_clock_getres(THREAD_CLOCK, tp);
 }
 static int thread_cpu_clock_get(const clockid_t which_clock,
-				struct timespec *tp)
+				struct timespec64 *tp)
 {
 	return posix_cpu_clock_get(THREAD_CLOCK, tp);
 }
diff --git a/kernel/time/posix-stubs.c b/kernel/time/posix-stubs.c
index 95a1b1fc3968..0fbd0c5b95ca 100644
--- a/kernel/time/posix-stubs.c
+++ b/kernel/time/posix-stubs.c
@@ -64,14 +64,17 @@ SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
 SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
 		struct timespec __user *,tp)
 {
+	struct timespec64 kernel_tp64;
 	struct timespec kernel_tp;
 
 	switch (which_clock) {
-	case CLOCK_REALTIME: ktime_get_real_ts(&kernel_tp); break;
-	case CLOCK_MONOTONIC: ktime_get_ts(&kernel_tp); break;
-	case CLOCK_BOOTTIME: get_monotonic_boottime(&kernel_tp); break;
+	case CLOCK_REALTIME: ktime_get_real_ts64(&kernel_tp64); break;
+	case CLOCK_MONOTONIC: ktime_get_ts64(&kernel_tp64); break;
+	case CLOCK_BOOTTIME: get_monotonic_boottime64(&kernel_tp64); break;
 	default: return -EINVAL;
 	}
+
+	kernel_tp = timespec64_to_timespec(kernel_tp64);
 	if (copy_to_user(tp, &kernel_tp, sizeof (kernel_tp)))
 		return -EFAULT;
 	return 0;
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index f215ef792772..68170642c77c 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -204,9 +204,9 @@ static inline void unlock_timer(struct k_itimer *timr, unsigned long flags)
 }
 
 /* Get clock_realtime */
-static int posix_clock_realtime_get(clockid_t which_clock, struct timespec *tp)
+static int posix_clock_realtime_get(clockid_t which_clock, struct timespec64 *tp)
 {
-	ktime_get_real_ts(tp);
+	ktime_get_real_ts64(tp);
 	return 0;
 }
 
@@ -229,32 +229,32 @@ static int posix_clock_realtime_adj(const clockid_t which_clock,
 /*
  * Get monotonic time for posix timers
  */
-static int posix_ktime_get_ts(clockid_t which_clock, struct timespec *tp)
+static int posix_ktime_get_ts(clockid_t which_clock, struct timespec64 *tp)
 {
-	ktime_get_ts(tp);
+	ktime_get_ts64(tp);
 	return 0;
 }
 
 /*
  * Get monotonic-raw time for posix timers
  */
-static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec *tp)
+static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec64 *tp)
 {
-	getrawmonotonic(tp);
+	getrawmonotonic64(tp);
 	return 0;
 }
 
 
-static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec *tp)
+static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec64 *tp)
 {
-	*tp = current_kernel_time();
+	*tp = current_kernel_time64();
 	return 0;
 }
 
 static int posix_get_monotonic_coarse(clockid_t which_clock,
-						struct timespec *tp)
+						struct timespec64 *tp)
 {
-	*tp = get_monotonic_coarse();
+	*tp = get_monotonic_coarse64();
 	return 0;
 }
 
@@ -264,15 +264,15 @@ static int posix_get_coarse_res(const clockid_t which_clock, struct timespec *tp
 	return 0;
 }
 
-static int posix_get_boottime(const clockid_t which_clock, struct timespec *tp)
+static int posix_get_boottime(const clockid_t which_clock, struct timespec64 *tp)
 {
-	get_monotonic_boottime(tp);
+	get_monotonic_boottime64(tp);
 	return 0;
 }
 
-static int posix_get_tai(clockid_t which_clock, struct timespec *tp)
+static int posix_get_tai(clockid_t which_clock, struct timespec64 *tp)
 {
-	timekeeping_clocktai(tp);
+	timekeeping_clocktai64(tp);
 	return 0;
 }
 
@@ -1032,13 +1032,15 @@ SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
 		struct timespec __user *,tp)
 {
 	struct k_clock *kc = clockid_to_kclock(which_clock);
+	struct timespec64 kernel_tp64;
 	struct timespec kernel_tp;
 	int error;
 
 	if (!kc)
 		return -EINVAL;
 
-	error = kc->clock_get(which_clock, &kernel_tp);
+	error = kc->clock_get(which_clock, &kernel_tp64);
+	kernel_tp = timespec64_to_timespec(kernel_tp64);
 
 	if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp)))
 		error = -EFAULT;