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-rw-r--r--Documentation/slow-work.txt15
-rw-r--r--include/linux/slow-work.h19
2 files changed, 34 insertions, 0 deletions
diff --git a/Documentation/slow-work.txt b/Documentation/slow-work.txt
index f120238e70f..0169c9d9dd1 100644
--- a/Documentation/slow-work.txt
+++ b/Documentation/slow-work.txt
@@ -144,6 +144,21 @@ from being taken away before it completes. module should almost certainly be
144THIS_MODULE. 144THIS_MODULE.
145 145
146 146
147================
148HELPER FUNCTIONS
149================
150
151The slow-work facility provides a function by which it can be determined
152whether or not an item is queued for later execution:
153
154 bool queued = slow_work_is_queued(struct slow_work *work);
155
156If it returns false, then the item is not on the queue (it may be executing
157with a requeue pending). This can be used to work out whether an item on which
158another depends is on the queue, thus allowing a dependent item to be queued
159after it.
160
161
147=============== 162===============
148ITEM OPERATIONS 163ITEM OPERATIONS
149=============== 164===============
diff --git a/include/linux/slow-work.h b/include/linux/slow-work.h
index f41485145ed..bfd3ab4c889 100644
--- a/include/linux/slow-work.h
+++ b/include/linux/slow-work.h
@@ -120,6 +120,25 @@ static inline void vslow_work_init(struct slow_work *work,
120 INIT_LIST_HEAD(&work->link); 120 INIT_LIST_HEAD(&work->link);
121} 121}
122 122
123/**
124 * slow_work_is_queued - Determine if a slow work item is on the work queue
125 * work: The work item to test
126 *
127 * Determine if the specified slow-work item is on the work queue. This
128 * returns true if it is actually on the queue.
129 *
130 * If the item is executing and has been marked for requeue when execution
131 * finishes, then false will be returned.
132 *
133 * Anyone wishing to wait for completion of execution can wait on the
134 * SLOW_WORK_EXECUTING bit.
135 */
136static inline bool slow_work_is_queued(struct slow_work *work)
137{
138 unsigned long flags = work->flags;
139 return flags & SLOW_WORK_PENDING && !(flags & SLOW_WORK_EXECUTING);
140}
141
123extern int slow_work_enqueue(struct slow_work *work); 142extern int slow_work_enqueue(struct slow_work *work);
124extern void slow_work_cancel(struct slow_work *work); 143extern void slow_work_cancel(struct slow_work *work);
125extern int slow_work_register_user(struct module *owner); 144extern int slow_work_register_user(struct module *owner);