aboutsummaryrefslogtreecommitdiff
path: root/kernel/workqueue.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/workqueue.c')
-rw-r--r--kernel/workqueue.c109
1 files changed, 67 insertions, 42 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 17c2f03d2c2..8d1e7cb8a51 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -80,6 +80,29 @@ static inline int is_single_threaded(struct workqueue_struct *wq)
return list_empty(&wq->list);
}
+static inline void set_wq_data(struct work_struct *work, void *wq)
+{
+ unsigned long new, old, res;
+
+ /* assume the pending flag is already set and that the task has already
+ * been queued on this workqueue */
+ new = (unsigned long) wq | (1UL << WORK_STRUCT_PENDING);
+ res = work->management;
+ if (res != new) {
+ do {
+ old = res;
+ new = (unsigned long) wq;
+ new |= (old & WORK_STRUCT_FLAG_MASK);
+ res = cmpxchg(&work->management, old, new);
+ } while (res != old);
+ }
+}
+
+static inline void *get_wq_data(struct work_struct *work)
+{
+ return (void *) (work->management & WORK_STRUCT_WQ_DATA_MASK);
+}
+
/* Preempt must be disabled. */
static void __queue_work(struct cpu_workqueue_struct *cwq,
struct work_struct *work)
@@ -87,7 +110,7 @@ static void __queue_work(struct cpu_workqueue_struct *cwq,
unsigned long flags;
spin_lock_irqsave(&cwq->lock, flags);
- work->wq_data = cwq;
+ set_wq_data(work, cwq);
list_add_tail(&work->entry, &cwq->worklist);
cwq->insert_sequence++;
wake_up(&cwq->more_work);
@@ -108,7 +131,7 @@ int fastcall queue_work(struct workqueue_struct *wq, struct work_struct *work)
{
int ret = 0, cpu = get_cpu();
- if (!test_and_set_bit(0, &work->pending)) {
+ if (!test_and_set_bit(WORK_STRUCT_PENDING, &work->management)) {
if (unlikely(is_single_threaded(wq)))
cpu = singlethread_cpu;
BUG_ON(!list_empty(&work->entry));
@@ -122,38 +145,42 @@ EXPORT_SYMBOL_GPL(queue_work);
static void delayed_work_timer_fn(unsigned long __data)
{
- struct work_struct *work = (struct work_struct *)__data;
- struct workqueue_struct *wq = work->wq_data;
+ struct delayed_work *dwork = (struct delayed_work *)__data;
+ struct workqueue_struct *wq = get_wq_data(&dwork->work);
int cpu = smp_processor_id();
if (unlikely(is_single_threaded(wq)))
cpu = singlethread_cpu;
- __queue_work(per_cpu_ptr(wq->cpu_wq, cpu), work);
+ __queue_work(per_cpu_ptr(wq->cpu_wq, cpu), &dwork->work);
}
/**
* queue_delayed_work - queue work on a workqueue after delay
* @wq: workqueue to use
- * @work: work to queue
+ * @work: delayable work to queue
* @delay: number of jiffies to wait before queueing
*
* Returns 0 if @work was already on a queue, non-zero otherwise.
*/
int fastcall queue_delayed_work(struct workqueue_struct *wq,
- struct work_struct *work, unsigned long delay)
+ struct delayed_work *dwork, unsigned long delay)
{
int ret = 0;
- struct timer_list *timer = &work->timer;
+ struct timer_list *timer = &dwork->timer;
+ struct work_struct *work = &dwork->work;
+
+ if (delay == 0)
+ return queue_work(wq, work);
- if (!test_and_set_bit(0, &work->pending)) {
+ if (!test_and_set_bit(WORK_STRUCT_PENDING, &work->management)) {
BUG_ON(timer_pending(timer));
BUG_ON(!list_empty(&work->entry));
/* This stores wq for the moment, for the timer_fn */
- work->wq_data = wq;
+ set_wq_data(work, wq);
timer->expires = jiffies + delay;
- timer->data = (unsigned long)work;
+ timer->data = (unsigned long)dwork;
timer->function = delayed_work_timer_fn;
add_timer(timer);
ret = 1;
@@ -172,19 +199,20 @@ EXPORT_SYMBOL_GPL(queue_delayed_work);
* Returns 0 if @work was already on a queue, non-zero otherwise.
*/
int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
- struct work_struct *work, unsigned long delay)
+ struct delayed_work *dwork, unsigned long delay)
{
int ret = 0;
- struct timer_list *timer = &work->timer;
+ struct timer_list *timer = &dwork->timer;
+ struct work_struct *work = &dwork->work;
- if (!test_and_set_bit(0, &work->pending)) {
+ if (!test_and_set_bit(WORK_STRUCT_PENDING, &work->management)) {
BUG_ON(timer_pending(timer));
BUG_ON(!list_empty(&work->entry));
/* This stores wq for the moment, for the timer_fn */
- work->wq_data = wq;
+ set_wq_data(work, wq);
timer->expires = jiffies + delay;
- timer->data = (unsigned long)work;
+ timer->data = (unsigned long)dwork;
timer->function = delayed_work_timer_fn;
add_timer_on(timer, cpu);
ret = 1;
@@ -212,15 +240,15 @@ static void run_workqueue(struct cpu_workqueue_struct *cwq)
while (!list_empty(&cwq->worklist)) {
struct work_struct *work = list_entry(cwq->worklist.next,
struct work_struct, entry);
- void (*f) (void *) = work->func;
- void *data = work->data;
+ work_func_t f = work->func;
list_del_init(cwq->worklist.next);
spin_unlock_irqrestore(&cwq->lock, flags);
- BUG_ON(work->wq_data != cwq);
- clear_bit(0, &work->pending);
- f(data);
+ BUG_ON(get_wq_data(work) != cwq);
+ if (!test_bit(WORK_STRUCT_NOAUTOREL, &work->management))
+ work_release(work);
+ f(work);
spin_lock_irqsave(&cwq->lock, flags);
cwq->remove_sequence++;
@@ -468,38 +496,37 @@ EXPORT_SYMBOL(schedule_work);
/**
* schedule_delayed_work - put work task in global workqueue after delay
- * @work: job to be done
- * @delay: number of jiffies to wait
+ * @dwork: job to be done
+ * @delay: number of jiffies to wait or 0 for immediate execution
*
* After waiting for a given time this puts a job in the kernel-global
* workqueue.
*/
-int fastcall schedule_delayed_work(struct work_struct *work, unsigned long delay)
+int fastcall schedule_delayed_work(struct delayed_work *dwork, unsigned long delay)
{
- return queue_delayed_work(keventd_wq, work, delay);
+ return queue_delayed_work(keventd_wq, dwork, delay);
}
EXPORT_SYMBOL(schedule_delayed_work);
/**
* schedule_delayed_work_on - queue work in global workqueue on CPU after delay
* @cpu: cpu to use
- * @work: job to be done
+ * @dwork: job to be done
* @delay: number of jiffies to wait
*
* After waiting for a given time this puts a job in the kernel-global
* workqueue on the specified CPU.
*/
int schedule_delayed_work_on(int cpu,
- struct work_struct *work, unsigned long delay)
+ struct delayed_work *dwork, unsigned long delay)
{
- return queue_delayed_work_on(cpu, keventd_wq, work, delay);
+ return queue_delayed_work_on(cpu, keventd_wq, dwork, delay);
}
EXPORT_SYMBOL(schedule_delayed_work_on);
/**
* schedule_on_each_cpu - call a function on each online CPU from keventd
* @func: the function to call
- * @info: a pointer to pass to func()
*
* Returns zero on success.
* Returns -ve errno on failure.
@@ -508,7 +535,7 @@ EXPORT_SYMBOL(schedule_delayed_work_on);
*
* schedule_on_each_cpu() is very slow.
*/
-int schedule_on_each_cpu(void (*func)(void *info), void *info)
+int schedule_on_each_cpu(work_func_t func)
{
int cpu;
struct work_struct *works;
@@ -519,7 +546,7 @@ int schedule_on_each_cpu(void (*func)(void *info), void *info)
mutex_lock(&workqueue_mutex);
for_each_online_cpu(cpu) {
- INIT_WORK(per_cpu_ptr(works, cpu), func, info);
+ INIT_WORK(per_cpu_ptr(works, cpu), func);
__queue_work(per_cpu_ptr(keventd_wq->cpu_wq, cpu),
per_cpu_ptr(works, cpu));
}
@@ -539,12 +566,12 @@ EXPORT_SYMBOL(flush_scheduled_work);
* cancel_rearming_delayed_workqueue - reliably kill off a delayed
* work whose handler rearms the delayed work.
* @wq: the controlling workqueue structure
- * @work: the delayed work struct
+ * @dwork: the delayed work struct
*/
void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq,
- struct work_struct *work)
+ struct delayed_work *dwork)
{
- while (!cancel_delayed_work(work))
+ while (!cancel_delayed_work(dwork))
flush_workqueue(wq);
}
EXPORT_SYMBOL(cancel_rearming_delayed_workqueue);
@@ -552,18 +579,17 @@ EXPORT_SYMBOL(cancel_rearming_delayed_workqueue);
/**
* cancel_rearming_delayed_work - reliably kill off a delayed keventd
* work whose handler rearms the delayed work.
- * @work: the delayed work struct
+ * @dwork: the delayed work struct
*/
-void cancel_rearming_delayed_work(struct work_struct *work)
+void cancel_rearming_delayed_work(struct delayed_work *dwork)
{
- cancel_rearming_delayed_workqueue(keventd_wq, work);
+ cancel_rearming_delayed_workqueue(keventd_wq, dwork);
}
EXPORT_SYMBOL(cancel_rearming_delayed_work);
/**
* execute_in_process_context - reliably execute the routine with user context
* @fn: the function to execute
- * @data: data to pass to the function
* @ew: guaranteed storage for the execute work structure (must
* be available when the work executes)
*
@@ -573,15 +599,14 @@ EXPORT_SYMBOL(cancel_rearming_delayed_work);
* Returns: 0 - function was executed
* 1 - function was scheduled for execution
*/
-int execute_in_process_context(void (*fn)(void *data), void *data,
- struct execute_work *ew)
+int execute_in_process_context(work_func_t fn, struct execute_work *ew)
{
if (!in_interrupt()) {
- fn(data);
+ fn(&ew->work);
return 0;
}
- INIT_WORK(&ew->work, fn, data);
+ INIT_WORK(&ew->work, fn);
schedule_work(&ew->work);
return 1;