time: Change k_clock timer_set() and timer_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.

struct itimerspec internally uses struct timespec.  Use struct itimerspec64
which uses struct timespec64.

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/1490555058-4603-7-git-send-email-deepa.kernel@gmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 16 insertions, 12 deletions

diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index 2cd4428c81f0..441064d1216f 100644
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -562,7 +562,7 @@ static int cpu_timer_sample_group(const clockid_t which_clock,
  * and try again.  (This happens when the timer is in the middle of firing.)
  */
 static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,
-			       struct itimerspec *new, struct itimerspec *old)
+			       struct itimerspec64 *new, struct itimerspec64 *old)
 {
 	unsigned long flags;
 	struct sighand_struct *sighand;
@@ -572,7 +572,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,
 
 	WARN_ON_ONCE(p == NULL);
 
-	new_expires = timespec_to_ns(&new->it_value);
+	new_expires = timespec64_to_ns(&new->it_value);
 
 	/*
 	 * Protect against sighand release/switch in exit/exec and p->cpu_timers
@@ -633,7 +633,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,
 			bump_cpu_timer(timer, val);
 			if (val < timer->it.cpu.expires) {
 				old_expires = timer->it.cpu.expires - val;
-				old->it_value = ns_to_timespec(old_expires);
+				old->it_value = ns_to_timespec64(old_expires);
 			} else {
 				old->it_value.tv_nsec = 1;
 				old->it_value.tv_sec = 0;
@@ -671,7 +671,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,
 	 * Install the new reload setting, and
 	 * set up the signal and overrun bookkeeping.
 	 */
-	timer->it.cpu.incr = timespec_to_ns(&new->it_interval);
+	timer->it.cpu.incr = timespec64_to_ns(&new->it_interval);
 
 	/*
 	 * This acts as a modification timestamp for the timer,
@@ -695,12 +695,12 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,
 	ret = 0;
  out:
 	if (old)
-		old->it_interval = ns_to_timespec(old_incr);
+		old->it_interval = ns_to_timespec64(old_incr);
 
 	return ret;
 }
 
-static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
+static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec64 *itp)
 {
 	u64 now;
 	struct task_struct *p = timer->it.cpu.task;
@@ -710,7 +710,7 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
 	/*
 	 * Easy part: convert the reload time.
 	 */
-	itp->it_interval = ns_to_timespec(timer->it.cpu.incr);
+	itp->it_interval = ns_to_timespec64(timer->it.cpu.incr);
 
 	if (timer->it.cpu.expires == 0) {	/* Timer not armed at all.  */
 		itp->it_value.tv_sec = itp->it_value.tv_nsec = 0;
@@ -739,7 +739,7 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
 			 * Call the timer disarmed, nothing else to do.
 			 */
 			timer->it.cpu.expires = 0;
-			itp->it_value = ns_to_timespec(timer->it.cpu.expires);
+			itp->it_value = ns_to_timespec64(timer->it.cpu.expires);
 			return;
 		} else {
 			cpu_timer_sample_group(timer->it_clock, p, &now);
@@ -748,7 +748,7 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
 	}
 
 	if (now < timer->it.cpu.expires) {
-		itp->it_value = ns_to_timespec(timer->it.cpu.expires - now);
+		itp->it_value = ns_to_timespec64(timer->it.cpu.expires - now);
 	} else {
 		/*
 		 * The timer should have expired already, but the firing
@@ -1221,6 +1221,7 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
 static int do_cpu_nanosleep(const clockid_t which_clock, int flags,
 			    struct timespec *rqtp, struct itimerspec *it)
 {
+	struct itimerspec64 it64;
 	struct k_itimer timer;
 	int error;
 
@@ -1234,13 +1235,14 @@ static int do_cpu_nanosleep(const clockid_t which_clock, int flags,
 	error = posix_cpu_timer_create(&timer);
 	timer.it_process = current;
 	if (!error) {
-		static struct itimerspec zero_it;
+		static struct itimerspec64 zero_it;
 
 		memset(it, 0, sizeof *it);
 		it->it_value = *rqtp;
 
 		spin_lock_irq(&timer.it_lock);
-		error = posix_cpu_timer_set(&timer, flags, it, NULL);
+		it64 = itimerspec_to_itimerspec64(it);
+		error = posix_cpu_timer_set(&timer, flags, &it64, NULL);
 		if (error) {
 			spin_unlock_irq(&timer.it_lock);
 			return error;
@@ -1270,7 +1272,9 @@ static int do_cpu_nanosleep(const clockid_t which_clock, int flags,
 		 * We were interrupted by a signal.
 		 */
 		*rqtp = ns_to_timespec(timer.it.cpu.expires);
-		error = posix_cpu_timer_set(&timer, 0, &zero_it, it);
+		it64 = itimerspec_to_itimerspec64(it);
+		error = posix_cpu_timer_set(&timer, 0, &zero_it, &it64);
+		*it = itimerspec64_to_itimerspec(&it64);
 		if (!error) {
 			/*
 			 * Timer is now unarmed, deletion can not fail.