kthread_work: remove the unused wait_queue_head

The wait_queue_head_t kthread_work->done is unused since
flush_kthread_work() has been re-implemented.  Let's remove it
including the initialization code.  This makes
DEFINE_KTHREAD_WORK_ONSTACK() unnecessary, removed.

tj: Updated description.  Removed DEFINE_KTHREAD_WORK_ONSTACK().

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 2 insertions, 11 deletions

diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index 7dcef3317689..13d55206ccf6 100644
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h
@@ -73,7 +73,6 @@ struct kthread_worker {
 struct kthread_work {
         struct list_head        node;
         kthread_work_func_t     func;
-        wait_queue_head_t       done;
         struct kthread_worker   *worker;
 };
 
@@ -85,7 +84,6 @@ struct kthread_work {
 #define KTHREAD_WORK_INIT(work, fn)     {                               \
         .node = LIST_HEAD_INIT((work).node),                            \
         .func = (fn),                                                   \
-        .done = __WAIT_QUEUE_HEAD_INITIALIZER((work).done),             \
         }
 
 #define DEFINE_KTHREAD_WORKER(worker)                                   \
@@ -95,22 +93,16 @@ struct kthread_work {
         struct kthread_work work = KTHREAD_WORK_INIT(work, fn)
 
 /*
- * kthread_worker.lock and kthread_work.done need their own lockdep class
- * keys if they are defined on stack with lockdep enabled.  Use the
- * following macros when defining them on stack.
+ * kthread_worker.lock needs its own lockdep class key when defined on
+ * stack with lockdep enabled.  Use the following macros in such cases.
  */
 #ifdef CONFIG_LOCKDEP
 # define KTHREAD_WORKER_INIT_ONSTACK(worker)                            \
         ({ init_kthread_worker(&worker); worker; })
 # define DEFINE_KTHREAD_WORKER_ONSTACK(worker)                          \
         struct kthread_worker worker = KTHREAD_WORKER_INIT_ONSTACK(worker)
-# define KTHREAD_WORK_INIT_ONSTACK(work, fn)                            \
-        ({ init_kthread_work((&work), fn); work; })
-# define DEFINE_KTHREAD_WORK_ONSTACK(work, fn)                          \
-        struct kthread_work work = KTHREAD_WORK_INIT_ONSTACK(work, fn)
 #else
 # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) DEFINE_KTHREAD_WORKER(worker)
-# define DEFINE_KTHREAD_WORK_ONSTACK(work, fn) DEFINE_KTHREAD_WORK(work, fn)
 #endif
 
 extern void __init_kthread_worker(struct kthread_worker *worker,
@@ -127,7 +119,6 @@ extern void __init_kthread_worker(struct kthread_worker *worker,
                 memset((work), 0, sizeof(struct kthread_work));         \
                 INIT_LIST_HEAD(&(work)->node);                          \
                 (work)->func = (fn);                                    \
-                init_waitqueue_head(&(work)->done);                     \
         } while (0)
 
 int kthread_worker_fn(void *worker_ptr);