[PATCH] workqueue: fix schedule_on_each_cpu()

fix the schedule_on_each_cpu() implementation: __queue_work() is now
stricter, hence set the work-pending bit before passing in the new work.

(found in the -rt tree, using Peter Zijlstra's files-lock scalability
patchset)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 742cbbe49bdc..180a8ce11535 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -637,9 +637,11 @@ int schedule_on_each_cpu(work_func_t func)
 
         mutex_lock(&workqueue_mutex);
         for_each_online_cpu(cpu) {
-                INIT_WORK(per_cpu_ptr(works, cpu), func);
-                __queue_work(per_cpu_ptr(keventd_wq->cpu_wq, cpu),
-                                per_cpu_ptr(works, cpu));
+                struct work_struct *work = per_cpu_ptr(works, cpu);
+
+                INIT_WORK(work, func);
+                set_bit(WORK_STRUCT_PENDING, work_data_bits(work));
+                __queue_work(per_cpu_ptr(keventd_wq->cpu_wq, cpu), work);
         }
         mutex_unlock(&workqueue_mutex);
         flush_workqueue(keventd_wq);