kthread_worker: reimplement flush_kthread_work() to allow freeing the work item being...

kthread_worker provides minimalistic workqueue-like interface for
users which need a dedicated worker thread (e.g. for realtime
priority).  It has basic queue, flush_work, flush_worker operations
which mostly match the workqueue counterparts; however, due to the way
flush_work() is implemented, it has a noticeable difference of not
allowing work items to be freed while being executed.

While the current users of kthread_worker are okay with the current
behavior, the restriction does impede some valid use cases.  Also,
removing this difference isn't difficult and actually makes the code
easier to understand.

This patch reimplements flush_kthread_work() such that it uses a
flush_work item instead of queue/done sequence numbers.

Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index 0714b24c0e454c38750e4509a6bc5ee17e394673..22ccf9dee177dcfe7ec6b91eeb6b5c6867fc4903 100644 (file)
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h
@@ -49,8 +49,6 @@ extern int tsk_fork_get_node(struct task_struct *tsk);
  * can be queued and flushed using queue/flush_kthread_work()
  * respectively.  Queued kthread_works are processed by a kthread
  * running kthread_worker_fn().
- *
- * A kthread_work can't be freed while it is executing.
  */
 struct kthread_work;
 typedef void (*kthread_work_func_t)(struct kthread_work *work);
@@ -59,15 +57,14 @@ struct kthread_worker {
        spinlock_t              lock;
        struct list_head        work_list;
        struct task_struct      *task;
+       struct kthread_work     *current_work;
 };
 
 struct kthread_work {
        struct list_head        node;
        kthread_work_func_t     func;
        wait_queue_head_t       done;
-       atomic_t                flushing;
-       int                     queue_seq;
-       int                     done_seq;
+       struct kthread_worker   *worker;
 };
 
 #define KTHREAD_WORKER_INIT(worker)    {                               \
@@ -79,7 +76,6 @@ struct kthread_work {
        .node = LIST_HEAD_INIT((work).node),                            \
        .func = (fn),                                                   \
        .done = __WAIT_QUEUE_HEAD_INITIALIZER((work).done),             \
-       .flushing = ATOMIC_INIT(0),                                     \
        }
 
 #define DEFINE_KTHREAD_WORKER(worker)                                  \

diff --git a/kernel/kthread.c b/kernel/kthread.c
index 4bfbff36d4472d83444047bbfd030c433814ef4d..b579af57ea107af579e6a155730258166dd4e176 100644 (file)
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -360,16 +360,12 @@ repeat:
                                        struct kthread_work, node);
                list_del_init(&work->node);
        }
+       worker->current_work = work;
        spin_unlock_irq(&worker->lock);
 
        if (work) {
                __set_current_state(TASK_RUNNING);
                work->func(work);
-               smp_wmb();      /* wmb worker-b0 paired with flush-b1 */
-               work->done_seq = work->queue_seq;
-               smp_mb();       /* mb worker-b1 paired with flush-b0 */
-               if (atomic_read(&work->flushing))
-                       wake_up_all(&work->done);
        } else if (!freezing(current))
                schedule();
 
@@ -386,7 +382,7 @@ static void insert_kthread_work(struct kthread_worker *worker,
        lockdep_assert_held(&worker->lock);
 
        list_add_tail(&work->node, pos);
-       work->queue_seq++;
+       work->worker = worker;
        if (likely(worker->task))
                wake_up_process(worker->task);
 }
@@ -436,25 +432,35 @@ static void kthread_flush_work_fn(struct kthread_work *work)
  */
 void flush_kthread_work(struct kthread_work *work)
 {
-       int seq = work->queue_seq;
+       struct kthread_flush_work fwork = {
+               KTHREAD_WORK_INIT(fwork.work, kthread_flush_work_fn),
+               COMPLETION_INITIALIZER_ONSTACK(fwork.done),
+       };
+       struct kthread_worker *worker;
+       bool noop = false;
+
+retry:
+       worker = work->worker;
+       if (!worker)
+               return;
 
-       atomic_inc(&work->flushing);
+       spin_lock_irq(&worker->lock);
+       if (work->worker != worker) {
+               spin_unlock_irq(&worker->lock);
+               goto retry;
+       }
 
-       /*
-        * mb flush-b0 paired with worker-b1, to make sure either
-        * worker sees the above increment or we see done_seq update.
-        */
-       smp_mb__after_atomic_inc();
+       if (!list_empty(&work->node))
+               insert_kthread_work(worker, &fwork.work, work->node.next);
+       else if (worker->current_work == work)
+               insert_kthread_work(worker, &fwork.work, worker->work_list.next);
+       else
+               noop = true;
 
-       /* A - B <= 0 tests whether B is in front of A regardless of overflow */
-       wait_event(work->done, seq - work->done_seq <= 0);
-       atomic_dec(&work->flushing);
+       spin_unlock_irq(&worker->lock);
 
-       /*
-        * rmb flush-b1 paired with worker-b0, to make sure our caller
-        * sees every change made by work->func().
-        */
-       smp_mb__after_atomic_dec();
+       if (!noop)
+               wait_for_completion(&fwork.done);
 }
 EXPORT_SYMBOL_GPL(flush_kthread_work);