1 files changed, 53 insertions, 24 deletions

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 25e02c941bac..f584aba78ca9 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -127,12 +127,20 @@ struct execute_work {
         .timer = TIMER_INITIALIZER(NULL, 0, 0),                 \
         }
 
+#define __DEFERRED_WORK_INITIALIZER(n, f) {                     \
+        .work = __WORK_INITIALIZER((n).work, (f)),              \
+        .timer = TIMER_DEFERRED_INITIALIZER(NULL, 0, 0),        \
+        }
+
 #define DECLARE_WORK(n, f)                                      \
         struct work_struct n = __WORK_INITIALIZER(n, f)
 
 #define DECLARE_DELAYED_WORK(n, f)                              \
         struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f)
 
+#define DECLARE_DEFERRED_WORK(n, f)                             \
+        struct delayed_work n = __DEFERRED_WORK_INITIALIZER(n, f)
+
 /*
  * initialize a work item's function pointer
  */
@@ -190,7 +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)
@@ -201,9 +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)
 
@@ -242,12 +250,13 @@ static inline unsigned int work_static(struct work_struct *work) { return 0; }
 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_FREEZABLE            = 1 << 2, /* freeze during suspend */
+        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 */
@@ -277,11 +286,15 @@ enum {
  * any specific CPU, not concurrency managed, and all queued works are
  * executed immediately as long as max_active limit is not reached and
  * resources are available.
+ *
+ * system_freezable_wq is equivalent to system_wq except that it's
+ * freezable.
  */
 extern struct workqueue_struct *system_wq;
 extern struct workqueue_struct *system_long_wq;
 extern struct workqueue_struct *system_nrt_wq;
 extern struct workqueue_struct *system_unbound_wq;
+extern struct workqueue_struct *system_freezable_wq;
 
 extern struct workqueue_struct *
 __alloc_workqueue_key(const char *name, unsigned int flags, int max_active,
@@ -306,12 +319,30 @@ __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_FREEZABLE 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)
-#define create_freezeable_workqueue(name)                       \
-        alloc_workqueue((name), WQ_FREEZEABLE | WQ_UNBOUND | WQ_RESCUER, 1)
+        alloc_workqueue((name), WQ_MEM_RECLAIM, 1)
+#define create_freezable_workqueue(name)                        \
+        alloc_workqueue((name), WQ_FREEZABLE | 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);
 
@@ -325,7 +356,6 @@ 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);
@@ -337,8 +367,13 @@ 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);
@@ -352,9 +387,9 @@ 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)
@@ -367,9 +402,9 @@ 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)
@@ -377,10 +412,8 @@ 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
+static inline __deprecated
 void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq,
                                         struct delayed_work *work)
 {
@@ -388,7 +421,7 @@ void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq,
 }
 
 /* Obsolete. use cancel_delayed_work_sync() */
-static inline
+static inline __deprecated
 void cancel_rearming_delayed_work(struct delayed_work *work)
 {
         cancel_delayed_work_sync(work);
@@ -409,8 +442,4 @@ 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