From: Ahbong Chang <cwahb...@google.com>

Without this forward declaration compile may fail if this header is
included only for registering other probe event without struct
pool_workqueue.

Link: http://lkml.kernel.org/r/20180416023626.139915-1-cwahb...@google.com

Reviewed-by: Todd Poynor <toddpoy...@google.com>
Signed-off-by: Ahbong Chang <cwahb...@google.com>
Signed-off-by: Steven Rostedt (VMware) <rost...@goodmis.org>
---
 include/trace/events/workqueue.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/trace/events/workqueue.h b/include/trace/events/workqueue.h
index 2f057a494d93..9a761bc6a251 100644
--- a/include/trace/events/workqueue.h
+++ b/include/trace/events/workqueue.h
@@ -25,6 +25,8 @@ DECLARE_EVENT_CLASS(workqueue_work,
        TP_printk("work struct %p", __entry->work)
 );
 
+struct pool_workqueue;
+
 /**
  * workqueue_queue_work - called when a work gets queued
  * @req_cpu:   the requested cpu
-- 
2.16.3


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