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tracing: Add missing forward declaration
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-cwahbong@google.com Reviewed-by: Todd Poynor <toddpoynor@google.com> Signed-off-by: Ahbong Chang <cwahbong@google.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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@ -25,6 +25,8 @@ DECLARE_EVENT_CLASS(workqueue_work,
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TP_printk("work struct %p", __entry->work)
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);
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struct pool_workqueue;
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/**
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* workqueue_queue_work - called when a work gets queued
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* @req_cpu: the requested cpu
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