workqueues: schedule_on_each_cpu: use flush_work()

Change schedule_on_each_cpu() to use flush_work() instead of
flush_workqueue(), this way we don't wait for other work_struct's which
can be queued meanwhile.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Jarek Poplawski <jarkao2@gmail.com>
Cc: Max Krasnyansky <maxk@qualcomm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index ee41cf857d55..5fbffd302eb5 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -690,7 +690,8 @@ int schedule_on_each_cpu(work_func_t func)
                 set_bit(WORK_STRUCT_PENDING, work_data_bits(work));
                 __queue_work(per_cpu_ptr(keventd_wq->cpu_wq, cpu), work);
         }
-        flush_workqueue(keventd_wq);
+        for_each_online_cpu(cpu)
+                flush_work(per_cpu_ptr(works, cpu));
         put_online_cpus();
         free_percpu(works);
         return 0;