[PATCH v2] workqueue: add function in event of workqueue_activate_work

[Kassey Li]

The trace event "workqueue_activate_work" only print work struct.
However, function is the region of interest in a full sequence of work.
Current workqueue_activate_work trace event output:

    workqueue_activate_work: work struct ffffff88b4a0f450

With this change, workqueue_activate_work will print the function name,
align with workqueue_queue_work/execute_start/execute_end event.

    workqueue_activate_work: work struct ffffff80413a78b8 function=vmstat_update

Signed-off-by: Kassey Li <quic_yingangl@xxxxxxxxxxx>
---
Changelog:
v1: https://lore.kernel.org/all/20240308010929.1955339-1-quic_yingangl@xxxxxxxxxxx/
v1->v2:
- do not follow checkpatch in TRACE_EVENT() macros
- add sample "workqueue_activate_work: work struct ffffff80413a78b8 function=vmstat_update"
---
 include/trace/events/workqueue.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/trace/events/workqueue.h b/include/trace/events/workqueue.h
index 262d52021c23..6ef5b7254070 100644
--- a/include/trace/events/workqueue.h
+++ b/include/trace/events/workqueue.h
@@ -64,13 +64,15 @@ TRACE_EVENT(workqueue_activate_work,
 
 	TP_STRUCT__entry(
 		__field( void *,	work	)
+		__field( void *,	function)
 	),
 
 	TP_fast_assign(
 		__entry->work		= work;
+		__entry->function	= work->func;
 	),
 
-	TP_printk("work struct %p", __entry->work)
+	TP_printk("work struct %p function=%ps ", __entry->work, __entry->function)
 );
 
 /**
-- 
2.25.1