Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[karo-tx-linux.git] / include / linux / workqueue.h

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 88238c15ec3ee21a96e408e11eec251f7996043d..bd257fee60310184b52d0f8c15f1206f6a4f5dad 100644 (file)
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -198,7 +198,7 @@ static inline unsigned int work_static(struct work_struct *work) { return 0; }
                __INIT_WORK((_work), (_func), 0);               \
        } while (0)
 
-#define INIT_WORK_ON_STACK(_work, _func)                       \
+#define INIT_WORK_ONSTACK(_work, _func)                                \
        do {                                                    \
                __INIT_WORK((_work), (_func), 1);               \
        } while (0)
@@ -209,9 +209,9 @@ static inline unsigned int work_static(struct work_struct *work) { return 0; }
                init_timer(&(_work)->timer);                    \
        } while (0)
 
-#define INIT_DELAYED_WORK_ON_STACK(_work, _func)               \
+#define INIT_DELAYED_WORK_ONSTACK(_work, _func)                        \
        do {                                                    \
-               INIT_WORK_ON_STACK(&(_work)->work, (_func));    \
+               INIT_WORK_ONSTACK(&(_work)->work, (_func));     \
                init_timer_on_stack(&(_work)->timer);           \
        } while (0)
 
@@ -243,15 +243,20 @@ static inline unsigned int work_static(struct work_struct *work) { return 0; }
 #define work_clear_pending(work) \
        clear_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
 
+/*
+ * Workqueue flags and constants.  For details, please refer to
+ * Documentation/workqueue.txt.
+ */
 enum {
        WQ_NON_REENTRANT        = 1 << 0, /* guarantee non-reentrance */
        WQ_UNBOUND              = 1 << 1, /* not bound to any cpu */
        WQ_FREEZEABLE           = 1 << 2, /* freeze during suspend */
-       WQ_RESCUER              = 1 << 3, /* has an rescue worker */
+       WQ_MEM_RECLAIM          = 1 << 3, /* may be used for memory reclaim */
        WQ_HIGHPRI              = 1 << 4, /* high priority */
        WQ_CPU_INTENSIVE        = 1 << 5, /* cpu instensive workqueue */
 
        WQ_DYING                = 1 << 6, /* internal: workqueue is dying */
+       WQ_RESCUER              = 1 << 7, /* internal: workqueue has rescuer */
 
        WQ_MAX_ACTIVE           = 512,    /* I like 512, better ideas? */
        WQ_MAX_UNBOUND_PER_CPU  = 4,      /* 4 * #cpus for unbound wq */
@@ -310,12 +315,30 @@ __alloc_workqueue_key(const char *name, unsigned int flags, int max_active,
        __alloc_workqueue_key((name), (flags), (max_active), NULL, NULL)
 #endif
 
+/**
+ * alloc_ordered_workqueue - allocate an ordered workqueue
+ * @name: name of the workqueue
+ * @flags: WQ_* flags (only WQ_FREEZEABLE and WQ_MEM_RECLAIM are meaningful)
+ *
+ * Allocate an ordered workqueue.  An ordered workqueue executes at
+ * most one work item at any given time in the queued order.  They are
+ * implemented as unbound workqueues with @max_active of one.
+ *
+ * RETURNS:
+ * Pointer to the allocated workqueue on success, %NULL on failure.
+ */
+static inline struct workqueue_struct *
+alloc_ordered_workqueue(const char *name, unsigned int flags)
+{
+       return alloc_workqueue(name, WQ_UNBOUND | flags, 1);
+}
+
 #define create_workqueue(name)                                 \
-       alloc_workqueue((name), WQ_RESCUER, 1)
+       alloc_workqueue((name), WQ_MEM_RECLAIM, 1)
 #define create_freezeable_workqueue(name)                      \
-       alloc_workqueue((name), WQ_FREEZEABLE | WQ_UNBOUND | WQ_RESCUER, 1)
+       alloc_workqueue((name), WQ_FREEZEABLE | WQ_UNBOUND | WQ_MEM_RECLAIM, 1)
 #define create_singlethread_workqueue(name)                    \
-       alloc_workqueue((name), WQ_UNBOUND | WQ_RESCUER, 1)
+       alloc_workqueue((name), WQ_UNBOUND | WQ_MEM_RECLAIM, 1)
 
 extern void destroy_workqueue(struct workqueue_struct *wq);
 
@@ -329,7 +352,6 @@ extern int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
 
 extern void flush_workqueue(struct workqueue_struct *wq);
 extern void flush_scheduled_work(void);
-extern void flush_delayed_work(struct delayed_work *work);
 
 extern int schedule_work(struct work_struct *work);
 extern int schedule_work_on(int cpu, struct work_struct *work);
@@ -341,8 +363,13 @@ extern int keventd_up(void);
 
 int execute_in_process_context(work_func_t fn, struct execute_work *);
 
-extern int flush_work(struct work_struct *work);
-extern int cancel_work_sync(struct work_struct *work);
+extern bool flush_work(struct work_struct *work);
+extern bool flush_work_sync(struct work_struct *work);
+extern bool cancel_work_sync(struct work_struct *work);
+
+extern bool flush_delayed_work(struct delayed_work *dwork);
+extern bool flush_delayed_work_sync(struct delayed_work *work);
+extern bool cancel_delayed_work_sync(struct delayed_work *dwork);
 
 extern void workqueue_set_max_active(struct workqueue_struct *wq,
                                     int max_active);
@@ -356,9 +383,9 @@ extern unsigned int work_busy(struct work_struct *work);
  * it returns 1 and the work doesn't re-arm itself. Run flush_workqueue() or
  * cancel_work_sync() to wait on it.
  */
-static inline int cancel_delayed_work(struct delayed_work *work)
+static inline bool cancel_delayed_work(struct delayed_work *work)
 {
-       int ret;
+       bool ret;
 
        ret = del_timer_sync(&work->timer);
        if (ret)
@@ -371,9 +398,9 @@ static inline int cancel_delayed_work(struct delayed_work *work)
  * if it returns 0 the timer function may be running and the queueing is in
  * progress.
  */
-static inline int __cancel_delayed_work(struct delayed_work *work)
+static inline bool __cancel_delayed_work(struct delayed_work *work)
 {
-       int ret;
+       bool ret;
 
        ret = del_timer(&work->timer);
        if (ret)
@@ -381,8 +408,6 @@ static inline int __cancel_delayed_work(struct delayed_work *work)
        return ret;
 }
 
-extern int cancel_delayed_work_sync(struct delayed_work *work);
-
 /* Obsolete. use cancel_delayed_work_sync() */
 static inline
 void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq,
@@ -413,8 +438,4 @@ extern bool freeze_workqueues_busy(void);
 extern void thaw_workqueues(void);
 #endif /* CONFIG_FREEZER */
 
-#ifdef CONFIG_LOCKDEP
-int in_workqueue_context(struct workqueue_struct *wq);
-#endif
-
 #endif