posix-timers: Use clock_get_ktime() in common_timer_get()

Now, when the clock_get_ktime() callback exists, the suboptimal
timespec64-based conversion can be removed from common_timer_get().

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Co-developed-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20191112012724.250792-11-dima@arista.com

diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index a1f6b96..fe1de4f 100644 (file)
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -665,7 +665,6 @@ void common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting)
 {
        const struct k_clock *kc = timr->kclock;
        ktime_t now, remaining, iv;
-       struct timespec64 ts64;
        bool sig_none;
 
        sig_none = timr->it_sigev_notify == SIGEV_NONE;
@@ -683,12 +682,7 @@ void common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting)
                        return;
        }
 
-       /*
-        * The timespec64 based conversion is suboptimal, but it's not
-        * worth to implement yet another callback.
-        */
-       kc->clock_get_timespec(timr->it_clock, &ts64);
-       now = timespec64_to_ktime(ts64);
+       now = kc->clock_get_ktime(timr->it_clock);
 
        /*
         * When a requeue is pending or this is a SIGEV_NONE timer move the