kthread_worker: reorganize to prepare for flush_kthread_work() reimplementation

Make the following two non-functional changes.

* Separate out insert_kthread_work() from queue_kthread_work().

* Relocate struct kthread_flush_work and kthread_flush_work_fn()
  definitions above flush_kthread_work().

v2: Added lockdep_assert_held() in insert_kthread_work() as suggested
    by Andy Walls.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Andy Walls <awalls@md.metrocast.net>

diff --git a/kernel/kthread.c b/kernel/kthread.c
index 3d3de633702eab369586096a47a2f10dde5720aa..4bfbff36d4472d83444047bbfd030c433814ef4d 100644 (file)
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -378,6 +378,19 @@ repeat:
 }
 EXPORT_SYMBOL_GPL(kthread_worker_fn);
 
+/* insert @work before @pos in @worker */
+static void insert_kthread_work(struct kthread_worker *worker,
+                              struct kthread_work *work,
+                              struct list_head *pos)
+{
+       lockdep_assert_held(&worker->lock);
+
+       list_add_tail(&work->node, pos);
+       work->queue_seq++;
+       if (likely(worker->task))
+               wake_up_process(worker->task);
+}
+
 /**
  * queue_kthread_work - queue a kthread_work
  * @worker: target kthread_worker
@@ -395,10 +408,7 @@ bool queue_kthread_work(struct kthread_worker *worker,
 
        spin_lock_irqsave(&worker->lock, flags);
        if (list_empty(&work->node)) {
-               list_add_tail(&work->node, &worker->work_list);
-               work->queue_seq++;
-               if (likely(worker->task))
-                       wake_up_process(worker->task);
+               insert_kthread_work(worker, work, &worker->work_list);
                ret = true;
        }
        spin_unlock_irqrestore(&worker->lock, flags);
@@ -406,6 +416,18 @@ bool queue_kthread_work(struct kthread_worker *worker,
 }
 EXPORT_SYMBOL_GPL(queue_kthread_work);
 
+struct kthread_flush_work {
+       struct kthread_work     work;
+       struct completion       done;
+};
+
+static void kthread_flush_work_fn(struct kthread_work *work)
+{
+       struct kthread_flush_work *fwork =
+               container_of(work, struct kthread_flush_work, work);
+       complete(&fwork->done);
+}
+
 /**
  * flush_kthread_work - flush a kthread_work
  * @work: work to flush
@@ -436,18 +458,6 @@ void flush_kthread_work(struct kthread_work *work)
 }
 EXPORT_SYMBOL_GPL(flush_kthread_work);
 
-struct kthread_flush_work {
-       struct kthread_work     work;
-       struct completion       done;
-};
-
-static void kthread_flush_work_fn(struct kthread_work *work)
-{
-       struct kthread_flush_work *fwork =
-               container_of(work, struct kthread_flush_work, work);
-       complete(&fwork->done);
-}
-
 /**
  * flush_kthread_worker - flush all current works on a kthread_worker
  * @worker: worker to flush