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| author | John Stultz <john.stultz@linaro.org> | 2011-08-10 10:37:59 -0700 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2011-08-10 14:55:20 -0700 |
| commit | 4b41308d2d0398409620613c7eaaaf52c738b042 (patch) | |
| tree | 47a6becae6272eb9c06e57a0a9d1698b8f1811c8 /kernel/time | |
| parent | 6af7e471e5a7746b8024d70b4363d3dfe41d36b8 (diff) | |
| download | linux-stable-4b41308d2d0398409620613c7eaaaf52c738b042.tar.gz linux-stable-4b41308d2d0398409620613c7eaaaf52c738b042.tar.bz2 linux-stable-4b41308d2d0398409620613c7eaaaf52c738b042.zip | |
alarmtimers: Change alarmtimer functions to return alarmtimer_restart values
In order to properly fix the denial of service issue with high freq
periodic alarm timers, we need to push the re-arming logic into the
alarm timer handler, much as the hrtimer code does.
This patch introduces alarmtimer_restart enum and changes the
alarmtimer handler declarations to use it as a return value. Further,
to ease following changes, it extends the alarmtimer handler functions
to also take the time at expiration. No logic is yet modified.
CC: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/alarmtimer.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c index ea5e1a928d5b..9e786053ffa2 100644 --- a/kernel/time/alarmtimer.c +++ b/kernel/time/alarmtimer.c @@ -196,7 +196,7 @@ static enum hrtimer_restart alarmtimer_fired(struct hrtimer *timer) } spin_unlock_irqrestore(&base->lock, flags); if (alarm->function) - alarm->function(alarm); + alarm->function(alarm, now); spin_lock_irqsave(&base->lock, flags); } @@ -299,7 +299,7 @@ static void alarmtimer_freezerset(ktime_t absexp, enum alarmtimer_type type) * @function: callback that is run when the alarm fires */ void alarm_init(struct alarm *alarm, enum alarmtimer_type type, - void (*function)(struct alarm *)) + enum alarmtimer_restart (*function)(struct alarm *, ktime_t)) { timerqueue_init(&alarm->node); alarm->period = ktime_set(0, 0); @@ -365,12 +365,15 @@ static enum alarmtimer_type clock2alarm(clockid_t clockid) * * Posix timer callback for expired alarm timers. */ -static void alarm_handle_timer(struct alarm *alarm) +static enum alarmtimer_restart alarm_handle_timer(struct alarm *alarm, + ktime_t now) { struct k_itimer *ptr = container_of(alarm, struct k_itimer, it.alarmtimer); if (posix_timer_event(ptr, 0) != 0) ptr->it_overrun++; + + return ALARMTIMER_NORESTART; } /** @@ -509,13 +512,15 @@ static int alarm_timer_set(struct k_itimer *timr, int flags, * * Wakes up the task that set the alarmtimer */ -static void alarmtimer_nsleep_wakeup(struct alarm *alarm) +static enum alarmtimer_restart alarmtimer_nsleep_wakeup(struct alarm *alarm, + ktime_t now) { struct task_struct *task = (struct task_struct *)alarm->data; alarm->data = NULL; if (task) wake_up_process(task); + return ALARMTIMER_NORESTART; } /** |