[tip:timers/core] alarmtimer: Switch over to generic set/get/rearm routine

tip-bot for Thomas Gleixner
2017-06-05T08:29:49Z

Commit-ID: f2c45807d3992fe0f173f34af9c347d907c31686
Gitweb: http://git.kernel.org/tip/f2c45807d3992fe0f173f34af9c347d907c31686
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Tue, 30 May 2017 23:15:59 +0200
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Sun, 4 Jun 2017 15:40:32 +0200

alarmtimer: Switch over to generic set/get/rearm routine

All required callbacks are in place. Switch the alarm timer based posix
interval timer callbacks to the common implementation and remove the
incorrect private implementation.

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/20170530211657.825471962@linutronix.de

---
kernel/time/alarmtimer.c | 121 +++++++--------------------------------------
kernel/time/posix-timers.c | 12 ++---
kernel/time/posix-timers.h | 6 +++
3 files changed, 29 insertions(+), 110 deletions(-)

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index c618a44..d8a7a7e 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -515,20 +515,26 @@ static enum alarmtimer_type clock2alarm(clockid_t clockid)
static enum alarmtimer_restart alarm_handle_timer(struct alarm *alarm,
ktime_t now)
{
- unsigned long flags;
struct k_itimer *ptr = container_of(alarm, struct k_itimer,
- it.alarm.alarmtimer);
+ it.alarm.alarmtimer);
enum alarmtimer_restart result = ALARMTIMER_NORESTART;
+ unsigned long flags;
+ int si_private = 0;

spin_lock_irqsave(&ptr->it_lock, flags);
- if ((ptr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) {
- if (posix_timer_event(ptr, 0))
- ptr->it_overrun++;
- }

- /* Re-add periodic timers */
- if (ptr->it_interval) {
- ptr->it_overrun += alarm_forward(alarm, now, ptr->it_interval);
+ ptr->it_active = 0;
+ if (ptr->it_interval)
+ si_private = ++ptr->it_requeue_pending;
+
+ if (posix_timer_event(ptr, si_private) && ptr->it_interval) {
+ /*
+ * Handle ignored signals and rearm the timer. This will go
+ * away once we handle ignored signals proper.
+ */
+ ptr->it_overrun += alarm_forward_now(alarm, ptr->it_interval);
+ ++ptr->it_requeue_pending;
+ ptr->it_active = 1;
result = ALARMTIMER_RESTART;
}
spin_unlock_irqrestore(&ptr->it_lock, flags);
@@ -659,97 +665,6 @@ static int alarm_timer_create(struct k_itimer *new_timer)
}

/**
- * alarm_timer_get - posix timer_get interface
- * @timr: k_itimer pointer
- * @cur_setting: itimerspec data to fill
- *
- * Copies out the current itimerspec data
- */
-static void alarm_timer_get(struct k_itimer *timr,
- struct itimerspec64 *cur_setting)
-{
- ktime_t relative_expiry_time =
- alarm_expires_remaining(&(timr->it.alarm.alarmtimer));
-
- if (ktime_to_ns(relative_expiry_time) > 0) {
- cur_setting->it_value = ktime_to_timespec64(relative_expiry_time);
- } else {
- cur_setting->it_value.tv_sec = 0;
- cur_setting->it_value.tv_nsec = 0;
- }
-
- cur_setting->it_interval = ktime_to_timespec64(timr->it_interval);
-}
-
-/**
- * alarm_timer_del - posix timer_del interface
- * @timr: k_itimer pointer to be deleted
- *
- * Cancels any programmed alarms for the given timer.
- */
-static int alarm_timer_del(struct k_itimer *timr)
-{
- if (!rtcdev)
- return -ENOTSUPP;
-
- if (alarm_try_to_cancel(&timr->it.alarm.alarmtimer) < 0)
- return TIMER_RETRY;
-
- return 0;
-}
-
-/**
- * alarm_timer_set - posix timer_set interface
- * @timr: k_itimer pointer to be deleted
- * @flags: timer flags
- * @new_setting: itimerspec to be used
- * @old_setting: itimerspec being replaced
- *
- * Sets the timer to new_setting, and starts the timer.
- */
-static int alarm_timer_set(struct k_itimer *timr, int flags,
- struct itimerspec64 *new_setting,
- struct itimerspec64 *old_setting)
-{
- ktime_t exp;
-
- if (!rtcdev)
- return -ENOTSUPP;
-
- if (flags & ~TIMER_ABSTIME)
- return -EINVAL;
-
- if (old_setting)
- alarm_timer_get(timr, old_setting);
-
- /* If the timer was already set, cancel it */
- if (alarm_try_to_cancel(&timr->it.alarm.alarmtimer) < 0)
- return TIMER_RETRY;
-
- /* start the timer */
- timr->it_interval = timespec64_to_ktime(new_setting->it_interval);
-
- /*
- * Rate limit to the tick as a hot fix to prevent DOS. Will be
- * mopped up later.
- */
- if (timr->it_interval < TICK_NSEC)
- timr->it_interval = TICK_NSEC;
-
- exp = timespec64_to_ktime(new_setting->it_value);
- /* Convert (if necessary) to absolute time */
- if (flags != TIMER_ABSTIME) {
- ktime_t now;
-
- now = alarm_bases[timr->it.alarm.alarmtimer.type].gettime();
- exp = ktime_add_safe(now, exp);
- }
-
- alarm_start(&timr->it.alarm.alarmtimer, exp);
- return 0;
-}
-
-/**
* alarmtimer_nsleep_wakeup - Wakeup function for alarm_timer_nsleep
* @alarm: ptr to alarm that fired
*
@@ -926,9 +841,9 @@ const struct k_clock alarm_clock = {
.clock_getres = alarm_clock_getres,
.clock_get = alarm_clock_get,
.timer_create = alarm_timer_create,
- .timer_set = alarm_timer_set,
- .timer_del = alarm_timer_del,
- .timer_get = alarm_timer_get,
+ .timer_set = common_timer_set,
+ .timer_del = common_timer_del,
+ .timer_get = common_timer_get,
.timer_arm = alarm_timer_arm,
.timer_rearm = alarm_timer_rearm,
.timer_forward = alarm_timer_forward,
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 8acc9ee..6e7a70b1 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -637,8 +637,7 @@ static int common_hrtimer_forward(struct k_itimer *timr, ktime_t now)
* it is the same as a requeue pending timer WRT to what we should
* report.
*/
-static void
-common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting)
+void common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting)
{
const struct k_clock *kc = timr->kclock;
ktime_t now, remaining, iv;
@@ -768,10 +767,9 @@ static int common_hrtimer_try_to_cancel(struct k_itimer *timr)
}

/* Set a POSIX.1b interval timer. */
-static int
-common_timer_set(struct k_itimer *timr, int flags,
- struct itimerspec64 *new_setting,
- struct itimerspec64 *old_setting)
+int common_timer_set(struct k_itimer *timr, int flags,
+ struct itimerspec64 *new_setting,
+ struct itimerspec64 *old_setting)
{
const struct k_clock *kc = timr->kclock;
bool sigev_none;
@@ -855,7 +853,7 @@ retry:
return error;
}

-static int common_timer_del(struct k_itimer *timer)
+int common_timer_del(struct k_itimer *timer)
{
const struct k_clock *kc = timer->kclock;

diff --git a/kernel/time/posix-timers.h b/kernel/time/posix-timers.h
index b0ad77e..b086f5b 100644
--- a/kernel/time/posix-timers.h
+++ b/kernel/time/posix-timers.h
@@ -33,3 +33,9 @@ extern const struct k_clock clock_thread;
extern const struct k_clock alarm_clock;

int posix_timer_event(struct k_itimer *timr, int si_private);
+
+void common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting);
+int common_timer_set(struct k_itimer *timr, int flags,
+ struct itimerspec64 *new_setting,
+ struct itimerspec64 *old_setting);
+int common_timer_del(struct k_itimer *timer);