posix-timers: Add active flag to k_itimer

Keep track of the activation state of posix timers. This is a preparatory
change for making common_timer_get() usable by both hrtimer and alarm timer
implementations.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20170530211656.967783982@linutronix.de

diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 771e5f7..667095d 100644 (file)
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -59,6 +59,7 @@ struct cpu_timer_list {
  * @kclock:            Pointer to the k_clock struct handling this timer
  * @it_clock:          The posix timer clock id
  * @it_id:             The posix timer id for identifying the timer
+ * @it_active:         Marker that timer is active
  * @it_overrun:                The overrun counter for pending signals
  * @it_overrun_last:   The overrun at the time of the last delivered signal
  * @it_requeue_pending:        Indicator that timer waits for being requeued on
@@ -79,6 +80,7 @@ struct k_itimer {
        const struct k_clock    *kclock;
        clockid_t               it_clock;
        timer_t                 it_id;
+       int                     it_active;
        int                     it_overrun;
        int                     it_overrun_last;
        int                     it_requeue_pending;

diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index b12582a..795215b 100644 (file)
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -316,6 +316,7 @@ void posixtimer_rearm(struct siginfo *info)
        if (timr->it_requeue_pending == info->si_sys_private) {
                timr->kclock->timer_rearm(timr);
 
+               timr->it_active = 1;
                timr->it_overrun_last = timr->it_overrun;
                timr->it_overrun = -1;
                ++timr->it_requeue_pending;
@@ -371,6 +372,7 @@ static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
        timr = container_of(timer, struct k_itimer, it.real.timer);
        spin_lock_irqsave(&timr->it_lock, flags);
 
+       timr->it_active = 0;
        if (timr->it_interval != 0)
                si_private = ++timr->it_requeue_pending;
 
@@ -418,6 +420,7 @@ static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
                                                timr->it_interval);
                        ret = HRTIMER_RESTART;
                        ++timr->it_requeue_pending;
+                       timr->it_active = 1;
                }
        }
 
@@ -737,7 +740,8 @@ common_timer_set(struct k_itimer *timr, int flags,
        if (hrtimer_try_to_cancel(timer) < 0)
                return TIMER_RETRY;
 
-       timr->it_requeue_pending = (timr->it_requeue_pending + 2) & 
+       timr->it_active = 0;
+       timr->it_requeue_pending = (timr->it_requeue_pending + 2) &
                ~REQUEUE_PENDING;
        timr->it_overrun_last = 0;
 
@@ -763,6 +767,7 @@ common_timer_set(struct k_itimer *timr, int flags,
                return 0;
        }
 
+       timr->it_active = 1;
        hrtimer_start_expires(timer, mode);
        return 0;
 }
@@ -821,6 +826,7 @@ static int common_timer_del(struct k_itimer *timer)
 
        if (hrtimer_try_to_cancel(&timer->it.real.timer) < 0)
                return TIMER_RETRY;
+       timer->it_active = 0;
        return 0;
 }