timers: Improve alarmtimer comments and minor fixes
This patch addresses a number of minor comment improvements and other minor issues from Thomas' review of the alarmtimers code. CC: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
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180bf812ce
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@ -13,12 +13,22 @@ enum alarmtimer_type {
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ALARM_NUMTYPE,
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};
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/**
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* struct alarm - Alarm timer structure
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* @node: timerqueue node for adding to the event list this value
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* also includes the expiration time.
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* @period: Period for recuring alarms
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* @function: Function pointer to be executed when the timer fires.
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* @type: Alarm type (BOOTTIME/REALTIME)
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* @enabled: Flag that represents if the alarm is set to fire or not
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* @data: Internal data value.
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*/
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struct alarm {
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struct timerqueue_node node;
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ktime_t period;
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void (*function)(struct alarm *);
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enum alarmtimer_type type;
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char enabled;
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bool enabled;
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void *data;
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};
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@ -26,7 +26,15 @@
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#include <linux/workqueue.h>
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#include <linux/freezer.h>
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/**
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* struct alarm_base - Alarm timer bases
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* @lock: Lock for syncrhonized access to the base
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* @timerqueue: Timerqueue head managing the list of events
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* @timer: hrtimer used to schedule events while running
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* @gettime: Function to read the time correlating to the base
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* @base_clockid: clockid for the base
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* @irqwork Delayed work structure for expiring timers
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*/
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static struct alarm_base {
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spinlock_t lock;
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struct timerqueue_head timerqueue;
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@ -36,18 +44,16 @@ static struct alarm_base {
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struct work_struct irqwork;
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} alarm_bases[ALARM_NUMTYPE];
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/* rtc timer and device for setting alarm wakeups at suspend */
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static struct rtc_timer rtctimer;
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static struct rtc_device *rtcdev;
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/* freezer delta & lock used to handle clock_nanosleep triggered wakeups */
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static ktime_t freezer_delta;
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static DEFINE_SPINLOCK(freezer_delta_lock);
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/**************************************************************************
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* alarmtimer management code
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*/
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/*
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/**
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* alarmtimer_enqueue - Adds an alarm timer to an alarm_base timerqueue
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* @base: pointer to the base where the timer is being run
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* @alarm: pointer to alarm being enqueued.
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@ -67,7 +73,7 @@ static void alarmtimer_enqueue(struct alarm_base *base, struct alarm *alarm)
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}
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}
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/*
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/**
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* alarmtimer_remove - Removes an alarm timer from an alarm_base timerqueue
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* @base: pointer to the base where the timer is running
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* @alarm: pointer to alarm being removed
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@ -91,16 +97,16 @@ static void alarmtimer_remove(struct alarm_base *base, struct alarm *alarm)
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}
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}
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/*
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/**
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* alarmtimer_do_work - Handles alarm being fired.
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* @work: pointer to workqueue being run
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*
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* When a timer fires, this runs through the timerqueue to see
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* which alarm timers, and run those that expired. If there are
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* more alarm timers queued, we set the hrtimer to fire in the
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* future.
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* When a alarm timer fires, this runs through the timerqueue to
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* see which alarms expired, and runs those. If there are more alarm
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* timers queued for the future, we set the hrtimer to fire when
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* when the next future alarm timer expires.
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*/
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void alarmtimer_do_work(struct work_struct *work)
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static void alarmtimer_do_work(struct work_struct *work)
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{
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struct alarm_base *base = container_of(work, struct alarm_base,
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irqwork);
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@ -141,7 +147,7 @@ void alarmtimer_do_work(struct work_struct *work)
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}
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/*
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/**
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* alarmtimer_fired - Handles alarm hrtimer being fired.
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* @timer: pointer to hrtimer being run
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*
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@ -156,7 +162,7 @@ static enum hrtimer_restart alarmtimer_fired(struct hrtimer *timer)
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}
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/*
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/**
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* alarmtimer_suspend - Suspend time callback
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* @dev: unused
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* @state: unused
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@ -230,17 +236,11 @@ static void alarmtimer_freezerset(ktime_t absexp, enum alarmtimer_type type)
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}
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/**************************************************************************
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* alarm kernel interface code
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*/
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/*
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/**
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* alarm_init - Initialize an alarm structure
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* @alarm: ptr to alarm to be initialized
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* @type: the type of the alarm
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* @function: callback that is run when the alarm fires
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*
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* In-kernel interface to initializes the alarm structure.
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*/
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void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
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void (*function)(struct alarm *))
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@ -252,13 +252,11 @@ void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
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alarm->enabled = 0;
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}
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/*
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/**
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* alarm_start - Sets an alarm to fire
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* @alarm: ptr to alarm to set
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* @start: time to run the alarm
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* @period: period at which the alarm will recur
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*
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* In-kernel interface set an alarm timer.
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*/
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void alarm_start(struct alarm *alarm, ktime_t start, ktime_t period)
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{
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@ -275,11 +273,9 @@ void alarm_start(struct alarm *alarm, ktime_t start, ktime_t period)
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spin_unlock_irqrestore(&base->lock, flags);
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}
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/*
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/**
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* alarm_cancel - Tries to cancel an alarm timer
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* @alarm: ptr to alarm to be canceled
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*
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* In-kernel interface to cancel an alarm timer.
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*/
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void alarm_cancel(struct alarm *alarm)
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{
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@ -294,15 +290,9 @@ void alarm_cancel(struct alarm *alarm)
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}
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/**************************************************************************
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* alarm posix interface code
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*/
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/*
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/**
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* clock2alarm - helper that converts from clockid to alarmtypes
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* @clockid: clockid.
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*
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* Helper function that converts from clockids to alarmtypes
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*/
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static enum alarmtimer_type clock2alarm(clockid_t clockid)
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{
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@ -313,7 +303,7 @@ static enum alarmtimer_type clock2alarm(clockid_t clockid)
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return -1;
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}
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/*
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/**
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* alarm_handle_timer - Callback for posix timers
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* @alarm: alarm that fired
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*
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@ -327,7 +317,7 @@ static void alarm_handle_timer(struct alarm *alarm)
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ptr->it_overrun++;
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}
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/*
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/**
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* alarm_clock_getres - posix getres interface
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* @which_clock: clockid
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* @tp: timespec to fill
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@ -598,9 +588,6 @@ out:
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return ret;
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}
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/**************************************************************************
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* alarmtimer initialization code
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*/
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/* Suspend hook structures */
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static const struct dev_pm_ops alarmtimer_pm_ops = {
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