[PATCH 5/7] Change k_clock clock_set() to use timespec64

[Deepa Dinamani <deepa.kernel@gmail.com>]

struct timespec is not y2038 safe. The plan is to
get rid of all uses of timespec internally in the
kernel. Replace uses of timespec with timespec64.
The syscall interfaces themselves will be changed
in a separate series.

Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
---
 drivers/char/mmtimer.c         |  2 +-
 include/linux/posix-timers.h   |  2 +-
 kernel/time/posix-clock.c      |  5 ++---
 kernel/time/posix-cpu-timers.c |  2 +-
 kernel/time/posix-timers.c     | 11 +++++------
 5 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/char/mmtimer.c b/drivers/char/mmtimer.c
index 79d8ada..ba1b892 100644
--- a/drivers/char/mmtimer.c
+++ b/drivers/char/mmtimer.c
@@ -489,7 +489,7 @@ static int sgi_clock_get(clockid_t clockid, struct timespec64 *tp)
 	return 0;
 };
 
-static int sgi_clock_set(const clockid_t clockid, const struct timespec *tp)
+static int sgi_clock_set(const clockid_t clockid, const struct timespec64 *tp)
 {
 
 	u64 nsec;
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 2555d1c..249429c 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -89,7 +89,7 @@ struct k_itimer {
 struct k_clock {
 	int (*clock_getres) (const clockid_t which_clock, struct timespec64 *tp);
 	int (*clock_set) (const clockid_t which_clock,
-			  const struct timespec *tp);
+			  const struct timespec64 *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);
diff --git a/kernel/time/posix-clock.c b/kernel/time/posix-clock.c
index d5a4bec..6378fc6 100644
--- a/kernel/time/posix-clock.c
+++ b/kernel/time/posix-clock.c
@@ -335,10 +335,9 @@ static int pc_clock_getres(clockid_t id, struct timespec64 *ts)
 	return err;
 }
 
-static int pc_clock_settime(clockid_t id, const struct timespec *ts)
+static int pc_clock_settime(clockid_t id, const struct timespec64 *ts)
 {
 	struct posix_clock_desc cd;
-	struct timespec64 ts64 = timespec_to_timespec64(*ts);
 	int err;
 
 	err = get_clock_desc(id, &cd);
@@ -351,7 +350,7 @@ static int pc_clock_settime(clockid_t id, const struct timespec *ts)
 	}
 
 	if (cd.clk->ops.clock_settime)
-		err = cd.clk->ops.clock_settime(cd.clk, &ts64);
+		err = cd.clk->ops.clock_settime(cd.clk, ts);
 	else
 		err = -EOPNOTSUPP;
 out:
diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index 42ca205..0db0e16 100644
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -135,7 +135,7 @@ posix_cpu_clock_getres(const clockid_t which_clock, struct timespec64 *tp)
 }
 
 static int
-posix_cpu_clock_set(const clockid_t which_clock, const struct timespec *tp)
+posix_cpu_clock_set(const clockid_t which_clock, const struct timespec64 *tp)
 {
 	/*
 	 * You can never reset a CPU clock, but we check for other errors
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index a314a63..6c09f87 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -212,12 +212,9 @@ static int posix_clock_realtime_get(clockid_t which_clock, struct timespec64 *tp
 
 /* Set clock_realtime */
 static int posix_clock_realtime_set(const clockid_t which_clock,
-				    const struct timespec *tp)
+				    const struct timespec64 *tp)
 {
-	struct timespec64 tp64;
-
-	tp64 = timespec_to_timespec64(*tp);
-	return do_sys_settimeofday64(&tp64, NULL);
+	return do_sys_settimeofday64(tp, NULL);
 }
 
 static int posix_clock_realtime_adj(const clockid_t which_clock,
@@ -1018,14 +1015,16 @@ SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
 {
 	struct k_clock *kc = clockid_to_kclock(which_clock);
 	struct timespec new_tp;
+	struct timespec64 new_tp64;
 
 	if (!kc || !kc->clock_set)
 		return -EINVAL;
 
 	if (copy_from_user(&new_tp, tp, sizeof (*tp)))
 		return -EFAULT;
+	new_tp64 = timespec_to_timespec64(new_tp);
 
-	return kc->clock_set(which_clock, &new_tp);
+	return kc->clock_set(which_clock, &new_tp64);
 }
 
 SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
-- 
2.7.4