@@ -1202,20 +1202,14 @@ void add_timer_on(struct timer_list *timer, int cpu)
EXPORT_SYMBOL_GPL(add_timer_on);
/**
- * timer_delete - Deactivate a timer
+ * __timer_delete - Internal function: Deactivate a timer
* @timer: The timer to be deactivated
*
- * The function only deactivates a pending timer, but contrary to
- * timer_delete_sync() it does not take into account whether the timer's
- * callback function is concurrently executed on a different CPU or not.
- * It neither prevents rearming of the timer. If @timer can be rearmed
- * concurrently then the return value of this function is meaningless.
- *
* Return:
* * %0 - The timer was not pending
* * %1 - The timer was pending and deactivated
*/
-int timer_delete(struct timer_list *timer)
+static int __timer_delete(struct timer_list *timer)
{
struct timer_base *base;
unsigned long flags;
@@ -1231,25 +1225,37 @@ int timer_delete(struct timer_list *timer)
return ret;
}
-EXPORT_SYMBOL(timer_delete);
/**
- * try_to_del_timer_sync - Try to deactivate a timer
- * @timer: Timer to deactivate
+ * timer_delete - Deactivate a timer
+ * @timer: The timer to be deactivated
*
- * This function tries to deactivate a timer. On success the timer is not
- * queued and the timer callback function is not running on any CPU.
+ * The function only deactivates a pending timer, but contrary to
+ * timer_delete_sync() it does not take into account whether the timer's
+ * callback function is concurrently executed on a different CPU or not.
+ * It neither prevents rearming of the timer. If @timer can be rearmed
+ * concurrently then the return value of this function is meaningless.
*
- * This function does not guarantee that the timer cannot be rearmed right
- * after dropping the base lock. That needs to be prevented by the calling
- * code if necessary.
+ * Return:
+ * * %0 - The timer was not pending
+ * * %1 - The timer was pending and deactivated
+ */
+int timer_delete(struct timer_list *timer)
+{
+ return __timer_delete(timer);
+}
+EXPORT_SYMBOL(timer_delete);
+
+/**
+ * __try_to_del_timer_sync - Internal function: Try to deactivate a timer
+ * @timer: Timer to deactivate
*
* Return:
* * %0 - The timer was not pending
* * %1 - The timer was pending and deactivated
* * %-1 - The timer callback function is running on a different CPU
*/
-int try_to_del_timer_sync(struct timer_list *timer)
+static int __try_to_del_timer_sync(struct timer_list *timer)
{
struct timer_base *base;
unsigned long flags;
@@ -1266,6 +1272,27 @@ int try_to_del_timer_sync(struct timer_list *timer)
return ret;
}
+
+/**
+ * try_to_del_timer_sync - Try to deactivate a timer
+ * @timer: Timer to deactivate
+ *
+ * This function tries to deactivate a timer. On success the timer is not
+ * queued and the timer callback function is not running on any CPU.
+ *
+ * This function does not guarantee that the timer cannot be rearmed right
+ * after dropping the base lock. That needs to be prevented by the calling
+ * code if necessary.
+ *
+ * Return:
+ * * %0 - The timer was not pending
+ * * %1 - The timer was pending and deactivated
+ * * %-1 - The timer callback function is running on a different CPU
+ */
+int try_to_del_timer_sync(struct timer_list *timer)
+{
+ return __try_to_del_timer_sync(timer);
+}
EXPORT_SYMBOL(try_to_del_timer_sync);
#ifdef CONFIG_PREEMPT_RT
@@ -1342,45 +1369,15 @@ static inline void del_timer_wait_running(struct timer_list *timer) { }
#endif
/**
- * timer_delete_sync - Deactivate a timer and wait for the handler to finish.
+ * __timer_delete_sync - Internal function: Deactivate a timer and wait
+ * for the handler to finish.
* @timer: The timer to be deactivated
*
- * Synchronization rules: Callers must prevent restarting of the timer,
- * otherwise this function is meaningless. It must not be called from
- * interrupt contexts unless the timer is an irqsafe one. The caller must
- * not hold locks which would prevent completion of the timer's callback
- * function. The timer's handler must not call add_timer_on(). Upon exit
- * the timer is not queued and the handler is not running on any CPU.
- *
- * For !irqsafe timers, the caller must not hold locks that are held in
- * interrupt context. Even if the lock has nothing to do with the timer in
- * question. Here's why::
- *
- * CPU0 CPU1
- * ---- ----
- * <SOFTIRQ>
- * call_timer_fn();
- * base->running_timer = mytimer;
- * spin_lock_irq(somelock);
- * <IRQ>
- * spin_lock(somelock);
- * timer_delete_sync(mytimer);
- * while (base->running_timer == mytimer);
- *
- * Now timer_delete_sync() will never return and never release somelock.
- * The interrupt on the other CPU is waiting to grab somelock but it has
- * interrupted the softirq that CPU0 is waiting to finish.
- *
- * This function cannot guarantee that the timer is not rearmed again by
- * some concurrent or preempting code, right after it dropped the base
- * lock. If there is the possibility of a concurrent rearm then the return
- * value of the function is meaningless.
- *
* Return:
* * %0 - The timer was not pending
* * %1 - The timer was pending and deactivated
*/
-int timer_delete_sync(struct timer_list *timer)
+static int __timer_delete_sync(struct timer_list *timer)
{
int ret;
@@ -1400,7 +1397,7 @@ int timer_delete_sync(struct timer_list *timer)
* don't use it in hardirq context, because it
* could lead to deadlock.
*/
- WARN_ON(in_irq() && !(timer->flags & TIMER_IRQSAFE));
+ WARN_ON(in_hardirq() && !(timer->flags & TIMER_IRQSAFE));
/*
* Must be able to sleep on PREEMPT_RT because of the slowpath in
@@ -1410,7 +1407,7 @@ int timer_delete_sync(struct timer_list *timer)
lockdep_assert_preemption_enabled();
do {
- ret = try_to_del_timer_sync(timer);
+ ret = __try_to_del_timer_sync(timer);
if (unlikely(ret < 0)) {
del_timer_wait_running(timer);
@@ -1420,6 +1417,50 @@ int timer_delete_sync(struct timer_list *timer)
return ret;
}
+
+/**
+ * timer_delete_sync - Deactivate a timer and wait for the handler to finish.
+ * @timer: The timer to be deactivated
+ *
+ * Synchronization rules: Callers must prevent restarting of the timer,
+ * otherwise this function is meaningless. It must not be called from
+ * interrupt contexts unless the timer is an irqsafe one. The caller must
+ * not hold locks which would prevent completion of the timer's callback
+ * function. The timer's handler must not call add_timer_on(). Upon exit
+ * the timer is not queued and the handler is not running on any CPU.
+ *
+ * For !irqsafe timers, the caller must not hold locks that are held in
+ * interrupt context. Even if the lock has nothing to do with the timer in
+ * question. Here's why::
+ *
+ * CPU0 CPU1
+ * ---- ----
+ * <SOFTIRQ>
+ * call_timer_fn();
+ * base->running_timer = mytimer;
+ * spin_lock_irq(somelock);
+ * <IRQ>
+ * spin_lock(somelock);
+ * timer_delete_sync(mytimer);
+ * while (base->running_timer == mytimer);
+ *
+ * Now timer_delete_sync() will never return and never release somelock.
+ * The interrupt on the other CPU is waiting to grab somelock but it has
+ * interrupted the softirq that CPU0 is waiting to finish.
+ *
+ * This function cannot guarantee that the timer is not rearmed again by
+ * some concurrent or preempting code, right after it dropped the base
+ * lock. If there is the possibility of a concurrent rearm then the return
+ * value of the function is meaningless.
+ *
+ * Return:
+ * * %0 - The timer was not pending
+ * * %1 - The timer was pending and deactivated
+ */
+int timer_delete_sync(struct timer_list *timer)
+{
+ return __timer_delete_sync(timer);
+}
EXPORT_SYMBOL(timer_delete_sync);
static void call_timer_fn(struct timer_list *timer,